Overview
The PCA9551PW,118 is an 8-bit I²C-bus LED driver with programmable blink rates, manufactured by NXP USA Inc. This component is designed to control LEDs in I²C-bus and SMBus applications, helping to limit bus traffic and free up the I²C-bus controller. It features a simple and efficient way to manage LED blinking without heavily loading the system's microcontroller.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD supply voltage | 2.3 | 5.5 | V | ||
| LOW-level output current (VOL = 0.4 V) | VDD = 2.3 V | 6 | 9 | mA | |
| LOW-level output current (VOL = 0.4 V) | VDD = 3.0 V | 8 | 11 | mA | |
| LOW-level output current (VOL = 0.4 V) | VDD = 5.0 V | 10 | 14 | mA | |
| Input leakage current | VDD = 3.6 V; VI = 0 V or VDD −1 | -1 | +1 | µA | |
| Input/output capacitance | 2.1 | 5 | pF | ||
| LOW-level input voltage | A0, A1, A2; RESET | -0.5 | +0.8 | V | |
| HIGH-level input voltage | A0; RESET | 2.0 | 5.5 | V | |
| HIGH-level input voltage | A1; A2 | 2.0 | VDD + 0.5 | V | |
| Output current on pin LEDn | -25 | +25 | mA | ||
| Ground supply current | 100 | mA | |||
| Total power dissipation | 400 | mW | |||
| Storage temperature | -65 | +150 | °C | ||
| Ambient temperature operating | -40 | +85 | °C | ||
| Package | TSSOP-16 |
Key Features
- 8-bit I²C-bus LED driver: Controls up to 8 LEDs with programmable on, off, and flashing states.
- Programmable blink rates: Two selectable, fully programmable blink rates (frequency and duty cycle) between 0.148 Hz and 38 Hz.
- PWM Dimming: Pulse Width Modulation (PWM) control for each channel, allowing for adjustable duty cycles.
- General Purpose I/O: Any unused bits can be used for General Purpose parallel Input/Output (GPIO) expansion.
- Hardware Reset and Power-On Reset: Active LOW hardware reset pin and Power-On Reset (POR) to initialize registers to their default state.
- Addressing Capability: Three hardware address pins allow up to eight devices to operate on the same bus, with 126 possible address combinations.
Applications
- I²C-bus and SMBus Systems: Ideal for applications where it is necessary to limit bus traffic or free up the I²C-bus controller.
- LED Indicators and Displays: Suitable for controlling LED indicators, status lights, and display panels in various electronic devices.
- Automotive and Industrial Systems: Can be used in automotive and industrial environments where robust and reliable LED control is required.
- Consumer Electronics: Applicable in consumer electronics such as appliances, gadgets, and other devices requiring LED control.
Q & A
- What is the PCA9551PW,118 used for?
The PCA9551PW,118 is an 8-bit I²C-bus LED driver used to control LEDs in I²C-bus and SMBus applications, helping to limit bus traffic and free up the I²C-bus controller.
- What is the maximum output sink current per bit?
The maximum output sink current per bit is 25 mA.
- What is the total power dissipation of the PCA9551PW,118?
The total power dissipation is 400 mW.
- What is the operating temperature range of the PCA9551PW,118?
The operating temperature range is from -40°C to +85°C.
- How many devices can operate on the same bus using the PCA9551PW,118?
Up to eight devices can operate on the same bus, with 126 possible address combinations.
- What is the package type of the PCA9551PW,118?
The package type is TSSOP-16.
- Can the PCA9551PW,118 be used for GPIO expansion?
- How does the PCA9551PW,118 handle reset conditions?
- What are the programmable blink rates of the PCA9551PW,118?
- Can the PCA9551PW,118 be used in automotive applications?
