pca9901 NXP Semiconductors, pca9901 Datasheet - Page 9

• Manufacturer Part Number: pca9901
• Description: One Wire Single Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9901_1
Product data sheet
Fig 8.
Fig 9.
TRAINING START and TRAINING END commands
RUN ONCE, RUN, STOP and RESET commands
PCA9901 leaves
1.5 ms minimum
1.5 ms minimum
Shutdown mode
RUN command
RUN ONCE command
and is ready for capture within 1.5 ms (max).
8.5 TRAINING START and TRAINING END commands waveforms
8.6 RUN ONCE, RUN, STOP and RESET commands waveforms
8.7 Bypass mode
PCA9901 leaves Shutdown mode
All registers are set to zeroes.
TRAINING START command
A Bypass mode allows the PCA9901 LEDOUT pin to be directly driven by the CTRL logic
state.
A TRAINING START command followed immediately by a TRAINING END command
enters the Bypass mode. Once the TRAINING END command has been issued, the
LEDOUT output follows the CTRL logic state (LED ON when CTRL = HIGH, LED OFF
when CTRL = 0). Sending a RESET command exits the Bypass mode.
The Bypass mode allows the microcontroller to directly control the LED and blink it or
dim it.
1.5 ms minimum
programmed sequence
runs in loop
programmed
sequence
runs once
Rev. 01 — 3 December 2009
first LED ON timing
last LED OFF timing
Training sequence
LED on
STOP command
LEDOUT = OFF
PCA9901 goes to Shutdown mode
PCA9901 goes to Shutdown mode immediately
if LED is OFF (counting LED OFF time).
or
PCA9901 goes to Shutdown mode
once the current LED ON time
has been performed.
PCA9901 goes to Shutdown mode
RESET command
1.5 ms minimum
PCA9901 leaves
Shutdown mode
TRAINING END command
1.5 ms minimum
One wire single LED driver
All registers set to zeroes;
PCA9901 goes to
Shutdown mode.
PCA9901
© NXP B.V. 2009. All rights reserved.
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