LP8501 datasheet(20/51 Pages) TI1

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LP8501

SNVS548D – SEPTEMBER 2008 – REVISED AUGUST 2013

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Write 03h (0000 0011b) to register 5Fh (select LED output 3for engine 2LSB, output selection part).

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Write 40h (0100 0000b) to register 60h (set PWM value to full FFh MSB, instruction part).

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Write FFh (1111 1111b) to register 61h (set PWM value to full FFh LSB, PWM value part).

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Write 7Eh (0111 1110b) to register 62h (wait for 0.48s (maximum) MSB, instruction part).

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Write 00h (0000 0000b) to register 63h (wait for 0.48s LSB).

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Write 40h (0100 0000b) to register 64h (set PWM value to zero MSB, instruction part).

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Write 00h (0000 0000b) to register 65h (set PWM value to zero LSB, PWM value part).

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Write 7Eh (0111 1110b) to register 66h (wait for 0.48s MSB, instruction part).

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Write 00h (0000 0000b) to register 67h (wait for 0.48s LSB).

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Write A2h (1010 0010b) to register 68h (branch instruction with loop count 4 MSB, instruction part).

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Write 01h (0000 0001b) to register 69h (branch instruction with loop count 4 LSB sets program counter

value to '1', i.e., program continues execution in this case from setting PWM value).

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Write C0h (1100 0000b) to register 6Ah (end instruction MSB, instruction part).

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Write 00h (0000 0000b) to register 6Bh (end instruction LSB).

Set start address

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Write 00h (0000 0000b) to register 4Ch (set engine 1 start address to 0).

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Write 07h (0000 0111b) to register 4Dh (set engine 2 start address to 7, 7th 16–bit write, 15th I2C write).

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Optional: Write 00h (0000 0000b) to register 37h (set program counter of engine 1 to 0).

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Optional: Write 00h (0000 0000b) to register 38h (set program counter of engine 2 to 0).

Enable powersave, set charge pump to auto mode and select external clock:

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Write 38h (0011 1000b) to register 36h.

Run program:

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Write 28h (0010 1000b) to register 01h (set engines 1 and 2 to Run mode).

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Write 68h (0110 1000b) to register 00h (set program execution from Hold to Run and keep device

enabled).

LP8501 will now generate five 0.48 second long blinks to LED outputs 1 and 3.

3. Group Fader ControlStart up the device:

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Supply, e.g., 3.6V to VDD.

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Supply, e.g., 1.8V to EN.

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Write 40h (0100 0000b) to address 00h (enable the device).

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Wait 500 µs (startup delay).

Check LED powering

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Suppose LED outputs from 1 to 9 are connected to VOUT.

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Write 03h (0000 0011b) to address 05h (VDD1_6 and VDD7_9 powered from VOUT.

Enable charge pump 1.5x mode and use internal clock:

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Write 11h (0001 0001b) to register 36h.

Select LED outputs 1, 3 and 7 to Fader Group 1:

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Write 40h (0100 0000b) to address 06h (LED output 1 to group 1).

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Write 40h (0100 0000b) to address 08h (LED output 3 to group 1).

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Write 40h (0100 0000b) to address 0Ch (LED output 7 to group 1).

Set group 1 fader times:

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Write CFh (1100 1111b) to register 02h (group 1 Fade IN time to 1.5 s and Fade OUT time to 4s).

Set group PWM value:

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Write FFh (1111 1111b) to register 48h (group 1 PWM duty cycle to 100%, all three LED outputs fades

on in 1.5s)

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