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ADT7461ARMZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
© Semiconductor Components Industries, LLC, 2014
March, 2014 − Rev. 8
1 Publication Order Number:
ADT7461/D
ADT7461
+15C Temperature Monitor
with Series Resistance
Cancellation
The ADT7461 is a dual-channel digital thermometer and under/over
temperature alarm intended for use in PCs and thermal management
systems. It is pin- and register-compatible with the ADM1032. The
ADT7461 has three additional features: series resistance cancellation
(where up to 3 kW (typical) of resistance in series with the temperature
monitoring diode may be automatically cancelled from the temperature
result, allowing noise filtering); configurable ALERT
output; and an
extended, switchable temperature measurement range. The ADT7461
can accurately measure the temperature of a remote thermal diode to
±1°C and the ambient temperature to ±3°C. The temperature
measurement range defaults to 0°C to +127°C, compatible with the
ADM1032, but can be switched to a wider measurement range of −55°C
to +150°C. The ADT7461 communicates over a 2-wire serial interface
compatible with system management bus (SMBus) standards. 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.
The SMBus address of the ADT7461 is 0x4C. An ADT7461-2 is also
available, which uses SMBus Address 0x4D.
Features
• On-Chip and Remote Temperature Sensor
• 0.25°C Resolution/1°C Accuracy on Remote Channel
• 1°C Resolution/3°C Accuracy on Local Channel
• Automatically Cancels Up to 3 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 –55°C to +150°C
• Pin- and Register-Compatible with the ADM1032
• 2-wire SMBus Serial Interface with SMBus Alert Support
• Two SMBus Address Versions Available:
♦ ADT7461 SMBus Address is 0x4C
♦ ADT7461-2 SMBus Address is 0x4D
• Programmable Over/Undertemperature Limits
• Offset Registers for System Calibration
• Up to Two Overtemperature Fail−Safe THERM Outputs
• Small 8-lead SOIC NB or 8-lead MSOP Packages
• 170 mA Operating Current, 5.5 mA Standby Current
• These are Pb-Free Devices*
Applications
• Desktop and Notebook Computers
• Industrial Controllers
• Smart Batteries
• Embedded Systems
• 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 DIAGRAMS
http://onsemi.com
PIN ASSIGNMENT
SOIC−8 NB
CASE 751
ADT74
61A
#YWW
1
8
ADT7461A = Specific Device Code
# = Pb-Free Package
Y = Year
W = Work Week
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
ORDERING INFORMATION
T1x = Refer to Order Info 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
MSOP8
CASE 846AB
(Top View)
SCLK
SDATA
ALERT
/THERM2
GND
D+
D−
THERM
V
DD
8
7
6
5
1
2
3
4
SOIC−8
MSOP8
ADT7461
http://onsemi.com
2
Figure 1. Functional Block Diagram
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
BUSY
ADC
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
ADT7461
D+
D−
ALERT
/
THERM2
THERM
SRC
BLOCK
3
2
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
Positive Supply Voltage (V
DD
) to GND −0.3, +5.5 V
D+ −0.3 to V
DD
+ 0.3 V
D− to GND −0.3 to +0.6 V
SCLK, SDATA, ALERT −0.3 to +5.5 V
THERM −0.3 to V
DD
+ 0.3 V
Input Current, SDATA, THERM −1, +50 mA
Input Current, D− ±1 mA
ESD Rating, All Pins (Human Body Model) 2000 V
Maximum Junction Temperature (T
J
Max) 150 °C
Storage Temperature Range −65 to +150 °C
IR Reflow Peak Temperature 220 °C
IR Reflow Peak Temperature for Pb-Free 260 (±0.5) °C
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.
Table 2. THERMAL CHARACTERISTICS
Package Type
q
JA
Unit
8-lead SOIC NB Package 121 °C/W
8-lead MSOP Package 142 °C/W
ADT7461
http://onsemi.com
3
Table 3. PIN ASSIGNMENT
Pin No. Mnemonic Description
1 V
DD
Positive Supply, 3.0 V to 5.5 V.
2 D+ Positive Connection to Remote Temperature Sensor.
3 D− Negative Connection to Remote Temperature Sensor.
4 THERM Open-Drain output that can be used to turn a fan on/off or throttle a CPU clock in the event of an
overtemperature condition. Requires pullup to V
DD
.
5 GND Supply Ground Connection.
6 ALERT/THERM2 Open-Drain Logic Output Used as Interrupt or SMBus Alert. This may 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
HD;
DAT
300 ns min Data hold 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-P20

ADT7461ARMZ-REEL7

Mfr. #:
Buy ADT7461ARMZ-REEL7
Manufacturer:
ON Semiconductor
Description:
SENSOR DIGITAL -40C-120C MICRO8
Lifecycle:
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