Design Files
Receive the full breakdown. See the product footprint and more in the eCad file.
- No Longer Manufactured
- PCA9901
One-Wire Single LED Driver
- This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.
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.
Product Details
Features
System Features
- 1 wire interface to control the device
- Stand-alone blinking capability while training the sequence to blink
- Sequence includes up to 3 blinking elements
- 12-bit (4096 steps) LED ON and OFF timings for each blinking element:
- ON timing is captured between 1 ms and 255 ms
- OFF timing is captured between 20 ms and 5.1 s
- 1.8 V compliant one-wire logic interface
- Training Start, Training End, Run-Once, Run, Stop and Reset commands
- High side current controlled LED driver with 1 mA to 20 mA max current in the LED set by an external resistor. 5 mA drive capability when no external resistor is connected
- 110 mV max dropout voltage driver at 20 mA
- Fully internal oscillator for sequence training, LED timing, Command and Sequencing Controls
- Short circuit and thermal protection
- 2.7 V to 5.5 V power supply
- Very low quiescent current: < 0.75 μA
- ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101
- Latch-up testing is done to JEDEC Standard JESD78, which exceeds 100 mA
- Temperature range: –40 ℃ to +85 ℃
- Packages offered: TSSOP8, WLCSP6
Part numbers include: PCA9901DP, PCA9901UK.
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