LTC3882_15 Datasheet, PDF (97/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (Fault Response and Communication)
MFR_GPIO_PROPAGATE_LTC3882
The MFR_GPIO_PROPAGATE_LTC3882 command determines events that cause GPIO to be asserted. Setting a bit in
this register to a one allows the specified condition to assert the GPIO output for that channel. GPIO is not asserted
by a fault, even if set to propagate, if that FAULT_RESPONSE is set to Ignore. The state of SMBLALERT_MASK does
not affect GPIO propagation.
Supported Values:
BIT PROPAGATED CONDITION
15
Waiting for V_OUT decay before restart.
14
V_OUT short cycled (automatically deasserted 120ms after V_OUT is fully OFF).
13
TON_MAX_FAULT_LIMIT exceeded.
12
V_OUT below UV (unfiltered).
11
MFR_OT_FAULT_LIMIT exceeded.
10* Channel 1 POWER_GOOD false.
9*
Channel 0 POWER_GOOD false.
8
UT_FAULT_LIMIT exceeded.
7
OT_FAULT_LIMIT exceeded.
6
(Reserved).
5
(Reserved).
4
VIN_OV_FAULT_LIMIT exceeded.
3
(Reserved).
2
IOUT_OC_FAULT_LIMIT exceeded.
1
VOUT_UV_FAULT_LIMIT exceeded.
0
VOUT_OV_FAULT_LIMIT exceeded.
*If this bit is set, MFR_GPIO_RESPONSE must be set to ignore (0x00), otherwise the channel will not start.
This command has two data bytes.
MFR_GPIO_RESPONSE
The MFR_GPIO_RESPONSE command instructs the device on what action to take in response to a GPIO pin being
pulled low by anything other than an internal fault.
Supported Values:
VALUE MEANING
0xC0 Related PWM output is immediately disabled.
0x00 Input ignored, PWM operation continues without interruption.
When a GPIO pin is low, the device also:
• Sets the MFR_SPECIFIC Bit in the STATUS_WORD
• Sets Bit 0 in the STATUS_MFR_SPECIFIC Command to Indicate GPIO Is or Has Been Low
• Notifies the Host by Asserting ALERT, Unless Masked
This command has one data byte.
For more information www.linear.com/LTC3882
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