PCA9555
REMOTE 16-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
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SCPS131D–AUGUST 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
(Two Data Bytes)
R/W
From Port
Slave Address (PCA9555)
Data From Port
Data 3
A2 A1 A0
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
Pn
R/W
A
CC
CC
t
iv
t
ir
0.7 × V
0.7 × V
CC
CC
0.3 × V
0.3 × V
CC
CC
View A−A
A. CL includes probe and jig capacitance.
View B−B
B. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr/tf ≤ 30 ns.
C. All parameters and waveforms are not applicable to all devices.
Figure 12. Interrupt Load Circuit and Voltage Waveforms
19
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