PCA9555 查看數據表（PDF） - NXP Semiconductors.
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PCA9555 Datasheet PDF : 34 Pages
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NXP Semiconductors
PCA9555
16-bit I2C-bus and SMBus I/O port with interrupt
5.2 Pin description
Table 3.
Symbol
INT
A1
A2
IO0_0
IO0_1
IO0_2
IO0_3
IO0_4
IO0_5
IO0_6
IO0_7
VSS
IO1_0
IO1_1
IO1_2
IO1_3
IO1_4
IO1_5
IO1_6
IO1_7
A0
SCL
SDA
VDD
Pin description
Pin
DIP24, SO24,
SSOP24, TSSOP24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Description
HVQFN24,
HWQFN24
22
interrupt output (open-drain)
23
address input 1
24
address input 2
1
port 0 input/output
2
3
4
5
6
7
8
9[1]
supply ground
10
port 1 input/output
11
12
13
14
15
16
17
18
address input 0
19
serial clock line
20
serial data line
21
supply voltage
[1] HVQFN and HWQFN package die supply ground is connected to both the VSS pin and the exposed center
pad. The 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.
PCA9555_8
Product data sheet
Rev. 08 — 22 October 2009
© NXP B.V. 2009. All rights reserved.
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