AT25DF256 datasheet(27/43 Pages) DIALOG

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AT25DF256

DS-25DF256–035D–2/2017

Figure 12-5. Ultra-Deep Power-Down

12.6 Exit Ultra-Deep Power-Down

To exit from the Ultra-Deep Power-Down mode, any one of three operations can be performed:

Chip Select Toggle

The CS pin must simply 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 simply ignored by the device in this case. After the CS pin

has been deasserted, the device will exit from the Ultra-Deep Power-Down mode and return 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 will be ignored and nothing will be performed.

Figure 12-6. Exit Ultra-Deep Power-Down (Chip Select Toggle)

Chip Select Low

By asserting the CS pin, waiting the minimum necessary tXUDPD time, and then clocking in the first bit of the next Opcode

command cycle. If the first bit of the next command is clocked in before the tXUDPD time has elapsed, the device will exit

Ultra Deep Power Down, however the intended operation will be ignored.

SCK

MSB

ICC

Opcode

High-impedance

Ultra-Deep Power-Down Mode Current

Active Current

Standby Mode Current

tEUDPD

1111001

ICC

High-impedance

Ultra-Deep Power-Down Mode Current

Active Current

Standby Mode Current

tXUDPD

tCSLU

AT25DF256 数据表(PDF) 27 Page - Dialog Semiconductor