TEST datasheet(17/49 Pages) ETC

Part #	TEST

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

PDF	49 Pages

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Manufacturer	ETC [List of Unclassifed Manufacturers]

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PCAL6408A

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Product data sheet

Rev. 3 — 18 September 2013

17 of 49

NXP Semiconductors

PCAL6408A

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

Transfer of data can be stopped at any time by a STOP condition. When this occurs, data present at the latest acknowledge

phase is valid (output mode). It is assumed that the command byte has previously been programmed with 00h (read Input port

This figure eliminates the command byte transfer, a restart, and slave address call between the initial slave address call and

actual data transfer from P port (see Figure 12).

Fig 14. Read Input port register (latch enabled)

10000

slave address

START condition

R/W

acknowledge from slave

002aah091

data from port

acknowledge from master

SDA

no acknowledge

from master

read from

port

data into

port

data from port

DATA 1

INT

DATA 2

STOP

condition

tv(INT)

trst(INT)

th(D)

tsu(D)

12345678

SCL

DATA 1

INT is cleared by

read from port

STOP not needed

to clear INT

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