AT25DN011 Datasheet, PDF (26/42 Pages) List of Unclassifed Manufacturers – 1-Mbit, 2.3V Minimum SPI Serial Flash Memory with Dual-Read Support

12.4
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 will
recognized 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 will be ignored. When the CS pin is deasserted,
the device will exit the Deep Power-Down mode within the maximum time of t_RDPD 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 will abort the operation and return to the Deep Power-Down
mode.
Figure 12-4. Resume from Deep Power-Down
CS
SCK
SI
01234567
OPCODE
10101011
MSB
t_RDPD
SO
I_CC
HIGH-IMPEDANCE
Active Current
Deep Power-Down Mode Current
Standby Mode Current
12.5
Ultra-Deep Power-Down
The Ultra-Deep Power-Down mode allows the device to further reduce its energy consumption compared to the existing
standby and Deep Power-Down modes by shutting down additional internal circuitry. When the device is in the Ultra-
Deep Power-Down mode, all commands including the Status Register Read and Resume from Deep Power-Down
commands will be ignored. Since all commands will be ignored, the mode can be used as an extra protection mechanism
against inadvertent or unintentional program and erase operations. Entering the Ultra-Deep Power-Down mode is
accomplished by simply asserting the CS pin, clocking in the opcode 79h, and then deasserting the CS pin. Any
additional data clocked into the device after the opcode will be ignored. When the CS pin is deasserted, the device will
enter the Ultra-Deep Power-Down mode within the maximum time of t_EUDPD
The complete opcode must be clocked in before the CS pin is deasserted; otherwise, the device will abort the operation
and return to the standby mode once the CS pin is deasserted. In addition, the device will default to the standby mode
after a power cycle. The Ultra-Deep Power-Down command will be ignored if an internally self-timed operation such as a
program or erase cycle is in progress.
AT25DN011 26
DS-25DN011–038B–5/2014