ADT7481ARMZ-1R7 [ONSEMI]

Dual Channel Temperature Sensor and Overtemperature Alarm; 双通道温度传感器和超温报警
ADT7481ARMZ-1R7
元器件型号: ADT7481ARMZ-1R7
生产厂家: ON SEMICONDUCTOR    ON SEMICONDUCTOR
描述和应用:

Dual Channel Temperature Sensor and Overtemperature Alarm
双通道温度传感器和超温报警

传感器换能器温度传感器输出元件
PDF文件: 总20页 (文件大小:253K)
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型号参数:ADT7481ARMZ-1R7参数
Brand NameON Semiconductor
是否无铅 不含铅
生命周期Obsolete
包装说明LEAD FREE, MSOP-10
针数10
制造商包装代码846B
Reach Compliance Codeunknown
风险等级5.17
最大精度(摄氏度)2.5 Cel
其他特性HYSTERESIS IS 0.5V
主体宽度3 mm
主体高度1.025 mm
主体长度或直径3 mm
外壳PLASTIC
JESD-609代码e3
安装特点SURFACE MOUNT
位数8
端子数量10
最大工作电流4 mA
最高工作温度120 °C
最低工作温度
输出接口类型2-WIRE INTERFACE
封装主体材料PLASTIC/EPOXY
封装等效代码TSSOP10,.19,20
封装形状/形式SQUARE
电源3.3 V
传感器/换能器类型TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL
子类别Other Sensors
最大供电电压3.6 V
最小供电电压3 V
表面贴装YES
端子面层Tin (Sn)
端接类型SOLDER
Base Number Matches1
MAX34334CSE前5页PDF页面详情预览
ADT7481
Dual Channel Temperature
Sensor and Overtemperature
Alarm
The ADT7481 is a 3−channel digital thermometer and under/ over
temperature alarm, intended for use in PCs and thermal management
systems. It can measure its own ambient temperature or the
temperature of two remote thermal diodes. These thermal diodes can
be located in a CPU or GPU, or they can be discrete diode connected
transistors. The ambient temperature, or the temperature of the remote
thermal diode, can be accurately measured to
±1°C.
The temperature
measurement range defaults to 0°C to +127°C, compatible with
ADM1032, but can be switched to a wider measurement range from
−64°C
to +191°C.
The ADT7481 communicates over a 2−wire serial interface
compatible with System Management Bus (SMBus) standards. The
SMBus address of the ADT7481 is 0x4C. An ADT7481−1 with an
SMBus address of 0x4B is also available.
An ALERT output signals when the on−chip or remote temperature
is outside the programmed limits. The THERM output is a comparator
output that allows, for example, on/off control of a cooling fan. The
ALERT output can be reconfigured as a second THERM output if
required.
Features
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MSOP−10
CASE 846AC
MARKING DIAGRAM
10
T0x
AYWG
G
1
T0x
A
Y
W
G
= Refer to Ordering Info Table
= Assembly Location
= Year
= Work Week
= Pb−Free Package
1 Local and 2 Remote Temperature Sensors
0.25°C Resolution/1°C Accuracy on Remote Channels
1°C Resolution/1°C Accuracy on Local Channel
Extended, Switchable Temperature Measurement Range
0°C to 127°C (Default) or
−64°C
to +191°C
2−Wire SMBus Serial Interface with SMBus ALERT Support
Programmable Over/Undertemperature Limits
Offset Registers for System Calibration
Up to 2 Overtemperature Fail−Safe THERM Outputs
Small 10−Lead MSOP Package
240
mA
Operating Current, 5
mA
Standby Current
These are Pb−Free Devices
(Note: Microdot may be in either location)
PIN ASSIGNMENT
V
DD 1
D1+
2
D1–
3
THERM
4
GND
5
10
9
SCLK
SDATA
ALERT/THERM2
D2+
D2−
ADT7481
8
7
6
Applications
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
Desktop and Notebook Computers
Industrial Controllers
Smart Batteries
Automotive
Embedded Systems
Burn−In Applications
Instrumentation
©
Semiconductor Components Industries, LLC, 2010
June, 2010
Rev. 5
1
Publication Order Number:
ADT7481/D
ADT7481
ADDRESS POINTER
REGISTER
ONE−SHOT
REGISTER
ON−CHIP TEMP
SENSOR
D1+
2
D1–
3
D2+
7
D2–
8
ANALOG
MUX
11−BIT A−TO−D
CONVERTER
BUSY
RUN/STANDBY
REMOTE 1 AND 2 TEMP
VALUE REGISTERS
REMOTE 1 AND 2 TEMP
OFFSET REGISTERS
CONVERSION RATE
REGISTER
LIMIT COMPARATOR
LOCAL TEMPERATURE
VALUE REGISTER
DIGITAL MUX
LOCAL TEMPERATURE
THERM LIMIT REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE 1 AND 2 TEMP
THERM LIMIT REGISTER
REMOTE 1 AND 2 TEMP
LOW LIMIT REGISTERS
REMOTE 1 AND 2 TEMP
HIGH LIMIT REGISTERS
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
