9538 Ver la hoja de datos (PDF) - NXP Semiconductors.

Número de pieza

componentes Descripción

Fabricante

9538

8-bit I2C-bus and SMBus low power I/O port with interrupt and reset

NXP Semiconductors. 

NXP Semiconductors

PCA9538

8-bit I2C-bus and SMBus low power I/O port with interrupt and reset

SDA

tBUF

SCL

tr

tLOW

tHD;STA

P

S

tHD;DAT

tf

tHIGH

tSU;DAT

Fig 14. Definition of timing

tHD;STA

tSP

tSU;STA

Sr

tSU;STO

P

002aaa986

protocol

START

condition

(S)

bit 7

MSB

(A7)

bit 6

(A6)

SCL

SDA

tSU;STA

tBUF

tLOW tHIGH

1 / fSCL

tr

tf

bit 1

(D1)

bit 0

(D0)

acknowledge

(A)

STOP

condition

(P)

tHD;STA

tSU;DAT tHD;DAT

Rise and fall times refer to VIL and VIH.

Fig 15. I2C-bus timing diagram

tVD;DAT

tVD;ACK

tSU;STO

002aab285

START

SCL

SDA

RESET 50 %

IOn

30 %

trec(rst)

Fig 16. Definition of RESET timing

PCA9538_5

Product data sheet

ACK or read cycle

trst

50 %

tw(rst)

50 %

trst

50 %

after reset,

I/Os reconfigured

as inputs

002aad732

Rev. 05 — 28 May 2009

© NXP B.V. 2009. All rights reserved.

16 of 28

Share Link: