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Product Detailed Parameters
- Description：IC LED DRVR PS PWM 25MA 16HVQFN
- Series：-
- Mfr：NXP USA Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Power Switch
- Topology：-
- Internal Switch(s)：Yes
- Number of Outputs：8
- Voltage - Supply (Min)：2.3V
- Voltage - Supply (Max)：5.5V
- Voltage - Output：-
- Current - Output / Channel：25mA
- Frequency：-
- Dimming：PWM
- Applications：-
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：16-VQFN Exposed Pad
- Supplier Device Package：16-HVQFN (4x4)
- Grade：-
- Qualification：-
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Overview
The PCA9551BS,118 is an 8-bit I²C-bus LED driver manufactured by NXP Semiconductors. It provides programmable blink rates for LEDs and operates within a 2.3 V to 5.5 V supply voltage range. The device features five address pins allowing up to 32 units on one bus. It includes internal power-on reset and noise filters on SCL/SDA inputs. The component supports 400 kHz clock frequency and offers ESD protection exceeding 2000 V HBM. It is housed in a 16-pin HVQFN package.
Feature Summary
- Programmable blink rates for LED control
- I²C-bus interface with multiple address configurations
- Internal power-on reset and noise filtering
Applications
- LED indicator control systems
- Embedded display backlight management
- Consumer electronics status indication
Procurement Notes
Verify the specific ordering code suffix, such as ,118 or ,128, against the manufacturer's current product selection guide. Confirm that the HVQFN16 package variant matches the required footprint for the PCB design. Check the latest environmental compliance certificates, including RoHS and REACH status, to ensure adherence to regional regulatory standards before finalizing procurement orders.
Selection Notes
Select this component when dedicated hardware-based LED blinking functionality is required without continuous microcontroller intervention. Ensure the system voltage aligns with the 2.3 V to 5.5 V operating range. Consider the available address combinations if multiple drivers are needed on the same I²C bus. Verify that the HVQFN16 package size fits within the spatial constraints of the target application design.
Part Context
The PCA9551 series belongs to NXP's family of I²C-bus peripheral controllers designed for simple peripheral expansion. Unlike general-purpose GPIO expanders, this specific model focuses on LED driving capabilities with built-in timing functions. It complements other I²C devices by offloading repetitive blinking tasks from the main processor, thereby reducing CPU load in embedded systems.
FAQ
How many PCA9551BS devices can be connected to a single I²C bus?
Up to 32 devices can be connected to a single I²C bus due to the availability of five address pins.
What is the function of the internal power-on reset in this component?
The internal power-on reset ensures that the registers are initialized to their default values upon power-up, preventing undefined states.
