MAX6692YMSA+ [MAXIM]
Serial Switch/Digital Sensor, 10 Bit(s), 0.80Cel, BICMOS, Rectangular, 8 Pin, Surface Mount, SOP-8;
| 型号： | MAX6692YMSA+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Serial Switch/Digital Sensor, 10 Bit(s), 0.80Cel, BICMOS, Rectangular, 8 Pin, Surface Mount, SOP-8 信息通信管理 输出元件 传感器 换能器 |
| 文件： | 总16页 (文件大小：194K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2545; Rev 4; 6/±8
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
General Description
Features
o Dual Channel Measures Remote and Local
The MAX6648/MAX6692 are precise, two-channel digi-
tal temperature sensors. They accurately measure the
temperature of their own die and a remote PN junction,
and report the temperature in digital form using a 2-wire
serial interface. The remote PN junction is typically the
emitter-base junction of a common-collector PNP on a
CPU, FPGA, or ASIC.
Temperature
o +0.125°C Resolution
o High Accuracy 0.8°C ꢀmaxꢁ from +25°C to +125°C
ꢀRemoteꢁ, and 2°C ꢀmaxꢁ from +60°C to +100°C
ꢀLocalꢁ
o Two Alarm Outputs: ALERT and OVERT
The 2-wire serial interface accepts standard System
Management Bus (SMBus)™ write byte, read byte,
send byte, and receive byte commands to read the
temperature data and to program the alarm thresholds.
To enhance system reliability, the MAX6648/MAX6692
include an SMBus timeout. A fault queue prevents the
ALERT and OVERT outputs from setting until a fault has
been detected one, two, or three consecutive times
(programmable).
o Two Default OVERT Thresholds Available
MAX6648: +110°C
MAX6692: +85°C
o Programmable Conversion Rate
o SMBus-Compatible Interface
o SMBus Timeout
o Programmable Under/Overtemperature Alarm
Thresholds
The MAX6648/MAX6692 provide two system alarms:
ALERT and OVERT. ALERT asserts when any of four tem-
perature conditions are violated: local overtemperature,
remote overtemperature, local undertemperature, or
remote undertemperature. OVERT asserts when the tem-
perature rises above the value in either of the two OVERT
limit registers. The OVERT output can be used to activate
a cooling fan, or to trigger a system shutdown.
o Compatible with 90nm, 65nm, and 45nm Process
Technology
Ordering Information
PIN-
PACKAGE
MEASURED
TEMP RANGE
PART
MAX6648MUA
MAX6648YMUA
MAX6692MUA
MAX6692MSA
MAX6692YMUA
MAX6692YMSA
8 µMAX
8 µMAX
8 µMAX
8 SO
±ꢀC to +125ꢀC
±ꢀC to +125ꢀC
±ꢀC to +125ꢀC
±ꢀC to +125ꢀC
±ꢀC to +125ꢀC
±ꢀC to +125ꢀC
Measurements can be done autonomously, with the
conversion rate programmed by the user, or in a single-
shot mode. The adjustable conversion rate allows the
user to optimize supply current and temperature
update rate to match system needs.
8 µMAX
8 SO
Remote accuracy is ±±.8ꢀC maꢁimum error between
+25ꢀC and +125ꢀC with no calibration needed. The
MAX6648/MAX6692 operate from -55ꢀC to +125ꢀC, and
measure temperatures between ±ꢀC and +125ꢀC. The
MAX6648 is available in an 8-pin µMAX® package, and the
MAX6692 is available in 8-pin µMAX and SO packages.
Note: All devices operate over the -55ꢀC to +125ꢀC temperature
range.
Typical Operating Circuit
Applications
3.3V
0.1μF
200Ω
Desktop Computers
Notebook Computers
Servers
V
CC
10kΩ EACH
DXP
DATA
SDA
Thin Clients
MAX6648
CLOCK
SCLK
Workstations
MAX6692
ALERT
INTERRUPTED TO μP
DXN
Test and Measurement
Multichip Modules
2200pF
OVERT
TO FAN DRIVER OR
SYSTEM SHUTDOWN
GND
μP
SMBus is a trademark of Intel Corp.
Pin Configuration and Functional Diagram appear at end of
data sheet.
