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TMP411ADGKTG4 [TI]

±1°C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction; 为± 1A ℃的远程和本地温度传感器，具有N -因子和串联电阻校正
TMP411ADGKTG4
型号： TMP411ADGKTG4
厂家： TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述：

±1°C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
为± 1A ℃的远程和本地温度传感器，具有N -因子和串联电阻校正

传感器 温度传感器
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TMP411  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
1°C Remote and Local TEMPERATURE SENSOR  
with N-Factor and Series Resistance Correction  
FD EATURES  
DESCRIPTION  
The TMP411 is a remote temperature sensor monitor with  
built-in local temperature sensor. The remote  
1°C REMOTE DIODE SENSOR  
a
D
D
D
D
D
D
D
D
1°C LOCAL TEMPERATURE SENSOR  
PROGRAMMABLE NON-IDEALITY FACTOR  
SERIES RESISTANCE CANCELLATION  
ALERT FUNCTION  
temperature sensor diode-connected transistors are  
typically low-cost, NPN- or PNP-type transistors or diodes  
that are an integral part of microcontrollers,  
microprocessors, or FPGAs.  
Remote accuracy is 1°C for multiple IC manufacturers,  
with no calibration needed. The Two-Wire serial interface  
accepts SMBus write byte, read byte, send byte, and  
receive byte commands to program the alarm thresholds  
and to read temperature data.  
PROGRAMMABLE RESOLUTION: 9 to 12 Bits  
PROGRAMMABLE THRESHOLD LIMITS  
TWO-WIRE/SMBusSERIAL INTERFACE  
MINIMUM AND MAXIMUM TEMPERATURE  
MONITORS  
Features that are included in the TMP411 are: series  
resistance cancellation, programmable non-ideality factor,  
programmable resolution, programmable threshold limits,  
minimum and maximum temperature monitors, wide  
remote temperature measurement range (up to +150°C),  
diode fault detection, and temperature alert function.  
D
D
D
MULTIPLE INTERFACE ADDRESSES  
ALERT/THERM2 PIN CONFIGURATION  
DIODE FAULT DETECTION  
The TMP411 is available in both MSOP-8 and SO-8  
packages.  
AD PPLICATIONS  
LCD/DLP/LCOS PROJECTORS  
SERVERS  
D
D
D
D
D
D
INDUSTRIAL CONTROLLERS  
CENTRAL OFFICE TELECOM EQUIPMENT  
DESKTOP AND NOTEBOOK COMPUTERS  
STORAGE AREA NETWORKS (SAN)  
4
V+  
THERM  
ALERT/THERM2  
TMP411  
1
5
6
V+  
GND  
Interrupt  
Configuration  
Consecutive Alert  
Configuration Register  
N−Factor  
Correction  
INDUSTRIAL AND MEDICAL  
EQUIPMENT  
Remote Temp High Limit  
Remote THERM Limit  
Remote Temp Low Limit  
THERM Hysteresis Register  
Local Temp High Limit  
Local THERM Limit  
One−Shot  
Register  
Status Register  
D
PROCESSOR/FPGA  
TEMPERATURE MONITORING  
Local  
Temperature  
Register  
T
L
Temperature  
Comparators  
Conversion Rate  
Register  
Local Temp Low Limit  
Local Temperature Min/Max Register  
Remote Temperature Min/Max Register  
Manufacturer ID Register  
Device ID Register  
D+  
2
3
T
R
Remote  
Temperature  
Register  
D−  
Configuration Register  
Resolution Register  
8
7
SCL  
SDA  
Bus Interface  
Pointer Register  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments  
semiconductor products and disclaimers thereto appears at the end of this data sheet.  
DLP is a registered trademark of Texas Instruments. SMBus is a trademark of Intel Corp.  
All other trademarks are the property of their respective owners.  
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎ ꢏꢐ ꢑꢊꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ  
ꢓ ꢍꢋ ꢌꢍꢎ ꢏ ꢑꢍ ꢒ ꢖꢕ ꢓ ꢊ ꢌꢊ ꢓ ꢐ ꢑꢊ ꢍꢋꢒ ꢖ ꢕꢎ ꢑꢛꢕ ꢑꢕ ꢎ ꢏꢒ ꢍꢌ ꢆꢕꢜ ꢐꢒ ꢇꢋꢒ ꢑꢎ ꢔꢏ ꢕꢋꢑ ꢒ ꢒꢑ ꢐꢋꢙ ꢐꢎ ꢙ ꢝ ꢐꢎ ꢎ ꢐ ꢋꢑꢞꢚ  
ꢀꢎ ꢍ ꢙꢔꢓ ꢑ ꢊꢍ ꢋ ꢖꢎ ꢍ ꢓ ꢕ ꢒ ꢒ ꢊꢋ ꢟ ꢙꢍ ꢕ ꢒ ꢋꢍꢑ ꢋꢕ ꢓꢕ ꢒꢒ ꢐꢎ ꢊꢘ ꢞ ꢊꢋꢓ ꢘꢔꢙ ꢕ ꢑꢕ ꢒꢑꢊ ꢋꢟ ꢍꢌ ꢐꢘ ꢘ ꢖꢐ ꢎ ꢐꢏ ꢕꢑꢕ ꢎ ꢒꢚ  
Copyright 2006−2008, Texas Instruments Incorporated  
www.ti.com  
ꢆ ꢠ ꢀꢡ ꢢꢢ  
www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
This integrated circuit can be damaged by ESD. Texas  
Instruments recommends that all integrated circuits be  
(1)  
ABSOLUTE MAXIMUM RATINGS  
handledwith appropriate precautions. Failure to observe  
Power Supply, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0V  
S
proper handling and installation procedures can cause damage.  
Input Voltage, pins 2, 3, 4 only . . . . . . . . . . . . . −0.5V to V + 0.5V  
S
Input Voltage, pins 6, 7, 8 only . . . . . . . . . . . . . . . . . . . −0.5V to 7V  
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA  
Operating Temperature Range . . . . . . . . . . . . . . . −55°C to +127°C  
Storage Temperature Range . . . . . . . . . . . . . . . . . −60°C to +130°C  
ESD damage can range from subtle performance degradation to  
complete device failure. Precision integrated circuits may be more  
susceptible to damage because very small parametric changes could  
cause the device not to meet its published specifications.  
Junction Temperature (T max) . . . . . . . . . . . . . . . . . . . . . . +150°C  
J
ESD Rating:  
Human Body Model (HBM) . . . . . . . . . . . . . . . . . . . . . . . 3000V  
Charged Device Model (CDM) . . . . . . . . . . . . . . . . . . . . 1000V  
Machine Model (MM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200V  
(1)  
Stresses above these ratings may cause permanent damage.  
Exposure to absolute maximum conditions for extended periods  
may degrade device reliability. These are stress ratings only, and  
functional operation of the device at these or any other conditions  
beyond those specified is not supported.  
(1)  
ORDERING INFORMATION  
PACKAGE  
DESIGNATOR  
PACKAGE  
MARKING  
2
PRODUCT  
DESCRIPTION  
I C ADDRESS  
PACKAGE-LEAD  
MSOP-8  
SO-8  
DGK  
D
411A  
T411A  
411B  
TMP411A  
Remote Junction Temperature Sensor  
100 1100  
100 1101  
100 1110  
MSOP-8  
SO-8  
DGK  
D
TMP411B  
TMP411C  
Remote Junction Temperature Sensor  
Remote Junction Temperature Sensor  
T411B  
411C  
MSOP-8  
SO-8  
DGK  
D
T411C  
(1)  
For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI web site  
at www.ti.com.  
PIN CONFIGURATION  
PIN ASSIGNMENTS  
Top View  
MSOP, SO  
PIN  
NAME  
DESCRIPTION  
1
V+  
Positive supply (2.7V to 5.5V)  
Positive connection to remote temperature  
sensor  
2
3
D+  
D−  
TMP411  
Negative connection to remote temperature  
sensor  
SCL  
SDA  
V+  
D+  
1
2
3
4
8
7
6
5
Thermal flag, active low, open-drain;  
requires pull-up resistor to V+  
4
5
THERM  
GND  
ALERT/THERM2  
GND  
Ground  
−
D
Alert (reconfigurable as second thermal  
flag), active low, open-drain; requires  
pull-up resistor to V+  
THERM  
6
ALERT/THERM2  
Serial data line for SMBus, open-drain;  
requires pull-up resistor to V+  
7
8
SDA  
SCL  
Serial clock line for SMBus, open-drain;  
requires pull-up resistor to V+  
2
ꢆꢠ ꢀ ꢡꢢꢢ  
www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
ELECTRICAL CHARACTERISTICS  
At T = −40°C to +125°C and V = 2.7V to 5.5V, unless otherwise noted.  
A
S
TMP411  
MIN  
TYP  
MAX  
PARAMETERS  
CONDITIONS  
UNITS  
TEMPERATURE ERROR  
Local Temperature Sensor  
TE  
TE  
T
= −40°C to +125°C  
1.25  
0.0625  
0.0625  
1
2.5  
1
°C  
°C  
°C  
°C  
°C  
LOCAL  
A
T
A
= +15°C to +85°C, V = 3.3V  
S
= +15°C to +75°C, T  
= −40°C to +100°C, T  
(1)  
Remote Temperature Sensor  
T
= −40°C to +150°C, V = 3.3V  
1
REMOTE  
A
DIODE  
S
T
A
= −40°C to +150°C, V = 3.3V  
3
DIODE  
S
T
A
= −40°C to +125°C, T  
= −40°C to +150°C  
3
5
DIODE  
vs Supply  
Local/Remote  
V
S
= 2.7V to 5.5V  
0.2  
0.5  
°C/V  
TEMPERATURE MEASUREMENT  
Conversion Time (per channel)  
Resolution  
One-Shot Mode  
105  
9
115  
125  
12  
ms  
Local Temperature Sensor (programmable)  
Remote Temperature Sensor  
Remote Sensor Source Currents  
High  
Bits  
Bits  
12  
Series Resistance 3kΩ Max  
120  
60  
µA  
µA  
µA  
µA  
Medium High  
Medium Low  
12  
Low  
6
Remote Transistor Ideality Factor  
η
TMP411 Optimized Ideality Factor  
1.008  
SMBus INTERFACE  
Logic Input High Voltage (SCL,  
SDA)  
V
IH  
2.1  
V
Logic Input Low Voltage (SCL, SDA)  
Hysteresis  
V
IL  
0.8  
+1  
V
mV  
mA  
µA  
500  
SMBus Output Low Sink Current  
Logic Input Current  
6
−1  
SMBus Input Capacitance (SCL, SDA)  
SMBus Clock Frequency  
SMBus Timeout  
3
pF  
3.4  
35  
1
MHz  
ms  
µs  
25  
30  
SCL Falling Edge to SDA Valid Time  
DIGITAL OUTPUTS  
Output Low Voltage  
V
I
I
= 6mA  
= V  
0.15  
0.1  
0.4  
1
V
OL  
OUT  
High-Level Output Leakage Current  
ALERT/THERM2 Output Low Sink Current  
THERM Output Low Sink Current  
V
µA  
mA  
mA  
OH  
OUT  
S
ALERT/THERM2 Forced to 0.4V  
THERM Forced to 0.4V  
6
6
POWER SUPPLY  
Specified Voltage Range  
Quiescent Current  
V
I
2.7  
5.5  
30  
V
µA  
µA  
µA  
µA  
µA  
V
S
0.0625 Conversions per Second, V = 3.3V  
S
Eight Conversions per Second, V = 3.3V  
S
28  
400  
3
Q
475  
10  
Serial Bus Inactive, Shutdown Mode  
Serial Bus Active, f = 400kHz, Shutdown Mode  
S
Serial Bus Active, f = 3.4MHz, Shutdown Mode  
S
90  
350  
2.4  
1.6  
Undervoltage Lock Out  
2.3  
2.6  
2.3  
Power-On Reset Threshold  
POR  
V
TEMPERATURE RANGE  
Specified Range  
−40  
−60  
+125  
+130  
°C  
°C  
Storage Range  
Thermal Resistance  
MSOP-8, SO-8  
150  
°C/W  
(1)  
Tested with less than 5Ω effective series resistance and 100pF differential input capacitance. T is the ambient temperature of the TMP411. T  
is the  
DIODE  
A
temperature at the remote diode sensor.  
