REGISTER INFORMATION

INA220

The INA220 uses a bank of registers for holding

Register contents are updated 4

µs after completion of

configuration

settings,

measurement

results,

the write command. Therefore, a 4

µs delay is

maximum/minimum limits, and status information.

required between completion of a write to a given

Table 2 summarizes the INA220 registers; Figure 13

register and a subsequent read of that register

illustrates registers.

(without changing the pointer) when using SCL

frequencies in excess of 1MHz.

Table 2. Summary of Register Set

POINTER

ADDRESS

POWER-ON RESET

HEX

REGISTER NAME

FUNCTION

BINARY

HEX

All-register reset, settings for bus

00

Configuration Register

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 measurement data.

00000000 00000000

0000

R

Contains the value of the current flowing

04

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.

22

Submit Documentation Feedback

Copyright © 2009, Texas Instruments Incorporated

Product Folder Link(s): INA220