Overview
The PCA9534PW is a low-power, 8-bit I2C and SMBus I/O expander produced by Texas Instruments. This device is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface. It operates within a power-supply voltage range of 2.3 V to 5.5 V, making it versatile for various applications. The PCA9534PW is particularly notable for its low standby current consumption, high-current drive capability, and robust ESD protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 2.3 to 5.5 | V |
| I2C Bus Frequency | 400 kHz | |
| Number of I/Os | 8 | |
| Package Type | TSSOP-16 | |
| Standby Current Consumption | 1 μA (Max) | |
| ESD Protection | 2000-V Human-body model, 200-V Machine model, 1000-V Charged-device Model | |
| Output Drive Capability | Up to 25 mA per I/O, 200 mA total for all I/Os | |
| Interrupt Output | Open-drain active-low |
Key Features
- Low standby current consumption of 1 μA Max.
- I2C to parallel port expander with a 400 kHz fast I2C bus.
- 5-V tolerant I/O ports.
- Open-drain active-low interrupt output.
- Three hardware address pins allowing up to eight devices on the same I2C/SMBus.
- Latched outputs with high-current drive capability for directly driving LEDs.
- Internal power-on reset and noise filter on SCL/SDA inputs.
- ESD protection exceeding JESD 22 standards.
- Pin-to-pin and I2C address compatible with the PCF8574, but requires software changes due to enhancements.
Applications
The PCA9534PW is suitable for a wide range of applications requiring I/O expansion, including:
- Industrial control systems.
- Consumer electronics.
- Automotive systems.
- Medical devices.
- Embedded systems and microcontroller projects.
Q & A
- What is the operating voltage range of the PCA9534PW?
The PCA9534PW operates within a power-supply voltage range of 2.3 V to 5.5 V.
- How many I/Os does the PCA9534PW provide?
The PCA9534PW provides 8 bits of general-purpose parallel I/O.
- What is the maximum I2C bus frequency supported by the PCA9534PW?
The PCA9534PW supports a maximum I2C bus frequency of 400 kHz.
- What is the standby current consumption of the PCA9534PW?
The standby current consumption of the PCA9534PW is 1 μA Max.
- Does the PCA9534PW have ESD protection?
- Can the PCA9534PW drive LEDs directly?
- How many devices can be connected on the same I2C/SMBus using the PCA9534PW?
- What is the package type of the PCA9534PW?
- Is the PCA9534PW RoHS compliant?
- Can the PCA9534PW be used with 5V systems?
