The PCA9538PW is an 8-bit I/O Expander for the two-line bidirectional bus (I²C) is designed for 2.3 to 5.5V 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 PCA9538 consists of one 8-bit Configuration (input or output selection), input port, output port and polarity inversion (active high or active low) registers. 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 Port or Output Port 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 PCA9538 in the event of a timeout or other improper operation by asserting a low in the RESET input.
● Open-drain active-low interrupt (INT)\ output
● Active-Low Reset Input
● Two hardware address pins allow up to four devices on the I²C/SMBus
● Input/output configuration register
● Polarity inversion register
● Power-up with all channels configured as inputs
● No glitch on power-up
● Noise filter on SCL/SDA input
● Latched outputs with high-current drive maximum capability for directly driving LEDs
● Latch-up performance exceeds 100mA per JESD 78, class II
● 1µA Maximum low standby current consumption
● 400kHz Fast I²C bus
● Green product and no Sb/Br
●Device has limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