µMAX is a registered trademark of Maꢁim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
ESD Protection (all pins, Human Body Model)................±2±±±V
Junction Temperature......................................................+15±ꢀC
Operating Temperature Range .........................-55ꢀC to +125ꢀC
Storage Temperature Range.............................-65ꢀC to +15±ꢀC
Lead Temperature (soldering, 1±s) .................................+3±±ꢀC
V
...........................................................................-±.3V to +6V
CC
DXP.............................................................-±.3V to (V
+ ±.3V)
CC
DXN .......................................................................-±.3V to +±.8V
SCLK, SDA, ALERT, OVERT.....................................-±.3V to +6V
SDA, ALERT, OVERT Current .............................-1mA to +5±mA
DXN Current .......................................................................±1mA
Continuous Power Dissipation (T = +7±ꢀC)
A
8-Pin µMAX (derate 5.9mW/ꢀC above +7±ꢀC).............471mW
8-Pin SO (derate 5.9mW/ꢀC above +7±ꢀC)..................471mW
Stresses beyond those listed under “Absolute Maꢁimum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Eꢁposure to
absolute maꢁimum rating conditions for eꢁtended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= 3.±V to 5.5V, T = -55ꢀC to +125ꢀC, unless otherwise specified. Typical values are at V
= 3.3V and T = +85ꢀC.) (Note 1)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
3.±
TYP
MAX
UNITS
V
48/MAX692
Supply Voltage
V
5.5
CC
±.125
ꢀC
Temperature Resolution
1±
Bits
V
= 3.3V,
= +85ꢀC
CC
T
= +25ꢀC to +125ꢀC
-±.8
+±.8
RJ
T
A
V
= 3.3V,
CC
T
T
= +6±ꢀC to +1±±ꢀC
= ±ꢀC to +125ꢀC
-1.±
-1.6
+1.±
+1.6
RJ
Remote Temperature Error
n = 1.±±8
ꢀC
+6±ꢀC ≤ T
+1±±ꢀC
≤
A
RJ
V
= 3.3V, +±ꢀC
CC
T
RJ
= ±ꢀC to +125ꢀC
-3.±
+3.±
≤ T ≤ +1±±ꢀC
A
T
T
= +6±ꢀC to +1±±ꢀC
= ±ꢀC to +125ꢀC
-2.±
-3.±
+2.±
+3.±
A
Local Temperature Error
V
= 3.3V
= 3.3V
ꢀC
ꢀC
CC
CC
A
T = +6±ꢀC to +1±±ꢀC
A
-4.±
-4.4
Local Temperature Error
(MAX6648Y/MAX6692Y)
V
T
A
= ±ꢀC to +125ꢀC
Supply Sensitivity of Temperature
Error
±±.2
2.7
ꢀC/V
V
Undervoltage Lockout (UVLO)
Threshold
UVLO
Falling edge of V
disables ADC
2.4
2.95
CC
UVLO Hysteresis
9±
2.±
9±
mV
V
Power-On-Reset (POR) Threshold
POR Threshold Hysteresis
Standby Supply Current
Operating Current
V
falling edge
CC
mV
µA
mA
SMBus static
During conversion
3.5
±.45
4±
12
±.8
8±
±.25 conversions per second
2 conversions per second
Average Operating Current
µA
25±
125
4±±
156
+25
1±±
Conversion Time
t
From stop bit to conversion completion
95
ms
%
CONV
Conversion Time Error
DXP and DXN Leakage Current
-25
Standby mode
nA
2
_______________________________________________________________________________________
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
ELECTRICAL CHARACTERISTICS ꢀcontinuedꢁ
(V
= 3.±V to 5.5V, T = -55ꢀC to +125ꢀC, unless otherwise specified. Typical values are at V
= 3.3V and T = +85ꢀC.) (Note 1)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
8±
8
TYP
1±±
1±
MAX
12±
12
UNITS
High level
Low level
Remote-Diode Source Current
ALERT, OVERT
I
µA
RJ
I
I
= 1mA
= 4mA
= 5.5V
±.4
±.6
1
SINK
Output Low Voltage
V
SINK
Output High Leakage Current
V
µA
OH
SMBus-COMPATIBLE INTERFACE ꢀSCLK AND SDAꢁ
Logic Input Low Voltage
V
±.8
+1
V
V
IL
V
V
V
V
= 3.±V
= 5.5V
2.2
2.6
-1
CC
CC
Logic Input High Voltage
V
IH
Input Leakage Current
Output Low-Sink Current
Input Capacitance
I
= GND or V
= ±.6V
µA
mA
pF
LEAK
IN
CC
I
6
SINK
OL
C
5
IN
SMBus-COMPATIBLE TIMING (Note 2)
Serial Clock Frequency
f
(Note 3)
1±±
kHz
µs
SCLK
Bus Free Time Between STOP and
START Condition
t
4.7
4.7
5±
BUF
START Condition Setup Time
µs
Repeat START Condition Setup
Time
t
9±% to 9±%
ns
SU:STA
START Condition Hold Time
STOP Condition Setup Time
Clock Low Period
t
t
1±% of SDA to 9±% of SCLK
9±% of SCLK to 9±% of SDA
1±% to 1±%
4
4
µs
µs
µs
µs
µs
µs
ns
ns
ms
HD:STA
SU:STO
t
4.7
4
LOW
Clock High Period
t
9±% to 9±%
HIGH
Data Setup Time
t
(Note 4)
25±
HD:DAT
Receive SCLK/SDA Rise Time
Receive SCLK/SDA Fall Time
Pulse Width of Spike Suppressed
SMBus Timeout
t
1
R
t
3±±
5±
F
t
±
SP
TIMEOUT
t
SDA low period for interface reset
25
37
55
Note 1: All parameters tested at a single temperature. Specifications over temperature are guaranteed by design.
Note 2: Timing specifications guaranteed by design.
Note 3: The serial interface resets when SCLK is low for more than t
.
TIMEOUT
Note 4: A transition must internally provide at least a hold time to bridge the undefined region (3±±ns maꢁ) of SCLK’s falling edge.
_______________________________________________________________________________________
3
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
Typical Operating Characteristics
(V
= 3.3V, T = +25ꢀC, unless otherwise noted.)
A
CC
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
OPERATING SUPPLY CURRENT
vs. CONVERSION RATE
2.5
1.5
4.0
600
500
400
300
200
100
0
3.6
0.5
3.2
2.8
2.4
-0.5
-1.5
-2.5
T
= +85°C
A
FAIRCHILD 2N3906
0
25
50
75
100
125
3.0
3.5
4.0
4.5
5.0
5.5
0.63 0.13 0.25 0.50 1.00 2.00 4.00
CONVERSION RATE (Hz)
48/MAX692
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
REMOTE TEMPERATURE ERROR
vs. 45nm REMOTE DIODE TEMPERATURE
TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
1.0
0.8
6
4
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
LOCAL ERROR
0.6
0.4
2
0.2
0
0
-0.2
-0.4
-0.6
-0.8
-1.0
-2
-4
-6
REMOTE ERROR
V
= SQUARE WAVE APPLIED TO V
CC
IN
WITH NO 0.1μF V CAPACITOR
CC
0
25
50
75
100
125
50
60
70
80
90
100
0.1
1
10
100
1k
10k
100k
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (Hz)
TEMPERATURE ERROR
vs. DIFFERENTIAL-MODE NOISE FREQUENCY
2.0
TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCE
1
0
9
8
V
V
= AC-COUPLED TO DXN
IN
IN
= 100mV
1.5
1.0
P-P
7
REMOTE ERROR
6
-1
-2
-3
-4
-5
-6
5
0.5
4
0
3
-0.5
-1.0
-1.5
-2.0
2
LOCAL ERROR
1
0
V
= 20mV SQUARE WAVE
P-P
IN
-1
-2
APPLIED TO DXP-DXN
0.100
1.000
10.000
100.000
1
10
100
1k
10k
100k
1
10
100
1k
10k
100k
DXP-DXN CAPACITANCE (nF)
FREQUENCY (Hz)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
Pin Description
PIN
NAME
FUNCTION
Supply Voltage Input, 3V to 5.5V. Bypass V to GND with a ±.1µF capacitor. A 2±±Ω series
resistor is recommended but not required for additional noise filtering.
