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.

LP8733-Q1: How can customer to configure the chip before they weld the chip on their board?

Part Number: LP8733-Q1
Other Parts Discussed in Thread: LP87330Q1EVM

Dears:

There are other issues about it:

1. Is there any default configuration when customer gets the parts? Or is the chip naked? Since customer want to configure the chip with own requirement before power on.

2. I see customer don't use MCU to configure LP8733-Q1 and directily power out to support CPU. Is it OK?

3. How can customer to configure the chip before they weld the chip on their board?

  • Lian,

    The LP8733-Q1 by default does not have any sequencing, and all of the voltage rails are disabled. It is designed to be configured by an external device such as an MCU (or other devices capable of I2C communication) every time it is powered on, allowing the customer to set sequencing, voltages, and other settings to fit their design. However, these settings cannot be programmed before soldering the chip on the board because it resets every time the device loses power.

    There are other LP8733-Q1 devices with pre-programmed settings in OTP memory, but to get a new pre-programmed device requires a business case review, and has a bit more lead time. If you would like a custom program you should contact your local TI Sales Representative.
  • Hi Nick:
    Could customer use EVM's IIC(LP87330Q1EVM) to configure LP8733-q1(OTP) firstly and weld their boards secondly?
  • Luck,

    The device can't be configured before soldering it onto their board, because the device will reset to its original settings when it loses power.

    The device has one time programmable (OTP) memory which is programmed at the factory, and can't be changed. When you change the voltages and sequencing through I2C writes this is only changing the volatile memory, which will effect the device outputs, but will not be saved once the device loses power. When the device powers up it will load the settings from OTP memory into the volatile registers, undoing any of the changes that were previously made.

    Typically the device works this way so that the we can make a custom program for each customer (dependent on business case) that will be programmed into the OTP memory at the factory, but this specific program is designed to not do anything on startup, so the settings can be changed after the device is powered on.