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  • LP55231: Not able to read and write the program memory of SRAM of LP55231

    TI Thinks Resolved
    Part Number: LP55231 Other Parts Discussed in Thread: LP5813 Tool/software: I have using the Raspberrypi 3 B+ with LP55231 via i2c, i able to write the register to glow the LED connected to D7 and D9 using python and attaching the python code. So, the…

  • LP55231: Ratiometric

    TI Thinks Resolved
    Part Number: LP55231 Other Parts Discussed in Thread: LP5569 Hello, I am using 2 chips with independent programs and both synced with Trigger line and using the same Clock. I have a problem when using the Ratiometric configuration inside the Engines…

  • LP55231: LP55231's all led dimming using SRAM(use engines)

    TI Thinks Resolved
    Part Number: LP55231 Other Parts Discussed in Thread: LP5813 Hello I am luis I have a question about LP55231 1) Is it possible to program all 9 LEDs to have individual dimming timing using SRAM? Please provide example code if you have it. 2) Some leds…

  • LP55231: LP55231

    Part Number: LP55231 I want to use LP55231 to drive 12VDC RGB LED Strip with common anode. I need circuit design using LP55231 to drive 12VDC RGB LED strip using MOSFET Can you send reference design for this?

  • LP55231: Limits of the external (32kHz) clock frequency range.

    Part Number: LP55231 Is it the case, that by toggling the external 32kHz 'CLK' pin on the LP55231 RGB LED driver at a higher rate that 32kHz, the PWM frequency will be increased proportionally? Assuming that this is the case, and if we accept…
    • Answered

  • LP55231: Questions about LP55231

    Resolved
    Part Number: LP55231 Hello, I would like to ask you a question about the LP55231. (Question 1) If the charge pump circuit is always used in bypass (1×) mode, Are external capacitors C1 and C2 unnecessary? (Question 2) Regarding PWM control, the data…
    • Resolved

  • LP55231: This chip NACKs the very first transaction after the powerup

    TI Thinks Resolved
    Part Number: LP55231 Hello, LP55231 chip on our board does not reply to the very first I2C access after the powerup. Our initialization sequence is as follows: Turn on the power Pull EN pin high Delay 500uS Write 0x0040 (CHIP_EN high) to register 0 …
    • Answered

  • LP55231: alternative

    Resolved
    Part Number: LP55231 Hi Team, is there an alternative/newer solution to LP55231 which meets below key-careabouts? - I2C interface - LEDs are sourced (can’t use LED sink for this particular design) - Embedded LED test (short/open and voltage measurement…
    • Resolved
    • Answered

  • LP55231: Reset processing at startup

    Resolved
    Part Number: LP55231 Hello, I have a question regarding the LP55231 power-up reset process. Which one writes FF to the reset register (3Dh) when the EN pin is in "L" state or when the EN pin is in "H" state? Please let me know your opinion…
    • Resolved
    • Answered

  • LP55231: Handling of EN in RESET processing

    Resolved
    Part Number: LP55231 Hello, I would like to ask you a question about the LP55231. (Question 1) When writing 0xFF to the reset register, does ACK of I2C communication return? (Question 2) After writing 0xFF to the reset register, is it necessary to wait until…
    • Resolved

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