Datasheet

PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
MAX34441
37
STATUS_MFR_SPECIFIC (80h)
The STATUS_MFR_SPECIFIC command returns 1 byte of information with a summary of the reason for a fault. The
STATUS_MFR_SPECIFIC message content is described in Table 24.
STATUS_FANS_1_2 (81h)
The STATUS_FANS_1_2 command returns 1 byte of information with the status of the fan. The STATUS_FANS_1_2
command is described in Table 25.
READ_VOUT (8Bh)
The READ_VOUT command returns the actual measured (not commanded) output voltage. READ_VOUT is measured
and updated every 5ms. The 2 data bytes are in DIRECT format.
READ_IOUT (8Ch)
The READ_IOUT command returns the latest measured current value. READ_IOUT is measured and updated every
200ms. The 2 data bytes are in DIRECT format.
READ_TEMPERATURE_1 (8Dh)
The READ_TEMPERATURE_1 command returns the temperature returned from the temperature sensor. The value of
READ_TEMPERATURE_1 does not have offset from MFR_TEMP_SENSOR_CONFIG added. READ_TEMPERATURE_1
returns 7FFFh if the sensor is faulty and 0000h if the sensor is disabled. READ_TEMPERATURE_1 is measured and
updated once a second. The 2 data bytes are in DIRECT format.
Table 24. STATUS_MFR_SPECIFIC
Note: The settings of the OFF and POWER_GOOD# bits do not assert the ALERT signal.
Table 25. STATUS_FANS_1_2
BIT BIT NAME MEANING
7 OFF
This bit is set if the power supply is off (due to either a fault or sequencing delay; this bit is
not set if the power supply is disabled).
6 OT_WARN Overtemperature warning.
5 OT_FAULT Overtemperature fault.
4 WATCHDOG A watchdog reset has occurred.
3 MARGIN_FAULT This bit is set if the device cannot properly close-loop margin the power supply.
2 POWER_GOOD# Power-supply voltage has fallen from POWER_GOOD_ON to less than POWER_GOOD_OFF.
1 OC_FAULT IOUT overcurrent fault.
0 OC_WARN IOUT overcurrent warning.
BIT BIT NAME MEANING
7 FAN_1_FAULT Fan 1 fault.
6 0 This bit always returns a 0.
5 FAN_1_WARN Fan 1 warning.
4:0 0 These bits always return a 0.