SCLK

MISO

CS

MOSI

ADDR

5

ADDR

4

ADDR

3

ADDR

2

ADDR

1

ADDR

0

DATA

MSB

DATA

DATA

DATA

DATA

DATA

DATA

DATA

LSB

W

. . . . . .

. . . .

16 bits

DATA

MSB

DATA

DATA

DATA

DATA

DATA

DATA

DATA

LSB

. . . .

. . . . .

Figure 7-8. SPI Write Frame

Note that while the read frame can be variable in length due to the different length registers in the INA239

device, the write frame is fixed in length as all writable registers are 16 bits wide. During an SPI write frame,

while new data is shifted into the INA239 register, the old data from the same register is shifted out on the MISO

line.

The first 8-bits of each SPI frame are presented in Table 7-2, which shows access to a certain register address

on the MOSI line as well as read/write functionality. On an SPI read operation, the INA239 returns the data read

in the same SPI frame.

Table 7-2. First 8-MSB Bits of SPI Frame

COMMAND

b7

b6

b5

b4

b3

b2

b1

b0

READ

ADDR5

ADDR4

ADDR3

ADDR2

ADDR1

ADDR0

0

1

WRITE

0

7.6 Register Maps

7.6.1 INA239 Registers

Table 7-3 lists the INA239 registers. All register locations not listed in Table 7-3 should be considered as

reserved locations and the register contents should not be modified.

Table 7-3. INA239 Registers

Address Acronym

Register Name

Register Size (bits)

Section

0h

CONFIG

Configuration

16

Go

1h

ADC_CONFIG

ADC Configuration

16

Go

2h

SHUNT_CAL

Shunt Calibration

16

Go

4h

VSHUNT

Shunt Voltage Measurement

16

Go

5h

VBUS

Bus Voltage Measurement

16

Go

6h

DIETEMP

Temperature Measurement

16

Go

7h

CURRENT

Current Result

16

Go

8h

POWER

Power Result

24

Go

Bh

DIAG_ALRT

Diagnostic Flags and Alert

16

Go

Ch

SOVL

Shunt Overvoltage Threshold

16

Go

Dh

SUVL

Shunt Undervoltage Threshold

16

Go

Eh

BOVL

Bus Overvoltage Threshold

16

Go

Fh

BUVL

Bus Undervoltage Threshold

16

Go

10h

TEMP_LIMIT

Temperature Over-Limit

Threshold

16

Go

11h

PWR_LIMIT

Power Over-Limit Threshold

16

Go

3Eh

MANUFACTURER_ID

Manufacturer ID

16

Go

3Fh

DEVICE_ID

Device ID

16

Go

www.ti.com

INA239

SLYS027 – JANUARY 2021

Copyright © 2021 Texas Instruments Incorporated

Submit Document Feedback

19

Product Folder Links: INA239