Rainbow Electronics MAX16064 - Manual (Page 38)

ing the VOUT_TRANSITION_RATE slew rate. Final
accuracy of V
OUT is assured by the closed-loop volt-
age control.
This value is dimensionless.
The default VOUT_SCALE_LOOP value is 00h.
The VOUT_SCALE_LOOP command is ignored in feed-
back mode.
VOUT_OV_FAULT_LIMIT (40h)
The VOUT_OV_FAULT_LIMIT command sets the value
of the output voltage measured across RS_+ and RS_-,
which causes an output overvoltage fault.
The two data bytes are in DIRECT format. Valid values
are the same as VOUT_COMMAND.
The default VOUT_OV_FAULT_LIMIT value is 00h.
In response to the VOUT_OV_FAULT_LIMIT being
exceeded, the MAX16064:
1) Sets the VOUT_OV bit in the STATUS_BYTE.
2) Sets the VOUT_OV bit in the STATUS_WORD.
3) Sets bit 5 (low byte) and bit 7 (high byte) of the
STATUS_WORD.
4) Sets the VOUT Overvoltage Fault bit in the STA-
TUS_VOUT.
5) Sets the VOUT_OV bit in the MFR_STATUS_WORD
register.
6) Responds as specified by VOUT_OV_FAULT_
RESPONSE bits in the MFR_FAULT_RESPONSE
register.
7) Notifies the host through SMBALERT assertion.
VOUT_OV_WARN_LIMIT (42h)
The VOUT_OV_WARN_LIMIT command sets the value
of the output voltage measured across RS_+ and RS_-,
which causes an output voltage high warning. This
value is typically less than the output overvoltage
threshold in VOUT_OV_FAULT_LIMIT.
The two data bytes are in DIRECT format. Valid values
are the same as the VOUT_COMMAND.
The default VOUT_OV_WARN_LIMIT value is 00h.
In response to the VOUT_OV_WARN_LIMIT being
exceeded, 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 Overvoltage Warning bit in the
STATUS_VOUT.
5) Sets the OV_WARN bit in the STATUS_MFR_SPECIFIC
register.
6) Sets the OV_WARN bit in the MFR_STATUS_WORD
register.
7) Sets the OTHER bit in the MFR_STATUS_WORD.
8) Notifies the host using SMBALERT assertion.
VOUT_UV_WARN_LIMIT (43h)
The VOUT_UV_WARN_LIMIT command sets the value
of the output voltage measured across RS_+ and RS_-,
which causes an output-voltage low warning. This value
is typically greater than the output undervoltage fault
threshold in VOUT_UV_FAULT_LIMIT.
This warning is masked until the output voltage reaches
the programmed voltage at startup, and also during
turn-off when the power supply is disabled.
The two data bytes are in DIRECT format. Valid values
are the same as VOUT_COMMAND.
The default VOUT_UV_WARN_LIMIT value is 00h.
In response to violation of the VOUT_UV_WARN_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 Warning bit in the
STATUS_VOUT register.
5) Sets the UV_WARN bit in the STATUS_MFR_SPE-
CIFIC register.
6) Sets the UV_WARN bit in the MFR_STATUS_WORD
register.
7) Sets the OTHER bit in the MFR_STATUS_WORD.
8) Notifies the host using SMBALERT assertion.
MAX16064
±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
38 ______________________________________________________________________________________
R 2
R 1
VO+ VO-
RS_-
RS_+
POWER
SUPPLY
MAX16064
LOAD
Figure 18. VOUT_SCALE_LOOP