ina219 datasheet

INA219
SBOS448G –AUGUST 2008–REVISED DECEMBER 2015 www.ti.com
8.6 Register Maps
8.6.1 Register Information
The INA219 uses a bank of registers for holding configuration settings, measurement results, maximum/minimum
limits, and status information. Table 2 summarizes the INA219 registers; Functional Block Diagram shows
registers.
Register contents are updated 4 μs after completion of the write command. Therefore, a 4-μs delay is required
between completion of a write to a given register and a subsequent read of that register (without changing the
pointer) when using SCL frequencies in excess of 1 MHz.
Table 2. Summary of Register Set
POINTER
POWER-ON RESET
ADDRESS
REGISTER NAME FUNCTION TYPE
(1)
HEX BINARY HEX
All-register reset, settings for bus
00 Configuration voltage range, PGA Gain, ADC 00111001 10011111 399F R/W
resolution/averaging.
01 Shunt voltage Shunt voltage measurement data. Shunt voltage — R
02 Bus voltage Bus voltage measurement data. Bus voltage — R
03 Power
(2)
Power measurement data. 00000000 00000000 0000 R
Contains the value of the current flowing
04 Current
(2)
00000000 00000000 0000 R
through the shunt resistor.
Sets full-scale range and LSB of current
05 Calibration and power measurements. Overall 00000000 00000000 0000 R/W
system calibration.
(1) Type: R = Read only, R/W = Read/Write.
(2) The Power register and Current register default to 0 because the Calibration register defaults to 0, yielding a zero current value until the
Calibration register is programmed.
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