PCA9901UK: One wire single LED driver
The PCA9901 is a 20 mA current source for a single LED that allows stand-alone blinking of a predefined pattern to off-load the microcontroller and save battery power.
Programming of the device is done through a training sequence: the host controller sends the LED lighting sequence and the PCA9901 memorizes it. Once the sequence has been memorized, the PCA9901 can be programmed to send it once or in a loop until the host controller requests the sequence to be stopped.
Commands and blinking sequence are sent through a uni-directional one-wire interface. Commands include: Training Start, Training End, Execute Sequence (once or in loop until a Stop Command is requested) and Reset. A blinking sequence includes up to 3 different blinking patterns, each defined by its ON and OFF timings.
A bypass mode allows the training sequence to be ignored and the LED output to follow the one-wire interface Logic state to directly control the LED from the microcontroller.
An external resistor sets the maximum current that flows in the LED, which can be set between 1 mA and 20 mA.
The PCA9901 operates from a 2.7 V to 5.5 V power supply.
Data Sheets (1)
| Name/Description | Modified Date |
|---|---|
| One wire single LED driver (REV 2.0) PDF (443.0 kB) PCA9901 | 02 Sep 2010 |
Users Guides (3)
| Name/Description | Modified Date |
|---|---|
| I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM10204 | 28 Apr 2014 |
| I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA | 03 Apr 2013 |
| I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM10206 | 13 Jun 2006 |
Brochures (1)
| Name/Description | Modified Date |
|---|---|
| NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 75017540 | 01 Aug 2014 |
Selector Guides (1)
| Name/Description | Modified Date |
|---|---|
| Application guide; Portable devices and mobile handsets (REV 2.0) PDF (15.4 MB) 75017090 | 13 Mar 2012 |
Ordering Information
| Product | Status | Package version | Application | Enable | Operating Temperature (Cel) | PWMs | I2C-bus interface | Reset input pin | I2C-bus (kHz) | Operating voltage (VDC) | Max Sink Current per bit (mA) | No of Addresses | Max Sink Current, per package (mA) | Number of bits |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9901UK | End of Life | NAU000 |
Package Information
| Product ID | Package Description | Outline Version | Reflow/Wave Soldering | Packing | Product Status | Part NumberOrdering code(12NC) | Marking | Chemical Content | RoHS / Pb Free / RHF | LeadFree Conversion Date | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9901UK |  | Reel 7" Q1/T1 in Drypack | Discontinued | PCA9901UK,027 (9352 841 31027) | Standard Marking | PCA9901UK |    | Always Pb-free | NA | NA |
