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PCA9901 Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9901 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 27 page PCA9901_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 3 December 2009 7 of 27 NXP Semiconductors PCA9901 One wire single LED driver 8.2.6 RESET command 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. 8.3 State machine 002aac605 power-up; registers reset to zeroes Shutdown mode PCA9901 up and running; registers reset to zeroes training sequence; LEDOUT follows CTRL state TRAINING START sequence memorized; LEDOUT off TRAINING END RUN RUN ONCE RESET PCA9901 up and running time-out detected during training sequence sequence sent by host controller PCA9901 up and running sequence is sent (loop) to LEDOUT(1) STOP PCA9901 up and running sequence is sent once to LEDOUT(1) TRAINING END Bypass mode when registers still at zeroes RESET LEDOUT follows CTRL state: LEDOUT = ON when CRTL = HIGH; LEDOUT = OFF when CTRL = LOW registers reset to zeroes no patterns memorized RUN or RUN ONCE (1) PCA9901 goes directly to Shutdown mode if a training sequence has not been previously performed. Fig 6. State machine of the PCA9901 |
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