Overview
The Texas Instruments PCA9557RGVR is an 8-bit I2C and SMBus low-power I/O expander designed for a wide range of applications requiring remote I/O expansion. This device operates within a voltage range of 2.3V to 5.5V and is packaged in a 16-pin VQFN (RGV) package. It is suitable for use in various microcontroller-based systems, providing a flexible and efficient way to expand the I/O capabilities of the system.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | PCA9557RGVR |
| Package Type | 16-VQFN (RGV) |
| Number of Pins | 16 |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Range | 2.3V to 5.5V |
| I2C/SMBus Frequency | 400kHz |
| Number of I/Os | 8 |
| Standby Current Consumption | 1µA maximum |
| ESD Protection | 2000V Human-body model, 200V Machine model, 1000V Charged-device model |
Key Features
- Low standby current consumption of 1µA maximum
- I2C to parallel port expander
- Operating power-supply voltage range of 2.3V to 5.5V
- 5V Tolerant I/O ports
- 400kHz Fast I2C bus
- Three hardware address pins allowing up to eight devices on I2C/SMBus
- Lower-voltage higher-performance migration path for PCA9556
- Input and output configuration register
- Polarity inversion register
- Active-low reset input and internal power-on reset
- High-impedance open drain on P0
- Power up with all channels configured as inputs
- No glitch on power up
- Noise filter on SCL or SDA inputs
- Latched outputs with high current drive capability for directly driving LEDs
- Latch-up performance exceeds 100mA per JESD 78, class II
Applications
The PCA9557RGVR is versatile and can be used in a variety of applications, including:
- Industrial control systems
- Consumer electronics
- Automotive systems
- Medical devices
- Any system requiring remote I/O expansion through I2C or SMBus interfaces
Q & A
- What is the PCA9557RGVR?
The PCA9557RGVR is an 8-bit I2C and SMBus low-power I/O expander produced by Texas Instruments.
- What is the operating voltage range of the PCA9557RGVR?
The device operates within a voltage range of 2.3V to 5.5V.
- What is the package type of the PCA9557RGVR?
The device is packaged in a 16-pin VQFN (RGV) package.
- What is the maximum I2C/SMBus frequency supported by the PCA9557RGVR?
The device supports a maximum I2C/SMBus frequency of 400kHz.
- How many devices can share the same I2C bus or SMBus using the PCA9557RGVR?
Up to eight devices can share the same I2C bus or SMBus using the three hardware address pins.
- What is the standby current consumption of the PCA9557RGVR?
The standby current consumption is 1µA maximum.
- Does the PCA9557RGVR have ESD protection?
Yes, the device has ESD protection exceeding 2000V Human-body model, 200V Machine model, and 1000V Charged-device model.
- Can the PCA9557RGVR drive LEDs directly?
Yes, the device has latched outputs with high current drive capability for directly driving LEDs.
- How does the PCA9557RGVR handle power-on reset?
The power-on reset puts the registers in their default state and initializes the I2C/SMBus state machine.
- Can the PCA9557RGVR be reset without depowering the part?
Yes, asserting the RESET pin causes the same reset/initialization to occur without depowering the part.