CC
1
V
CC
Combined Remote-Diode Current Source and A/D Positive Input for Remote-Diode Channel. DO
NOT LEAVE DXP DISCONNECTED; connect DXP to DXN if no remote diode is used. Place a
22±±pF capacitor between DXP and DXN for noise filtering.
2
3
DXP
DXN
Combined Remote-Diode Current Sink and A/D Negative Input. DXN is internally biased to one
diode drop above ground.
Overtemperature Alert/Interrupt Output, Open Drain. OVERT is logic low when the temperature is
above the software-programmed threshold.
4
5
OVERT
GND
Ground
SMBus Alert (Interrupt) Output, Open Drain. ALERT asserts when temperature eꢁceeds user-set
limits (high or low temperature). ALERT stays asserted until acknowledged by either reading the
status register or by successfully responding to an alert response address, provided that the fault
condition no longer eꢁists. See the ALERT Interrupts section.
6
ALERT
7
8
SDA
SMBus Serial-Data Input/Output, Open Drain
SMBus Serial-Clock Input
SCLK
ADC and Multiplexer
Detailed Description
The averaging ADC integrates over a 6±ms period
(each channel, typically), with eꢁcellent noise rejection.
The multipleꢁer automatically steers bias currents
through the remote and local diodes. The ADC and
associated circuitry measure each diode’s forward volt-
age and compute the temperature based on this volt-
age. Both channels are automatically converted once
the conversion process has started, either in free-run-
ning or single-shot mode. If one of the two channels is
not used, the device still performs both measurements,
and the user can ignore the results of the unused chan-
The MAX6648/MAX6692 are temperature sensors
designed to work in conjunction with a microprocessor
or other intelligence in thermostatic, process-control, or
monitoring applications. Communication with the
MAX6648/MAX6692 occurs through the SMBus-com-
patible serial interface and dedicated alert pins. ALERT
asserts if the measured local or remote temperature is
greater than the software-programmed ALERT high
limit or less than the ALERT low limit. ALERT also
asserts if the remote-sensing diode pins are shorted or
unconnected. The overtemperature alarm, OVERT,
asserts if the software-programmed OVERT limit is
eꢁceeded. OVERT can be connected to fans, a system
shutdown, a clock throttle control, or other thermal-
management circuitry.
Table 1. Main Temperature Data Register
Format ꢀ00h, 01hꢁ
TEMP ꢀ°Cꢁ
DIGITAL OUTPUT
± 111 1111
± 111 1111
± 111 1111
± ±±1 1±±1
± ±±± ±±±±
± ±±± ±±±±
± ±±± ±±±±
± ±±± ±±±±
The MAX6648/MAX6692 convert temperatures to digital
data either at a programmed rate or in single conver-
sions. Temperature data is represented as 1± bits plus
sign, with the LSB equal to ±.125ꢀC. The “main” tempera-
ture data registers (at addresses ±±h and ±1h) are 8-bit
registers that represent the data as 7 bits with the final
MSB indicating the diode fault status (Table 1). The
remaining 3 bits of temperature data are available in the
“eꢁtended” registers at addresses 11h and 1±h (Table 2).
13±
127
126
25
±
<±
-1
-25
Diode fault
(short or open)
1 ±±± ±±±±
_______________________________________________________________________________________
5
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
nel. If the remote-diode channel is unused, connect
DXP to DXN rather than leaving the pins open.
The MAX6648/MAX6692 employ four standard SMBus
protocols: write byte, read byte, send byte, and receive
byte (Figures 1, 2, and 3). The shorter receive byte proto-
col allows quicker transfers, provided that the correct
data register was previously selected by a read byte
instruction. Use caution when using the shorter protocols
in multimaster systems, as a second master could over-
write the command byte without informing the first master.
The DXN input is biased to one V
above ground by
BE
an internal diode to prepare the ADC inputs for a differ-
ential measurement. The worst-case DXP-DXN differen-
tial input voltage range is ±.25V to ±.95V. Eꢁcess
resistance in series with the remote diode causes
+±.5ꢀC (typ) error per ohm.
Temperature data can be read from the read internal
temperature (±±h) and read eꢁternal temperature (±1h)
registers. The temperature data format for these regis-
ters is 7 bits plus 1 bit, indicating the diode fault status
for each channel, with the LSB representing 1ꢀC (Table
1). The MSB is transmitted first.
A/D Conversion Sequence
A conversion sequence consists of a local temperature
measurement and a remote temperature measurement.
Each time a conversion begins, whether initiated auto-
matically in the free-running autonomous mode (RUN = ±)
or by writing a one-shot command, both channels are
converted, and the results of both measurements are
available after the end of a conversion. A BUSY status bit
in the status byte indicates that the device is performing a
new conversion. The results of the previous conversion
are always available, even if the ADC is busy.
An additional 3 bits can be read from the read eꢁternal
eꢁtended temperature register (1±h), which eꢁtends the
data to 1± bits plus sign and the resolution to ±.125ꢀC
per LSB (Table 2). An additional 3 bits can be read
from the read internal eꢁtended temperature register
(11h), which eꢁtends the data to 1± bits (plus 1 bit indi-
cating the diode fault status) and the resolution to
±.125ꢀC per LSB (Table 2).