8
ALERT/THERM2
EXTERNAL DIODES OPEN−CIRCUIT
STATUS REGISTERS
ADT7481
1
6
SMBUS INTERFACE
9
10
4
V
DD
GND
SDATA
SCLK
THERM
Figure 1. Functional Block Diagram
ABSOLUTE MAXIMUM RATINGS
Parameter
Positive Supply Voltage (V
DD
) to GND
D+
D− to GND
SCLK, SDATA, ALERT, THERM
Input Current, SDATA, THERM
Input Current, D−
ESD Rating, All Pins (Human Body Model)
Maximum Junction Temperature (T
J
max)
Storage Temperature Range
IR Reflow Peak Temperature
IR Reflow Peak Temperature for Pb−Free
Rating
−0.3
to +3.6
−0.3
to V
DD
+ 0.3
−0.3
to +0.6
Unit
V
V
V
V
mA
mA
V
°C
°C
°C
°C
−0.3
to +3.6
−1
to +50
±1
1500
150
−65
to +150
220
260
Lead Temperature, Soldering (10 sec)
300
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.
THERMAL CHARACTERISTICS
Package Type
10−Lead MSOP
q
JA
142
q
JC
43.74
Unit
°C/W
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ADT7481
PIN ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
8
9
10
Mnemonic
V
DD
D1+
D1−
THERM
GND
D2−
D2+
ALERT/THERM2
SDATA
SCLK
Positive Supply, 3.0 V to 3.6 V.
Positive Connection to the Remote 1 Temperature Sensor.
Negative Connection to the Remote 1 Temperature Sensor.
Open−Drain Output. Requires pullup resistor. Signals overtemperature events, could be used to turn a
fan on/off, or throttle a CPU clock.
Supply Ground Connection.
Negative Connection to the Remote 2 Temperature Sensor.
Positive Connection to the Remote 2 Temperature Sensor.
Open−Drain Logic Output. Used as interrupt or SMBALERT. This may also be configured as a second
THERM output. Requires pullup resistor.
Logic Input/Output, SMBus Serial Data. Open−Drain Output. Requires pullup resistor.
Logic Input, SMBus Serial Clock. Requires pullup resistor.
Description
TIMING SPECIFICATIONS
(Note 1)
Parameter
f
SCLK
t
LOW
t
HIGH
t
R
t
F
t
SU; STA
t
HD; STA
(Note 2)
t
SU; DAT
(Note 3)
t
SU; STO
(Note 4)
t
BUF
1.
2.
3.
4.
Limit at T
MIN
and T
MAX
400
4.7
4.0
1.0
300
4.7
4.0
250
4.0
4.7
Unit
kHz max
ms
min
ms
min
ms
max
ns max
ms
min
ms
min
ns min
ms
min
ms
min
Clock low period, between 10% points
Clock high period, between 90% points
Clock/data rise time
Clock/data fall time
Start condition setup time
Start condition hold time
Data setup time
Stop condition setup time
Bus free time between stop and start conditions
Description
Guaranteed by design, not production tested.
Time from 10% of SDATA to 90% of SCLK.
Time for 10% or 90% of SDATA to 10% of SCLK.
Time for 90% of SCLK to 10% of SDATA.
t
LOW
SCLK
t
R
t
F
t
HD;STA
t
HD;STA
t
HD;DAT
SDATA
t
HIGH
t
SU;DAT
t
SU;STA
t
SU;STO
t
BUF
STOP START
START
STOP
Figure 2. Serial Bus Timing
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ADT7481
ELECTRICAL CHARACTERISTICS
(T
A
=
−40°C
to +120°C, V
DD
= 3.0 V to 3.6 V, unless otherwise noted)
Parameter
Power Supply
Supply Voltage, V
DD
Average Operating Supply Current, I
DD
Undervoltage Lockout Threshold
Power−On−Reset Threshold
Temperature−To−Digital Converter
Local Sensor Accuracy (Note 2)
0°C
T
A
+70°C
0°C
T
A
+85°C
−40
T
A
+100°C
1.0
0°C
T
A
+70°C,
−55°C
T
D
(Note 3)
+150°C
0°C
T
A
+85°C,
−55°C
T
D
(Note 3)
+150°C
−40°C
T
A
+100°C,
−55°C
T
D
(Note 3)
+150°C
0.25
High level (Note 4)
Low level (Note 4)
Conversion Time
From stop bit to conversion complete (both channels)
one−shot mode with averaging switched on
One−shot mode with averaging off (conversion
rate = 16, 32, or 64 conversions per second)
Open−Drain Digital Outputs (THERM, ALERT/THERM2)
Output Low Voltage, V
OL
High Level Output Leakage Current, I
OH
SMBus Interface
(Notes 4 and 5)
Logic Input High Voltage, V
IH
SCLK, SDATA
Logic Input Low Voltage, V
IL
SCLK, SDATA
Hysteresis
SDA Output Low Voltage, V
OL
Logic Input Current, I
IH
, I
IL
SMBus Input Capacitance,
SCLK, SDATA
SMBus Clock Frequency
SMBus Timeout (Note 6)
SCLK Falling Edge to SDATA Valid Time
1.
