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 device will enter the Deep Power-down mode within the
maximum tEDPD time. Once the device has entered the Deep Power-down mode, all instructions
are ignored except for the Resume from Deep Power-down command.
Command
Opcode
Deep Power-down
B9H
Figure 12-1. Deep Power-down
CS
SI
Opcode
Each transition
represents 8 bits
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 tRDPD time. The CS pin must remain high during
the tRDPD time before the device can receive any commands. After resuming form Deep Power-
down, the device will return to the normal standby mode.
Command
Opcode
Resume from Deep Power-down
ABH
Figure 12-2. Resume from Deep Power-Down
CS
Opcode
SI
Each transition
represents 8 bits
24
AT45DB321D
3597N–DFLASH–04/09
ATMEL [ ATMEL ]
