PCA9554U,029 NXP Semiconductors, PCA9554U,029 Datasheet - Page 6

• Manufacturer Part Number: PCA9554U,029
• Description: I2C Interface IC PCA9554U/UNCASED/PUT
• Manufacturer: NXP Semiconductors

Specifications of PCA9554U,029

• Factory Pack Quantity: 7000

NXP Semiconductors
6. Functional description
PCA9554_9554A
Product data sheet
6.1.1 Command byte
5.2 Pin description
6.1 Registers
Table 3.
[1]
Refer to
Table 4.
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.
Symbol
A0
A1
A2
IO0
IO1
IO2
IO3
V
IO4
IO5
IO6
IO7
INT
SCL
SDA
n.c.
Command
0
1
2
3
V
SS
DD
HVQFN16 package die supply ground is connected to both V
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.
Figure 1 “Block diagram of
Pin
SO16, SSOP16,
TSSOP16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
-
Pin description
Command byte
Protocol
read byte
read/write byte
read/write byte
read/write byte
All information provided in this document is subject to legal disclaimers.
Rev. 9 — 19 March 2013
15
16
1
2
3
4
5
7
8
9
10
13
-
HVQFN16 SSOP20
6
11
12
14
[1]
Function
Input Port register
Output Port register
Polarity Inversion register
Configuration register
PCA9554/PCA9554A”.
6
7
9
10
11
12
14
15
16
17
19
20
1
2
4
5
3, 8, 13, 18
8-bit I
PCA9554; PCA9554A
2
C-bus and SMBus I/O port with interrupt
SS
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
pin and exposed center pad. V
© NXP B.V. 2013. All rights reserved.
SS
pin must
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