Overview
The PCA9534PWRG4, produced by Texas Instruments, is an 8-bit I2C and SMBus low-power I/O expander. This device is designed to provide additional general-purpose input/output (GPIO) expansion for I2C-bus/SMBus applications. It is part of the NXP Semiconductors family of I2C-bus I/O expanders and offers several enhancements over its predecessors, including higher drive capability, 5 V I/O tolerance, and lower supply current.
The PCA9534 is particularly useful in scenarios where additional I/O is needed for various components such as ACPI power switches, sensors, push buttons, LEDs, and fans. It is pin-to-pin and I2C address compatible with the PCF8574, although software changes are required due to its enhanced features.
Key Specifications
| Specification | Value |
|---|---|
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| I2C Bus Frequency | Up to 400 kHz |
| Number of GPIOs | 8 bits |
| Interrupt Output | Open-drain active-low |
| Standby Current Consumption | 1 μA Max |
| I/O Configuration | Input/Output configuration register |
| Polarity Inversion | Polarity inversion register |
| High-Level Output Current | -10 mA |
| Low-Level Output Current | 25 mA |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | TSSOP (PW) with 16 pins |
| ESD Protection | Exceeds 2000 V HBM, 200 V MM, 1000 V CDM |
Key Features
- Low standby current consumption of 1 μA Max
- I2C to Parallel port expander
- Open-drain active-low interrupt output
- Operating power-supply voltage range of 2.3 V to 5.5 V
- 5-V Tolerant I/O ports
- 400-kHz Fast I2C bus
- Three hardware address pins allow up to eight devices on the I2C/SMBus
- Allows up to 16 devices on the I2C/SMBus when used in conjunction with the PCA9534A
- Input/output configuration register
- Polarity inversion register
- Internal power-on reset
- Power-up with all channels configured as inputs
- No glitch on power up
- Noise filter on SCL/SDA inputs
- Latched outputs with high-current drive capability for directly driving LEDs
- ESD protection exceeds JESD22 standards
Applications
The PCA9534PWRG4 is versatile and can be used in a variety of applications where additional I/O expansion is required. Some common use cases include:
- ACPI power switches
- Sensors and monitoring systems
- Push buttons and user interfaces
- LED indicators and lighting systems
- Fans and other motor control systems
- Alarm systems and security devices
Q & A
- What is the PCA9534PWRG4 used for?
The PCA9534PWRG4 is an 8-bit I2C and SMBus low-power I/O expander used to provide additional GPIO expansion for various applications.
- What is the operating voltage range of the PCA9534PWRG4?
The operating power-supply voltage range is from 2.3 V to 5.5 V.
- How many devices can be connected on the same I2C/SMBus?
Up to eight devices can be connected on the same I2C/SMBus, and up to 16 devices when used in conjunction with the PCA9534A.
- What is the maximum standby current consumption?
The maximum standby current consumption is 1 μA.
- Does the PCA9534PWRG4 have ESD protection?
- What is the purpose of the interrupt output?
The open-drain active-low interrupt output is used to inform the system master of changes in the input state without needing to communicate via the I2C bus.
- Can the PCA9534PWRG4 drive LEDs directly?
- What is the clock frequency of the I2C bus?
The I2C bus operates at up to 400 kHz.
- Is the PCA9534PWRG4 compatible with other I2C devices?
- What is the operating temperature range of the PCA9534PWRG4?
- What type of package does the PCA9534PWRG4 come in?
