PCA9901DP NXP [NXP Semiconductors], PCA9901DP Datasheet - Page 7

• Manufacturer Part Number: PCA9901DP
• Description: One wire single LED driver
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9901_1
Product data sheet
Fig 6.
LEDOUT follows
CTRL state:
(1) PCA9901 goes directly to Shutdown mode if a training sequence has not been previously performed.
LEDOUT = ON
when CRTL = HIGH;
LEDOUT = OFF
when CTRL = LOW
State machine of the PCA9901
8.2.6 RESET command
time-out detected during
8.3 State machine
training sequence
TRAINING END
A single pulse sent to the PCA9901 in less than 1.5 ms causes the PCA9901 to go to
Shutdown mode and to reset its registers to zeroes.
registers still at zeroes
PCA9901 up
Bypass mode when
and running
RESET
RESET
PCA9901 up
sequence is sent once
and running
to LEDOUT
RUN ONCE
Rev. 01 — 3 December 2009
(1)
LEDOUT follows CTRL state
PCA9901 up and running;
registers reset to zeroes
registers reset to zeroes
sequence memorized;
training sequence;
Shutdown mode
registers reset
LEDOUT off
power-up;
to zeroes
TRAINING END
TRAINING START
sequence
sent by
host
controller
sequence is sent (loop)
to LEDOUT
PCA9901 up
and running
One wire single LED driver
STOP
RUN
(1)
PCA9901
© NXP B.V. 2009. All rights reserved.
no patterns memorized
RUN or RUN ONCE
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