3
ꢆ ꢠ ꢀꢡ ꢢꢢ  
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SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
TYPICAL CHARACTERISTICS  
At T = +25°C and V = 5.0V, unless otherwise noted.  
A
S
REMOTE TEMPERATURE ERROR  
vs TMP411 AMBIENT TEMPERATURE  
LOCAL TEMPERATURE ERROR  
vs TMP411 AMBIENT TEMPERATURE  
3
2
1
0
1
2
3
3.0  
2.0  
1.0  
0
VS = 3.3V  
50 Units Shown  
VS = 3.3V  
_
TDIODE = +25 C (temperature at remote diode)  
30 Typical Units Shown  
η
= 1.008  
−
−
−
−
1.0  
−
2.0  
−
3.0  
−
−
25  
50  
0
25  
50  
75  
100  
125  
−
−
25  
50  
0
25  
50  
75  
100  
125  
_
Ambient Temperature, TA ( C)  
_
Ambient Temperature, TA ( C)  
Figure 2.  
Figure 1.  
REMOTE TEMPERATURE ERROR  
vs LEAKAGE RESISTANCE  
REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE  
(Diode−Connected Transistor, 2N3906 PNP)  
60  
40  
20  
0
2.0  
1.5  
1.0  
0.5  
0
VS = 2.7V  
R −GND  
R −VS  
VS = 5.5V  
−
0.5  
−
1.0  
−
1.5  
−
2.0  
−
−
−
20  
40  
60  
(see Figure 11)  
0
5
10  
15  
20  
25  
30  
0
500  
1000  
1500  
RS  
2000  
2500  
3000  
3500  
Ω
Leakage Resistance (M  
)
(
)
Ω
Figure 3.  
Figure 4.  
REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE  
(GND Collector−Connected Transistor, 2N3906 PNP)  
REMOTE TEMPERATURE ERROR  
vs DIFFERENTIAL CAPACITANCE  
2.0  
1.5  
1.0  
0.5  
0
3
2
1
0
VS = 2.7V  
VS = 5.5V  
−
0.5  
−
1.0  
−
1.5  
−
2.0  
−
−
−
1
2
3
(see Figure 11)  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
0
500  
1000  
1500  
RS  
2000  
)
2500  
3000  
3500  
Capacitance (nF)  
(
Ω
Figure 5.  
Figure 6.  
4
ꢆꢠ ꢀ ꢡꢢꢢ  
www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
TYPICAL CHARACTERISTICS (continued)  
At T = +25°C and V = 5.0V, unless otherwise noted.  
A
S
TEMPERATURE ERROR  
vs POWER−SUPPLY NOISE FREQUENCY  
QUIESCENT CURRENT  
vs CONVERSION RATE  
25  
20  
15  
10  
5
500  
450  
400  
350  
300  
250  
200  
150  
100  
50  
Local 100mVPP Noise  
Remote 100mVPP Noise  
Local 250mVPP Noise  
Remote 250mVPP Noise  
VS = 5.5V  
0
−
5
−
−
−
−
10  
15  
20  
25  
VS = 2.7V  
0
0
5
10  
15  
0.0625 0.125 0.25  
0.5  
1
2
4
8
Frequency (MHz)  
Conversion Rate (conversions/sec)  
Figure 7.  
Figure 8.  
SHUTDOWN QUIESCENT CURRENT  
vs SUPPLY VOLTAGE  
SHUTDOWN QUIESCENT CURRENT  
vs SCL CLOCK FREQUENCY  
500  
450  
400  
350  
300  
250  
200  
150  
100  
50  
8
7
6
5
4
3
2
1
0
VS = 5.5V  
VS = 3.3V  
1M 10M  
0
1k  
10k  
100k  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
SCL CLock Frequency (Hz)  
VS (V)  
Figure 9.  
Figure 10.  
5
ꢆ ꢠ ꢀꢡ ꢢꢢ  
www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
temperatures. Additional thermal limits can be  
programmed into the TMP411 and used to trigger another  
flag (THERM) that can be used to initiate a system  
response to rising temperatures.  
APPLICATIONS INFORMATION  
The TMP411 is a dual-channel digital temperature sensor  
that combines a local die temperature measurement  
channel and a remote junction temperature measurement  
channel in a single MSOP-8 or SO-8 package. The  
TMP411 is Two-Wire- and SMBus interface-compatible  
and is specified over a temperature range of −40°C to  
+125°C. The TMP411 contains multiple registers for  
The TMP411 requires only a transistor connected between  
D+ and D− for proper remote temperature sensing  
operation. The SCL and SDA interface pins require pull-up  
resistors as part of the communication bus, while ALERT  
and THERM are open-drain outputs that also need pull−up  
resistors. ALERT and THERM may be shared with other  
devices if desired for a wired-OR implementation. A 0.1µF  
power-supply bypass capacitor is recommended for good  
local bypassing. Figure 11 shows a typical configuration  
for the TMP411.  
holding  
measurement  
configuration  
results,  
information,  
temperature  
temperature  
comparator  
maximum/minimum limits, and status information.  
User-programmed high and low temperature limits stored  
in the TMP411 can be used to trigger an over/under  
temperature alarm (ALERT) on local and remote  
+5V  
µ
0.1 F  
Ω
10k  
(typ)  
Ω
10k  
(typ)  
Ω
10k  
(typ)  
Ω
10k  
(typ)  
Transistor−connected configuration(1)  
:
1
Series Resistance  
V+  
8
(2)  
SCL  
SDA  
RS  
2
3
TMP411  
D+  
(3)  
7
(2)  
CDIFF  
SMBus  
Controller  
RS  
−
D
6
4
ALERT/THERM2  
THERM  
Fan Controller  
GND  
5
Diode−connected configuration(1)  
:
(2)  
RS  
(3)  
(1) Diode−connected configuration provides better settling time.  
NOTES:  
(2)  
CDIFF  
RS  
Transistor−connected configuration provides better series resistance cancellation.  
Ω
(2) RS (optional) should be < 1.5k in most applications. Selection of RS depends on  
specific application; see Filtering section.  
(3) CDIFF (optional) should be < 1000pF in most applications. Selection of CDIFF  
depends on specific application; see Filtering section and Figure 6, Remote  
Temperature Error vs Differential Capacitance.  
Figure 11. Basic Connections  
6
ꢆꢠ ꢀ ꢡꢢꢢ  
www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
for ambient local temperatures ranging from −40°C to  
+125°C. Parameters in the Absolute Maximum Ratings  
table must be observed.  
SERIES RESISTANCE CANCELLATION  
Series resistance in an application circuit that typically  
results from printed circuit board (PCB) trace resistance  
and remote line length (see Figure 11) is automatically  
cancelled by the TMP411, preventing what would  
otherwise result in a temperature offset.  
Table 1. Temperature Data Format  
(Local and Remote Temperature High Bytes)  
A total of up to 3kΩ of series line resistance is cancelled  
by the TMP411, eliminating the need for additional  
characterization and temperature offset correction.  
LOCAL/REMOTE TEMPERATURE REGISTER  
HIGH BYTE VALUE (+1°C RESOLUTION)  
STANDARD BINARY  
EXTENDED BINARY  
TEMP  
(°C)  
See the two Remote Temperature Error vs Series  
Resistance typical characteristics curves for details on the  
effect of series resistance and power-supply voltage on  
sensed remote temperature error.  
BINARY  
HEX  
00  
00  
00  
00  
01  
05  
0A  
19  
32  
4B  
64  
7D  
7F  
7F  
7F  
7F  
BINARY  
HEX  
00  
−64  
−50  
−25  
0
0000 0000  
0000 0000  
0000 0000  
0000 0000  
0000 0001  
0000 0101  
0000 1010  
0001 1001  
0011 0010  
0100 1011  
0110 0100  
0111 1101  
0111 1111  
0111 1111  
0111 1111  
0111 1111  
0000 0000  
0000 1110  
0010 0111  
0100 0000  
0100 0001  
0100 0101  
0100 1010  
0101 1001  
0111 0010  
1000 1011  
1010 0100  
1011 1101  
1011 1111  
1101 0110  
1110 1111  
1111 1111  
0E  
27  
DIFFERENTIAL INPUT CAPACITANCE  
40  
The TMP411 tolerates differential input capacitance of up  
to 1000pF with minimal change in temperature error. The  
effect of capacitance on sensed remote temperature error  
is illustrated in typical characteristic Remote Temperature  
Error vs Differential Capacitance. (Figure 6).  
1
41  
5
45  
10  
4A  
59  
25  
50  
72  
TEMPERATURE MEASUREMENT DATA  
75  
8B  
A4  
BD  
BF  
D6  
EF  
FF  
Temperature measurement data are taken over a default  
range of 0°C to +127°C for both local and remote locations.  
