Datasheet

INA220

SBOS459D –JUNE 2009–REVISED SEPTEMBER 2010

www.ti.com

The INA220 uses a bank of registers for holding Register contents are updated 4ms after completion of

configuration settings, measurement results, the write command. Therefore, a 4ms delay is

maximum/minimum limits, and status information. required between completion of a write to a given

Table 3 summarizes the INA220 registers; Figure 13 register and a subsequent read of that register

illustrates the registers. (without changing the pointer) when using SCL

frequencies in excess of 1MHz.

Table 3. Summary of Register Set

POINTER

ADDRESS POWER-ON RESET

HEX REGISTER NAME FUNCTION BINARY HEX TYPE

(1)

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

(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.

Product Folder Link(s): INA220