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This 4-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 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 pullup 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 pullup 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.
The system master can reset the PCA9536 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 I2C/SMBus state machine.
The device's outputs (latched) have high-current drive capability for directly driving LEDs. It has low current consumption.
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | PCA9536 Remote 4-Bit I²C and SMBus I/O Expander With Configuration Registers datasheet (Rev. G) | 12 Jun 2014 |
| Application note | I2C Dynamic Addressing | 25 Apr 2019 | |
| Selection guide | Logic Guide (Rev. AB) | 12 Jun 2017 | |
| Application note | Choosing the Correct I2C Device for New Designs | 07 Sep 2016 | |
| Application note | Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) | 02 Dec 2015 | |
| Application note | Understanding the I2C Bus | 30 Jun 2015 | |
| Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 15 May 2015 | |
| Application note | I2C Bus Pull-Up Resistor Calculation | 13 Feb 2015 | |
| Application note | Programming Fun Lights With TI's TCA6507 | 30 Nov 2007 | |
| Application note | Semiconductor Packing Material Electrostatic Discharge (ESD) Protection | 08 Jul 2004 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
| VSSOP (DGK) | 8 | View options |
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