pca9901 NXP Semiconductors, pca9901 Datasheet - Page 8

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

NXP Semiconductors
PCA9901_1
Product data sheet
Fig 7.
1_ON, 2_ON and 3_ON timings: between 1 ms and at least 255 ms (4096 steps).
2_OFF, 2_OFF and 3_OFF timings: between at least 20 ms and 5.1 s (4096 steps).
Lighting sequence capture
TRAINING
START
8.4 Lighting training sequence
LED ON
1_ON
Training sequence starts after a TRAINING START command has been issued by the
host controller and ends after a TRAINING END command has been issued.
The LED ON timing is provided when CTRL is HIGH and the LED OFF timing is provided
when CTRL is LOW.
LEDOUT follows CTRL Logic state during the Training sequence: The LED is ON when
CTRL = HIGH, and the LED is OFF when CTRL = LOW.
The sequence is as follows:
Pattern 1 ON – Pattern 1 OFF – Pattern 2 ON – Pattern 2 OFF – Pattern 3 ON –
Pattern 3 OFF
A sequence composed by only 1 or 2 patterns can also be stored by issuing the
TRAINING END command after either the 1
registers during the training sequence remain programmed with zeroes; when the state
machine encounters a Zero ON time register, it loops to the beginning of the sequence.
ON and OFF timings are stored on the 8-bit registers. The registers are reset to zeroes
when the host controller sends a TRAINING START or RESET command.
•
•
LED ON timing: 1 ms step with a 12-bit resolution – Time between 1 ms and at least
255 ms.
An ON time higher than 255 ms causes the ON counter to saturate at max value
(0xFF).
LED OFF timing: 20 ms step with a 12-bit resolution – Time between at least 20 ms
and 5.1 s.
An OFF time higher than 5.1 s causes the OFF counter to saturate at max value
(0xFF).
Pattern 1
LED OFF
1_OFF
LEDOUT pin follows CTRL state dring the sequence capture
Rev. 01 — 3 December 2009
LED ON
2_ON
sequence
Pattern 2
LED OFF
2_OFF
st
or the 2
LED ON
3_ON
nd
Pattern 3
pattern. Non-programmed
LED OFF
3_OFF
One wire single LED driver
TRAINING
PCA9901
© NXP B.V. 2009. All rights reserved.
END
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