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ADT7461AARMZ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
© Semiconductor Components Industries, LLC, 2013
April, 2013 − Rev. 8
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
* For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
MARKING DIAGRAM
http://onsemi.com
PIN ASSIGNMENT
(Top View)
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 Ordering Information Table
A = Assembly Location
Y = Year
W = Work Week
G = Pb-Free Package
(Note: Microdot may be in either location)
1
8
T1x
AYWG
G
SCLK
SDATA
ALERT
/THERM2
GND
D+
D−
THERM
V
DD
8
7
6
5
1
2
3
4
ADT7461A
http://onsemi.com
2
Figure 1. Functional Block Diagram
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
BUSY
A-TO-D
CONVERTER
LOCAL TEMPERATURE
VALUE REGISTER
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
RUN/STANDBY
EXTERNAL DIODE OPEN-CIRCUIT
STATUS REGISTER
SMBUS INTERFACE
LIMIT
COMPARATOR
DIGITAL MUX
DIGITAL MUX
INTERRUPT
MASKING
SDATA SCLK
87
ADDRESS POINTER
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
LOW-LIMIT REGISTER
LOCAL TEMPERATURE
HIGH-LIMIT REGISTER
REMOTE TEMPERATURE
LOW-LIMIT REGISTER
REMOTE TEMPERATURE
HIGH-LIMIT REGISTER
LOCAL THERM
LIMIT
REGISTER
EXTERNAL THERM
LIMIT
REGISTER
CONFIGURATION
REGISTER
4
6
GND
5
V
DD
1
3
2
ADT7461A
D+
D−
ALERT
/
THERM2
THERM
Table 1. 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.
Table 2. THERMAL CHARACTERISTICS
Package Type
q
JA
q
JC
Unit
8-Lead MSOP 142 43.74 °C/W
ADT7461A
http://onsemi.com
3
Table 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.
Table 4. 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
STOPSTART
t
SU; DAT
t
HIGH
t
F
t
HD; DAT
t
R
t
LOW
t
SU; STO
STOP START
SCLK
SDATA
t
BUF
t
HD; STA
t
HD; STA
t
SU; STA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

ADT7461AARMZ-REEL

Mfr. #:
Buy ADT7461AARMZ-REEL
Manufacturer:
ON Semiconductor
Description:
SENSOR DIGITAL -40C-120C MICRO8
Lifecycle:
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