Measurements from −55°C to +150°C can be made both  
locally and remotely by reconfiguring the TMP411 for the  
extended temperature range. To change the TMP411  
configuration from the standard to the extended  
temperature range, switch bit 2 (RANGE) of the  
Configuration Register from low to high.  
100  
125  
127  
150  
175  
191  
Temperature data resulting from conversions within the  
default measurement range are represented in binary  
form, as shown in Table 1, Standard Binary column. Note  
that any temperature below 0°C results in a data value of  
zero (00h). Likewise, temperatures above +127°C result in  
a value of 127 (7Fh). The device can be set to measure  
over an extended temperature range by changing bit 2 of  
the Configuration Register from low to high. The change in  
measurement range and data format from standard binary  
to extended binary occurs at the next temperature  
conversion. For data captured in the extended  
temperature range configuration, an offset of 64 (40h) is  
added to the standard binary value, as shown in Table 1,  
Extended Binary column. This configuration allows  
measurement of temperatures below 0°C. Note that binary  
values corresponding to temperatures as low as −64°C,  
and as high as +191°C are possible; however, most  
temperature sensing diodes only measure with the range  
of −55°C to +150°C. Additionally, the TMP411 is rated only  
NOTE: Whenever changing between standard and  
extended temperature ranges, be aware that the  
temperatures stored in the temperature limit registers are  
NOT automatically reformatted to correspond to the new  
temperature range format. These temperature limit values  
must be reprogrammed in the appropriate binary or  
extended binary format.  
Both local and remote temperature data use two bytes for  
data storage. The high byte stores the temperature with  
1°C resolution. The second or low byte stores the decimal  
fraction value of the temperature and allows a higher  
measurement resolution; see Table 2. The measurement  
resolution for the remote channel is 0.0625°C, and is not  
adjustable. The measurement resolution for the local  
channel is adjustable; it can be set for 0.5°C, 0.25°C,  
0.125°C, or 0.0625°C by setting the RES1 and RES0 bits  
of the Resolution Register; see the Resolution Register  
section.  
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Table 2. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes)  
REMOTE TEMPERATURE  
REGISTER LOW BYTE  
VALUE  
LOCAL TEMPERATURE REGISTER LOW BYTE VALUE  
0.0625°C RESOLUTION  
0.5°C RESOLUTION  
0.25°C RESOLUTION  
0.125°C RESOLUTION  
0.0625°C RESOLUTION  
STANDARD  
STANDARD  
STANDARD  
STANDARD  
STANDARD  
AND EXTENDED  
AND EXTENDED  
AND EXTENDED  
AND EXTENDED  
AND EXTENDED  
TEMP  
BINARY  
BINARY  
BINARY  
BINARY  
BINARY  
HEX  
00  
10  
20  
30  
40  
50  
60  
70  
80  
90  
A0  
B0  
C0  
D0  
E0  
F0  
HEX  
00  
00  
00  
00  
00  
00  
00  
00  
80  
80  
80  
80  
80  
80  
80  
80  
HEX  
00  
00  
00  
00  
40  
40  
40  
40  
80  
80  
80  
80  
C0  
C0  
C0  
C0  
HEX  
00  
00  
20  
20  
40  
40  
60  
60  
80  
80  
A0  
A0  
C0  
C0  
E0  
E0  
HEX  
00  
10  
20  
30  
40  
50  
60  
70  
80  
90  
A0  
B0  
C0  
D0  
E0  
F0  
(°C)  
0.0000  
0.0625  
0.1250  
0.1875  
0.2500  
0.3125  
0.3750  
0.4375  
0.5000  
0.5625  
0.6250  
0.6875  
0.7500  
0.8125  
0.8750  
0.9375  
0000 0000  
0001 0000  
0010 0000  
0011 0000  
0100 0000  
0101 0000  
0110 0000  
0111 0000  
1000 0000  
1001 0000  
1010 0000  
1011 0000  
1100 0000  
1101 0000  
1110 0000  
1111 0000  
0000 0000  
0000 0000  
0000 0000  
0000 0000  
0000 0000  
0000 0000  
0000 0000  
0000 0000  
1000 0000  
1000 0000  
1000 0000  
1000 0000  
1000 0000  
1000 0000  
1000 0000  
1000 0000  
0000 0000  
0000 0000  
0000 0000  
0000 0000  
0100 0000  
0100 0000  
0100 0000  
0100 0000  
1000 0000  
1000 0000  
1000 0000  
1000 0000  
1100 0000  
1100 0000  
1100 0000  
1100 0000  
0000 0000  
0000 0000  
0010 0000  
0010 0000  
0100 0000  
0100 0000  
0110 0000  
0110 0000  
1000 0000  
1000 0000  
1010 0000  
1010 0000  
1100 0000  
1100 0000  
1110 0000  
1110 0000  
0000 0000  
0001 0000  
0010 0000  
0011 0000  
0100 0000  
0101 0000  
0110 0000  
0111 0000  
1000 0000  
1001 0000  
1010 0000  
1011 0000  
1100 0000  
1101 0000  
1110 0000  
1111 0000  
REGISTER INFORMATION  
The TMP411 contains multiple registers for holding  
configuration information, temperature measurement  
results, temperature comparator maximum/minimum,  
limits, and status information. These registers are  
described in Figure 12 and Table 3.  
Pointer Register  
Local and Remote Temperature Registers  
Local and Remote Limit Registers  
THERM Hysteresis Register  
Status Register  
SDA  
SCL  
POINTER REGISTER  
I/O  
Control  
Interface  
Configuration Register  
Figure 12 shows the internal register structure of the  
TMP411. The 8-bit Pointer Register is used to address a  
given data register. The Pointer Register identifies which  
of the data registers should respond to a read or write  
command on the Two-Wire bus. This register is set with  
every write command. A write command must be issued  
to set the proper value in the Pointer Register before  
executing a read command. Table 3 describes the pointer  
address of the registers available in the TMP411. The  
power-on reset (POR) value of the Pointer Register is 00h  
(0000 0000b).  
Resolution Register  
Conversion Rate Register  
One−Shot Register  
Consecutive Alert Register  
Identification Registers  
Local Temperature Min/Max  
Remote Temperature Min/Max  
Figure 12. Internal Register Structure  
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Table 3. Register Map  
POINTER  
ADDRESS (HEX)  
POWER-ON  
RESET  
BIT DESCRIPTIONS  
READ  
WRITE  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
(HEX)  
REGISTER DESCRIPTIONS  
(1)  
00  
NA  
00  
00  
LT11  
LT10  
LT9  
LT8  
LT7  
LT6  
LT5  
LT4  
Local Temperature (High Byte)  
Remote Temperature  
(High Byte)  
01  
NA  
RT11  
RT10  
RT9  
RT8  
RT7  
RT6  
RT5  
RT4  
02  
03  
04  
NA  
09  
XX  
00  
08  
BUSY  
MASK1  
0
LHIGH  
SD  
LLOW  
AL/TH  
0
RHIGH  
RLOW  
0
OPEN  
RANGE  
R2  
RTHRM LTHRM  
Status Register  
0
0
0
0
Configuration Register  
Conversion Rate Register  
0A  
0
R3  
R1  
R0  
Local Temperature High Limit  
(High Byte)  
05  
06  
07  
0B  
0C  
0D  
55  
00  
55  
LTH11  
LTL11  
RTH11  
RTL11  
LTH10  
LTL10  
RTH10  
LTH9  
LTL9  
RTH9  
LTH8  
LTL8  
RTH8  
LTH7  
LTL7  
RTH7  
LTH6  
LTL6  
RTH6  
LTH5  
LTL5  
RTH5  
LTH4  
LTL4  
RTH4  
Local Temperature Low Limit  
(High Byte)  
Remote Temperature  
High Limit (High Byte)  
Remote Temperature  
Low Limit (High Byte)  
08  
NA  
10  
0E  
0F  
00  
XX  
00  
RTL10  
X
RTL9  
X
RTL8  
X
RTL7  
RTL6  
RTL5  
RTL4  
(2)  
X
X
0
X
0
X
0
X
0
One-Shot Start  
Remote Temperature  
(Low Byte)  
NA  
RT3  
RT2  
RT1  
RT0  
Remote Temperature  
High Limit (Low Byte)  
13  
13  
00  
RTH3  
RTH2  
RTH1  
RTH0  
0
0
0
0
Remote Temperature  
Low Limit (Low Byte)  
14  
15  
16  
14  
NA  
16  
00  
00  
00  
RTL3  
LT3  
RTL2  
LT2  
RTL1  
LT1  
RTL0  
LT0  
0
0
0
0
0
0
0
0
0
0
0
0
Local Temperature (Low Byte)  
Local Temperature High Limit  
(Low Byte)  
LTH3  
LTH2  
LTH1  
LTH0  
Local Temperature Low Limit  
(Low Byte)  
17  
17  
00  
LTL3  
LTL2  
LTL1  
LTL0  
0
0
0
0
18  
19  
1A  
20  
21  
22  
18  
19  
1A  
20  
21  
22  
00  
55  
1C  
55  
0A  
81  
NC7  
RTHL11  
0
NC6  
RTHL10  
0
NC5  
RTHL9  
0
NC4  
RTHL8  
1
NC3  
RTHL7  
1
NC2  
RTHL6  
1
NC1  
RTHL5  
RES1  
LTHL5  
TH5  
NC0  
RTHL4  
RES0  
LTHL4  
TH4  
N-factor Correction  
Remote THERM Limit  
Resolution Register  
LTHL11  
TH11  
LTHL10  
TH10  
0
LTHL9  
TH9  
0
LTHL8  
TH8  
0
LTHL7  
TH7  
C2  
LTHL6  
TH6  
C1  
Local THERM Limit  
THERM Hysteresis  
TO_EN  
C0  
0
Consecutive Alert Register  
Local Temperature Minimum  
(High Byte)  
30  
31  
32  
33  
34  
35  
36  
37  
30  
31  
32  
33  
34  
35  
36  
37  
FF  
F0  
00  
00  
FF  
F0  
00  
00  
LMT11  
LMT3  
LXT11  
LXT3  
LMT10  
LMT2  
LMT9  
LMT1  
LXT9  
LXT1  
RMT9  
RMT1  
RXT9  
RXT1  
LMT8  
LMT0  
LXT8  
LXT0  
RMT8  
RMT0  
RXT8  
RXT0  
LMT7  
0
LMT6  
0
LMT5  
0
LMT4  
0
Local Temperature Minimum  
(Low Byte)  
Local Temperature Maximum  
(High Byte)  
LXT10  
LXT2  
LXT7  
0
LXT6  
0
LXT5  
0
LXT4  
0
Local Temperature Maximum  
(Low Byte)  
Remote Temperature Minimum  
(High Byte)  
RMT11  
RMT3  
RXT11  
RXT3  
RMT10  
RMT2  
RXT10  
RXT2  
RMT7  
0
RMT6  
0
RMT5  
0
RMT4  
0
Remote Temperature Minimum  
(Low Byte)  
Remote Temperature  
Maximum (High Byte)  
RXT7  
0
RXT6  
0
RXT5  
0
RXT4  
0
Remote Temperature  
Maximum (Low Byte)  
(2)  
X
NA  
FE  
FF  
FF  
FF  
FC  
NA  
NA  
NA  
NA  
XX  
55  
12  
13  
10  
X
1
0
0
0
X
0
0
0
0
X
1
1
1
1
X
0
0
0
0
X
1
0
0
0
X
0
1
1
0
X
1
0
1
0
Software Reset  
Manufacturer ID  
0
0
0
0
Device ID for TMP411A  
Device ID for TMP411B  
Device ID for TMP411C  
(1)  
(2)  
NA = not applicable; register is write- or read-only.  
