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INA260

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SBOS656C – JULY 2016 – REVISED DECEMBER 2016

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Copyright © 2016, Texas Instruments Incorporated

(1)

Type: R = Read-Only, R/W = Read/Write.

8.5.3.4 SMBus Alert Response

When SMBus Alerts are latched, the INA260 is designed to respond to the SMBus Alert Response address. The

SMBus Alert Response provides a quick fault identification for simple slave devices. When an Alert occurs, the

master can broadcast the Alert Response slave address (0001 100) with the Read/Write bit set high. Following

this Alert Response, any slave device that generates an alert identifies itself by acknowledging the Alert

Response and sending its address on the bus.

The Alert Response can activate several different slave devices simultaneously, similar to the I2C General Call. If

more than one slave attempts to respond, bus arbitration rules apply and the device with the lowest address will

win and be serviced first. The losing devices do not generate an Acknowledge and continues to hold the Alert

line low until the interrupt is cleared. The winning device responds with its address and releases the SMBus alert

line. Even though the INA260 releases the SMBus line the internal error flags are not cleared until done so by

the host.

8.6 Register Maps

The INA260 uses a bank of registers for holding configuration settings, measurement results, minimum/maximum

limits, and status information. Table 4 summarizes the device registers; see the Functional Block Diagram

section for an illustration of the registers.

Table 4. Register Set Summary

POINTER

ADDRESS

REGISTER NAME

FUNCTION

POWER-ON RESET

TYPE(1)

HEX

BINARY

HEX

00h

Configuration Register

All-register reset, shunt voltage and bus

voltage ADC conversion times and

averaging, operating mode.

01100001 00100111

6127

R/W

01h

Current Register

Contains the value of the current flowing

through the shunt resistor.

00000000 00000000

0000

R

02h

Bus Voltage Register

Bus voltage measurement data.

00000000 00000000

0000

R

03h

Power Register

Contains the value of the calculated

power being delivered to the load.

00000000 00000000

0000

R

06h

Mask/Enable Register

Alert configuration and Conversion

Ready flag.

00000000 00000000

0000

R/W

07h

Alert Limit Register

Contains the limit value to compare to

the selected Alert function.

00000000 00000000

0000

R/W

FEh

Manufacturer ID Register

Contains unique manufacturer

identification number.

0101010001001001

5449

R

FFh

Die ID Register

Contains unique die identification

number.

0010001001110000

2270

R

8.6.1 Configuration Register (00h) (Read/Write)

The Configuration Register settings control the operating modes for the device. This register controls the

conversion time settings for both shunt current 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 halts 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 (00h). This halt prevents any uncertainty in the conditions used for the next completed conversion.