2.
3.
4.
5.
6.
User programmable
Master clocking in data
25
I
OUT
=
−6.0
mA
−1.0
5.0
400
32
1.0
500
0.4
+1.0
2.1
0.8
V
V
mV
V
mA
pF
kHz
ms
ms
I
OUT
=
−6.0
mA
V
OUT
= V
DD
0.1
0.4
1.0
V
mA
233
14
73
11
94
14
±1
±1.5
±2.5
±1
±1.5
±2.5
°C
0.0625 Conversions/Sec Rate (Note 1)
Standby mode
V
DD
input, disables ADC, rising edge
1.0
3.0
3.30
3.0
5.0
2.55
2.5
3.6
4.0
30
V
mA
mA
V
V
Conditions
Min
Typ
Max
Unit
Resolution
Remote Diode Sensor Accuracy (Note 2)
°C
°C
Resolution
Remote Sensor Source Current
°C
mA
mA
ms
ms
See Table 6 for information on other conversion rates.
Averaging enabled.
Guaranteed by characterization, not production tested.
Guaranteed by design, not production tested.
See Timing Specifications section for more information.
Disabled by default. See the Serial Bus Interface section for details to enable it.
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ADT7481
TYPICAL CHARACTERISTICS
3.5
3.0
2.5
TEMPERATURE ERROR
2.0
1.5
1.0
0.5
0
0.5
–1.0
–50
DEV 1
DEV 2
DEV 3
DEV 4
DEV 5
DEV 6
DEV 7
DEV 8
DEV 9
DEV 10
DEV 11
DEV 12
DEV 13
DEV 14
DEV 15
DEV 16
MEAN
HIGH 4S
LOW 4S
3.5
3.0
2.5
TEMPERATURE ERROR
2.0
1.5
1.0
0.5
0
0.5
0
50
TEMPERATURE (5C)
100
150
–1.0
–50
0
50
TEMPERATURE (5C)
100
150
DEV 1
DEV 2
DEV 3
DEV 4
DEV 5
DEV 6
DEV 7
DEV 8
DEV 9
DEV 10
DEV 11
DEV 12
DEV 13
DEV 14
DEV 15
DEV 16
HIGH 4S
LOW 4S
Figure 3. Local Temperature Error vs. Temperature
Figure 4. Remote 1 Temperature Error vs.
Temperature
10
5
TEMPERATURE ERROR (5C)
D+ TO GND
3.5
3.0
2.5
TEMPERATURE ERROR
2.0
1.5
1.0
0.5
0
0.5
–1.0
–50
DEV 1
DEV 2
DEV 3
DEV 4
DEV 5
DEV 6
DEV 7
DEV 8
DEV 9
DEV 10
DEV 11
DEV 12
DEV 13
DEV 14
DEV 15
DEV 16
MEAN
HIGH 4S
LOW 4S
D+ TO V
CC
–10
–15
–20
–25
0
50
TEMPERATURE (5C)
100
150
1
10
LEAKAGE RESISTANCE (MΩ)
100
Figure 5. Remote 2 Temperature Error vs.
Temperature
Figure 6. Temperature Error vs. D+/D− Leakage
Resistance
0
–2
TEMPERATURE ERROR (5C)
–4
–6
I
DD
(μA)
1000
900
800
700
600
500
400
300
200
100
0
5
10
15
20
25
0
0.01
0.1
1
CONVERTION RATE (Hz)
10
100
DEV 4BC
DEV 2BC
–12
ć14
ć16
DEV 3
DEV 2
DEV 4
DEV 3BC
–18
CAPACITANCE (nF)
Figure 7. Temperature Error vs. D+/D− Capacitance
Figure 8. Operating Supply Current vs.
Conversion Rate
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