48/MAX692
Low-Power Standby Mode
Standby mode reduces the supply current to less than
1±µA by disabling the ADC and timing circuitry. Enter
standby mode by setting the RUN bit to 1 in the configu-
ration byte register (Table 6). All data is retained in mem-
ory, and the SMBus interface is active and listening for
SMBus commands. Standby mode is not a shutdown
mode. With activity on the SMBus, the device draws more
supply current (see Typical Operating Characteristics). In
standby mode, the MAX6648/MAX6692 can be forced to
perform A/D conversions through the one-shot command,
regardless of the RUN bit status.
When a conversion is complete, the main temperature
register and the eꢁtended temperature register are
updated simultaneously. Ensure that no conversions
are completed between reading the main register and
the eꢁtended register, so that both registers contain the
result of the same conversion.
To ensure valid eꢁtended data, read eꢁtended resolu-
tion temperature data using one of the following
approaches:
1) Put the MAX6648/MAX6692 into standby mode by
setting bit 6 of the configuration register to 1. Initiate
a one-shot conversion using command byte ±Fh.
When this conversion is complete, read the contents
of the temperature data registers.
If a standby command is received while a conversion is
in progress, the conversion cycle is truncated, and the
data from that conversion is not latched into a tempera-
ture register. The previous data is not changed and
remains available.
Supply-current drain during the 125ms conversion peri-
od is 5±±µA (typ). Slowing down the conversion rate
reduces the average supply current (see Typical
Operating Characteristics). Between conversions, the
conversion rate timer consumes about 25µA of supply
current. In standby mode, supply current drops to
about 3µA.
Table 2. Extended Resolution Temperature
Register Data Format ꢀ10h, 11hꢁ
FRACTIONAL TEMP ꢀ°Cꢁ
DIGITAL OUTPUT
±±±X XXXX
±±1X XXXX
±1±X XXXX
±11X XXXX
1±±X XXXX
1±1X XXXX
11±X XXXX
111X XXXX
±.±±±
±.125
±.25±
±.375
±.5±±
±.625
±.75±
±.875
SMBus Digital Interface
From a software perspective, the MAX6648/MAX6692
appear as a set of byte-wide registers that contain tem-
perature data, alarm threshold values, and control bits.
A standard SMBus-compatible 2-wire serial interface is
used to read temperature data and write control bits
and alarm threshold data. These devices respond to the
same SMBus slave address for access to all functions.
6
_______________________________________________________________________________________
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
Write Byte Format
S
ADDRESS
WR
ACK
COMMAND
ACK
DATA
ACK
P
7 bits
8 bits
8 bits
1
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Command Byte: selects which
register you are writing to
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
Read Byte Format
S
ADDRESS
WR
ACK
COMMAND
ACK
S
ADDRESS
RD
ACK
DATA
///
P
7 bits
8 bits
7 bits
8 bits
Slave Address: equiva-
lent to chip-select line
Command Byte: selects
which register you are
reading from
Slave Address: repeated
due to change in data-
flow direction
Data Byte: reads from
the register set by the
command byte
Send Byte Format
Receive Byte Format
S
ADDRESS
RD
ACK DATA
///
P
S
ADDRESS WR ACK COMMAND ACK
P
7 bits
8 bits
7 bits
8 bits
Data Byte: reads data from
the register commanded
by the last Read Byte or
Write Byte transmission;
also used for SMBus Alert
Response return address
Command Byte: sends com-
mand with no data, usually
used for one-shot command
S = Start condition
P = Stop condition
Shaded = Slave transmission
/// = Not acknowledged
Figure 1. SMBus Protocols
A
B
C
D
E
F
G
H
I
J
K
L
M
t
t
HIGH
LOW
SMBCLK
SMBDATA
t
t
t
t
HD:DAT
HD:STA
SU:STA
SU:DAT
t
t
SU:STO
BUF
A = START CONDITION
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
M = NEW START CONDITION
E = SLAVE PULLS SMBDATA LINE LOW
Figure 2. SMBus Write Timing Diagram
2) If the MAX6648/MAX6692 are in run mode, read the
status byte. If the BUSY bit indicates that a conversion
is in progress, wait until the conversion is complete
(BUSY bit set to zero) before reading the temperature
data. Following a conversion completion, immediately
read the contents of the temperature data registers. If
no conversion is in progress, the data can be read
within a few microseconds, which is a sufficiently short
period of time to ensure that a new conversion cannot
be completed until after the data has been read.
_______________________________________________________________________________________
7
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
A
B
C
D
E
F
G
H
I
J
K
L
M
t
t
HIGH
LOW
SMBCLK
SMBDATA
t
t
BUF
SU:STO
t
t
t
SU:DAT
SU:STA HD:STA
A = START CONDITION
E = SLAVE PULLS SMBDATA LINE LOW
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
M = NEW START CONDITION
Figure 3. SMBus Read Timing Diagram
Alarm Threshold Registers
The ALERT interrupt output signal is latched and can
be cleared only by either reading the status register or
by successfully responding to an alert response
address. In both cases, the alert is cleared only if the
fault condition no longer eꢁists. Asserting ALERT does
not halt automatic conversion. The ALERT output pin is
open drain, allowing multiple devices to share a com-
mon interrupt line.
48/MAX692
Four registers store ALERT threshold values—one high-
temperature (T
) and one low-temperature (T
)
LOW
HIGH
register each for the local and remote channels. If
either measured temperature equals or eꢁceeds the
corresponding ALERT threshold value, the ALERT inter-
rupt asserts.
The power-on-reset (POR) state of both ALERT T
HIGH
registers is full scale (±1±1 ±1±1, or +85ꢀC). The POR
state of both T registers is ±±±± ±±±±, or ±ꢀC.
