Table 1. register functions (continued) – Rainbow Electronics MAX6641 User 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.