Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
t1
t2
t3
FAN_TACHx
Figure 13.23 – Fan Tachometer Input Timing
NAME
DESCRIPTION
Pulse Time (1/2 Revolution Time=30/RPM)
Pulse High Time
MIN
TYP
11.11
5.55
MAX
UNITS
µsec
µsec
t1
t2
t3
Pulse Low Time
5.55
µsec
t1
t2
LED
Figure 13.24 – Power LED Output Timing
DESCRIPTION MIN
NAME
t1
t2
TYP
1.49
0.59
MAX
UNITS
sec
sec
Period
Blink ON Time
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
214
SMSC LPC47M182
DATASHEET