Datasheet

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6-Channel Intelligent Fan Controller

MAX31785

MFR_MODE (D1h)

The MFR_MODE command is used to configure the device to support manufacturer specific commands. The MFR_

MODE command is described in Table 22. After this command is sent, another command should not be sent for at

least 250ms.

Table 22. MFR_MODE

BIT BIT NAME MEANING

15 FORCE_NV_FAULT_LOG

Setting this bit to 1 forces the device to log data into the nonvolatile fault log. Once set, the

device clears this bit when the action is completed. The host must set again for subsequent

action. If an error occurs during this action, the device sets the CML bit in STATUS_BYTE

and STATUS_WORD; no bits are set in STATUS_CML.

14 CLEAR_NV_FAULT_LOG

Setting this bit to 1 forces the device to clear the nonvolatile fault log by writing FFh to all

byte locations. Once set, the device clears this bit when the action is completed. The host

must set again for subsequent action. If an error occurs during this action, the device sets

the CML bit in STATUS_BYTE and STATUS_WORD; no bits are set in STATUS_CML.

13 ALERT

0 = ALERT disabled (device does not respond to ARA).

1 = ALERT enabled (device responds to ARA and ARA must be used).

12 0 This bit always returns a 0.

11 SOFT_RESET This bit must be set, then cleared and set again within 8ms for a soft reset to occur.

10:8 0 These bits always return a 0.

7:6 FAN_HEALTH_CRITERIA

These bits select the threshold for the expected RPM in the fan health monitor.

BIT GREEN ORANGE RED

0 0 < 10% < 15% > 15%

0 1 < 10% < 20% > 20%

1 0 < 15% < 20% > 20%

1 1 < 15% < 25% > 25%

5 ADC5_ENABLE

0 = ADC5 voltage sense disabled.

1 = ADC5 voltage sense enabled (overridden if temp sense enabled)

4 ADC4_ENABLE

0 = ADC4 voltage sense disabled.

1 = ADC4 voltage sense enabled (overridden if temp sense enabled)

3 ADC3_ENABLE

0 = ADC3 voltage sense disabled.

1 = ADC3 voltage sense enabled (overridden if temp sense enabled)

2 ADC2_ENABLE

0 = ADC2 voltage sense disabled.

1 = ADC2 voltage sense enabled (overridden if temp sense enabled)

1 ADC1_ENABLE

0 = ADC1 voltage sense disabled.

1 = ADC1 voltage sense enabled (overridden if temp sense enabled)

0 ADC0_ENABLE

0 = ADC0 voltage sense disabled.

1 = ADC0 voltage sense enabled (overridden if temp sense enabled)