Datasheet

TPS40400

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SLUS930B –APRIL 2011– REVISED OCTOBER 2011

Command VOUT_OV_FAULT_LIMIT

Format Linear, two's complement binary

Bit Position 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

Access r r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w

Function High Byte Low Byte

Default Value 0 0 0 0 0 1 0 1 0 0 0 0 1 0 0 0

VOUT_OV_FAULT_RESPONSE (41h)

Description: The VOUT_OV_FAULT_RESPONSE command instructs the device on what action to take in

response to a VOUT_OV_FAULT_LIMIT fault. The device also:

• Sets the VOUT_OV bit in the STATUS_BYTE

• Sets the VOUT bit in the STATUS_WORD

• Sets the VOUT OV fault bit in the STATUS_VOUT register, and

• Notifies the host via SMBALRT pin

The contents of this register can be stored to non-volatile memory using the STORE_DEFAULT_ALL or

STORE_DEFAULT_CODE commands.

A one-byte unsigned binary data argument is used with this command:

Command VOUT_OV_FAULT_RESPONSE

Format Unsigned binary

Bit Position 7 6 5 4 3 2 1 0

Access r/W r/w r/w r/w r/w r r r

Function RSP[1] RSP[0] RS[2] RS[1] RS[0] X X X

Default Value 0 0 0 0 0 1 0 0

RSP[1:0]

Output voltage overvoltage response

00: The device continues operation without interruption.

01: The device continues operation for four switching cycles. If the fault is still present, the device shuts

down and responds according to RS[2:0].

10: The device shuts down and responds according to RS[2:0].

11: The device shuts down and attempts to restart.

RS[2:0]

Output voltage overvoltage retry setting

000: A zero value for the Retry Setting means that the unit does not attempt to restart. The output

remains disabled until the fault is cleared (See section 10.7 of the PMBus spec.)

111: A one value for the Retry Setting means that the unit goes through a normal startup (Soft start)

continuously, without limitation, until it is commanded off or bias power is removed or another fault

condition causes the unit to shutdown.

Any value other than 000 or 111 is not accepted.

Product Folder Link(s) :TPS40400