Interfaces
I²C, SPI, Serial Interface Devices
I²C General Purpose I/O
- PCA6408A
- PCA6416A
- PCA8574_74A
- PCA8575
- PCA9500
- PCA9501
- PCA9502BS
- PCA9505_06
- PCA9534
- PCA9535A
- PCA9535_PCA9535C
- PCA9536
- PCA9537DP
- PCA9538
- PCA9538A
- PCA9539A
- PCA9539_PCA9539R
- PCA9554B_PCA9554C
- PCA9554_PCA9554A
- PCA9555
- PCA9555A
- PCA9557
- PCA9570
- PCA9571
- PCA9574
- PCA9575
- PCA9621
- PCA9670BS
- PCA9670D
- PCA9670PW
- PCA9671
- PCA9672
- PCA9673
- PCA9674_PCA9674A
- PCA9675
- PCA9698
- 18 V tolerant SPI 16-bit/8-bit GPI with INT
- PCA9701_PCA9702
- PCA9703
- PCA9704PW
- PCAL6408A
- PCAL6416A
- PCAL6416AEX
- PCAL6534
- PCAL9535A
- PCAL9538A
- PCAL9539A
- PCAL9554B; PCAL9554C
- PCAL9555A
- PCF8574_74A
- PCF8575

I²C General Purpose I/O (GPIO)

Our industry-leading General Purpose I/O (GPIO) expanders provide 4, 8, 16, 24, or 40 general-purpose I/O pins for the CPU via the I²C-bus to help designers reduce board space and complexity while simplifying software development and lowering overall system cost.

Our agile I²C GPIO includes features to eliminate external components as pull-up resistors, open-drain outputs, output drive control, and input latches to permit faster software development and more robust firmware performance. These GPIOs work with I²C and SPI interfaces and with applications such as: keyboards, IO expansion, driving LED and signal monitoring.

Featured Products

Part Number	Description	No of Bits	V_DD (V)	Datasheet	Order
PCAL6534	Ultra-low-voltage, level translating, 34-bit I²C-bus/SMBus I/O expander	34	0.8 V to 3.6 V	PDF (2.5 MB)	Buy
PCAL6524	Ultra-low-voltage Fm+ I²C-bus, SMBus I/O expander	24	0.8 to 5.5	PDF (2.3 MB)	Buy
PCAL6416A	Low-voltage translating Fm I²C-bus, SMBus I/O expander	16	1.65 to 5.5	PDF (3.1 MB)	Buy
PCAL6408A	Low-voltage Fm I²C-bus, SMBus I/O expander	8	1.65 to 5.5	PDF (2.7 MB)	Buy
PCA9570	Remote 1 MHz I²C GPIO	4	1.1 to 3.6	PDF (1.7 MB)	Buy
PCA9555A	Low-voltage Fm I²C-bus I/O port with interrupt and weak pull-up	16	1.65 to 5.5	PDF (2.4 MB)	Buy

Filter I²C General Purpose I/O by Parameter

System Management I2C and SPI Selector Guide 2018 Image

System Management I²C and SPI Selector Guide 2018

Selector Guide of interface components for all your design needs.

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Solutions Around the Core – Secure Interfaces and Power

Discover other solutions we offer for your designs.

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24-bit GPIO with GUI interface

Emmanuel Nana talks us about the usage of the PCALxxxx device to expand GPIO count (03:44).

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What's New

PCAL6534 / 90-Second Crash Course

The PCAL6534 is a 34-bit general-purpose I/O expander that provides remote I/O expansion for most microcontroller families via the Fast-mode Plus (Fm+) I²C-bus interface.