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ADT7461AARMZ-002

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
© Semiconductor Components Industries, LLC, 2009
October, 2009 − Rev. 5
1 Publication Order Number:
ADT7461A/D
ADT7461A
+15C Temperature Monitor
with Series Resistance
Cancellation
The ADT7461A is a dual−channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in PCs and
thermal management systems. It is pin− and register−compatible with the
ADM1032 and ADT7461. A feature of the ADT7461A is series
resistance cancellation, where up to 1.5 kW (typical) of resistance in
series with the temperature monitoring diode can be automatically
cancelled from the temperature result, allowing noise filtering. The
ADT7461A has a configurable ALERT
output and an extended,
switchable temperature measurement range.
The ADT7461A can measure the temperature of a remote thermal
diode accurate to ±1°C and the ambient temperature accurate to ±3°C.
The temperature measurement range defaults to 0°C to +127°C,
compatible with the ADM1032, but it can be switched to a wider
measurement range of −64°C to +191°C.
The ADT7461A communicates over a 2−wire serial interface,
compatible with system management bus (SMBus) standards. The
default SMBus address of the ADT7461A is 0x4C. An ADT7461A−2 is
available with an SMBus address of 0x4D. This is useful if more than one
ADT7461A is used on the same SMBus.
An ALERT
output signals when the on−chip or remote temperature is
out of range. The THERM
output is a comparator output that allows
on/off control of a cooling fan. The ALERT
output can be reconfigured
as a second THERM
output, if required.
Features
• On−Chip and Remote Temperature Sensor
• 0.25°C Resolution/1°C Accuracy on Remote Channel
• 1°C Resolution/1°C Accuracy on Local Channel
• Automatically Cancels Up to 1.5 kW (Typ) of Resistance in Series
with Remote Diode to Allow Noise Filtering
• Extended, Switchable Temperature Measurement Range
0°C to +127°C (Default) or –64°C to +191°C
• Pin− and Register−Compatible with ADM1032 and ADT7461
• 2−Wire SMBus Serial Interface with SMBus Alert Support
• Programmable Over/Undertemperature Limits
• Offset Registers for System Calibration
• Up to Two Overtemperature Fail−Safe THERM Outputs
• Small 8−Lead MSOP
• 240 mA Operating Current, 5 mA Standby Current
• These are Pb−Free Devices
Applications
• Desktop and Notebook Computers
• Industrial Controllers
• Smart Batteries
• Automotive
• Embedded Systems
• Burn−In Applications
• Instrumentation
MARKING DIAGRAM
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PIN ASSIGNMENT
V
DD
D+
D–
GND
ALERT/THERM2
THERM
1
2
3
4
8
7
6
5
(Top View)
SCLK
SDATA
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
ORDERING INFORMATION
MSOP−8
CASE 846AB
T1x = Refer to Order Info Table
R = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
1
(Note: Microdot may be in either location)
1
8
T1x
RYWG
G
ADT7461A
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2
Figure 1. Functional Block Diagram
A−TO−D
CONVERTER
RUN/STANDBYBUSY
REMOTE OFFSET
REGISTER
LIMIT
COMPARATOR
STATUS REGISTER
INTERRUPT
MASKING
REMOTE TEMPERATURE
VALUE REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
ON−CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
EXTERNAL DIODE OPEN−CIRCUIT
SMBus INTERFACEADT7461A
3
2
8
4
1 57
V
DD
GND SDATA SCLK
THERM
6
D+
D–
ALERT/THERM2
DIGITAL MUX
CONFIGURATION
REGISTERS
EXTERNAL THERM LIMIT
REGISTERS
LOCAL THERM LIMIT
REGISTERS
REMOTE TEMPERATURE
HIGH−LIMIT REGISTER
REMOTE TEMPERATURE
LOW−LIMIT REGISTER
LOCAL TEMPERATURE
HIGH−LIMIT REGISTER
LOCAL TEMPERATURE
LOW−LIMIT REGISTER
CONVERSION RATE
REGISTER
ADDRESS POINTER
REGISTER
DIGITAL MUX
ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
Positive Supply Voltage (V
DD
) to GND −0.3, +3.6 V
D+ −0.3 to V
DD
+ 0.3 V
D− to GND −0.3 to +0.6 V
SCLK, SDATA, ALERT, THERM −0.3 to +3.6 V
Input Current, SDATA, THERM −1, +50 mA
Input Current, D− ±1 mA
ESD Rating, All Pins (Human Body Model) 1500 V
Maximum Junction Temperature (T
J
Max) 150 °C
Storage Temperature Range −65 to +150 °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
q
JA
q
JC
Unit
8−Lead MSOP 142 43.74 °C/W
ADT7461A
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3
PIN ASSIGNMENT
Pin No. Mnemonic Description
1 V
DD
Positive Supply, 3.0 V to 3.6 V.
2 D+ Positive Connection to Remote Temperature Sensor.
3 D− Negative Connection to Remote Temperature Sensor.
4 THERM Open−Drain Output. Can be used to turn a fan on/off or throttle a CPU clock in the event of an
overtemperature condition. Requires pullup resistor.
5 GND Supply Ground Connection.
6 ALERT/THERM2 Open−Drain Logic Output Used as Interrupt or SMBus ALERT. This can also be configured as a
second THERM
output. Requires pullup resistor.
7 SDATA Logic Input/Output, SMBus Serial Data. Open−Drain Output. Requires pullup resistor.
8
SCLK Logic Input, SMBus Serial Clock. Requires pullup resistor.
SMBus TIMING SPECIFICATIONS (Note 1)
Parameter
Limit at T
MIN
and T
MAX
Unit Description
f
SCLK
400 kHz max −
t
LOW
1.3
ms min
Clock low period, between 10% points.
t
HIGH
0.6
ms min
Clock high period, between 90% points.
t
R
300 ns max Clock/data rise time.
t
F
300 ns max Clock/data fall time.
t
SU;
STA
600 ns min Start condition setup time.
t
HD;
STA
(Note 2) 600 ns min Start condition hold time.
t
SU;
DAT
(Note 3) 100 ns min Data setup time.
t
SU;
STO
(Note 4) 600 ns min Stop condition setup time.
t
BUF
1.3
ms min
Bus free time between stop and start conditions.
1. Guaranteed by design, but not production tested.
2. Time from 10% of SDATA to 90% of SCLK.
3. Time for 10% or 90% of SDATA to 10% of SCLK.
4. Time for 90% of SCLK to 10% of SDATA.
Figure 2. Serial Bus Timing
SCLK
SDATA
t
R
t
F
t
LOW
t
HD;DAT
t
HD;STA
t
HIGH
t
SU;DAT
STOP START STOPSTART
t
SU;STA
t
SU;STO
t
HD;STA
t
BUF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

ADT7461AARMZ-002

Mfr. #:
Buy ADT7461AARMZ-002
Manufacturer:
ON Semiconductor
Description:
SENSOR DIGITAL -40C-120C MICRO8
Lifecycle:
New from this manufacturer.
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