Rainbow Electronics MAX16064 - Manual (Page 39)

MAX16064
±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
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VOUT_UV_FAULT_LIMIT (44h)
The VOUT_UV_FAULT_LIMIT command sets the value
of the output voltage measured across RS_+ and RS_-,
which causes an output undervoltage fault. This fault is
masked until the output voltage reaches the pro-
grammed voltage at startup, and also during turn-off
when the power supply is disabled.
The 2 data bytes are in DIRECT format. Valid values are
the same as VOUT_COMMAND.
The default VOUT_UV_FAULT_LIMIT value is 00h.
In response to violation of the VOUT_UV_FAULT_LIMIT,
the MAX16064:
1) Sets the OTHER bit in the STATUS_BYTE.
2) Sets the OTHER bit in the STATUS_WORD.
3) Sets the VOUT bit in the STATUS_WORD.
4) Sets the VOUT Undervoltage Fault bit in the
STATUS_VOUT register.
5) Sets the UV_FAULT bit in the STATUS_MFR_SPECIFIC
register.
6) Sets the UV_FAULT bit in the MFR_STATUS_WORD
register.
7) Sets the OTHER bit in the MFR_STATUS_WORD.
8) Responds as specified by VOUT_UV_FAULT_RESPONSE
bits in the MFR_FAULT_RESPONSE register.
9) Notifies the host using SMBALERT assertion.
OT_FAULT_LIMIT (4Fh)
The OT_FAULT_LIMIT command sets the temperature,
in degrees Celsius, of the on-chip temperature sensor
at which an overtemperature fault is detected.
The 2 data bytes are in DIRECT format. Valid values are
from -142.5°C to +395.4°C.
The default OT_FAULT_LIMIT value is 00h.
In response to the OT_FAULT_LIMIT being exceeded,
the MAX16064:
1) Sets the TEMPERATURE bit in the STATUS_BYTE.
2) Sets the TEMPERATURE bit in the STATUS_WORD.
3) Sets the TEMPERATURE bit in the
MFR_STATUS_WORD.
4) Sets the Overtemperature Fault bit in the
STATUS_TEMPERATURE.
5) Sets the OT_FAULT bit in the MFR_STATUS_WORD
register.
6) Responds as specified by OT_FAULT_RESPONSE
bits in the MFR_FAULT_RESPONSE register.
7) Notifies the host using SMBALERT assertion.
OT_WARN_LIMIT (51h)
The OT_WARN_LIMIT command sets the temperature,
in degrees Celsius, of the on-chip temperature sensor
at which an overtemperature warning is detected.
The 2 data bytes are in DIRECT format. Valid values are
the same as the OT_FAULT_LIMIT.
The default OT_WARN_LIMIT value is 00h.
In response to the OT_WARN_LIMIT being exceeded,
the MAX16064:
1) Sets the TEMPERATURE bit in the STATUS_BYTE.
2) Sets the TEMPERATURE bit in the STATUS_WORD.
3) Sets the TEMPERATURE bit in the
MFR_STATUS_WORD.
4) Sets the Overtemperature Warning bit in the
STATUS_TEMPERATURE.
5) Sets the OT_WARN bit in the MFR_STATUS_WORD
register.
6) Notifies the host through SMBALERT using asser-
tion.
TON_DELAY (60h)
TON_DELAY sets the time, in milliseconds, from when a
start condition is received (a valid OPERATION com-
mand or through A3/CONTROL when enabled) until the
power-supply output voltage starts to rise. During
TON_DELAY, the power supply is disabled (ENOUT_
deasserted) until TON_DELAY expires. Also, the under-
voltage fault and warning are masked off during
TON_DELAY.
The 2 data bytes are in DIRECT format. Valid values are
from 0 to 3276.7ms.
The default TON_DELAY value is 0.
TON_RISE (61h)
The TON_RISE sets the time, in milliseconds, from
when the power-supply output voltage starts to rise until
the voltage has entered the regulation band. During
TON_RISE, the voltage and temperature-related faults
and warnings are masked off. Meanwhile, the
MAX16064 still responds to the PMBus command. If a
TON_RISE parameter results in the DAC outputting an
out-of-range value (valid range 0 to 4090) immediately
during TON_RISE, the CML flag is set and SMBALERT
asserts to issue a warning.