|NE1617A(2009)||Temperature monitor for microprocessor systems|
|NE1617A Datasheet PDF : 27 Pages |
Temperature monitor for microprocessor systems
Rev. 04 — 30 July 2009
Product data sheet
1. General description
The NE1617A is an accurate two-channel temperature monitor. It measures the
temperature of itself and the temperature of a remote sensor. The remote sensor is a
diode connected transistor. This can be in the form of either a discrete NPN/PNP, such as
the 2N3904/2N3906, or a diode connected PNP built into another die, such as is done on
some Intel microprocessors.
The temperature of both the remote and local sensors is stored in a register that can be
read via a 2-wire SMBus. The temperatures are updated at a rate that is programmable
via the SMBus (the average supply current is dependent upon the update rate—the faster
the rate, the higher the current).
In addition to the normal operation, which is to update the temperature at the programmed
rate, there is a one-shot mode that will force a temperature update.
There is also an alarm that senses either an overtemperature or undertemperature
condition. The trip points for this alarm are also programmable.
The device can have 1 of 9 addresses (determined by 2 address pins), so there can be up
to 9 of the NE1617A on the SMBus.
It can also be put in standby mode (in order to save power). This can be done either with
software (over the SMBus) or with hardware (using the STBY pin).
I Replacement for Maxim MAX1617 and Analog Devices ADM1021
I Monitors local and remote temperature
I Local (on-chip) sensor accuracy:
N ±2 °C at 60 °C to 100 °C
N ±3 °C at −40 °C to 125 °C
I Remote sensor accuracy:
N ±3 °C at 60 °C to 100 °C
N ±5 °C at −40 °C to 125 °C
I No calibration required
I Programmable overtemperature/undertemperature alarm
I SMBus 2-wire serial interface up to 100 kHz
I 3 V to 5.5 V supply range; 5.5 V tolerant
I 70 µA supply current in operating mode
I 3 µA (typical) supply current in standby mode
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