AMC80 Datasheet, PDF (12/23 Pages) Texas Instruments – System Hardware Monitor with Two-Wire/SMBus Serial Interface

AMC80
SBOS559 – MAY 2011
APPLICATION INFORMATION
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DEVICE POWER-ON
The AMC80 undergoes a power-on-reset condition when power is first applied to the device, or when the
Configuration Register INITIALIZATION bit (address 00h, bit 7) is set high; this bit automatically clears after
being set. The AMC80 can also be forced to a reset condition by taking the NTEST_IN/RESET_IN pin low for at
least 50 ns.
To start the AMC80 monitoring functions (temperature, analog inputs, and fan speeds), write to the Configuration
Register with a '0' to INT_Clear (bit 3) and a '1' to Start (bit 0). The AMC80 then performs continuous monitoring
of all temperature, analog inputs, and fan speeds. The sequence of items that are monitored (except for the
temperature reading) corresponds to locations in the Value RAM, respectively:
1. Temperature
2. CH0
3. CH1
4. CH2
5. CH3
6. CH4
7. CH5
8. CH6
9. Fan 1
10. Fan 2
The conversion results are available in the Value RAM (addresses 20h to 29h). Conversions can be read at any
time and provide the result of the last conversion. A typical sequence of events after AMC80 power-on consists
of these actions:
1. Set alarm limits
2. Set interrupt masks
3. Start the AMC80 monitoring process
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