TPSM846C23_17 Datasheet, PDF (41/82 Pages) Texas Instruments – 4.5-V to 15-V Input, 0.35-V to 2.0-V Output, 35-A PMBus Power Module

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TPSM846C23
SLVSDF3C – MARCH 2017 – REVISED AUGUST 2017
Maximum: 000 0001 1111 (binary) 31 (decimal) (equivalent VIN_ON voltage = 7.75 V)
7.5.18 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, and trigger SMBALERT signal. The value of VIN_OFF remains unchanged during an out-of-range write
attempt. The contents of this register can be stored to nonvolatile memory using the STORE_DEFAULT_ALL
command.
The supported VIN_OFF values are shown in Table 9:
Table 9. Supported VIN_OFF Values
VIN_OFF Values (V)
4 (default)
4.25
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
6.75
7
7.25
7.5
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
4 most significant bits of the mantissa are fixed, while the lower 7 bits may be altered.
COMMAND
Format
Bit Position
Access
Function
Default Value
VIN_OFF
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
r
r/w^E r/w^E r/w^E r/w^E
Exponent
Mantissa
1
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
7.5.18.1 Exponent
default: 11110 (binary) –2 (decimal) (equivalent LSB = 0.25 V)
These default settings are not programmable.
7.5.18.2 Mantissa
default: 000 0001 0000 (binary) 16 (decimal) (equivalent VIN_OFF voltage = 4 V)
Minimum: 000 0001 0000 (binary) 16 (decimal) (equivalent VIN_OFF voltage = 4 V)
Maximum: 000 0001 1110 (binary) 30 (decimal) (equivalent VIN_OFF voltage = 7.5 V)
7.5.19 IOUT_CAL_OFFSET (39h)
The IOUT_CAL_OFFSET command is used to compensate for offset errors in the READ_IOUT results and the
IOUT_OC_FAULT_LIMIT and IOUT_OC_WARN_LIMIT thresholds. The units are amperes. The default setting is
0 A. The resolution of the argument for this command is 62.5 mA and the range is +3.9375 A to –4 A. Values
written outside of this range alias into the supported range. This occurs because the read-only bits are fixed. The
exponent is always –4 and the 5 MSB bits of the Mantissa are always equal to the sign bit. The contents of this
register can be stored to nonvolatile memory using the STORE_DEFAULT_ALL command.
COMMAND
Format
Bit Position
Access
Function
IOUT_CAL_OFFSET
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/w^E
r
r
r
r
r/w^E r/w^E r/w^E r/w^E r/w^E r/w^E
Exponent
Mantissa
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