F81866A Datasheet, PDF (71/210 Pages) Feature Integration Technology Inc. – 6 UARTs Super IO With 128 Bytes FIFO and Power

4 FREQ_SEL_ADD1 R/W 5VSB
3-2
Reserved
1-0
Reserved
R/W -
-
-
F81866A
This bit and FAN1_PWM_FREQ_SEL are used to select FAN1 PWM
frequency. NEW_FREQ_SEL1 = { FREQ_SEL_ADD1,
FAN1_PWM_FREQ_SEL}
0 00: 23.5 KHz
01: 11.75 KHz
10: 5.875 KHz
11: 220 Hz
0 Reserved (Keep the value of these two bits “0”)
- Reserved
Auto Fan Up Speed Update Rate Select Register ⎯ Index 9Bh (FAN_PROG_SEL = 0)
Bit
Name
R/W Reset Default
Description
7-6
Reserved
-
-
- Reserved.
Fan3 duty update rate:
00: 2Hz
5-4 FAN3_UP_RATE R/W 5VSB 01 01: 5Hz (default)
10: 10Hz
11: 20Hz
Fan2 duty update rate:
00: 2Hz
3-2 FAN2_UP_RATE R/W 5VSB 01 01: 5Hz (default)
10: 10Hz
11: 20Hz
Fan1 duty update rate:
00: 2Hz
1-0 FAN1_UP_RATE R/W 5VSB 01 01: 5Hz (default)
10: 10Hz
11: 20Hz
Auto Fan Down Speed update Rate Select Register ⎯ Index 9Bh (FAN_PROG_SEL = 1)
Bit
Name
R/W Reset Default
Description
0: Fan down rate disable
7 UP_DN_RATE_EN R/W 5VSB
1: Fan down rate enable
0
Set this bit 1 to use different fan up/down rate. If this bit is not set to 1, the
fan up/down rate will follow FAN_UP_RATE.
6 DIRECT_LOAD_EN R/W 5VSB
0: Direct load disable
0
1: Direct load enable for manual duty mode
71
Jan, 2012
V0. 12P