MAX31785 MAXIM [Maxim Integrated Products], MAX31785 Datasheet - Page 40

• Manufacturer Part Number: MAX31785
• Description: 6-Channel Intelligent Fan Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

6-Channel Intelligent Fan Controller
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.
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
40
14:10
BIT
9:6
15
5
4
3
2
1
0
BIT NAME
ENABLE
OFFSET
FAN5
FAN4
FAN3
FAN2
FAN1
FAN0
0
0 = Temperature sensor disabled.
1 = Temperature sensor enabled.
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.
These bits always return a 0.
0 = Temperature sensor is not used to control fan 5 speed.
1 = Temperature sensor is used to control fan 5 speed.
0 = Temperature sensor is not used to control fan 4 speed.
1 = Temperature sensor is used to control fan 4 speed.
0 = Temperature sensor is not used to control fan 3 speed.
1 = Temperature sensor is used to control fan 3 speed.
0 = Temperature sensor is not used to control fan 2 speed.
1 = Temperature sensor is used to control fan 2 speed.
0 = Temperature sensor is not used to control fan 1 speed.
1 = Temperature sensor is used to control fan 1 speed.
0 = Temperature sensor is not used to control fan 0 speed.
1 = Temperature sensor is used to control fan 0 speed.
OFFSET VALUE
1Dh
1Eh
00h
01h
02h
1Fh
MEANING
MFR_TEMP_SENSOR_CONFIG (F0h)
MFR_TIME_COUNT (DDh)
CONFIGURATION
Offset = +29NC
Offset = +30NC
Offset = +1NC
Offset = +2NC
Offset = 0NC
Test Mode