DESCRIPTION/ORDERING INFORMATION
●This 8-bit I/O expander for the two-line bidirectional bus (I2C) 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 I2C interface [serial clock (SCL), serial data (SDA)]. The PCA9534A 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.
●FEATURES
●• Low Standby Current Consumption of 1 µA Max
●• I2C 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 I2C Bus
●• Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
●• Input/Output Configuration Register
●• Polarity Inversion Register
●• Internal Power-On Reset
●• Power-Up With All Channels Configured as Inputs
●• No Glitch on Power-Up
●• Noise Filter on SCL/SDA Inputs
●• Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
●• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
