PCA9538ABSHP NXP Semiconductors, PCA9538ABSHP Datasheet - Page 5

• Manufacturer Part Number: PCA9538ABSHP
• Description: Interface - I/O Expanders 8bit I2C IO Port
• Manufacturer: NXP Semiconductors

Specifications of PCA9538ABSHP

• Maximum Operating Frequency: 100 kHz
• Operating Supply Voltage: 1.65 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: HVQFN-16
• Operating Current: 160 mA
• Output Current: 25 mA
• Power Dissipation: 200 mW
• Product Type: I/O Expanders

NXP Semiconductors
6. Functional description
Table 4.
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PCA9538A
Product data sheet
B7
0
0
0
0
Undefined.
B6
0
0
0
0
Pointer register bits
Command byte
B5
0
0
0
0
B4
6.1 Device address
6.2 Pointer register and command byte
0
0
0
0
B3
0
0
0
0
Refer to
A1 and A0 are the hardware address package pins and are held to either HIGH (logic 1)
or LOW (logic 0) to assign one of the four possible slave addresses. The last bit of the
slave address (R/W) defines the operation (read or write) to be performed. A HIGH
(logic 1) selects a read operation, while a LOW (logic 0) selects a write operation.
Following the successful acknowledgement of the address byte, the bus master sends a
command byte, which is stored in the Pointer register in the PCA9538A. Two bits of this
data byte state the operation (read or write) and the internal registers (Input, Output,
Polarity Inversion, or Configuration) that will be affected. Bit 6 in conjunction with the lower
three bits of the Command byte are used to point to the extended features of the device
(Agile I/O). This register is write only.
Fig 4.
Fig 5.
B2
0
0
0
0
B1
Figure 1 “Block diagram of
0
0
1
1
PCA9538A address
Pointer register bits
B0
0
1
0
1
All information provided in this document is subject to legal disclaimers.
Command byte
(hexadecimal)
Rev. 1 — 28 September 2012
00h
01h
02h
03h
Low-voltage 8-bit I
B7
1
B6
Input port
Output port
Polarity Inversion
Configuration
Register
1
PCA9538A”.
fixed
slave address
B5
1
B4
0
B3
0
2
C-bus I/O port with interrupt and reset
selectable
hardware
A1
B2
002aae707
A0
B1
002aaf540
R/W
B0
Protocol
read byte
read/write byte
read/write byte
read/write byte
PCA9538A
© NXP B.V. 2012. All rights reserved.
1111 1111
0000 0000
1111 1111
Power-up
default
xxxx xxxx
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