X = indeterminate state.  
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temperature low limit is read by reading the high byte from  
pointer address 06h and the low byte from pointer address  
17h, or by using a two-byte read from pointer address 06h.  
The power-on reset value of the local temperature low limit  
register is 00h/00h (0°C in standard temperature mode;  
−64°C in extended mode).  
TEMPERATURE REGISTERS  
The TMP411 has four 8-bit registers that hold temperature  
measurement results. Both the local channel and the  
remote channel have a high byte register that contains the  
most significant bits (MSBs) of the temperature  
analog-to-digital converter (ADC) result and a low byte  
register that contains the least significant bits (LSBs) of the  
temperature ADC result. The local channel high byte  
address is 00h; the local channel low byte address is 15h.  
The remote channel high byte is at address 01h; the  
remote channel low byte address is 10h. These registers  
are read-only and are updated by the ADC each time a  
temperature measurement is completed.  
The remote temperature high limit is set by writing the high  
byte to pointer address 0Dh and writing the low byte to  
pointer address 13h, or by using a two-byte write  
command to pointer address 0Dh. The remote  
temperature high limit is obtained by reading the high byte  
from pointer address 07h and the low byte from pointer  
address 13h, or by using a two-byte read command from  
pointer address 07h. The power-on reset value of the  
Remote Temperature High Limit Register is 55h/00h  
(+85°C in standard temperature mode; +21°C in extended  
temperature mode).  
The TMP411 contains circuitry to assure that a low byte  
register read command returns data from the same ADC  
conversion as the immediately preceding high byte read  
command. This assurance remains valid only until another  
register is read. For proper operation, the high byte of a  
temperature register should be read first. The low byte  
register should be read in the next read command. The low  
byte register may be left unread if the LSBs are not  
needed. Alternatively, the temperature registers may be  
read as a 16-bit register by using a single two-byte read  
command from address 00h for the local channel result or  
from address 01h for the remote channel result. The high  
byte will be output first, followed by the low byte. Both bytes  
of this read operation will be from the same ADC  
conversion. The power-on reset value of both temperature  
registers is 00h.  
The remote temperature low limit is set by writing the high  
byte to pointer address 0Eh and writing the low byte to  
pointer address 14h, or by using a two-byte write to pointer  
address 0Eh. The remote temperature low limit is read by  
reading the high byte from pointer address 08h and the low  
byte from pointer address 14h, or by using a two-byte read  
from pointer address 08h. The power-on reset value of the  
Remote Temperature Low Limit Register is 00h/00h (0°C  
in standard temperature mode; −64°C in extended mode).  
The TMP411 also has a THERM limit register for both the  
local and the remote channels. These registers are eight  
bits and allow for THERM limits set to 1°C resolution. The  
local channel THERM limit is set by writing to pointer  
address 20h. The remote channel THERM limit is set by  
writing to pointer address 19h. The local channel THERM  
limit is obtained by reading from pointer address 20h; the  
remote channel THERM limit is read by reading from  
pointer address 19h. The power-on reset value of the  
THERM limit registers is 55h (+85°C in standard  
temperature mode; +21°C in extended temperature  
mode). The THERM limit comparators also have  
hysteresis. The hysteresis of both comparators is set by  
writing to pointer address 21h. The hysteresis value is  
obtained by reading from pointer address 21h. The value  
in the Hysteresis Register is an unsigned number (always  
positive). The power-on reset value of this register is 0Ah  
(+10°C).  
LIMIT REGISTERS  
The TMP411 has 11 registers for setting comparator limits  
for both the local and remote measurement channels.  
These registers have read and write capability. The High  
and Low Limit Registers for both channels span two  
registers, as do the temperature registers. The local  
temperature high limit is set by writing the high byte to  
pointer address 0Bh and writing the low byte to pointer  
address 16h, or by using a single two-byte write command  
(high byte first) to pointer address 0Bh. The local  
temperature high limit is obtained by reading the high byte  
from pointer address 05h and the low byte from pointer  
address 16h or by using a two-byte read command from  
pointer address 05h. The power-on reset value of the local  
temperature high limit is 55h/00h. The power-on reset  
value of the local temperature high limit is 55h/00h (+85°C  
in standard temperature mode; +21°C in extended  
temperature mode).  
Whenever changing between standard and extended  
temperature ranges, be aware that the temperatures  
stored in the temperature limit registers are NOT  
automatically reformatted to correspond to the new  
temperature range format. These values must be  
reprogrammed in the appropriate binary or extended  
binary format.  
Similarly, the local temperature low limit is set by writing  
the high byte to pointer address 0Ch and writing the low  
byte to pointer address 17h, or by using a single two-byte  
write command to pointer address 0Ch. The local  
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The RHIGH bit reads as ‘1’ if the remote temperature has  
exceeded the remote high limit and remains greater than  
the remote high limit less the value in the Hysteresis  
Register.  
STATUS REGISTER  
The TMP411 has a Status Register to report the state of  
the temperature comparators. Table 4 shows the Status  
Register bits. The Status Register is read-only and is read  
by reading from pointer address 02h.  
The LLOW and RLOW bits are not affected by the AL/TH  
bit. The LLOW bit reads as ‘1’ if the local low limit was  
exceeded since the last clearing of the Status Register.  
The RLOW bit reads as ‘1’ if the remote low limit was  
exceeded since the last clearing of the Status Register.  
The BUSY bit reads as ‘1’ if the ADC is making a  
conversion. It reads as ‘0’ if the ADC is not converting.  
The OPEN bit reads as ‘1’ if the remote transistor was  
detected as open since the last read of the Status Register.  
The OPEN status is only detected when the ADC is  
attempting to convert a remote temperature.  
The values of the LLOW, RLOW, and OPEN (as well as  
LHIGH and RHIGH when AL/TH is ‘0’) are latched and will  
read as ‘1’ until the Status Register is read or a device reset  
occurs. These bits are cleared by reading the Status  
Register, provided that the condition causing the flag to be  
set no longer exists. The values of BUSY, LTHRM, and  
RTHRM (as well as LHIGH and RHIGH when  
ALERT/THERM2 is ‘1’) are not latched and are not cleared  
by reading the Status Register. They always indicate the  
current state, and are updated appropriately at the end of  
the corresponding ADC conversion. Clearing the Status  
Register bits does not clear the state of the ALERT pin; an  
SMBus alert response address command must be used to  
clear the ALERT pin.  
The RTHRM bit reads as ‘1’ if the remote temperature has  
exceeded the remote THERM limit and remains greater  
than the remote THERM limit less the value in the shared  
Hysteresis Register; see Figure 18.  
The LTHRM bit reads as ‘1’ if the local temperature has  
exceeded the local THERM limit and remains greater than  
the local THERM limit less the value in the shared  
Hysteresis Register; see Figure 18.  
The LHIGH and RHIGH bit values depend on the state of  
the AL/TH bit in the Configuration Register. If the AL/TH bit  
is ‘0’, the LHIGH bit reads as ‘1’ if the local high limit was  
exceeded since the last clearing of the Status Register.  
The RHIGH bit reads as ‘1’ if the remote high limit was  
exceeded since the last clearing of the Status Register. If  
the AL/TH bit is ‘1’, the remote high limit and the local high  
limit are used to implement a THERM2 function. LHIGH  
reads as ‘1’ if the local temperature has exceeded the local  
high limit and remains greater than the local high limit less  
the value in the Hysteresis Register.  
The TMP411 NORs LHIGH, LLOW, RHIGH, RLOW, and  
OPEN, so a status change for any of these flags from ‘0’  
to ‘1’ automatically causes the ALERT pin to go low (only  
applies when the ALERT/THERM2 pin is configured for  
ALERT mode).  
Table 4. Status Register Format  
STATUS REGISTER (Read = 02h, Write = NA)  
BIT #  
BIT NAME  
D7  
D6  
LHIGH  
0
D5  
LLOW  
0
D4  
RHIGH  
0
D3  
RLOW  
0
D2  
OPEN  
0
D1  
RTHRM  
0
D0  
LTHRM  
0
BUSY  
(1)  
0
POR VALUE  
(1)  
The BUSY bit will change to ‘1’ almost immediately (<< 100µs) following power-up, as the TMP411 begins the first temperature conversion. It will be high whenever  
the TMP411 is converting a temperature reading.  
11  
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the ALERT pin goes low after the set number of  
consecutive out-of-limit temperature measurements  
occur.  
CONFIGURATION REGISTER  
The Configuration Register sets the temperature range,  
controls shutdown mode, and determines how the  
ALERT/THERM2 pin functions. The Configuration  
Register is set by writing to pointer address 09h and read  
by reading from pointer address 03h.  
If AL/TH = 1, the ALERT/THERM2 pin implements a  
THERM function (THERM2). In this mode, THERM2  
functions similar to the THERM pin except that the local  
high limit and remote high limit registers are used for the  
thresholds. THERM2 goes low when either RHIGH or  
LHIGH is set.  
The MASK bit (bit 7) enables or disables the ALERT pin  
output if AL/TH = 0. If AL/TH = 1 then the MASK bit has no  
effect. If MASK is set to ‘0’, the ALERT pin goes low when  
one of the temperature measurement channels exceeds  
its high or low limits for the chosen number of consecutive  
conversions. If the MASK bit is set to ‘1’, the TMP411  
retains the ALERT pin status, but the ALERT pin will not  
go low.  
The temperature range is set by configuring bit 2 of the  
Configuration Register. Setting this bit low configures the  
TMP411 for the standard measurement range (0°C to  
+127°C); temperature conversions will be stored in the  
standard binary format. Setting bit 2 high configures the  
TMP411 for the extended measurement range (−55°C to  
+150°C); temperature conversions will be stored in the  
extended binary format (see Table 1).  
