AT45DB021E datasheet(38/74 Pages) DIALOG

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AT45DB021E

DS-AT45DB021E—8789J—03/2021

11.3 Exit Ultra-Deep Power-Down

To exit from the Ultra-Deep Power-Down mode, the CS pin must be pulsed by asserting the CS pin, waiting the

minimum necessary tCSLU time, and then deasserting the CS pin again. To facilitate simple software development,

a dummy byte opcode can also be entered while the CS pin is being pulsed; the dummy byte opcode is ignored by

the device in this case. After the CS pin has been deasserted, the device exits from the Ultra-Deep Power-Down

mode and returns to the standby mode within a maximum time of tXUDPD. If the CS pin is reasserted before the

tXUDPD time has elapsed in an attempt to start a new operation, then that operation is ignored and nothing is

performed. The system must wait for the device to return to the standby mode before normal command operations

such as Continuous Array Read can be resumed.

Since the contents of the Buffer cannot be maintained while in the Ultra-Deep Power-Down mode, the Buffer

contains undefined data when the device returns to the standby mode.

Figure 11-4. Exit Ultra-Deep Power-Down Timing

ICC

High-impedance

Ultra-Deep Power-Down Mode Current

Active Current

Standby Mode Current

tXUDPD

tCSLU

AT45DB021E Datasheet(PDF) 38 Page - Dialog Semiconductor