PCA9554A(2006) 查看數據表（PDF） - NXP Semiconductors.
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PCA9554A Datasheet PDF : 30 Pages
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NXP Semiconductors
PCA9554/PCA9554A
8-bit I2C-bus and SMBus I/O port with interrupt
5.2 Pin description
Table 2.
Symbol
A0
A1
A2
IO0
IO1
IO2
IO3
VSS
IO4
IO5
IO6
IO7
INT
SCL
SDA
VDD
n.c.
Pin description
Pin
DIP16, SO16,
HVQFN16 SSOP20
SSOP16, TSSOP16
1
15
6
2
16
7
3
1
9
4
2
10
5
3
11
6
4
12
7
5
14
8
6[1]
15
9
7
16
10
8
17
11
9
19
12
10
20
13
11
1
14
12
2
15
13
4
16
14
5
-
-
3, 8, 13, 18
Description
address input 0
address input 1
address input 2
input/output 0
input/output 1
input/output 2
input/output 3
supply ground
input/output 4
input/output 5
input/output 6
input/output 7
interrupt output (open-drain)
serial clock line
serial data line
supply voltage
not connected
[1] HVQFN package die supply ground is connected to both VSS pin and exposed center pad. VSS pin must be
connected to supply ground for proper device operation. For enhanced thermal, electrical, and board level
performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the
board and for proper heat conduction through the board, thermal vias need to be incorporated in the PCB in
the thermal pad region.
6. Functional description
Refer to Figure 1 “Block diagram of PCA9554/PCA9554A”.
6.1 Registers
6.1.1 Command byte
Table 3. Command byte
Command Protocol
0
read byte
1
read/write byte
2
read/write byte
3
read/write byte
Function
Input Port register
Output Port register
Polarity Inversion register
Configuration register
The command byte is the first byte to follow the address byte during a write transmission.
It is used as a pointer to determine which of the following registers will be written or read.
PCA9554_9554A_7
Product data sheet
Rev. 07 — 13 November 2006
© NXP B.V. 2006. All rights reserved.
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