The shutdown (SD) bit (bit 6) enables or disables the  
temperature measurement circuitry. If SD = 0, the TMP411  
converts continuously at the rate set in the conversion rate  
register. When SD is set to ‘1’, the TMP411 immediately  
stops converting and enters a shutdown mode. When SD  
is set to ‘0’ again, the TMP411 resumes continuous  
conversions. A single conversion can be started when  
SD = 1 by writing to the One-Shot Register.  
The remaining bits of the Configuration Register are  
reserved and must always be set to ‘0’. The power-on reset  
value for this register is 00h. Table 5 summarizes the bits  
of the Configuration Register.  
The AL/TH bit (bit 5) controls whether the ALERT pin  
functions in ALERT mode or THERM2 mode. If AL/TH = 0,  
the ALERT pin operates as an interrupt pin. In this mode,  
Table 5. Configuration Register Bit Descriptions  
CONFIGURATION REGISTER (Read = 03h, Write = 09h, POR = 00h)  
BIT  
NAME  
FUNCTION  
POWER-ON RESET VALUE  
0 = ALERT Enabled  
1 = ALERT Masked  
7
MASK  
0
0 = Run  
1 = Shut Down  
6
SD  
0
0 = ALERT Mode  
1 = THERM Mode  
5
AL/TH  
Reserved  
0
0
0
0
4, 3  
2
—
0 = 0°C to +127°C  
1 = −55°C to +150°C  
Temperature Range  
Reserved  
1, 0  
—
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conversion timing itself, thereby allowing the TMP411  
power dissipation to be balanced with the temperature  
register update rate. Table 7 shows the conversion rate  
options and corresponding current consumption.  
RESOLUTION REGISTER  
The RES1 and RES0 bits (resolution bits 1 and 0) of the  
Resolution Register set the resolution of the local  
temperature measurement channel. Remote temperature  
measurement channel resolution is not affected.  
Changing the local channel resolution also affects the  
conversion time and rate of the TMP411. The Resolution  
Register is set by writing to pointer address 1Ah and is  
read by reading from pointer address 1Ah. Table 6 shows  
the resolution bits for the Resolution Register.  
ONE-SHOT CONVERSION  
When the TMP411 is in shutdown mode (SD = 1 in the  
Configuration Register), a single conversion on both  
channels is started by writing any value to the One-Shot  
Start Register, pointer address 0Fh. This write operation  
starts one conversion; the TMP411 returns to shutdown  
mode when that conversion completes. The value of the  
data sent in the write command is irrelevant and is not  
stored by the TMP411. When the TMP411 is in shutdown  
mode, an initial 200µs is required before a one-shot  
command can be given. (Note: When a shutdown  
command is issued, the TMP411 completes the current  
conversion before shutting down.) This wait time only  
applies to the 200µs immediately following shutdown.  
One-shot commands can be issued without delay  
thereafter.  
Table 6. Resolution Register:  
Local Channel Programmable Resolution  
RESOLUTION REGISTER (Read = 1Ah, Write = 1Ah, POR = 1Ch)  
CONVERSION TIME  
RES1  
RES0  
RESOLUTION  
(Typical)  
12.5ms  
25ms  
0
0
1
1
0
1
0
1
9 Bits (0.5°C)  
10 Bits (0.25°C)  
11 Bits (0.125°C)  
12 Bits (0.0625°C)  
50ms  
100ms  
Bits 2 through 4 of the Resolution Register must always be  
set to ‘1’. Bits 5 through 7 of the Resolution Register must  
always be set to ‘0’. The power-on reset value of this  
register is 1Ch.  
CONVERSION RATE REGISTER  
The Conversion Rate Register controls the rate at which  
temperature conversions are performed. This register  
adjusts the idle time between conversions but not the  
Table 7. Conversion Rate Register  
CONVERSION RATE REGISTER (Read = 04h, Write = 0Ah, POR = 08h)  
AVERAGE I (TYP)  
Q
(µA)  
V
= 2.7V  
11  
V
= 5.5V  
32  
R7  
0
R6  
0
R5  
0
R4  
0
R3  
0
R2  
0
R1  
0
R0  
0
CONVERSION/SEC  
S
S
0.0625  
0
0
0
0
0
0
0
1
0.125  
17  
38  
0
0
0
0
0
0
1
0
0.25  
0.5  
1
28  
49  
0
0
0
0
0
0
1
1
47  
69  
0
0
0
0
0
1
0
0
80  
103  
155  
220  
413  
0
0
0
0
0
1
0
1
2
128  
190  
373  
0
0
0
0
0
1
1
0
4
07h to 0Fh  
8
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N-FACTOR CORRECTION REGISTER  
MINIMUM AND MAXIMUM REGISTERS  
The TMP411 allows for a different n-factor value to be used  
for converting remote channel measurements to  
temperature. The remote channel uses sequential current  
The TMP411 stores the minimum and maximum  
temperature measured since power-on, chip-reset, or  
minimum and maximum register reset for both the local  
and remote channels. The Local Temperature Minimum  
Register may be read by reading the high byte from pointer  
address 30h and the low byte from pointer address 31h.  
The Local Temperature Minimum Register may also be  
read by using a two-byte read command from pointer  
address 30h. The Local Temperature Minimum Register is  
reset at power-on, by executing the chip-reset command,  
or by writing any value to any of pointer addresses 30h  
through 37h. The reset value for these registers is  
FFh/F0h.  
excitation to extract  
a
differential VBE voltage  
measurement to determine the temperature of the remote  
transistor. Equation 1 relates this voltage and temperature.  
I2  
lnǒ Ǔ  
I1  
nkT  
q
VBE2 * VBE1  
+
(1)  
The value n in Equation 1 is a characteristic of the  
particular transistor used for the remote channel. The  
default value for the TMP411 is n = 1.008. The value in the  
N-Factor Correction Register may be used to adjust the  
effective n-factor according to Equation 2 and Equation 3.  
The Local Temperature Maximum Register may be read  
by reading the high byte from pointer address 32h and the  
low byte from pointer address 33h. The Local Temperature  
Maximum Register may also be read by using a two-byte  
read command from pointer address 32h. The Local  
Temperature Maximum Register is reset at power-on by  
executing the chip reset command, or by writing any value  
to any of pointer addresses 30h through 37h. The reset  
value for these registers is 00h/00h.  
1.008 @300  
+
neff  
ǒ
Ǔ
300*NADJUST  
(2)  
(3)  
300 @1.008  
+ 300*ǒ  
Ǔ
NADJUST  
neff  
The n-correction value must be stored in  
two’s-complement format, yielding an effective data range  
from −128 to +127, as shown in Table 8. The n-correction  
value may be written to and read from pointer address 18h.  
The register power-on reset value is 00h, thus having no  
effect unless written to.  
The Remote Temperature Minimum Register may be read  
by reading the high byte from pointer address 34h and the  
low byte from pointer address 35h. The Remote  
Temperature Minimum Register may also be read by using  
a two-byte read command from pointer address 34h. The  
Remote Temperature Minimum Register is reset at  
power-on by executing the chip reset command, or by  
writing any value to any of pointer addresses 30h through  
37h. The reset value for these registers is FFh/F0h.  
Table 8. N-Factor Range  
N
ADJUST  
The Remote Temperature Maximum Register may be read  
by reading the high byte from pointer address 36h and the  
low byte from pointer address 37h. The Remote  
Temperature Maximum Register may also be read by  
using a two-byte read command from pointer address 36h.  
The Remote Temperature Maximum Register is reset at  
power-on by executing the chip reset command, or by  
writing any value to any of pointer addresses 30h through  
37h. The reset value for these registers is 00h/00h.  
BINARY  
01111111  
00001010  
00001000  
00000110  
00000100  
00000010  
00000001  
00000000  
11111111  
11111110  
11111100  
11111010  
11111000  
11110110  
10000000  
HEX  
DECIMAL  
N
7F  
0A  
08  
06  
04  
02  
01  
00  
FF  
FE  
FC  
FA  
F8  
F6  
80  
127  
10  
8
1.747977  
1.042759  
1.035616  
1.028571  
1.021622  
1.014765  
1.011371  
1.008  
6
4
2
1
0
−1  
−2  
−4  
−6  
−8  
−10  
−128  
1.004651  
1.001325  
0.994737  
0.988235  
0.981818  
0.975484  
0.706542  
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are shown in Table 10. The default hysteresis value is  
10°C, whether the device is operating in the standard or  
extended mode setting.  
SOFTWARE RESET  
The TMP411 may be reset by writing any value to Pointer  
Register FCh. This restores the power-on reset state to all  
of the TMP411 registers as well as abort any conversion  
in process and clear the ALERT and THERM pins.  
Table 10. Allowable THERM Hysteresis Values  
THERM HYSTERESIS VALUE  
The TMP411 also supports reset via the two-wire general  
call address (00000000). The TMP411 acknowledges the  
general call address and responds to the second byte. If  
the second byte is 00000110, the TMP411 executes a  
software reset. The TMP411 takes no action in response  
to other values in the second byte.  
TH[11:4]  
TEMPERATURE  
(STANDARD BINARY)  
(HEX)  
00  
(°C)  
0
0000 0000  
0000 0001  
0000 0101  
0000 1010  
0001 1001  
0011 0010  
0100 1011  
0110 0100  
0111 1101  
0111 1111  
1001 0110  
1010 1111  
1100 1000  
1110 0001  
1111 1111  
1
01  
5
05  
10  
0A  
19  
25  
CONSECUTIVE ALERT REGISTER  
50  
32  
The value in the Consecutive Alert Register (address 22h)  
determines how many consecutive out-of-limit  
measurements must occur on a measurement channel  
before the ALERT signal is activated. The value in this  
register does not affect bits in the Status Register. Values  
of one, two, three, or four consecutive conversions can be  
selected; one conversion is the default. This function  
allows additional filtering for the ALERT pin. The  
consecutive alert bits are shown in Table 9.  
75  
4B  
64  
100  
125  
127  
150  
175  
200  
225  
255  
7D  
7F  
96  
AF  
C8  
E1  
FF  
Table 9. Consecutive Alert Register  
CONSECUTIVE ALERT REGISTER  
(READ = 22h, WRITE = 22h, POR = 01h)  
BUS OVERVIEW  
NUMBER OF CONSECUTIVE  
The TMP411 is SMBus interface-compatible. In SMBus  
protocol, the device that initiates the transfer is called a  
master, and the devices controlled by the master are  
slaves. The bus must be controlled by a master device that  
generates the serial clock (SCL), controls the bus access,  
and generates the START and STOP conditions.  
