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LP5562: The LP5562 fail to turn on the LED

Eric Lai
Expert 4940 points
Part Number: LP5562

Hi Expert,

The engineer is designed the LP5562.But they reported the LED not turn on.

We collected the schematic and code setting for your confirmation.

There is 4.7Kohm pullup resistor for SCL/SDA to 1.8V into the design.

And the design is planning to use the internal CLOCK.

i2cset -y 0 0x30 0x0 0x40

i2cset -y 0 0x30 0x8 0x01

i2cset -y 0 0x30 0x1 0x3f

i2cset -y 0 0x30 0x70 0x0

i2cset -y 0 0x30 0x5 0xff

i2cset -y 0 0x30 0x6 0xff

i2cset -y 0 0x30 0x7 0xff

i2cset -y 0 0x30 0xf 0xff

 

# all off

i2cset -y 0 0x30 0x4 0x00

i2cset -y 0 0x30 0x3 0x00

i2cset -y 0 0x30 0x2 0x00

i2cset -y 0 0x30 0xe 0x00

 

# red

i2cset -y 0 0x30 0x4 0xff

i2cset -y 0 0x30 0x3 0x00

i2cset -y 0 0x30 0x2 0x00

i2cset -y 0 0x30 0xe 0x00

The LED never turn on with running this code.

Then we read the 0Ch below, then find the internal clock used is reset to external code used.   

i2cget -y 0 0x30 0xc 0x08 

It all confused us .

Pls advice.

Best regards,

Eric Lai

  

Field Application Engineer

Texas Instruments Taiwan Limited

O: +886-2-2175-2582

M: +886-909-262-582

E-Mail:Eric.Lai@ti.com            

  • +1
    TI__Expert 4160 points

    Hi Eric, 

    I have reviewed the schematic and tested the same I2C command sets on LP5562EVM. The red LED lights up properly. You can apply a EVM for our customer - unplug the SCL/SDA connection headers and port the I2C interface from customer's board - to further test it. In addition, kindly perform a diode test on the red LED dot to make sure it is not internally broken. 

    Best Regards,

    Aaron Bing