ADBMS2950BCCSZ datasheet(59/97 Pages) AD

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Data Sheet

ADBMS2950B

Rev. 0 | Page 59 of 97

•

When set to open-drain mode through GPOxOD = 1

and to high-impedance state through GPOxC = 1, the

GPOs become inputs effectively.

•

GPO6 can be configured to output 200 kHz, 50%

duty-cycle square wave signal (GPO6C).

The ADBMS2950B features four GPIO pins to fulfill the

following functions:

•

General-purpose static input/output signals.

•

Connectivity to local SPI or I2C peripheral (see

COMM Interface).

•

Fault Output.

The GPIOs provide the following features:

•

Open-drain output control up to VREG voltage

(GPIO1C to GPIO4C).

•

Single-threshold readback (GPIO1L to GPIO4L).

•

GPIO1 can output the fault status of the device

(GPIO1FE).

•

GPIO2 can signal the end-of-conversion of the

OC1ADC (GPIO2EOC).

An external SPI or I2C peripheral can be connected to the

GPIO/GPO pins. Often, this is an EEPROM to store calibration

data, for example, the shunt resistance value of the ratios of

external resistive dividers. Access to external serial peripheral

devices is provided through the COMM commands controlled

by the host.

The following serial controller interface connections are

supported:

•

I2C peripheral devices.

•

3-wire SPI peripheral devices.

•

4-wire SPI peripheral devices.

Additional chip-select lines for SPI communication can be

provided through the GPOs.

GPO Operation

The six GPOs are controlled through the configuration A

(GPO1OD to GPO6OD) and output state control bits (GPO1C

to GPO6C) for each individual GPOx pin. Additionally, for the

GPO6, a clock output mode can be activated through its 2-bit

GPO6C configuration bit field. After reset, all GPOs default to

the high-impedance mode.

Figure 41. GPO Model

Notes:

1. The GPO6L and GPO6H bits are not defined, where

GPO6 has been configured in clock output mode.

2. The GPOxL and GPOxH read-only bits are

redundantly read by SPI1 and SPI2 and can trigger a

false SPIFLT event if GPO is exposed to dynamic

signals or to extreme time constants.

3. When a GPOx pin is configured in open-drain mode

and externally pulled up to a voltage lower than VDD,

the GPOxH readback bit should not be used.

Table 79. Relation of GPOxOD, GPOxC Configuration to

GPOx Mode and State

GPOxOD

GPOxC

GPOx Mode

GPOx State

Push-Pull

Pull low to GND.

Push-Pull

Push high to VDD.

Open-Drain

Pull low to GND.

Open-Drain

High impedance.

The status of the six GPOs is available in the STAT register and

can be readback with the RDSTAT command. There are two

read-only bits for each GPO, reporting two different threshold

levels:

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