Datasheet

Current=
ShuntVoltage CalibrationRegister´
4096
TPS2480
TPS2481
SLUS939B –APRIL 2010–REVISED DECEMBER 2010 www.ti.com
Current Register 04h (Read-Only)
Full-scale range and LSB depend on the value entered in the Calibration Register. See the TPS2480/81 Power
Measurement Engine section. Negative values are stored in two's complement format.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
CSIGN CD14 CD13 CD12 CD11 CD10 CD9 CD8 CD7 CD6 CD5 CD4 CD3 CD2 CD1 CD0
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
The value of the Current Register is calculated by multiplying the value in the Shunt Voltage Register with the
value in the Calibration Register according to the equation:
Calibration Register
Calibration Register 05h (Read/Write)
Current and power calibration are set by bits D15 to D1 of the Calibration Register. Note that bit D0 is not used in
the calculation. This register sets the current that corresponds to a full-scale drop across the shunt. Full-scale
range and the LSB of the current and power measurement depend on the value entered in this register. See the
TPS2480/81 Power Measurement Engine section. This register is suitable for use in overall system calibration.
Note that the '0' POR values are all default.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
(1)
BIT
FS15 FS14 FS13 FS12 FS11 FS10 FS9 FS8 FS7 FS6 FS5 FS4 FS3 FS2 FS1 FS0
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
(1) D0 is a void bit and will always be '0'. It is not possible to write a '1' to D0. CALIBRATION is the value stored in D15:D1.
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