Datasheet

6-Channel Intelligent Fan Controller
MAX31785
40
MFR_TIME_COUNT (DDh)
The MFR_TIME_COUNT command returns the number of seconds of device lifetime operation. Once every hour, the
device automatically stores this counter in flash memory. The counter is a 32-bit value that rolls over. The latest stored
value is automatically recalled from flash memory upon device power cycle, RST action, or a soft reset. This count
can be reset to zero by writing a sequence of all zeros (00000000h), followed by all ones (FFFFFFFFh), followed by all
zeros (00000000h) within 8ms.
MFR_TEMP_SENSOR_CONFIG (F0h)
The MFR_TEMP_SENSOR_CONFIG command is used to configure the temperature sensors. Table 25 describes the
MFR_TEMP_SENSOR_CONFIG command.
Table 25. MFR_TEMP_SENSOR_CONFIG
BIT BIT NAME MEANING
15 ENABLE
0 = Temperature sensor disabled.
1 = Temperature sensor enabled.
14:10 OFFSET
The OFFSET setting is used to allow the temperature reading to be normalized among multiple
temperature sensors. Values from 00h to 1Eh select the offset value. The valid range is 0NC to
+30NC in 1NC steps. If OFFSET is 1Fh, the device automatically uses the value written to the
OT_WARN_LIMIT command code for the LUT instead of the digitized measured temperature.
OFFSET VALUE CONFIGURATION
00h
Offset = 0NC
01h
Offset = +1NC
02h
Offset = +2NC
1Dh
Offset = +29NC
1Eh
Offset = +30NC
1Fh Test Mode
9:6 0 These bits always return a 0.
5 FAN5
0 = Temperature sensor is not used to control fan 5 speed.
1 = Temperature sensor is used to control fan 5 speed.
4 FAN4
0 = Temperature sensor is not used to control fan 4 speed.
1 = Temperature sensor is used to control fan 4 speed.
3 FAN3
0 = Temperature sensor is not used to control fan 3 speed.
1 = Temperature sensor is used to control fan 3 speed.
2 FAN2
0 = Temperature sensor is not used to control fan 2 speed.
1 = Temperature sensor is used to control fan 2 speed.
1 FAN1
0 = Temperature sensor is not used to control fan 1 speed.
1 = Temperature sensor is used to control fan 1 speed.
0 FAN0
0 = Temperature sensor is not used to control fan 0 speed.
1 = Temperature sensor is used to control fan 0 speed.