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3. Power-up Initialization

3.

Power-up Initialization

SPI/QPI products include an on-chip voltage sensor which activates the self-initialization process.

When Vcc reaches a stable level at or above the minimum Vcc, the device will need 150 μs and a

user-issued reset operation (see Section 8) to complete its self-initialization process. From the be-

ginning of power ramp to the end of the 150-μs period, CLK should remain low, CE# should re-

main high (to track Vcc within 200 mV) and SI/SO/SIO[3:0] should remain low.

After the 150-μs period, the device will be ready for normal operation.

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Figure 3-1. Power-up Initialization Timing

Espressif Systems

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