The MAX6648/MAX6692 respond to the SMBus alert
response address, an interrupt pointer return-address
feature (see the Alert Response Address section). Prior
to taking corrective action, always check to ensure that
an interrupt is valid by reading the current temperature.
LOW
Two additional registers store remote and local alarm
threshold data corresponding to the OVERT output. The
values stored in these registers are high-temperature
thresholds. If either of the measured temperatures
equals or eꢁceeds the corresponding alarm threshold
value, an OVERT output asserts. The POR state of the
OVERT threshold is ±11± 111± or +11±ꢀC for the
MAX6648, and ±1±1 ±1±1 or +85ꢀC for the MAX6692.
Fault Queue Register
In some systems, it may be desirable to ignore a single
temperature measurement that falls outside the ALERT
limits. Bits 2 and 3 of the fault queue register (address
22h) determine the number of consecutive temperature
faults necessary to set ALERT (see Tables 3 and 4).
Diode Fault Alarm
A continuity fault detector at DXP detects an open cir-
Alert Response Address
The SMBus alert response interrupt pointer provides
quick fault identification for simple slave devices that
lack the compleꢁ, eꢁpensive logic needed to be a bus
master. Upon receiving an ALERT interrupt signal, the
host master can broadcast a receive byte transmission
to the alert response slave address (±±±1 1±±).
Following such a broadcast, any slave device that gen-
erated an interrupt attempts to identify itself by putting
its own address on the bus.
cuit between DXP and DXN, or a DXP short to V
,
CC
GND, or DXN. If an open or short circuit eꢁists, the
eꢁternal temperature register is loaded with 1±±± ±±±±.
If the fault is an open-circuit fault bit 2 (OPEN) of the
status byte, it is set to 1 and the ALERT condition is
activated at the end of the conversion. Immediately
after POR, the status register indicates that no fault is
present. If a fault is present upon power-up, the fault is
not indicated until the end of the first conversion.
ALERT Interrupts
The ALERT interrupt occurs when the internal or eꢁter-
nal temperature reading eꢁceeds a high- or low-tem-
perature limit (user programmed) or when the remote
diode is disconnected (for continuity fault detection).
The alert response can activate several different slave
devices simultaneously, similar to the I2C general call. If
more than one slave attempts to respond, bus arbitration
rules apply, and the device with the lower address
code wins. The losing device does not generate an
8
_______________________________________________________________________________________
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
Table 4. Fault Queue Length Bit Definition
Table 3. Fault Queue Register Bit Definition
ꢀ22hꢁ
FQ1
FQ0
FAULT QUEUE LENGTH ꢀSAMPLESꢁ
POR
STATE
±
±
1
1
±
1
1
±
1
2
BIT
NAME
RFU
RFU
FQ1
FUNCTION
3
Reserved. Always write 1 to
this bit.
7
1
—
Reserved. Always write
zero to this bit.
6 to 3
±
±
±
±
conversion is in progress when a one-shot command is
received, the command is ignored. If a one-shot com-
mand is received in autonomous mode (RUN bit = ±)
between conversions, a new conversion begins, the
conversion rate timer is reset, and the neꢁt automatic
conversion takes place after a full delay elapses.
Fault queue-length control
bit (see Table 4).
2
1
±
Fault queue-length control
bit (see Table 4).
FQ±
Reserved. Always write
zero to this bit.
RFU
Configuration Byte Functions
The configuration byte register (Table 6) is a read-write
register with several functions. Bit 7 is used to mask (dis-
able) interrupts. Bit 6 puts the MAX6648/MAX6692 into
standby mode (STOP) or autonomous (RUN) mode.
acknowledge and continues to hold the ALERT line low
until cleared. (The conditions for clearing an ALERT
vary, depending on the type of slave device).
Successful completion of the read alert response proto-
col clears the interrupt latch, provided the condition
that caused the alert no longer eꢁists.
Status Byte Functions
The status byte register (Table 7) indicates which (if
any) temperature thresholds have been eꢁceeded. This
byte also indicates whether the ADC is converting and
whether there is an open-circuit fault detected in the
eꢁternal sense junction. After POR, the normal state of
all flag bits is zero, assuming no alarm conditions are
present. The status byte is cleared by any successful
read of the status byte, after a conversion is complete
and the fault no longer eꢁists. Note that the ALERT
interrupt latch is not automatically cleared when the
status flag bit indicating the ALERT is cleared. The fault
condition must be eliminated before the ALERT output
can be cleared.
OVERT Overtemperature Alarm/Warning
Outputs
OVERT asserts when the temperature rises to a value
stored in one of the OVERT limit registers (19h, 2±h). It
deasserts when the temperature drops below the
stored limit, minus hysteresis. OVERT can be used to
activate a cooling fan, send a warning, invoke clock
throttling, or trigger a system shutdown to prevent com-
ponent damage.
Command Byte Functions
The 8-bit command byte register (Table 5) is the master
indeꢁ that points to the various other registers within the
MAX6648/MAX6692. The register’s POR state is ±±±±
±±±±, so a receive byte transmission (a protocol that
lacks the command byte) that occurs immediately after
POR, returns the current local temperature data.
When autoconverting, if the T
and T
limits are
LOW
HIGH
close together, it is possible for both high-temp and
low-temp status bits to be set, depending on the
amount of time between status read operations (espe-
cially when converting at the fastest rate). In these cir-
cumstances, it is best not to rely on the status bits to
indicate reversals in long-term temperature changes.
Instead use a current temperature reading to establish
the trend direction.
The MAX6648/MAX6692 incorporate collision avoid-
ance so that completely asynchronous operation is
allowed between SMBus operations and temperature
conversions.
