Datasheet ADT7461A (ON Semiconductor)

link to page 18 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
http://onsemi.com
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,
MSOP−8
switchable temperature measurement range.
CASE 846AB
The ADT7461A can measure the temperature of a remote thermal diode accurate to ±1°C and the ambient temperature accurate to ±3°C.
PIN ASSIGNMENT
The temperature measurement range defaults to 0°C to +127°C, compatible with the ADM1032, but it can be switched to a wider VDD 1 8 SCLK measurement range of −64°C to +191°C. D+ 2 7 SDATA The ADT7461A communicates over a 2-wire serial interface, D− 3 6 ALERT/THERM2 compatible with system management bus (SMBus) standards. The THERM 4 5 GND 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 (Top View) ADT7461A is used on the same SMBus. An ALERT output signals when the on-chip or remote temperature is
MARKING DIAGRAM
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 8 as a second THERM output, if required. T1x
Features
AYWG • On-Chip and Remote Temperature Sensor G • 0.25°C Resolution/1°C Accuracy on Remote Channel 1 • 1°C Resolution/1°C Accuracy on Local Channel • Automatically Cancels Up to 1.5 kW (Typ) of Resistance in Series T1x = Refer to Ordering Information Table with Remote Diode to Allow Noise Filtering A = Assembly Location • Extended, Switchable Temperature Measurement Range Y = Year 0°C to +127°C (Default) or –64°C to +191°C W = Work Week • G = Pb-Free Package Pin- and Register-Compatible with ADM1032 and ADT7461 • 2-wire SMBus Serial Interface with SMBus Alert Support (Note: Microdot may be in either location) • Programmable Over/Undertemperature Limits •
ORDERING INFORMATION
Offset Registers for System Calibration • See detailed ordering and shipping information in the package Up to Two Overtemperature Fail-Safe THERM Outputs dimensions section on page 18 of this data sheet. • Small 8-lead MSOP • 240 mA Operating Current, 5 mA Standby Current • These are Pb-Free Devices*
Applications
• Desktop and Notebook Computers • Embedded Systems • Industrial Controllers • Burn-In Applications • Smart Batteries • Instrumentation • Automotive * For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. © Semiconductor Components Industries, LLC, 2013
1
Publication Order Number:
April, 2013 − Rev. 8 ADT7461A/D