PCF8575
REMOTE 16-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT
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SCPS121C–JANUARY 2005–REVISED OCTOBER 2006
PARAMETER MEASUREMENT INFORMATION
V
CC
R
L
= 1 kΩ
SDA
DUT
C
L
= 50 pF
SDA LOAD CONFIGURATION
3 Bytes for Complete Device
Programming
Stop
Start
Address
Bit 7
(MSB)
R/W
Bit 0
(LSB)
Data
Bit 07
(MSB)
Data
Bit 10 Condition
(LSB)
Stop
ACK
(A)
Address
Bit 6
Address
Bit 1
Condition Condition
(P) (S)
(P)
t
scl
t
sch
0.7 × V
0.3 × V
CC
SCL
SDA
CC
t
icr
t
sts
t
PHL
t
icf
t
buf
t
t
sp
PLH
0.7 × V
0.3 × V
CC
CC
t
icf
t
icr
t
sdh
t
sps
t
sth
t
sds
Repeat
Start
Condition
Stop
Condition
Start or
Repeat
Start
Condition
VOLTAGE WAVEFORMS
BYTE
DESCRIPTION
2
1
I C address
2, 3
P-port data
Figure 6. I2C Interface Load Circuit and Voltage Waveforms
13
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