Rainbow Electronics MAX6641 - Manual (Page 7)

MAX6641
SMBus-Compatible Temperature Monitor with
Automatic PWM Fan-Speed Controller
_______________________________________________________________________________________ 7
READ/
WRITE
REGISTER
ADDRESS
POR
STATE
FUNCTION/
NAME
D7 D6 D5 D4 D3 D2 D1 D0
R/W 0Ch 0000 0000
Local-diode
fan-start
temperature
MSB
(+128 °C)
(+64 °C) (+32 °C) (+16 °C) (+8°C) (+4 °C) (+2 °C)
LSB
(+1 °C)
R/W 0Dh 0000 xxxx
Fan
configuration
H yster esi s:
0 = 5 °C ,
1 = 10 °C
Temp
step: 0 =
1 °C, 1 =
2 °C
Fan control:
1 = remote
Fan
control:
1 = local
X X X X
R/W 0Eh 101x xxxx
Duty-cycle
rate of change
MSB — LSB X X X X X
R/W 0Fh 0101 xxxx
Duty-cycle
step size
MSB — — LSB X X X X
R/W 10h 010x xxxx
PWM
frequency
select
Select A Select B Select C X X X X X
R FDh 0000 0001
Read device
revision
0 0 0 0 0 0 0 1
R FEh 1000 0111
Read
device ID
1 0 0 0 0 1 1 1
R FFh 0100 1101
Read
manufacturer
ID
0 1 0 0 1 1 0 1
Table 1. Register Functions (continued)
X = Don’t care. See register descriptions for further details.