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power up sequence for DM8148 using TPS659113

Hi,

We are using DM8148CCYE2 with TPS659113 in our board with other ASICs , FPGA.

I have few very queries regarding power up sequence of TPS659113.

I referred DM8148  EVM. In that power up sequence is such that 1.8V,3.3V,1.5V(DDR), 1.35V

1.According to EVM Hardware user guide to achieve the power-up sequencing of 1.8V,1.5V (DDR),3.3V,1.35V (mentioned in datasheet)
When using TPS659113
GPIO 0 should be connected to 3.3V power supply enable
GPIO 7should be connected to DDR power supply enable (GPIO 7 will come up first according to the sequence mentioned in hardware user guide , and DDR rail should be connected to it.But in EVM GPIO 0 is connected to DDR power supply enable and GPIO 7 is connected to 3.3V power supply enable).
Which one is correct . Please confirm

2.Core voltage required for my processor is 1.35V. Whereas in EVM its 1.2V. How to change the configuration in EEPROM. Is it possible to program EEPROM foe new configuration

  • Hi,

    Related to my previous post question 1: In the TPS659113 Centaurus User Guide (Figure 2. Example Power Solution With TPS659113 ) its given that GPIO 7 should be connected to DDR regulator and GPIO 0 should be connected to 3V3 regulator which is correct according to the sequence mentioned in DM8148 datasheet(DDR_1V5 should come up first followed by 3V3). But in MISTRAL EVM GPIO 0 is connected to DDR_1V5 regulator and GPIO 7 is connected to 3V3.
    Which is the correct one and should be followed?

    Regards
    Madhura
  • Hi,

    Well, I suppose that, for the first question, Mistral connects GPIO 0 to the DDR3 regulator's enable pin and GPIO 7 to the 3.3V regulator's enable pin because they use TPS6591133 instead of TPS659113, if you have a look at the the user guide, you'll see on page 4 this difference: www.ti.com/lit/ug/swcu083a/swcu083a.pdf.

    For the second question, you should use the I2C interface for setting the voltage level you want on the output. The dev kit uses this processor MSP430F2132IPWR for performing that, which has a JTAG interface for programming.

    I hope that might help you.