AT25DF021A datasheet(39/59 Pages) RENESAS

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DS-AT25DF021A-042 Rev. J

Page 39

12/22/22

AT25DF021A Datasheet

12.3 Resume from Deep Power-Down

In order to exit the Deep Power-Down mode and resume normal device operation, the Resume from Deep Power-

Down command must be issued. The Resume from Deep Power-Down command is the only command that the

device recognize while in the Deep Power-Down mode.

To resume from the Deep Power-Down mode, the CS pin must first be asserted and opcode of ABh must be

clocked into the device. Any additional data clocked into the device after the opcode are ignored. When the CS pin

is deasserted, the device exits the Deep Power-Down mode within the maximum time of tRDPD and return to the

standby mode. After the device has returned to the standby mode, normal command operations such as Read

Array can be resumed.

If the complete opcode is not clocked in before the CS pin is deasserted, or if the CS pin is not deasserted on an

even byte boundary (multiples of eight bits), then the device aborts the operation and return to the Deep Power-

Down mode.

Figure 32. Resume from Deep Power-Down

SCK

MSB

ICC

10101011

OPCODE

High-Impedance

Deep Power-Down Mode Current

Active Current

Standby Mode Current

tRDPD

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