INA229 datasheet(18/48 Pages) TI

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Shunt Voltage

Temperature

Bus Voltage

ALERT

(ALATCH = 0)

(APOL = 0)

(CNVR = 1)

Power

Shunt Over Voltage Threshold

Bus Under Voltage Threshold

Over Temp Threshold

Power Over Limit Threshold

BUV

SET

SOV

SET

BUV

CLEAR

SOV

BUV

SET

SOV

CLEAR

BUV

SET

BUV

SET

- No diag. error -

Conversion Complete

Reported

Figure 7-6. Multi-Alert Configuration

7.4 Device Functional Modes

7.4.1 Shutdown Mode

In addition to the two conversion modes (continuous and triggered), the device also has a shutdown mode

(selected by the MODE bits in ADC_CONFIG register) that reduces the quiescent current to less than 5 µA and

turns off current into the device inputs, reducing the impact of supply drain when the device is not being used.

The registers of the device can be written to and read from while the device is in shutdown mode. The device

remains in shutdown mode until another triggered conversion command or continuous conversion command is

received.

The device can be triggered to perform conversions while in shutdown mode. When a conversion is triggered,

the ADC will start conversion; once conversion completes the device will return to the shutdown state.

Note that the shutdown current is specified with an inactive communications bus. Active clock and data activity

will increase the current consumption as a function of the bus frequency as shown in Shutdown IQ vs. Clock

Frequency.

7.4.2 Power-On Reset

Power-on reset (POR) is asserted when VS drops below 1.26V (typical) at which all of the registers are reset to

their default values. A manual device reset can be initiated by setting the RST bit in the CONFIG register. The

default power-up register values are shown in the reset column for each register description. Links to the register

descriptions are shown in Section 7.6.

7.5 Programming

7.5.1 Serial Interface

The primary communication between the INA229-Q1 and the external MCU is through the SPI bus, which

provides full-duplex communications in a main-secondary configuration. The external MCU is always the primary

or main SPI device, sending command requests on the MOSI pin, and receiving device responses on the MISO

pin. The INA229-Q1 is always an SPI secondary device, receiving command requests and sending responses

(status, measured values) to the external MCU over the MISO pin.

• SPI is a 4-pin interface with pins as:

– CS - SPI Chip Select (input)

– SCLK - SPI Clock (input)

– MOSI - SPI Secondary In / Main Out data (input)

INA229-Q1

SLYS024A – MAY 2020 – REVISED JUNE 2021

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