Conversion Rate Byte
The conversion rate register (Table 8) programs the
time interval between conversions in free-running
autonomous mode (RUN = ±). This variable rate control
can be used to reduce the supply current in portable-
equipment applications. The conversion rate byte’s
POR state is ±7h or 4Hz. The MAX6648/MAX6692 look
One-Shot
The one-shot command immediately forces a new con-
version cycle to begin. If the one-shot command is
received while the MAX6648/MAX6692 are in standby
mode (RUN bit = 1), a new conversion begins, after
which the device returns to standby mode. If a one-shot
_______________________________________________________________________________________
9
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
Table 5. Command-Byte Bit Assignments
REGISTER
RLTS
ADDRESS
±±h
POR STATE
±±±± ±±±±
FUNCTION
Read local (internal) temperature
±ꢀC
±ꢀC
—
RRTE
RSL
±1h
±±±± ±±±±
N/A
Read remote (eꢁternal) temperature
Read status byte
±2h
RCL
±3h
±±±± ±±±±
±±±± ±111
±1±1 ±1±1
±±±± ±±±±
±1±1 ±1±1
±±±± ±±±±
N/A
—
Read configuration byte
RCRA
RLHN
RLLI
±4h
—
Read conversion rate byte
±5h
+85ꢀC
±ꢀC
+85ꢀC
±ꢀC
—
Read local (internal) ALERT high limit
Read local (internal) ALERT low limit
Read remote (eꢁternal) ALERT high limit
Read remote (eꢁternal) ALERT low limit
Write configuration byte
±6h
RRHI
±7h
RRLS
WCA
±8h
±9h
WCRW
WLHO
WLLM
WRHA
WRLN
OSHT
REET
RIET
±Ah
±Bh
±Ch
±Dh
±Eh
±Fh
N/A
—
Write conversion rate byte
N/A
—
Write local (internal) ALERT high limit
Write local (internal) ALERT low limit
Write remote (eꢁternal) ALERT high limit
Write remote (eꢁternal) ALERT low limit
One-shot
N/A
—
48/MAX692
N/A
—
N/A
—
N/A
—
1±h
±±±± ±±±±
±±±± ±±±±
±11± 111±
±1±1 ±1±1
±1±1 ±1±1
±±±± 1±1±
1±±± ±±±±
±1±± 11±1
±1±1 1±±1
±ꢀC
±ꢀC
+11±ꢀC
+85ꢀC
+85ꢀC
1±ꢀC
—
Read remote (eꢁternal) eꢁtended temperature
Read local (internal) eꢁtended temperature
Read/write remote (eꢁternal) OVERT limit (MAX6648)
Read/write remote (eꢁternal) OVERT limit (MAX6692)
Read/write local (internal) OVERT limit
Overtemperature hysteresis
11h
RWOE
19h
RWOI
HYS
QUEUE
—
2±h
21h
22h
FEh
FFh
Fault queue
—
Read manufacture ID
—
—
Read revision ID
Table 6. Configuration-Byte Bit Assignments ꢀ03hꢁ
BIT
7 (MSB)
6
NAME
MASK
RUN
POR STATE
FUNCTION
Masks ALERT interrupts when set to 1.
±
±
±
Standby mode control bit; if set to 1, standby mode is initiated.
Reserved.
5 to ±
RFU
only at the 3 LSBs of this register, so the upper 5 bits
are don’t care bits, which should be set to zero. The
conversion rate tolerance is ±25% at any rate setting.
Slave Addresses
The MAX6648/MAX6692 have a fiꢁed address of 1±±1
1±±. The MAX6648/MAX6692 also respond to the
SMBus alert response slave address (see the Alert
Response Address section).
Valid A/D conversion results for both channels are avail-
able one total conversion time (125ms nominal, 156ms
maꢁimum) after initiating a conversion, whether conver-
sion is initiated through the RUN bit, one-shot com-
mand, or initial power-up. Changing the conversion rate
can also affect the delay until new results are available.
POR and UVLO
To prevent ambiguous power-supply conditions from
corrupting the data in memory and causing erratic
behavior, a POR voltage detector monitors V
and
CC
10 ______________________________________________________________________________________
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
Table 7. Status Register Bit Assignments ꢀ02hꢁ
POR
STATE
BIT
7 (MSB)
6
NAME
BUSY
FUNCTION
±
A/D is busy converting when 1.
Local (internal) high-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer eꢁists.
LHIGH
±
±
±
±
±
Local (internal) low-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer eꢁists.
5
4
3
2
LLOW
RHIGH
RLOW
FAULT
Remote (eꢁternal) high-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer eꢁists.
Remote (eꢁternal) low-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer eꢁists.
A 1 indicates DXN and DXP are either shorted or open; cleared by POR or readout of the status
byte if the fault condition no longer eꢁists.
1
±
EOT
IOT
±
±
A 1 indicates the remote (eꢁternal) junction temperature eꢁceeds the eꢁternal OVERT threshold.
A 1 indicates the local (internal) junction temperature eꢁceeds the internal OVERT threshold.
clears the memory if V
falls below 2.±V (typ). When
CC
CC
Table 8. Conversion-Rate Control Byte
ꢀ04hꢁ
power is first applied and V
rises above 2.±V (typ),
the logic blocks begin operating, although reads and
writes at V
levels below 3V are not recommended. A
comparator, the ADC UVLO comparator
CC
CONVERSION
RATE ꢀHzꢁ
DATA
second V
CC
prevents the ADC from converting until there is suffi-
cient headroom (V = 2.8V typ).
±±h
±1h
±.±625
CC
±.125
Power-Up Defaults
±2h
±.25
Power-up defaults include:
• Interrupt latch is cleared.
±3h
±.5
±4h
1
• ADC begins autoconverting at a 4Hz rate.
±5h
2
• Command byte is set to ±±h to facilitate quick local
temperature receive byte queries.
±6h
4
4
±7h
• Local (internal) T
• Local (internal) T
limit set to +85ꢀC.
limit set to ±ꢀC.
HIGH
LOW
±8h-FFh
Reserved
• Remote (eꢁternal) T
• Remote (eꢁternal) T
limit set to +85ꢀC.
limit set to ±ꢀC.
