Datasheet

TPS40400
SLUS930B APRIL 2011 REVISED OCTOBER 2011
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VIN_ON (35h)
The VIN_ON command sets the value of the input voltage at which the unit should start operation assuming all
other required startup conditions are met. Values are mapped to the nearest supported increment. Values
outside the supported range are treated as invalid data and cause the device set the CML bit in the
STATUS_BYTE and the invalid data (ivd) bit in the STATUS_CML registers. The value of VIN_ON remains
unchanged on an out-of-range write attempt. The contents of this register can be stored to non-volatile memory
using the STORE_DEFAULT_ALL or STORE_DEFAULT_CODE commands.
SUPPORTED VIN_ON VALUES
2.75
(1)
6.50 10.50 14.50
3.00 7.00 11.00 15.00
3.50 7.50 11.50 15.50
4.00 8.00 12.00 16.00
4.50 8.50 12.50 16.50
5.00 9.00 13.00 17.00
5.50 9.50 13.50 17.50
6.00 10.00 14.00 18.00
(1) Default setting
VIN_ON must be set higher than VIN_OFF. Attempting to write either VIN_ON lower than VIN_OFF or VIN_OFF
higher than VIN_ON results in the new value being rejected, SMBALERT being asserted along with the CML bit
in STATUS_BYTE and the invalid data bit in STATUS_CML.
The data word that accompanies this command is divided into a fixed 5-bit exponent and an 11-bit mantissa. The
four most significant bits of the mantissa are fixed, while the lower 7 bits may be altered.
Command VIN_ON
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 r r r r r r r r/w r/w r/w r/w r/w r/w r/w
Function Exponent Mantissa
Default Value 1 1 1 1 0 0 0 0 0 0 0 0 1 0 1 1
Exponent
2 (dec), fixed.
Mantissa
The upper four bits are fixed at 0.
The lower seven bits are programmable with a default value of 11 (dec).
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