PCA9534DW REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER led light circuit boards

PCA9534DW REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER led light circuit boards

FEATURES

• Low Standby Current Consumption of  µA Max

• I 2C to Parallel Port Expander

•Open-Drain Active-Low Interrupt Output

• Operating Power-Supply Voltage Range of 2.3 V to 5.5 V

• 5-V Tolerant I/O Ports

• 400-kHz Fast I 2C Bus

• Three Hardware Address Pins Allow up to Eight Devices on the I 2C/SMBus 

• Input/Output Configuration Register

•Polarity Inversion Register

DESCRIPTION/ORDERING INFORMATION

This 8-bit I/O expander for the two-line bidirectional bus (I 2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I 2C interface [serial clock (SCL), serial data (SDA)].

The PCA9534 consists of one 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low) register. At power on, the I/Os are configured as inputs. However, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding Input or Output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.

The system master can reset the PCA9534 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I 2C/SMBus state machine

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