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SNVS441F – JANUARY 2007 – REVISED FEBRUAY 2013
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Write
Write
Write
Write
Write
to
to
to
to
to
address
address
address
address
address
13H
14H
15H
16H
17H
0000
0000
1111
0110
0000
0000b
0011b
1111b
0000b
0000b
(1st wait command 8 LSB)
(2nd ramp command 8 MSB)
(2nd ramp command 8 LSB)
(2nd wait command 8 MSB)
(2nd wait command 8 LSB)
Enable Powersave, charge pump automatic mode (1x / 1.5x) and use external 32 kHz clock:
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Write to address 08H 0011 1000b
Run program:
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Write to address 01H 0010 0000b (Configure LED controller operation mode to "Run program" in R channel
Write to address 00H 0110 0000b (Configure program execution mode from "Hold" to "Run" in R channel
LP5521 will generate 1100 ms long LED pattern which will be repeated infinitely. LED pattern is illustrated on the
figure below.
PWM value
255
127
R
Time (ms)
100
200
300
400
500
600
700
800
900 1000 1100
1200 1300 1400
1500 1600 1700
R program:
ramp up to PWM value 128 in 200 ms
wait 200 ms
ramp down to PWM value 0 in 200 ms
wait 500 ms
R program as binary code:
0000001101111111
0100110100000000
0000001111111111
0110000000000000
Figure 34. Sequence diagram
DIRECT PWM CONTROL EXAMPLE
Startup device:
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Supply e.g. 3.6V to VDD
Supply e.g. 1.8V to EN
Wait 1 ms (startup delay)
Write to address 00H 0100 0000b (enable LP5521)
Wait 500 μs (startup delay)
Enable charge pump 1.5x mode and use internal clock:
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Write to address 08H 0001 0001b
Direct PWM control:
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Write to address 01H 0011 1111b (Configure R, G and B channels into "Direct PWM control mode")
Write PWM values:
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Write to address 02H 1000 0000b (R driver PWM 50% duty cycle)
Write to address 03H 1100 0000b (G driver PWM 75% duty cycle)
Write to address 04H 1111 1111b (B driver PWM 100% duty cycle)
LEDs are turned on after the PWM values are written. Changes to the PWM value registers are reflected
immediately to the LED brightness. Default LED current (17.5 mA) is used for LED outputs, if no other values are
written.
See application note "LP5521 Programming Considerations" for more information.
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Product Folder Links: LP5521
Copyright ? 2007–2013, Texas Instruments Incorporated
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