AT45DB321D datasheet(24/57 Pages) ATMEL

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3597N–DFLASH–04/09

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 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.

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 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.

Figure 12-2. Resume from Deep Power-Down

Command

Opcode

Deep Power-down

B9H

Opcode

Each transition

represents 8 bits

Command

Opcode

Resume from Deep Power-down

ABH

Opcode

Each transition

represents 8 bits

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