Micron M25P40 Serial Flash Embedded Memory
DEEP POWER-DOWN
DEEP POWER-DOWN
Executing the DEEP POWER-DOWN command is the only way to put the device in the
lowest power consumption mode, the DEEP POWER-DOWN mode. The DEEP POWER-
DOWN command can also be used as a software protection mechanism while the de-
vice is not in active use because in the DEEP POWER-DOWN mode the device ignores
all WRITE, PROGRAM, and ERASE commands.
Driving chip select (S#) HIGH deselects the device, and puts it in the STANDBY POWER
mode if there is no internal cycle currently in progress. Once in STANDBY POWER
mode, the DEEP POWER-DOWN mode can be entered by executing the DEEP POWER-
DOWN command, subsequently reducing the standby current from ICC1 to ICC2
.
To take the device out of DEEP POWER-DOWN mode, the RELEASE from DEEP POW-
ER-DOWN command must be issued. Other commands must not be issued while the
device is in DEEP POWER-DOWN mode. The DEEP POWER-DOWN mode stops auto-
matically at power-down. The device always powers up in STANDBY POWER mode.
The DEEP POWER-DOWN command is entered by driving S# LOW, followed by the
command code on serial data input (DQ0). S# must be driven LOW for the entire dura-
tion of the sequence.
S# must be driven HIGH after the eighth bit of the command code has been latched in.
Otherwise the DEEP POWER-DOWN command is not executed. As soon as S# is driven
HIGH, it requires a delay of tDP before the supply current is reduced to ICC2 and the
DEEP POWER-DOWN mode is entered.
Any DEEP POWER-DOWN command issued while an ERASE, PROGRAM, or WRITE cy-
cle is in progress is rejected without any effect on the cycle that is in progress.
Figure 18: DEEP POWER-DOWN Command Sequence
0
7
C
tDP
LSB
DQ0
Command
MSB
Standby Mode
Deep Power-Down Mode
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m25p40.pdf - Rev. Y 8/12 EN
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