TPS40400 Datasheet, PDF (36/56 Pages) Texas Instruments – 3.0-V TO 20-V PMBus SYNCHRONOUS BUCK CONTROLLER

TPS40400
SLUS930A – APRIL 2011 – REVISED JULY 2011
www.ti.com
The contents of this register can be stored to non-volatile memory using the STORE_DEFAULT_ALL or
STORE_DEFAULT_CODE commands.
Command
IOUT_OC_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]
00: The device continues operation without interruption
01: This is unsupported and causes a data error.
10: 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].
11: The device shuts down and attempts to restart.
RS[2:0]
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.
IOUT_OC_WARN_LIMIT (4Ah)
The IOUT_OC_WARN_LIMIT command sets the value of the output current, in amperes, that causes the
over-current detector to indicate an over-current warning. When this current level is exceeded the device:
• Sets the OTHER bit in the STATUS_BYTE
• Sets the OCW bit in the STATUS_WORD
• Sets the IOUT overcurrent Warning (OCW) bit in the STATUS_IOUT register, and
• Notifies the host by asserting SMBALRT
The IOUT_OC_WARN_LIMIT threshold should always be set to less than or equal to the
IOUT_OC_FAULT_LIMIT. Writing a value to IOUT_OC_WARN_LIMIT greater than IOUT_OC_FAULT_LIMIT
causes the device to set the CML bit in the STATUS_BYTE and the invalid data (ivd) bit in the STATUS_CML
registers as well as assert the SMBALRT signal. The contents of this register can be stored to non-volatile
memory using the STORE_DEFAULT_ALL or STORE_DEFAULT_CODE commands.
The IOUT_OC_WARN_LIMIT takes a two byte data word formatted as follows:
Command
Format
Bit Position
Access
Function
Default Value
IOUT_OC_WARN_LIMIT
Linear, two's complement binary
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
r
r
r
r
r
r
r
r
r
r r/w r/w r/w r/w r/w r/w
Exponent
Mantissa
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
36
Submit Documentation Feedback
Product Folder Link(s) :TPS40400
Copyright © 2011, Texas Instruments Incorporated