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| MEC1322 Datasheet, PDF (412/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC | |||
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MEC1322
38.12 Fan Tachometer Timing
FIGURE 38-18: FAN TACHOMETER INPUT TIMING
FAN_TACHx
t1
t2
t3
TABLE 38-17: FAN TACHOMETER INPUT TIMING PARAMETERS
Name
Description
MIN
TYP
MAX
Units
t1
t2
t3
Note:
Pulse Time
100
µsec
Pulse High Time
20
Pulse Low Time
20
tTACH is the clock used for the tachometer counter. It is 30.52 * prescaler, where the prescaler is pro-
grammed in the Fan Tachometer Timebase Prescaler register.
DS00001719D-page 412
ï£ 2014 - 2015 Microchip Technology Inc.
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