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LM89
SNIS128C – AUGUST 2002 – REVISED MARCH 2013
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LM89
with
Filter Off
LM89
with
Filter On
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0
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200
SAMPLE NUMBER
A.
The filter on and off curves were purposely offset to better show noise performance.
Figure 13. Digital Filter Response in a Pentium 4 processor System
FAULT QUEUE
In order to suppress erroneous ALERT or T_CRIT triggering the LM89 incorporates a Fault Queue. The Fault
Queue acts to insure a remote temperature measurement is genuinely beyond a HIGH, LOW or T_CRIT setpoint
by not triggering until three consecutive out of limit measurements have been made, see Figure 14 . The fault
queue defaults off upon power-up and may be activated by setting bit D0 in the Configuration register (09h) to
“1”.
RDTS Measurement
Status Register: RTDS High
n
n+1
n+2
n+3
n+4
n+5
SAMPLE NUMBER
Figure 14. Fault Queue Temperature Response Diagram
ONE-SHOT REGISTER
The One-Shot register is used to initiate a single conversion and comparison cycle when the device is in standby
mode, after which the device returns to standby. This is not a data register and it is the write operation that
causes the one-shot conversion. The data written to this address is irrelevant and is not stored. A zero will
always be read from this register.
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