OUT-OF-LIMIT MEASUREMENTS  
C2  
0
C1  
0
C0  
0
1
2
3
4
0
0
1
0
1
1
1
1
1
To address a specific device, a START condition is  
initiated. START is indicated by pulling the data line (SDA)  
from a high to low logic level while SCL is high. All slaves  
on the bus shift in the slave address byte, with the last bit  
indicating whether a read or write operation is intended.  
During the ninth clock pulse, the slave being addressed  
responds to the master by generating an Acknowledge  
and pulling SDA low.  
NOTE: Bit 7 of the Consecutive Alert Register controls the  
enable/disable of the timeout function. See the Timeout  
Function section for a description of this feature.  
THERM HYSTERESIS REGISTER  
The THERM Hysteresis Register, shown in Table 11,  
stores the hysteresis value used for the THERM pin alarm  
function. This register must be programmed with a value  
that is less than the Local Temperature High Limit Register  
value, Remote Temperature High Limit Register value,  
Local THERM Limit Register value, or Remote THERM  
Limit Register value; otherwise, the respective  
temperature comparator will not trip on the measured  
temperature falling edges. Allowable hysteresis values  
Data transfer is then initiated and sent over eight clock  
pulses followed by an Acknowledge bit. During data  
transfer SDA must remain stable while SCL is high,  
because any change in SDA while SCL is high is  
interpreted as a control signal.  
Once all data has been transferred, the master generates  
a STOP condition. STOP is indicated by pulling SDA from  
low to high, while SCL is high.  
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SERIAL INTERFACE  
READ/WRITE OPERATIONS  
The TMP411 operates only as a slave device on either the  
Two-Wire bus or the SMBus. Connections to either bus are  
made via the open-drain I/O lines, SDA and SCL. The SDA  
and SCL pins feature integrated spike suppression filters  
and Schmitt triggers to minimize the effects of input spikes  
and bus noise. The TMP411 supports the transmission  
protocol for fast (1kHz to 400kHz) and high-speed (1kHz  
to 3.4MHz) modes. All data bytes are transmitted MSB  
first.  
Accessing a particular register on the TMP411 is  
accomplished by writing the appropriate value to the  
Pointer Register. The value for the Pointer Register is the  
first byte transferred after the slave address byte with the  
R/W bit low. Every write operation to the TMP411 requires  
a value for the Pointer Register (see Figure 14).  
When reading from the TMP411, the last value stored in  
the Pointer Register by a write operation is used to  
determine which register is read by a read operation. To  
change the register pointer for a read operation, a new  
value must be written to the Pointer Register. This  
transaction is accomplished by issuing a slave address  
byte with the R/W bit low, followed by the Pointer Register  
byte. No additional data are required. The master can then  
generate a START condition and send the slave address  
byte with the R/W bit high to initiate the read command.  
See Figure 15 for details of this sequence. If repeated  
reads from the same register are desired, it is not  
necessary to continually send the Pointer Register bytes,  
because the TMP411 retains the Pointer Register value  
until it is changed by the next write operation. Note that  
register bytes are sent MSB first, followed by the LSB.  
SERIAL BUS ADDRESS  
To communicate with the TMP411, the master must first  
address slave devices via a slave address byte. The slave  
address byte consists of seven address bits, and a  
direction bit indicating the intent of executing a read or  
write operation.  
The address of the TMP411A is 4Ch (1001100b). The  
address of the TMP411B is 4Dh (1001101b). The address  
of the TMP411C is 4Eh (1001110b).  
Table 11. THERM Hysteresis Register Format  
THERM HYSTERESIS REGISTER (Read = 21h, Write = 21h, POR = 0Ah)  
BIT #  
BIT NAME  
D7  
TH11  
0
D6  
TH10  
0
D5  
TH9  
0
D4  
TH8  
0
D3  
TH7  
1
D2  
TH6  
0
D1  
TH5  
1
D0  
TH4  
0
POR VALUE  
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Data Transfer: The number of data bytes transferred  
between a START and a STOP condition is not limited and  
is determined by the master device. The receiver  
acknowledges the transfer of data.  
TIMING DIAGRAMS  
The TMP411 is Two-Wire and SMBus-compatible.  
Figure 13 to Figure 17 describe the various operations on  
the TMP411. Bus definitions are given below. Parameters  
for Figure 13 are defined in Table 12.  
Acknowledge: Each receiving device, when addressed,  
is obliged to generate an Acknowledge bit. A device that  
acknowledges must pull down the SDA line during the  
Acknowledge clock pulse in such a way that the SDA line  
is stable low during the high period of the Acknowledge  
clock pulse. Setup and hold times must be taken into  
account. On a master receive, data transfer termination  
Bus Idle: Both SDA and SCL lines remain high.  
Start Data Transfer: A change in the state of the SDA line,  
from high to low, while the SCL line is high, defines a  
START condition. Each data transfer is initiated with a  
START condition.  
can be signaled by the master generating  
Not-Acknowledge on the last byte that has been  
transmitted by the slave.  
a
Stop Data Transfer: A change in the state of the SDA line  
from low to high while the SCL line is high defines a STOP  
condition. Each data transfer terminates with a STOP or a  
repeated START condition.  
t(LOW)  
tF  
tR  
t(HDSTA)  
SCL  
SDA  
t(SUSTO)  
t(HDSTA)  
t(HIGH) t(SUSTA)  
t(HDDAT)  
t(SUDAT)  
t(BUF)  
P
S
S
P
Figure 13. Two-Wire Timing Diagram  
Table 12. Timing Diagram Definitions for Figure 13  
FAST MODE  
HIGH-SPEED MODE  
PARAMETER  
UNITS  
MIN  
MAX  
MIN  
0.001  
160  
MAX  
SCL Operating Frequency  
f
0.001  
600  
0.4  
3.4  
MHz  
ns  
(SCL)  
t
(BUF)  
Bus Free Time Between STOP and START Condition  
Hold time after repeated START condition.  
After this period, the first clock is generated.  
t
100  
100  
ns  
(HDSTA)  
Repeated START Condition Setup Time  
STOP Condition Setup Time  
Data Hold Time  
t
100  
100  
100  
100  
(2)  
0
ns  
ns  
ns  
ns  
ns  
ns  
ns  
(SUSTA)  
t
(SUSTO)  
(1)  
0
t
(HDDAT)  
Data Setup Time  
t
100  
1300  
600  
10  
160  
60  
(SUDAT)  
SCL Clock LOW Period  
SCL Clock HIGH Period  
Clock/Data Fall Time  
t
(LOW)  
t
(HIGH)  
t
F
300  
160  
160  
Clock/Data Rise Time  
t
R
t
R
300  
1000  
ns  
ns  
for SCLK ≤ 100kHz  
(1)  
(2)  
For cases with fall time of SCL less than 20ns and/or the rise time or fall time of SDA less than 20ns, the hold time should be greater than 20ns.  
For cases with fall time of SCL less than 10ns and/or the rise or fall time of SDA less than 10ns, the hold time should be greater than 10ns.  
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1
9
1
9
…
…
SCL  
SDA  
1
1
0
0
1
1
0
0(1) R/W  
P7 P6 P5  
P4 P3  
P2 P1  
P0  
Start By  
Master  
ACK By  
TMP411A  
ACK By  
TMP411A  
Frame 2 Pointer Register Byte  
Frame 1 Two−Wire Slave Address Byte  
9
1
9
SCL  
(Continued)  
SDA  
(Continued)  
D7 D6 D5 D4 D3 D2 D1 D0  
D7  
D6 D5 D4 D3 D2 D1 D0  
ACK By  
TMP411A  
ACK By  
TMP411A  
Stop By  
Master  
Frame 3 Data Byte 1  
Frame 4 Data Byte 2  
NOTE (1): Slave address 1001100 (TMP411A) shown. Slave address changes for TMP411B and TMP411C. See Ordering Information table for more details.  
Figure 14. Two-Wire Timing Diagram for Write Word Format  
1
1
9
1
9
SCL  
SDA  
1
0
0(1)  
0
0
1
R/W  
P7  
P6  
P5  
P4  
P3  
P2  
P1  
P0  
Start By  
Master  
ACK By  
TMP411A  
ACK By  
TMP411A  
Frame 1 Two−Wire Slave Address Byte  
Frame 2 Pointer Register Byte  
1
1
9
1
9
SCL  
(Continued)  
SDA  
(Continued)  
1
0
0(1)  
0
0
1
R/W  
D7  
D6  
D5  
D4 D3  
D2  
D1  
D0  
Start By  
Master  
ACK By  
TMP411A  
From  
TMP411A  
NACK By  
Master(2)  
Frame 3 Two−Wire Slave Address Byte  
Frame 4 Data Byte 1 Read Register  
NOTES: (1) Slave address 1001100 (TMP411A) shown. Slave address changes for TMP411B and TMP411C. See Ordering Information table for more details.  
(2) Master should leave SDA high to terminate a single−byte read operation.  
Figure 15. Two-Wire Timing Diagram for Single-Byte Read Format  
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1
1
9
1
9
SCL  
SDA  
0
0
1
1
0
0(1) R/W  
P7  
P6  
P5  
P4  
P3  
P2  
P1  
P0  
Start By  
ACK By  
ACK By  
Master  
TMP411A  
TMP411A  
Frame 1 Two−Wire Slave Address Byte  
Frame 2 Pointer Register Byte  
1
1
9
1
9
SCL  
(Continued)  
SDA  
(Continued)  
1
0
0(1)  
0
0
1
R/W  
D7  
D6  
D5  
D4 D3  
D2  
D1  
D0  
Start By  
Master  
ACK By  
TMP411A  
From  
TMP411A  
ACK By  
Master  
Frame 3 Two−Wire Slave Address Byte  
Frame 4 Data Byte 1 Read Register  
1
9
SCL  
(Continued)  
SDA  
(Continued)  
D7 D6  
D5  
D4  
D3  
D2 D1 D0  
From  
TMP411A  
NACK By Stop By  
Master(2)  
Master  
Frame 5 Data Byte 2 Read Register  
NOTES: (1) Slave address 1001100 (TMP411A) shown. Slave address changes for TMP411B and TMP411C. See Ordering Information table for more details.  
(2) Master should leave SDA high to terminate a two−byte read operation.  
