OOTT Status (05h)
Read the OT status register to determine which channel
recorded an overtemperature condition. Bit D7 is high if
the fault reading occurred from channel 1. Bit D6 is
high if the fault reading occurred in channel 2. The OT
status register is cleared only by reading its contents.
After reading the OT status register, a temperature reg-
ister read must be done. Reading the contents of the
register also makes the OT output high impedance. If
the fault is still present on the next temperature mea-
surement cycle, the corresponding bits and the OT out-
put are set again. The POR state of the OT status regis-
ter is 00h.
OOTT Mask (06h)
Set bit D7 to 1 in the OT mask register to prevent the
OT output from asserting on faults in channel 1. Set bit
D6 to 1 to prevent the OT output from asserting on
faults in channel 2. The POR state of the OT mask reg-
ister is 00h.
2-Channel Temperature Monitor with Dual Automatic
PWM Fan-Speed Controller and Five GPIOs
12 ______________________________________________________________________________________
Table 2. Register Map (continued)
READ/
WRITE
REGISTER
NO.
/ADDRESS
POR
STATE
FUNCTION
D7
D6
D5
D4
D3
D2
D1
D0
R
0Eh
0000 000x
PWMOUT2
instantaneous
duty cycle
MSB
(128/240)
LSB
(2/240)
R/W
0Fh
0000 0000
Temperature
channel 1 fan-
start temperature
MSB
LSB
R/W
10h
0000 0000
Temperature
channel 2 fan-
start temperature
MSB
LSB
R/W
11h
0000 000x
Fan
configuration
Hys ter
esi s:
0 = 5癈,
1 = 10癈
Temp
step: 0 =
1癈,
1 = 2癈
PWMOUT
1 control:
1 =
channel1
PWMOUT
1 control:
1 =
channel 2
PWMOUT
2 control:
1 =
channel 1
PWMOUT
2 control:
1 =
channel 2
R/W
12h
1011 01xx
Duty-cycle rate
of change
PWMOUT
1 MSB
PWMOUT
1 LSB
PWMOUT
2 MSB
PWMOUT
2 LSB
R/W
13h
0101 0101
Duty-cycle step
size
PWMOUT
1 MSB
PWMOUT
1 LSB
PWMOUT
2 MSB
PWMOUT
2 LSB
R/W
14h
010x xxxx
PWM frequency
select
Select A Select B Select C
R/W
15h
xxx0 0000
GPIO function
GPIO4: 0
= output,
1 = input
GPIO3: 0
= output,
1 = input
GPIO2: 0
= output,
1 = input
GPIO1: 0
= output,
1 = input
GPIO0: 0
= output,
1 = input
R/W
16h
xxx***
GPIO value
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
R
FDh
0000 0001
Read device
revision
0
0
0
0
0
0
0
1
R
FEh
1000 0110 Read device ID
1
0
0
0
0
1
1
0
R
FFh
0100 1101
Read
manufacturer ID
0
1
0
0
1
1
0
1
***GPIO0 through GPIO4 POR values set by Preset0 through Preset4.
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