Overview
The PCA9551D,118 is an 8-bit I²C-bus LED driver with programmable blink rates, manufactured by NXP USA Inc. This device is designed to blink LEDs in I²C-bus and SMBus applications, helping to limit bus traffic or free up the I²C-bus controller. It features an internal oscillator that eliminates the need for external components and supports two fully programmable blink rates.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SO16 (plastic small outline package, 16 leads) |
| Operating Voltage | 2.3 V to 5.5 V |
| Output Sink Current per Bit | 25 mA |
| Output Sink Current per Package | 100 mA |
| Clock Frequency | 0 Hz to 400 kHz |
| Address Pins | 3 (allowing 8 devices on the same bus) |
| Reset Type | Active LOW hardware reset, Power-On Reset (POR) |
| ESD Protection | Exceeds 2000 V HBM, 150 V MM, 1000 V CDM |
| Operating Temperature | -40 °C to +85 °C |
Key Features
- 8 LED drivers with programmable on, off, and flashing states
- Two selectable, fully programmable blink rates (frequency and duty cycle) between 0.148 Hz and 38 Hz
- Internal oscillator requiring no external components
- I²C-bus interface logic compatible with SMBus
- Input/outputs not used as LED drivers can be used as regular GPIOs
- 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 PCA9551D,118 is suitable for various applications where LED control and I²C-bus communication are required. These include:
- Automotive lighting systems
- Industrial control panels
- Consumer electronics with LED indicators
- Medical devices requiring LED status indicators
- Any system needing to manage LED status via I²C-bus
Q & A
- What is the PCA9551D,118 used for?
The PCA9551D,118 is an 8-bit I²C-bus LED driver used to control LEDs in I²C-bus and SMBus applications. - What are the programmable blink rates of the PCA9551D,118?
The device supports two fully programmable blink rates between 0.148 Hz and 38 Hz. - What is the maximum output sink current per bit?
The maximum output sink current per bit is 25 mA. - What is the operating voltage range of the PCA9551D,118?
The operating voltage range is from 2.3 V to 5.5 V. - Does the PCA9551D,118 have ESD protection?
Yes, it exceeds 2000 V HBM, 150 V MM, and 1000 V CDM. - Can unused I/Os be used as GPIOs?
Yes, input/outputs not used as LED drivers can be used as regular GPIOs. - What is the clock frequency range of the I²C-bus interface?
The clock frequency range is from 0 Hz to 400 kHz. - How many devices can operate on the same bus?
Up to 8 devices can operate on the same bus due to the three hardware address pins. - What is the operating temperature range of the PCA9551D,118?
The operating temperature range is from -40 °C to +85 °C. - Does the PCA9551D,118 support hot insertion?
Yes, it supports hot insertion.
