Datasheet
TPS40400
SLUS930B –APRIL 2011– REVISED OCTOBER 2011
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•
2.7 ms (default value)
• 4.2 ms
• 6.0 ms
• 9.0 ms
A value of 0 ms instructs the unit to bring its output voltage to the programmed regulation value as quickly as
possible. The contents of this register can be stored to non-volatile memory using the STORE_DEFAULT_ALL or
STORE_DEFAULT_CODE commands.
The TON_RISE command is formatted as a linear mode two’s complement binary integer.
Command TON_RISE
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 1 1 0 0 0 0 0 0 0 1 0 1 0 1 1
Exponent
–4 (dec), fixed.
Mantissa
The upper two bits are fixed at 0.
The lower five bits are programmable with a default value of 43 (dec)
STATUS_BYTE (78h)
The STATUS_BYTE command returns one byte of information with a summary of the most critical device faults.
For TPS40400, 4 fault bits is flagged in this particular command: output over-voltage, output over-current,
over-temperature, and output under-voltage. The STATUS_BYTE reports communication faults in the CML bit.
Other communication faults set the NONE OF THE ABOVE bit.
Command STATUS_BYTE
Format Unsigned binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function X OFF VOUT_OV IOUT_OC VIN_UV TEMPERATURE CML NONE OF THE ABOVE
Default Value 0 0 0 0 0 0 0 0
A "1" in any of these bit positions indicates that:
OFF:
The device is not providing power to the output, regardless of the reason. In TPS40400, this flag
means that the converter is not enabled.
VOUT_OV:
An output overvoltage fault has occurred.
IOUT_OC:
An output over current fault has occurred.
VIN_UV:
An input undervoltage fault has occurred.
TEMPERATURE:
A temperature fault or warning has occurred.
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