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 (continued)
V
CC
R
L
= 4.7 kΩ
INT
DUT
C
L
= 100 pF
INTERRUPT LOAD CONFIGURATION
ACK
From Slave
ACK
From Slave
Start
Condition
16 Bits
(2 Data Bytes)
R/W
From Port
Slave Address (PCF8575)
Data From Port
Data 3
A
2
A A
1 0
S
0
1
0
0
1
A
Data 1
Data 2
A
1
P
1
2
3
4
5
6
7
8
A
A
t
ir
B
B
t
ir
INT
A
t
iv
t
sps
A
Data
Into
Port
Address
Data 1
Data 2
Data 3
0.7 × V
0.3 × V
CC
0.7 × V
0.3 × V
CC
SCL
INT
INT
R/W
A
CC
CC
t
iv
t
ir
0.7 × V
0.7 × V
CC
CC
P
n
0.3 × V
0.3 × V
CC
CC
View A−A
View B−B
Figure 7. Interrupt Load Circuit and Voltage Waveforms
14
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