A25L16P Series
Deep Power-down (DP)
Executing the Deep Power-down (DP) instruction is the only
way to put the device in the lowest consumption mode (the
Deep Power-down mode). It can also be used as an extra
software protection mechanism, while the device is not in
active use, since in this mode, the device ignores all Write,
Program and Erase instructions.
The Deep Power-down mode automatically stops at
Power-down, and the device always Powers-up in the
Standby mode.
The Deep Power-down (DP) instruction is entered by driving
S
Chip Select ( ) Low, followed by the instruction code on
S
Serial Data Input (DIO). Chip Select ( ) must be driven Low
S
Driving Chip Select ( ) High deselects the device, and puts
for the entire duration of the sequence. The instruction
sequence is shown in Figure 15.
the device in the Standby mode (if there is no internal cycle
currently in progress). But this mode is not the Deep
Power-down mode. The Deep Power-down mode can only
be entered by executing the Deep Power-down (DP)
S
Chip Select ( ) must be driven High after the eighth bit of
the instruction code has been latched in, otherwise the Deep
Power-down (DP) instruction is not executed. As soon as
instruction, to reduce the standby current (from ICC1 to ICC2
as specified in DC Characteristics Table.).
,
S
Chip Select ( ) 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 (DP) instruction, while an Erase,
Program or Write cycle is in progress, is rejected without
having any effects on the cycle that is in progress.
Once the device has entered the Deep Power-down mode,
all instructions are ignored except the Release from Deep
Power-down and Read Electronic Signature (RES)
instruction. This releases the device from this mode. The
Release from Deep Power-down and Read Electronic
Signature (RES) instruction also allows the Electronic Signa-
ture of the device to be output on Serial Data Output (DO).
Figure 15. Deep Power-down (DP) Instruction Sequence
S
tDP
1
3
0
2
4
5
6
7
C
Instruction
DO
Stand-by Mode
Deep Power-down Mode
PRELIMINARY (April, 2007, Version 0.6)
21
AMIC Technology Corp.
AMICC [ AMIC TECHNOLOGY ]
