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ID: 5364
Case Type: faq
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Family: iCE40

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Is there a power supply sequence requirement for iCE40LP/HX Device Family?

If configuring from MSPI, Vcc and Vpp_SPI should be powered 0.25 ms before Vpp_2v5. If configuring from Slave SPI, no power supply sequencing is required. See the Power Supply Ramp Rates section of the data sheet (FPGA-DS-02029)for the required power supply ramp rates. As stated in the data sheet, the POR is monitoring VCC, VCCIO2, Vpp_2v5 and VCC_SPI. That means other supplies are not monitored. Other VCCIOs do not affect the POR. The monitored supplies ensure that the required supplies are ramped up so the device can start configuration.
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