AT25DF321A datasheet(38/53 Pages) ETC2

38 / 53 page

3686F–DFLASH–1/2014

AT25DF321A

Figure 12-2.Read Manufacturer and Device ID

12.3

Deep Power-Down

During normal operation, the device will be placed in the standby mode to consume less power as long as the CS pin remains

deasserted and no internal operation is in progress. The Deep Power-Down command offers the ability to place the device into

an even lower power consumption state called the Deep Power-Down mode.

When the device is in the Deep Power-Down mode, all commands including the Read Status Register command will be

ignored with the exception of the Resume from Deep Power-Down command. Since all commands will be ignored, the mode

can be used as an extra protection mechanism against program and erase operations.

Entering the Deep Power-Down mode is accomplished by simply asserting the CS pin, clocking in the opcode of B9h, 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 Deep Power-Down mode within the maximum time of tEDPD.

The complete opcode must be clocked in before the CS pin is deasserted, and the CS pin must be deasserted on an even byte

boundary (multiples of eight bits); 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 Deep Power-Down command will be ignored if an internally self-timed operation such as a program or erase cycle is in

progress. The Deep Power-Down command must be reissued after the internally self-timed operation has been completed in

order for the device to enter the Deep Power-Down mode.

SCK

9Fh

OPCODE

1Fh

47h

01h

00h

MANUFACTURER ID

DEVICE ID

BYTE 1

DEVICE ID

BYTE 2

EXTENDED

DEVICE

INFORMATION

STRING LENGTH

HIGH-IMPEDANCE

Note: Each transition

shown for SI and SO represents one byte (8 bits)

AT25DF321A датащи(PDF) 38 Page - List of Unclassifed Manufacturers