Figure 16. Two-Wire Timing Diagram for Two-Byte Read Format  
ALERT  
SCL  
1
0
9
1
9
0(1)  
Status  
SDA  
0
0
1
1
0
0
R/W  
1
0
0
1
1
0
Start By  
Master  
ACK By  
TMP411A  
From  
TMP411A  
NACK By Stop By  
Master Master  
Frame 1 SMBus ALERT Response Address Byte  
Frame 2 Slave Address Byte  
NOTE (1): Slave address 1001100 (TMP411A) shown. Slave address changes for TMP411B and TMP411C. See Ordering Information table for more details.  
Figure 17. Timing Diagram for SMBus ALERT  
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configured for use as THERM2, a second THERM pin  
(Configuration Register: AL/TH bit = 1). The default setting  
configures pin 6 to function as ALERT (AL/TH = 0).  
HIGH-SPEED MODE  
In order for the Two-Wire bus to operate at frequencies  
above 400kHz, the master device must issue a  
High-speed mode (Hs-mode) master code (00001XXX) as  
the first byte after a START condition to switch the bus to  
high-speed operation. The TMP411 will not acknowledge  
this byte, but will switch the input filters on SDA and SCL  
and the output filter on SDA to operate in Hs-mode,  
allowing transfers at up to 3.4MHz. After the Hs-mode  
master code has been issued, the master transmits a  
Two-Wire slave address to initiate a data transfer  
operation. The bus continues to operate in Hs-mode until  
a STOP condition occurs on the bus. Upon receiving the  
STOP condition, the TMP411 switches the input and  
output filter back to fast-mode operation.  
The THERM pin asserts low when either the measured  
local or remote temperature is outside of the temperature  
range programmed in the corresponding Local/Remote  
THERM Limit Register. The THERM temperature limit  
range can be programmed with a wider range than that of  
the limit registers, which allows ALERT to provide an  
earlier warning than THERM. The THERM alarm resets  
automatically when the measured temperature returns to  
within the THERM temperature limit range minus the  
hysteresis value stored in the THERM Hysteresis  
Register. The allowable values of hysteresis are shown in  
Table 10. The default hysteresis is 10°C. When the  
ALERT/THERM2 pin is configured as a second thermal  
alarm (Configuration Register: bit 7 = 0, bit 5 = 1), it  
functions the same as THERM, but uses the temperatures  
stored in the Local/Remote Temperature High/Low Limit  
Registers to set its comparison range.  
TIMEOUT FUNCTION  
When bit 7 of the Consecutive Alert Register is set high,  
the TMP411 timeout function is enabled. The TMP411  
resets the serial interface if either SCL or SDA are held low  
for 30ms (typical) between a START and STOP condition.  
If the TMP411 is holding the bus low, it releases the bus  
and waits for a START condition. To avoid activating the  
When ALERT/THERM2 (pin 6) is configured as ALERT  
(Configuration Register: bit 7 = 0, bit 5 = 0), the pin asserts  
low when either the measured local or remote temperature  
violates the range limit set by the corresponding  
Local/Remote Temperature High/Low Limit Registers.  
This alert function can be configured to assert only if the  
range is violated a specified number of consecutive times  
(1, 2, 3, or 4). The consecutive violation limit is set in the  
Consecutive Alert Register. False alerts that occur as a  
result of environmental noise can be prevented by  
requiring consecutive faults. ALERT also asserts low if the  
remote temperature sensor is open-circuit. When the  
MASK function is enabled (Configuration Register:  
bit 7 = 1), ALERT is disabled (that is, masked). ALERT  
resets when the master reads the device address, as long  
as the condition that caused the alert no longer persists,  
and the Status Register has been reset.  
timeout function, it is necessary to maintain  
a
communication speed of at least 1kHz for the SCL  
operating frequency. The default state of the timeout  
function is enabled (bit 7 = high).  
THERM (PIN 4) AND ALERT/THERM2 (PIN 6)  
The TMP411 has two pins dedicated to alarm functions,  
the THERM and ALERT/THERM2 pins. Both pins are  
open-drain outputs that each require a pull-up resistor to  
V+. These pins can be wire-ORed together with other  
alarm pins for system monitoring of multiple sensors. The  
THERM pin provides a thermal interrupt that cannot be  
software disabled. The ALERT pin is intended for use as  
an earlier warning interrupt, and can be software disabled,  
or masked. The ALERT/THERM2 pin can also be  
THERM Limit and ALERT High Limit  
Measured  
Temperature  
ALERT Low Limit and THERM Limit Hysteresis  
THERM  
ALERT  
SMBus ALERT  
Read  
Read  
Time  
Read  
Figure 18. SMBus Alert Timing Diagram  
20  
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www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
SMBUS ALERT FUNCTION  
UNDER-VOLTAGE LOCKOUT  
The TMP411 supports the SMBus Alert function. When pin  
6 is configured as an alert output, the ALERT pin of the  
TMP411 may be connected as an SMBus Alert signal.  
When a master detects an alert condition on the ALERT  
line, the master sends an SMBus Alert command  
(00011001) on the bus. If the ALERT pin of the TMP411 is  
active, the devices will acknowledge the SMBus Alert  
command and respond by returning its slave address on  
the SDA line. The eighth bit (LSB) of the slave address  
byte indicates whether the temperature exceeding one of  
the temperature high limit settings or falling below one of  
the temperature low limit settings caused the alert  
condition. This bit will be high if the temperature is greater  
than or equal to one of the temperature high limit settings;  
this bit will be low if the temperature is less than one of the  
temperature low limit settings. See Figure 17 for details of  
this sequence.  
The TMP411 senses when the power-supply voltage has  
reached a minimum voltage level for the ADC converter to  
function. The detection circuitry consists of a voltage  
comparator that enables the ADC converter after the  
power supply (V+) exceeds 2.45V (typical). The  
comparator output is continuously checked during a  
conversion. The TMP411 will not perform a temperature  
conversion if the power supply is not valid. The last valid  
measured temperature is used for the temperature  
measurement result.  
GENERAL CALL RESET  
The TMP411 supports reset via the Two-Wire General Call  
address 00h (0000 0000b). The TMP411 acknowledges  
the General Call address and responds to the second byte.  
If the second byte is 06h (0000 0110b), the TMP411  
executes a software reset. This software reset restores the  
power-on reset state to all TMP411 registers, aborts any  
conversion in progress, and clears the ALERT and  
THERM pins. The TMP411 takes no action in response to  
other values in the second byte.  
If multiple devices on the bus respond to the SMBus Alert  
command, arbitration during the slave address portion of  
the SMBus Alert command determines which device will  
clear its alert status. If the TMP411 wins the arbitration, its  
ALERT pin becomes inactive at the completion of the  
SMBus Alert command. If the TMP411 loses the  
arbitration, the ALERT pin remains active.  
IDENTIFICATION REGISTERS  
The TMP411 allows for the Two-Wire bus controller to  
query the device for manufacturer and device IDs. This  
feature allows for software identification of the device at  
the particular Two-Wire bus address. The manufacturer ID  
is obtained by reading from pointer address FEh. The  
TMP411 manufacturer code is 55h. The device ID  
depends on the specific model; see the Register Map  
(Table 3). These registers are read-only.  
SHUTDOWN MODE (SD)  
The TMP411 Shutdown Mode allows the user to save  
maximum power by shutting down all device circuitry other  
than the serial interface, reducing current consumption to  
typically less than 3µA; see typical characteristic curve  
Shutdown Quiescent Current vs Supply Voltage.  
Shutdown Mode is enabled when the SD bit of the  
Configuration Register is high; the device shuts down  
once the current conversion is completed. When SD is low,  
the device maintains a continuous conversion state.  
FILTERING  
Remote junction temperature sensors are usually  
implemented in a noisy environment. Noise is most often  
created by fast digital signals, and it can corrupt  
measurements. The TMP411 has a built-in 65kHz filter on  
the inputs of D+ and D− to minimize the effects of noise.  
However, a bypass capacitor placed differentially across  
the inputs of the remote temperature sensor is  
recommended to make the application more robust  
against unwanted coupled signals. The value of the  
capacitor should be between 100pF and 1nF. Some  
applications attain better overall accuracy with additional  
series resistance; however, this increased accuracy is  
setup-specific. When series resistance is added, the value  
should not be greater than 3kΩ.  
SENSOR FAULT  
The TMP411 will sense a fault at the D+ input resulting  
from incorrect diode connection or an open circuit. The  
detection circuitry consists of a voltage comparator that  
trips when the voltage at D+ exceeds (V+) − 0.6V (typical).  
The comparator output is continuously checked during a  
conversion. If a fault is detected, the last valid measured  
temperature is used for the temperature measurement  
result, the OPEN bit (Status Register, bit 2) is set high, and,  
if the alert function is enabled, ALERT asserts low.  
When not using the remote sensor with the TMP411, the  
D+ and D− inputs must be connected together to prevent  
meaningless fault warnings.  
If filtering is needed, the suggested component values are  
100pF and 50Ω on each input. Exact values are  
application-specific.  
21  
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www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
3. Base resistance < 100Ω.  
REMOTE SENSING  
The TMP411 is designed to be used with either discrete  
transistors or substrate transistors built into processor  
chips and ASICs. Either NPN or PNP transistors can be  
used, as long as the base-emitter junction is used as the  
remote temperature sense. Either a transistor or diode  
connection can also be used; see Figure 11.  
4. Tight control of VBE characteristics indicated by small  
variations in hFE (that is, 50 to 150).  
Based on these criteria, two recommended small-signal  
transistors are the 2N3904 (NPN) or 2N3906 (PNP).  
MEASUREMENT ACCURACY AND THERMAL  
CONSIDERATIONS  
Errors in remote temperature sensor readings will be the  
consequence of the ideality factor and current excitation  
used by the TMP411 versus the manufacturer-specified  
The temperature measurement accuracy of the TMP411  
depends on the remote and/or local temperature sensor  
being at the same temperature as the system point being  
monitored. Clearly, if the temperature sensor is not in good  
thermal contact with the part of the system being  
monitored, then there will be a delay in the response of the  
sensor to a temperature change in the system. For remote  
temperature sensing applications using a substrate  
transistor (or a small, SOT23 transistor) placed close to the  
device being monitored, this delay is usually not a concern.  
operating current for  
a
given transistor. Some  
manufacturers specify a high-level and low-level current  
for the temperature-sensing substrate transistors. The  
TMP411 uses 6µA for ILOW and 120µA for IHIGH. The  
TMP411 allows for different n-factor values; see the  
N-Factor Correction Register section.  
The ideality factor (n) is a measured characteristic of a  
remote temperature sensor diode as compared to an ideal  
diode. The ideality factor for the TMP411 is trimmed to be  
1.008. For transistors whose ideality factor does not match  
the TMP411, Equation 4 can be used to calculate the  
temperature error. Note that for the equation to be used  
correctly, actual temperature (°C) must be converted to  
Kelvin (°K).  