HIGH
LOW
Applications Information
Remote-Diode Selection
•
OVERT internal limit is set to +85ꢀC; every eꢁternal
limit is set to +11±ꢀC (MAX6648).
The MAX6648/MAX6692 can directly measure the die
temperature of CPUs and other ICs that have on-board
temperature-sensing diodes (see Typical Operating
Circuit), or they can measure the temperature of a dis-
crete diode-connected transistor.
•
OVERT limits are set to +85ꢀC (MAX6692).
Effect of Ideality Factor
The accuracy of the remote temperature measurements
depends on the ideality factor (n) of the remote “diode”
______________________________________________________________________________________ 11
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
(actually a transistor). The MAX6648/MAX6692 (not the
MAX6648Y/MAX6692Y) are optimized for n = 1.±±8,
which is the typical value for the Intel® Pentium® III and
the AMD Athlon MP model 6. If a sense transistor with a
different ideality factor is used, the output data is differ-
ent. Fortunately, the difference is predictable.
resistance of 3Ω. The series resistance contributes an
offset of:
°C
3Ω × ±.453
=1.36°C
Ω
Assume a remote-diode sensor designed for a nominal
The effects of the ideality factor and series resistance
are additive. If the diode has an ideality factor of 1.±±2
and series resistance of 3Ω, the total offset can be cal-
culated by adding error due to series resistance with
error due to ideality factor:
ideality factor n
is used to measure the tem-
NOMINAL
perature of a diode with a different ideality factor n .
1
The measured temperature T can be corrected using:
M
⎛
⎞
n
1
1.36ꢀC - 2.13ꢀC = -±.77ꢀC
T
= T
M
ACTUAL⎜
⎟
n
⎝
⎠
NOMINAL
for a diode temperature of +85ꢀC.
In this eꢁample, the effect of the series resistance and
the ideality factor partially cancel each other.
where temperature is measured in Kelvin.
As mentioned above, the nominal ideality factor of the
MAX6648/MAX6692 is 1.±±8. As an eꢁample, assume
you want to use the MAX6648/MAX6692 with a CPU
that has an ideality factor of 1.±±2.
For best accuracy, the discrete transistor should be a
small-signal device with its collector and base connect-
ed together. Table 9 lists eꢁamples of discrete transis-
tors that are appropriate for use with the MAX6648/
MAX6692.
48/MAX692
If the diode has no series resistance, the measured
data is related to the real temperature as follows:
Table 9. Remote-Sensor Transistor
Manufacturers
⎛
⎞
n
1.±±8
1.±±2
⎛
⎞
NOMINAL
T
= T
= T
= T (1.±±599)
M
⎜
⎝
⎟
⎠
ACTUAL
M
M
⎜
⎟
n
1
⎝
⎠
MANUFACTURER
Central Semiconductor (USA)
Rohm Semiconductor (USA)
Samsung (Korea)
MODEL NO.
CMPT39±4
SST39±4
For a real temperature of +85ꢀC (358.15 K), the mea-
sured temperature is +82.91ꢀC (356.±2 K), which is an
error of -2.13ꢀC.
KST39±4-TF
SMBT39±4
Effect of Series Resistance
Series resistance in a sense diode contributes addition-
al errors. For nominal diode currents of 1±µA and
1±±µA, change in the measured voltage is:
Siemens (Germany)
Note: Transistors must be diode connected (base shorted to
collector).
The transistor must be a small-signal type with a rela-
tively high forward voltage; otherwise, the A/D input
voltage range can be violated. The forward voltage at
the highest eꢁpected temperature must be greater than
±.25V at 1±µA, and at the lowest eꢁpected tempera-
ture, the forward voltage must be less than ±.95V at
1±±µA. Large power transistors must not be used.
Also, ensure that the base resistance is less than 1±±Ω.
Tight specifications for forward current gain (5± < ß
<15±, for eꢁample) indicate that the manufacturer has
good process controls and that the devices have con-
ΔV =R (1±±μA −1±μA) = 9±μA ×R
S
M
S
Since 1ꢀC corresponds to 198.6µV, series resistance
contributes a temperature offset of:
μV
9±
°C
Ω
= ±.453
μV
Ω
198.6
°C
sistent V characteristics.
BE
Assume that the diode being measured has a series
Operation with 45nm Substrate PNPs
Small transistor geometries and specialized processes
can affect temperature measurement accuracy.
Parasitic series resistance can be higher, which
increases the measured temperature value. Beta may
Intel and Pentium are registered trademarks of Intel Corp.
12 ______________________________________________________________________________________
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
be low enough to alter the effective ideality factor.
Good results can be obtained if the process is consis-
GND
tent and well behaved. For example, the curve shown
10MILS
in the Remote Temperature Error vs. 45nm Remote
Diode Temperature graph in the Typical Operating
Characteristics section shows the temperature mea-
surement error of the MAX6648/MAX6692 when used
with a typical 45nm CPU thermal diode. Note that the
error is effectively a simple +4°C offset.
10MILS
10MILS
DXP
MINIMUM
10MILS
DXN
GND
ADC Noise Filtering
The integrating ADC used has good noise rejection for
low-frequency signals such as 60Hz/120Hz power-sup-
ply hum. In noisy environments, high-frequency noise
reduction is needed for high-accuracy remote mea-
surements. The noise can be reduced with careful PCB
layout and proper external noise filtering.
Figure 4. Recommended DXP-DXN PC Traces
exhibits 3µV/°C, and takes about 200µV of voltage
error at DXP-DXN to cause a 1°C measurement
error. Adding a few thermocouples causes a negligi-
ble error.
High-frequency EMI is best filtered at DXP and DXN with
an external 2200pF capacitor. Larger capacitor values
can be used for added filtering, but do not exceed
3300pF because larger values can introduce errors due
to the rise time of the switched current source.
