Datasheet

Bus Voltage Register 04h (Read-Only)
Power Register 05h (Read-Only)
Power=
Current BusVoltage´
5000
Current Register 06h (Read-Only)
Current=
ShuntVoltage CalibrationRegister´
4096
INA209
SBOS403B – JUNE 2007 – REVISED MARCH 2009 ......................................................................................................................................................... www.ti.com
The Bus Voltage Register stores the most recent bus voltage reading, V
BUS
.
At full-scale range = 32V (decimal = 8000, hex = 1F40), and LSB = 4mV.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
BD12 BD11 BD10 BD9 BD8 BD7 BD6 BD5 BD4 BD3 BD2 BD1 BD0 — — —
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
At full-scale range = 16V (decimal = 4000, hex = 0FA0), and LSB = 4mV.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
0 BD11 BD10 BD9 BD8 BD7 BD6 BD5 BD4 BD3 BD2 BD1 BD0 — — —
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
Full-scale range and LSB are set by the Calibration Register. See the Programming the INA209 Power
Measurement Engine section.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
PD15 PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
The Power Register records power in watts by multiplying the values of the current with the value of the bus
voltage according to the equation:
Full-scale range and LSB depend on the value entered in the Calibration Register. See the Programming the
INA209 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:
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