• 状态 TI Thinks Resolved
  • 已锁定 已锁定
  • 回复 3 回复
  • 答案 1 答案
  • 订户 57 订户
  • 视图 151 视图
  • 用户 0 会员在此处
选项
选项
相关

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM51772: The status register 0x78 always reads as 0x40. How can I set this bit to 0?

Shawn song
Prodigy 20 points
Part Number: LM51772


I'm currently using the LM51772 and trying to configure the registers via I2C, but it fails to output a valid voltage. Could you tell me how to configure the registers and pins to achieve the target voltage output?

  • 0
    TI__Mastermind 39460 points

    Please elaborate on what you plan to do with this chip, what the schematic looks like, and what the configuration is like.

  • 0 回复 Vivian Gao
    Prodigy 20 points

    Thanks,I want to use IIC to control this chip to output different voltages. The input voltage is fixed at 12V. These are the register values I configured

    _WriteReg(0x0A,0x64);
    _WriteReg(0x0C,0x01);
    _WriteReg(0x0D,0x01);
    _WriteReg(0x21,0x00);
    _WriteReg(0x81,0x01);

    _WriteReg(0xD0,0x33);
    _WriteReg(0xD1,0x09);
    _WriteReg(0xD2,0x46);
    _WriteReg(0xD3,0x80);
    _WriteReg(0xD4,0x03);
    _WriteReg(0xD5,0x3F);
    _WriteReg(0xD6,0x95);
    _WriteReg(0xD7,0x36);
    _WriteReg(0xD8,0x80);
    _WriteReg(0xD9,0x00);

    _WriteReg(0xDA,0xFF);

    I changed the values of vout_LSB and Vout_MSB, but there was no change in vout, and the value read from the status register was 0x40.

    Which pin do I need to check on the circuit diagram

  • 0 回复 Shawn song
    TI__Mastermind 39460 points

    VOUT bit in STATUS register means that VOUT has not reached the set target voltage.

    Please connect FB pin directly (0Ohm to VCC2) to enable VOUT to be set via I2C.

    Note sure why you have enable IVP? Can you let me know what you have planned here?