The local temperature sensor inside the TMP411 monitors  
the ambient air around the device. The thermal time  
constant for the TMP411 is approximately two seconds.  
This constant implies that if the ambient air changes  
quickly by 100°C, it would take the TMP411 about 10  
seconds (that is, five thermal time constants) to settle to  
within 1°C of the final value. In most applications, the  
TMP411 package is in electrical and therefore thermal  
contact with the printed circuit board (PCB), as well as  
subjected to forced airflow. The accuracy of the measured  
temperature directly depends on how accurately the PCB  
and forced airflow temperatures represent the  
temperature that the TMP411 is measuring. Additionally,  
the internal power dissipation of the TMP411 can cause  
the temperature to rise above the ambient or PCB  
temperature. The internal power dissipated as a result of  
exciting the remote temperature sensor is negligible  
because of the small currents used. For a 5.5V supply and  
maximum conversion rate of eight conversions per  
second, the TMP411 dissipates 1.82mW (PDIQ = 5.5V ×  
330µA). If both the ALERT/THERM2 and THERM pins are  
each sinking 1mA, an additional power of 0.8mW is  
dissipated (PDOUT = 1mA × 0.4V + 1mA × 0.4V = 0.8mW).  
n * 1.008  
1.008  
ǒ
Ǔ
Ǔ
ǒ
+ ǒ  
Ǔ
  273.15 ) T °C  
TERR  
(4)  
Where:  
n = Ideality factor of remote temperature sensor  
T(°C) = actual temperature  
T
ERR = Error in TMP411 reading due to n ≠ 1.008  
Degree delta is the same for °C and °K  
For n = 1.004 and T(°C) = 100°C:  
1.004 * 1.008  
ǒ
Ǔ
+ ǒ  
Ǔ
TERR  
  273.15 ) 100°C  
1.008  
TERR + * 1.48°C  
(5)  
If a discrete transistor is used as the remote temperature  
sensor with the TMP411, the best accuracy can be  
achieved by selecting the transistor according to the  
following criteria:  
Total power dissipation is then 2.62mW (PDIQ + PDOUT  
)
and, with an qJA of 150°C/W, causes the junction  
temperature to rise approximately 0.393°C above the  
ambient.  
1. Base-emitter voltage > 0.25V at 6µA, at the highest  
sensed temperature.  
2. Base-emitter voltage < 0.95V at 120µA, at the lowest  
sensed temperature.  
22  
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www.ti.com  
SBOS383C − DECEMBER 2006 − REVISED MAY 2008  
LAYOUT CONSIDERATIONS  
Remote temperature sensing on the TMP411 measures  
very small voltages using very low currents; therefore,  
noise at the IC inputs must be minimized. Most  
applications using the TMP411 will have high digital  
content, with several clocks and logic level transitions  
creating a noisy environment. Layout should adhere to the  
following guidelines:  
GND(1)  
D+(1)  
Ground or V+ layer  
on bottom and/or  
top, if possible.  
1. Place the TMP411 as close to the remote junction  
sensor as possible.  
(1)  
−
D
2. Route the D+ and D− traces next to each other and  
shield them from adjacent signals through the use of  
ground guard traces, as shown in Figure 19. If a  
multilayer PCB is used, bury these traces between  
ground or VDD planes to shield them from extrinsic  
noise sources. 5 mil PCB traces are recommended.  
3. Minimize additional thermocouple junctions caused  
by copper-to-solder connections. If these junctions  
are used, make the same number and approximate  
locations of copper-to-solder connections in both the  
D+ and D− connections to cancel any thermocouple  
effects.  
GND(1)  
NOTE: (1) 5 mil traces with 5 mil spacing.  
Figure 19. Example Signal Traces  
4. Use a 0.1µF local bypass capacitor directly between  
the V+ and GND of the TMP411, as shown in  
Figure 20. Minimize filter capacitance between D+  
and D− to 1000pF or less for optimum measurement  
performance. This capacitance includes any cable  
capacitance between the remote temperature sensor  
and TMP411.  
µ
0.1 F Capacitor  
V+  
GND  
5. If the connection between the remote temperature  
sensor and the TMP411 is less than 8 inches, use a  
twisted-wire pair connection. Beyond 8 inches, use a  
twisted, shielded pair with the shield grounded as  
close to the TMP411 as possible. Leave the remote  
sensor connection end of the shield wire open to avoid  
ground loops and 60Hz pickup.  
PCB Via  
PCB Via  
1
8
7
6
5
2
3
4
TMP411  
Figure 20. Suggested Bypass Capacitor  
Placement  
23  
PACKAGE OPTION ADDENDUM  
www.ti.com  
16-Aug-2012  
PACKAGING INFORMATION  
Status (1)  
Eco Plan (2)  
MSL Peak Temp (3)  
Samples  
Orderable Device  
Package Type Package  
Drawing  
Pins  
Package Qty  
Lead/  
Ball Finish  
(Requires Login)  
TMP411AD  
TMP411ADG4  
TMP411ADGKR  
TMP411ADGKRG4  
TMP411ADGKT  
TMP411ADGKTG4  
TMP411ADR  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
SOIC  
SOIC  
D
D
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
75  
75  
Green (RoHS  
& no Sb/Br)  
CU NIPDAU Level-2-260C-1 YEAR  
Green (RoHS  
& no Sb/Br)  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
VSSOP  
VSSOP  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
DGK  
DGK  
D
2500  
2500  
250  
250  
2500  
2500  
75  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
TMP411ADRG4  
TMP411BD  
SOIC  
D
Green (RoHS  
& no Sb/Br)  
SOIC  
D
Green (RoHS  
& no Sb/Br)  
TMP411BDG4  
TMP411BDGKR  
TMP411BDGKRG4  
TMP411BDGKT  
TMP411BDGKTG4  
TMP411BDR  
SOIC  
D
75  
Green (RoHS  
& no Sb/Br)  
VSSOP  
VSSOP  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
DGK  
DGK  
D
2500  
2500  
250  
250  
2500  
2500  
75  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
TMP411BDRG4  
TMP411CD  
SOIC  
D
Green (RoHS  
& no Sb/Br)  
SOIC  
D
Green (RoHS  
& no Sb/Br)  
Addendum-Page 1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
16-Aug-2012  
Status (1)  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
Eco Plan (2)  
MSL Peak Temp (3)  
Samples  
Orderable Device  
Package Type Package  
Drawing  
Pins  
Package Qty  
Lead/  
Ball Finish  
(Requires Login)  
TMP411CDG4  
TMP411CDGKR  
TMP411CDGKRG4  
TMP411CDGKT  
TMP411CDGKTG4  
TMP411CDR  
SOIC  
VSSOP  
VSSOP  
VSSOP  
VSSOP  
SOIC  
D
8
8
8
8
8
8
8
75  
Green (RoHS  
& no Sb/Br)  
CU NIPDAU Level-2-260C-1 YEAR  
DGK  
DGK  
DGK  
DGK  
D
2500  
2500  
250  
Green (RoHS  
& no Sb/Br)  
CU NIPDAUAGLevel-2-260C-1 YEAR  
CU NIPDAUAGLevel-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
CU NIPDAU Level-2-260C-1 YEAR  
Green (RoHS  
& no Sb/Br)  
Green (RoHS  
& no Sb/Br)  
250  
Green (RoHS  
& no Sb/Br)  
2500  
2500  
Green (RoHS  
& no Sb/Br)  
TMP411CDRG4  
SOIC  
D
Green (RoHS  
& no Sb/Br)  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability  
information and additional product content details.  
TBD: The Pb-Free/Green conversion plan has not been defined.  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that  
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between  
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight  
in homogeneous material)  
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.  
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information  
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and  
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.  
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.  
Addendum-Page 2  
PACKAGE OPTION ADDENDUM  
www.ti.com  
16-Aug-2012  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.  
OTHER QUALIFIED VERSIONS OF TMP411 :  
Automotive: TMP411-Q1  
•
NOTE: Qualified Version Definitions:  
Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects  
•
Addendum-Page 3  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
31-Aug-2012  
TAPE AND REEL INFORMATION  
*All dimensions are nominal  
Device  
Package Package Pins  
Type Drawing  
SPQ  
Reel  
Reel  
A0  
B0  
K0  
P1  
W
Pin1  
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant  
(mm) W1 (mm)  
TMP411ADGKR  
TMP411ADGKT  
TMP411ADR  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
D
8
8
8
8
8
8
8
8
8
2500  
250  
330.0  
330.0  
330.0  
330.0  
330.0  
330.0  
330.0  
330.0  
330.0  
12.4  
12.4  
12.4  
12.4  
12.4  
12.4  
12.4  
12.4  
12.4  
5.3  
5.3  
6.4  
5.3  
5.3  
6.4  
5.3  
5.3  
6.4  
3.4  
3.4  
5.2  
3.4  
3.4  
5.2  
3.4  
3.4  
5.2  
1.4  
1.4  
2.1  
1.4  
1.4  
2.1  
1.4  
1.4  
2.1  
8.0  
8.0  
8.0  
8.0  
8.0  
8.0  
8.0  
8.0  
8.0  
12.0  
12.0  
12.0  
12.0  
12.0  
12.0  
12.0  
12.0  
12.0  
Q1  
Q1  
Q1  
Q1  
Q1  
Q1  
Q1  
Q1  
Q1  
2500  
2500  
250  
TMP411BDGKR  
TMP411BDGKT  
TMP411BDR  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
D
2500  
2500  
250  
TMP411CDGKR  
TMP411CDGKT  
TMP411CDR  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
D
2500  
Pack Materials-Page 1  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
31-Aug-2012  
*All dimensions are nominal  
Device  
Package Type Package Drawing Pins  
SPQ  
Length (mm) Width (mm) Height (mm)  
TMP411ADGKR  
TMP411ADGKT  
TMP411ADR  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
D
8
8
8
8
8
8
8
8
8
2500  
250  
366.0  
366.0  
367.0  
366.0  
366.0  
367.0  
366.0  
366.0  
367.0  
364.0  
364.0  
367.0  
364.0  
364.0  
367.0  
364.0  
364.0  
367.0  
50.0  
50.0  
35.0  
50.0  
50.0  
35.0  
50.0  
50.0  
35.0  
2500  
2500  
250  
TMP411BDGKR  
TMP411BDGKT  
TMP411BDR  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
D
2500  
2500  
250  
TMP411CDGKR  
TMP411CDGKT  
TMP411CDR  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
D
2500  
Pack Materials-Page 2  
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