Rainbow Electronics MAX16064 - Manual (Page 45)

MAX16064
±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
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Table 17. MFR_STATUS_WORD Bit Definition
BIT NUMBER STATUS BIT NAME MEANING
15 EN_FAULT EN input is below its threshold when OPERATION is on.
14 OT_WARN Overtemperature warning (Same as STATUS_TEMPERATURE bit 6).
13 OT_FAULT Overtemperature fault (Same as STATUS_TEMPERATURE bit 7).
12 ADCERR_FAULT An ADC conversion fault has occurred.
11 N/A This bit is reserved and always returns 0.
10 UV_WARN A VOUT undervoltage warning has occurred (same as STATUS_VOUT bit 4).
9 UV_FAULT A VOUT undervoltage fault has occurred (same as STATUS_VOUT bit 5).
8 OV_WARN A VOUT overvoltage warning has occurred (same as STATUS_VOUT bit 6).
7 BUSY
A fault was declared because the device was busy and unable to respond.
The BUSY bit is not supported. This bit always returns 0.
6 OFF
This bit is asserted if ENOUT is presently disabling the power supply, regardless of the
reason, including simply not being enabled.
5 VOUT_OV An output overvoltage fault has occurred.
4 IOUT_OC
An output overcurrent fault has occurred.
The IOUT_OC bit is not supported. This bit always returns 0.
3 VIN_UV
An input undervoltage fault has occurred.
The VIN_UV bit is not supported. This bit always returns 0.
2 TEMPERATURE A temperature fault or warning has occurred.
1 CML A communication, memory, or logic fault has occurred.
0 OTHER A fault or warning not listed in bits [7:1] has occurred.
MFR_SAMPLE_RATE (D3h)
The MFR_SAMPLE_RATE command sets the frequency
(Hz) at which the ADC conversion result registers (rep-
resenting four voltages and one temperature) are com-
pared with their threshold limits. This parameter does
not control the total ADC sampling rate, which is con-
trolled by MFR_VLTO. Also, the output-voltage adjust-
ment rate is not affected by this parameter.
Monitor Sample Frequency =
10kHz/MFR_SAMPLE_RATE
The 2 data bytes are formatted as positive integers. Valid
values are from 1 to 65535. Do not set this value to 0.
The default MFR_SAMPLE_RATE value is 50 which is
equivalent to a sample frequency of 200Hz.
MFR_VOUT_PEAK (D4h)
The MFR_VOUT_PEAK command returns the maximum
actual measured (not commanded) output voltage in
volts across RS_+ and RS_-. If the filter mode is
enabled, instead of returning the instantaneous value,
the filtered output voltage is returned. To reset this
value to 0, write to this command with a data value of 0.
Any other values written by this command are used as
a comparison for future peak updates.
The 2 data bytes are in DIRECT format. Valid values are
the same as VOUT_COMMAND.
The default MFR_VOUT_PEAK value is 0.
MFR_TEMPERATURE_PEAK (D6h)
The MFR_TEMPERATURE_PEAK command returns the
maximum actual on-chip measured temperature in
degrees Celsius. To reset this value to its lowest value,
write to this command with a data value of 0FFFFh. Any
other values written by this command are used as a
comparison for future peak updates.
The 2 data bytes are in DIRECT format. Valid values are
the same as OT_FAULT_LIMIT.
The default MFR_TEMPERATURE_PEAK value is 00h.
MFR_STATUS_WORD (D8h)
When a warning or fault condition is detected, the
MAX16064 sets the corresponding bit in the
MFR_STATUS_WORD register to 1 and notifies the host
using SMBALERT assertion. The MFR_STATUS_WORD
[7:0] (low byte) bits are the same definition and state as
the STATUS_BYTE command.
This register is cleared to 0 together with the STATUS_BYTE
register by any of the fault/warning clearing methods men-
tioned earlier in the CLEAR_FAULTS command.
The MFR_STATUS_WORD command value cannot be
restored by the RESTORE_DEFAULT_ALL command.
This command is read only.