Overview
The PCA9551BSHP, produced by NXP USA Inc., is an 8-bit I2C-bus LED driver with programmable blink rates. This device is designed to manage LED blinking in I2C-bus and SMBus applications, reducing the need for repeated commands from the bus master and thus minimizing bus traffic. The PCA9551 features an internal oscillator that allows for two fully programmable blink rates, making it a versatile component for various lighting control applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | HVQFN16 |
| Operating Voltage Range | 2.3 V to 5.5 V |
| Maximum Output Sink Current per Bit | 25 mA |
| Maximum Output Sink Current per Package | 100 mA |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | 2000 V HBM, 150 V MM, 1000 V CDM |
| Address Pins | 3 (allowing 8 devices on the same bus) |
| Blink Rate Range | 0.148 Hz to 38 Hz (6.74 seconds to 0.026 seconds) |
| Reset Pin | Active LOW hardware reset |
| Power-On Reset | Yes |
Key Features
- 8-bit I2C-bus LED driver with programmable blink rates
- Internal oscillator requiring no external components
- Two fully programmable blink rates (frequency and duty cycle)
- Input/outputs not used as LED drivers can be used as regular GPIOs
- I2C-bus interface logic compatible with SMBus
- No glitch on power-up and supports hot insertion
- Low standby current
- Edge rate control on outputs
- Noise filter on SCL/SDA inputs
Applications
The PCA9551BSHP is suitable for a variety of applications where LED blinking and control are necessary, such as:
- Automotive lighting systems
- Industrial control panels
- Consumer electronics with LED indicators
- Medical devices requiring LED status indicators
- Any system requiring I2C-bus or SMBus compatible LED control
Q & A
- What is the PCA9551BSHP used for? The PCA9551BSHP is an 8-bit I2C-bus LED driver used to control and blink LEDs in various applications, reducing the need for repeated commands from the bus master.
- What are the programmable blink rates of the PCA9551BSHP? The PCA9551BSHP has two fully programmable blink rates ranging from 0.148 Hz to 38 Hz (6.74 seconds to 0.026 seconds).
- What is the maximum output sink current per bit and per package? The maximum output sink current is 25 mA per bit and 100 mA per package.
- What is the operating voltage range of the PCA9551BSHP? The operating voltage range is from 2.3 V to 5.5 V.
- Does the PCA9551BSHP support hot insertion? Yes, the PCA9551BSHP supports hot insertion.
- What is the purpose of the internal oscillator in the PCA9551BSHP? The internal oscillator allows for programmable blink rates without requiring any external components.
- How many devices can operate on the same bus using the PCA9551BSHP? Up to 8 devices can operate on the same bus due to the 3 address pins.
- What is the clock frequency range of the PCA9551BSHP? The clock frequency range is from 0 Hz to 400 kHz.
- Does the PCA9551BSHP have ESD protection? Yes, it has ESD protection exceeding 2000 V HBM, 150 V MM, and 1000 V CDM.
- Can unused inputs/outputs be used as GPIOs? Yes, any bits not used for controlling LEDs can be used as regular GPIOs.