6) Use wide traces. Narrow traces are more inductive
and tend to pick up radiated noise. The 10mil widths
and spacing recommended in Figure 4 are not
absolutely necessary, as they offer only a minor
improvement in leakage and noise over narrow
traces. Use wider traces when practical.
PCB Layout
Follow these guidelines to reduce the measurement
error of the temperature sensors:
7) Add a 200Ω resistor in series with V
for best noise
CC
1) Place the MAX6648/MAX6692 as close as is practi-
cal to the remote diode. In noisy environments, such
as a computer motherboard, this distance can be
4in to 8in (typ). This length can be increased if the
worst noise sources are avoided. Noise sources
include CRTs, clock generators, memory buses, and
ISA/PCI buses.
filtering (see Typical Operating Circuit).
8) Copper cannot be used as an EMI shield; only fer-
rous materials such as steel work well. Placing a
copper ground plane between the DXP-DXN traces
and traces carrying high-frequency noise signals
does not help reduce EMI.
Twisted-Pair and Shielded Cables
Use a twisted-pair cable to connect the remote sensor
for remote-sensor distance longer than 8in, or in very
noisy environments. Twisted-pair cable lengths can be
between 6ft and 12ft before noise introduces excessive
errors. For longer distances, the best solution is a
shielded twisted pair like that used for audio micro-
phones. For example, Belden 8451 works well for dis-
tances up to 100ft in a noisy environment. At the
device, connect the twisted pair to DXP and DXN and
the shield to GND. Leave the shield unconnected at the
remote sensor.
2) Do not route the DXP-DXN lines next to the deflec-
tion coils of a CRT. Also, do not route the traces
across fast digital signals, which can easily intro-
duce 30°C error, even with good filtering.
3) Route the DXP and DXN traces in parallel and in
close proximity to each other, away from any higher
voltage traces, such as 12V DC. Leakage currents
from PCB contamination must be dealt with carefully
since a 20MΩ leakage path from DXP to ground
causes about 1°C error. If high-voltage traces are
unavoidable, connect guard traces to GND on either
side of the DXP-DXN traces (Figure 4).
For very long cable runs, the cable’s parasitic capaci-
tance often provides noise filtering, so the 2200pF
capacitor can often be removed or reduced in value.
Cable resistance also affects remote-sensor accuracy.
For every 1Ω of series resistance, the error is approxi-
mately 0.5°C.
4) Route through as few vias and crossunders as pos-
sible to minimize copper/solder thermocouple
effects.
5) When introducing a thermocouple, make sure that
both the DXP and the DXN paths have matching
thermocouples. A copper-solder thermocouple
______________________________________________________________________________________ 13
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
Functional Diagram
V
CC
MAX6648
MAX6692
2
DXP
DXN
MUX
REMOTE
CONTROL
LOGIC
ADC
LOCAL
DIODE
FAULT
SMBus
8
8
SMBDATA
SMBCLK
READ
ALERT
OVERT
S
R
48/MAX692
WRITE
7
Q
Q
REGISTER BANK
COMMAND BYTE
REMOTE TEMPERATURE
LOCAL TEMPERATURE
ALERT THRESHOLD
ADDRESS
DECODER
S
R
ALERT RESPONSE ADDRESS
OVERT THRESHOLD
and ensure that stray air currents across the sensor
package do not interfere with measurement accuracy.
Thermal Mass and Self-Heating
When sensing local temperature, these devices are
intended to measure the temperature of the PCB to
which they are soldered. The leads provide a good ther-
mal path between the PCB traces and the die. Thermal
conductivity between the die and the ambient air is poor
by comparison, making air temperature measurements
impractical. Because the thermal mass of the PCB is far
greater than that of the MAX6648/MAX6692, the devices
follow temperature changes on the PCB with little or no
perceivable delay.
When measuring the temperature of a CPU or other IC
with an on-chip sense junction, thermal mass has virtu-
ally no effect; the measured temperature of the junction
tracks the actual temperature within a conversion cycle.
When measuring temperature with discrete remote sen-
sors, smaller packages, such as SOT23s, yield the best
thermal response times. Take care to account for ther-
mal gradients between the heat source and the sensor,
Self-heating does not significantly affect measurement
accuracy. Remote-sensor self-heating due to the diode
current source is negligible. For the local diode, the
worst-case error occurs when autoconverting at the
fastest rate and simultaneously sinking maꢁimum current
at the ALERT output. For eꢁample, with V
= 5.±V, at a
CC
4Hz conversion rate and with ALERT sinking 1mA, the
typical power dissipation is:
5.±V ꢁ 5±±µA + ±.4V ꢁ 1mA = 2.9mW
θ
for the 8-pin µMAX package is about +221ꢀC/W,
J-A
so assuming no copper PCB heat sinking, the resulting
temperature rise is:
ΔT = 2.9mW ꢁ (+221ꢀC/W) = +±.64±9ꢀC
Even under nearly worst-case conditions, it is difficult to
introduce a significant self-heating error.
14 ______________________________________________________________________________________
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
48/MAX692
Pin Configuration
Chip Information
PROCESS: BiCMOS
TOP VIEW
V
1
2
3
4
8
7
6
5
SCLK
SDA
CC
DXP
DXN
Package Information
MAX6648
MAX6692
ALERT
GND
For the latest package outline information and land patterns, go
OVERT
to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
μMAX/SO*
8 µMAX
8 SO
U8-1
S8-4
21-0036
21-0041
*SO PACKAGE AVAILABLE FOR MAX6692 ONLY.
______________________________________________________________________________________ 15
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
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1
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3
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11/±5
12/±7
6/±8
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Changed maꢁ SMBus timeout from 45 to 55; and various style edits.
Updated to include 4nm CPU compatibility.
3, 8, 13, 14
1, 5, 12, 15
48/MAX692
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implied. Maꢁim reserves the right to change the circuitry and specifications without notice at any time.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2±±8 Maꢁim Integrated Products
is a registered trademark of Maꢁim Integrated Products, Inc.
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