Datasheet

TPS40400
www.ti.com SLUS930B –APRIL 2011– REVISED OCTOBER 2011
VIN_OFF (36h)
The VIN_OFF command sets the value of the input voltage at which the unit should stop operation. Values are
mapped to the nearest supported increment. Values outside the supported range is treated as invalid data and
causes the device to 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 during 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_OFF VALUES
2.50
(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
(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 resultx 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
4 most significant bits of the mantissa are fixed, while the lower 7 bits may be altered.
Command VIN_OFF
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 0
Exponent
–2 (dec), fixed.
Mantissa
The upper four bits are fixed at 0.
The lower seven bits are programmable with a default value of 10 (dec)
IOUT_CAL_GAIN (38h)
The IOUT_CAL_GAIN is the ratio of the voltage at the current sense element to the sensed current. The units
are Ohms (Ω). The effective current sense element can be the DC resistance of the inductor or a separate
current sense resistor. The default setting is 3 mΩ, and the resolution is 30.5 µΩ. The range is 0 to 15.6 mΩ. The
contents of this register can be stored to non-volatile memory using the STORE_DEFAULT_ALL or
STORE_DEFAULT_CODE commands.
Command IOUT_CAL_GAIN
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/w r/w r/w r/w r/w r/w r/w r/w r/w
Function Exponent Mantissa
Default Value 1 0 0 0 1 0 0 0 0 1 1 0 0 0 1 0
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