The PCA9536D is a remote 4-bit I²C and SMBus I/O Expander with configuration registers designed for 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 PCA9536 features 4-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 with a weak pull up to VCC. However, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. If no signals are applied externally to the PCA9536, the voltage level is 1 or high, because of the internal pull up resistors. The data for each input or output is stored 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.
1µA Maximum low standby-current consumption
I²C to parallel port expander
Input/output configuration register
Polarity inversion register
Internal power-on reset
No glitch on power up
Power-up with all channels configured as inputs
Noise filter on SCL/SDA inputs
Latch-up performance exceeds 100mA per JESD 78
ESD protection exceeds JESD 22
Green product and no Sb/Br
This device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
