Instruction Manual

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3597J–DFLASH–4/08
AT45DB321D
12. Deep Power-down
After initial power-up, the device will default in standby mode. The Deep Power-down command
allows the device to enter into the lowest power consumption mode. To enter the Deep Power-
down mode, the CS
pin must first be asserted. Once the CS pin has been asserted, an opcode
of B9H command must be clocked in via input pin (SI). After the last bit of the command has
been clocked in, the CS
pin must be de-asserted to initiate the Deep Power-down operation.
After the CS
pin is de-asserted, the will device enter the Deep Power-down mode within the
maximum t
EDPD
time. Once the device has entered the Deep Power-down mode, all instructions
are ignored except for the Resume from Deep Power-down command.
Figure 12-1. Deep Power-down
12.1 Resume from Deep Power-down
The Resume from Deep Power-down command takes the device out of the Deep Power-down
mode and returns it to the normal standby mode. To Resume from Deep Power-down mode, the
CS
pin must first be asserted and an opcode of ABH command must be clocked in via input pin
(SI). After the last bit of the command has been clocked in, the CS
pin must be de-asserted to
terminate the Deep Power-down mode. After the CS
pin is de-asserted, the device will return to
the normal standby mode within the maximum t
RDPD
time. The CS pin must remain high during
the t
RDPD
time before the device can receive any commands. After resuming form Deep Power-
down, the device will return to the normal standby mode.
Figure 12-2. Resume from Deep Power-Down
Command Opcode
Deep Power-down B9H
Opcode
CS
Each transition
represents 8 bits
SI
Command Opcode
Resume from Deep Power-down ABH
Opcode
CS
Each transition
represents 8 bits
SI