TEST datasheet(1/49 Pages) ETC

Part #	TEST

Description	Low-voltage translating, 8-bit I2C-bus/SMBus I/O expander with interrupt output, reset, and configuration registers

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General description

The PCAL6408A is an 8-bit general-purpose I/O expander that provides remote I/O

expansion for most microcontroller families via the I2C-bus interface.

NXP I/O expanders provide a simple solution when additional I/Os are needed while

keeping interconnections to a minimum, for example, in battery-powered mobile

applications for interfacing to sensors, push buttons, keypad, etc. In addition to providing

a flexible set of GPIOs, it simplifies interconnection of a processor running at one voltage

level to I/O devices operating at a different (usually higher) voltage level. The PCAL6408A

has built-in level shifting feature that makes these devices extremely flexible in mixed

signal environments where communication between incompatible I/O voltages is required.

Its wide VDD range of 1.65 V to 5.5 V on the dual power rail allows seamless

communications with next-generation low voltage microprocessors and microcontrollers

on the interface side (SDA/SCL) and peripherals at a higher voltage on the port side.

There are two supply voltages for PCAL6408A: VDD(I2C-bus) and VDD(P). VDD(I2C-bus)

provides the supply voltage for the interface at the master side (for example, a

microcontroller) and the VDD(P) provides the supply for core circuits and Port P. The

bidirectional voltage level translation in the PCAL6408A is provided through VDD(I2C-bus).

VDD(I2C-bus) should be connected to the VDD of the external SCL/SDA lines. This indicates

the VDD level of the I2C-bus to the PCAL6408A, while the voltage level on Port P of the

PCAL6408A is determined by the VDD(P).

The PCAL6408A contains the PCA6408A register set of 8-bit Configuration, Input, Output,

and Polarity Inversion registers and additionally, the PCAL6408A has Agile I/O, which are

additional features specifically designed to enhance the I/O. These additional features

are: programmable output drive strength, latchable inputs, programmable

pull-up/pull-down resistors, maskable interrupt, interrupt status register, programmable

open-drain or push-pull outputs. The PCAL6408A is a pin-to-pin replacement to the

PCA6408A, however, the PCAL6408A powers up with all I/O interrupts masked. This

mask default allows for a board bring-up free of spurious interrupts at power-up.

At power-on, the I/Os are configured as inputs. However, the system master can enable

the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for

each input or output is kept in the corresponding input or output register. The polarity of

the Input Port register can be inverted with the Polarity Inversion register, saving external

logic gates. Programmable pull-up and pull-down resistors eliminate the need for discrete

components.

PCAL6408A

Low-voltage translating, 8-bit I2C-bus/SMBus I/O expander

with interrupt output, reset, and configuration registers

Rev. 3 — 18 September 2013

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NXP Semiconductors	PCA6408A	2Mb / 40P	Low-voltage, 8-bit I2C-bus and SMBus I/O expander with interrupt output, reset, and configuration registers Rev. 1-27 September 2012
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Texas Instruments	TCAL6408	1Mb / 48P	TCAL6408 8-Bit Translating I2C-Bus, SMBus I/O Expander With Interrupt Output, Reset, and Agile I/O Configuration Registers REVISED NOVEMBER 2023
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