Overview
The PCA9534APWR is an 8-bit I2C and SMBus low-power 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 voltage range of 2.3 V to 5.5 V and is known for its low standby current consumption of 1 μA maximum. The PCA9534APWR is pin-to-pin and I2C address compatible with the PCF8574A, but it requires software changes due to its enhanced features.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage Range | 2.3 | 5.5 | V | |
| Input Voltage Range | -0.5 | 6 | V | |
| Output Voltage Range | -0.5 | 6 | V | |
| Continuous Output Low Current | 50 | mA | ||
| Continuous Output High Current | -50 | mA | ||
| I2C Bus Frequency (Standard Mode) | 100 | 400 | kHz | |
| I2C Bus Frequency (Fast Mode) | 400 | 400 | kHz | |
| Storage Temperature Range | -65 | 150 | °C |
Key Features
- Low standby current consumption of 1 μA maximum.
- I2C to parallel port expander.
- Open-drain active-low interrupt output.
- 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 and output configuration registers.
- Polarity inversion register.
- Internal power-on reset.
- Power-up with all channels configured as inputs.
- No glitch on power-up.
- Noise filter on SCL and SDA inputs.
- Latched outputs with high-current drive capability for directly driving LEDs.
- ESD protection exceeds JESD 22 – 2000-V Human-body Model, 200-V Machine Model, and 1000-V Charged-device model.
Applications
The PCA9534APWR is suitable for a variety of applications where remote I/O expansion is required. These include:
- Industrial control systems.
- Automotive systems.
- Consumer electronics.
- Medical devices.
- Any system requiring I2C or SMBus communication for I/O expansion.
Q & A
- What is the operating voltage range of the PCA9534APWR?
The PCA9534APWR operates within a voltage range of 2.3 V to 5.5 V. - What is the standby current consumption of the PCA9534APWR?
The standby current consumption is 1 μA maximum. - What is the maximum frequency of the I2C bus for the PCA9534APWR?
The maximum frequency is 400 kHz for both standard and fast modes. - How many devices can be connected on the same I2C bus using the PCA9534APWR?
Up to eight devices can be connected on the same I2C bus using the three hardware address pins. When used in conjunction with the PCA9534, up to 16 devices can be connected. - What type of interrupt output does the PCA9534APWR have?
The PCA9534APWR has an open-drain active-low interrupt output. - What is the purpose of the polarity inversion register in the PCA9534APWR?
The polarity inversion register allows the polarity of the input port register to be inverted. - Does the PCA9534APWR have ESD protection?
Yes, the PCA9534APWR has ESD protection that exceeds JESD 22 – 2000-V Human-body Model, 200-V Machine Model, and 1000-V Charged-device model. - What is the maximum continuous output current for the PCA9534APWR?
The maximum continuous output low current is 50 mA, and the maximum continuous output high current is -50 mA. - Can the PCA9534APWR directly drive LEDs?
Yes, the latched outputs have high-current drive capability for directly driving LEDs. - What is the storage temperature range for the PCA9534APWR?
The storage temperature range is -65°C to 150°C.
