Elapsed Time Indicator; Temperature Sensing - GE IMP2B Hardware Reference Manual

3.14.3 Elapsed Time Indicator

The DS1682 ETI logs the total amount of time for which the board has been powered.
Time is measured with a resolution of a quarter of a second and provides 34 years of
total time accumulation. The ETI also logs the number of times power to the board
has been cycled. The stored values are zeroed before shipping and the device set to
'read only'.
For more details see the device data sheet.

3.14.4 Temperature Sensing

The IMP2B has two temperature sensors. An LM92 is used to measure the ambient
board temperature and an ADT7461 is used to measure the CPU junction
temperature. Both are capable of generating interrupts on either high or low ranges.
Publication No. IMP2B-0HH/5
LINK
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2756
LINK
For more details on the ADT7461, see
http://www.analog.com/UploadedFiles/Data_Sheets/361452644ADT7461_b.pdf
LINK
For more details on the LM92, see http://www.national.com/pf/LM/LM92.html
Functional Description 27