Datasheet

INA226
SBOS547 –JUNE 2011 www.ti.com
REGISTER DETAILS
All 16-bit INA226 registers are two 8-bit bytes via the I
2
C interface.
Configuration Register 00h (Read/Write)
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
RST — — — AVG2 AVG1 AVG0 V
BUS
CT2 V
BUS
CT1 V
BUS
CT0 V
SH
CT2 V
SH
CT1 V
SH
CT0 MODE3 MODE2 MODE1
NAME
POR
0 1 0 0 0 0 0 1 0 0 1 0 0 1 1 1
VALUE
The Configuration Register settings control the operating modes for the INA226. This register controls the
conversion time settings for both the shunt and bus voltage measurements as well as the averaging mode used.
The operating mode that controls what signals are selected to be measured is also programmed in the
Configuration Register.
The Configuration Register can be read from at any time without impacting or affecting the device settings or a
conversion in progress. Writing to the Configuration Register will halt any conversion in progress until the write
sequence is completed resulting in a new conversion starting based on the new contents of the Configuration
Register. This prevents any uncertainty in the conditions used for the next completed conversion.
Bit Descriptions
RST: Reset Bit
Bit 15 Setting this bit to '1' generates a system reset that is the same as power-on reset. Resets all registers to default
values; this bit self-clears.
AVG: Averaging Mode
Bits 9–11 Sets the number of samples that will be collected and averaged together. Table 3 summarizes the AVG bit settings
and related number of averages for each bit.
Table 3. AVG Bit Settings[11:9]
(1)
AVG2 AVG1 AVG0 NUMBER OF
D11 D10 D9 AVERAGES
0 0 0 1
0 0 1 4
0 1 0 16
0 1 1 64
1 0 0 128
1 0 1 256
1 1 0 512
1 1 1 1024
(1) Shaded values are default.
18 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): INA226