PCA9570DP datasheet(19/32 Pages) NXP

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PCA9570

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Product data sheet

Rev. 4 — 17 September 2014

19 of 32

NXP Semiconductors

PCA9570

Remote 4-bit general purpose outputs for 1 MHz I2C-bus

15. Parameter measurement information

a. SDA load configuration

b. Transaction format

c. Voltage waveforms

CL includes probe and jig capacitance.

All inputs are supplied by generators having the following characteristics: PRR

 10 MHz; Z

o =50 ; tr/tf  30 ns.

All parameters and waveforms are not applicable to all devices.

Byte 1 = I2C-bus address; Byte 2, byte 3 = P port data.

(1) See Figure 13.

Fig 24. I2C-bus interface load circuit and voltage waveforms

002aag803

DUT

CL = 50 pF

RL = 1 kΩ

SDA

VDD

STOP

condition

(P)

Data

Bit 0

(LSB)

Data

Bit 7

(MSB)

ACK

(A)

R/W

Bit 0

(LSB)

Address

Bit 1

Address

Bit 7

(MSB)

START

condition

(S)

STOP

condition

(P)

two bytes for read Input port register(1)

002aag952

tLOW

tHIGH

0.7 × VDD

0.3 × VDD

0.7 × VDD

0.3 × VDD

tSP

tBUF

tHD;STA

SCL

SDA

tSU;DAT

tHD;DAT

tf(o)

tVD;ACK

tVD;DAT

tVD;ACK

tSU;STA

tSU;STO

002aag804

repeat START condition

STOP condition

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