ES25P40 datasheet(21/35 Pages) EXCELSEMI

21 / 35 page

ES I

Rev. 0D May 11 , 2006

ES25P40

Excel Semiconductor inc.

ADVANCED INFORMATION

Deep Power Down (DP)

The Deep Power Down (DP) instruction puts the

device in the lowest current mode of 1uA typical.

It is recommended that the standard Standby mode

be used for the lowest power current draw, as well as

the Deep Power Down (DP) as an extra software

protection mechanism when this device is not in

active use. In this mode, the device ignores all Write,

Program and Erase instructions. Chip Select (CS#)

must be driven Low for the entire duration of the

sequence.

The Deep Power Down (DP) instruction is entered by

driving Chip Select (CS#) Low, followed by the

instruction code on Serial Data Input (SI). Chip

Select (CS#) must be driven Low for the entire dura-

tion of the sequence.

The instruction sequence is shown in Figure 16.

Driving Chip Select (CS#) High after the eighth bit of

the instruction code has been latched puts the device

in Deep Power Down mode.

The Deep Power Down mode can only be entered

by executing the Deep Power Down (DP) instruc-

tion to reduce the standby current (from ISB to IDP

as specified in Table 6). As soon as Chip Select

(CS#) is driven high, it requires a delay of tDP cur-

rently in progress before Deep Power Down mode

is entered.

Once the device has entered the Deep Power

Down mode, all instructions are ignored except the

Release from Deep Power Down (RES) and Read

Electronic Signature. This releases the device from

the Deep Power Down 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 Out-

put (SO).

The Deep Power Down mode automatically stops

at Power-down, and the device always powers up

in the Standby mode.

Any Deep Power Down (DP) instruction, while an

Erase, Program or WRSR cycle is in progress, is

rejected without having any effect on the cycle in

progress.

Figure 16. Deep Power Down ( DP ) Instruction Sequence

CS#

Standby Mode

Instruction

Deep Power

Down Mode

tDP

SCK

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