Datasheet

PCA9570 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4 — 17 September 2014 19 of 32
NXP Semiconductors
PCA9570
Remote 4-bit general purpose outputs for 1 MHz I
2
C-bus
15. Parameter measurement information
a. SDA load configuration
b. Transaction format
c. Voltage waveforms
C
L
includes probe and jig capacitance.
All inputs are supplied by generators having the following characteristics: PRR  10 MHz; Z
o
=50; t
r
/t
f
 30 ns.
All parameters and waveforms are not applicable to all devices.
Byte 1 = I
2
C-bus address; Byte 2, byte 3 = P port data.
(1) See Figure 13
.
Fig 24. I
2
C-bus interface load circuit and voltage waveforms
002aag803
DUT
C
L
= 50 pF
R
L
= 1 kΩ
SDA
V
DD
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
t
LOW
t
HIGH
t
r
t
f
0.7 × V
DD
0.3 × V
DD
0.7 × V
DD
0.3 × V
DD
t
SP
t
BUF
t
f
t
HD;STA
t
r
SCL
SDA
t
SU;DAT
t
HD;DAT
t
f(o)
t
VD;ACK
t
VD;DAT
t
VD;ACK
t
SU;STA
t
SU;STO
002aag804
repeat START condition
STOP condition