25AA1024 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

25AA1024

1 Mbit SPI Bus Serial EEPROM

Microchip Technology 

25AA1024/25LC1024

2.11 DEEP POWER-DOWN MODE

Deep Power-Down mode of the 25XX1024 is its

lowest power consumption state. The device will not

respond to any of the Read or Write commands while

in Deep Power-Down mode, and therefore it can be

used as an additional software write protection feature.

The Deep Power-Down mode is entered by driving CS

low, followed by the instruction code (Figure 2-11) onto

the SI line, followed by driving CS high.

If the CS pin is not driven high after the eighth bit of the

instruction code has been given, the device will not

execute Deep power-down. Once the CS line is driven

high, there is a delay (TDP) before the current settles

to its lowest consumption.

All instructions given during Deep Power-Down mode

are ignored except the Read Electronic Signature

Command (RDID). The RDID command will release

the device from Deep power-down and outputs the

electronic signature on the SO pin, and then returns

the device to Standby mode after delay (TREL)

Deep Power-Down mode automatically releases at

device power-down. Once power is restored to the

device, it will power-up in the Standby mode.

FIGURE 2-11:

DEEP POWER-DOWN SEQUENCE

CS

SCK

01234567

SI

10111001

High-Impedance

SO

© 2007 Microchip Technology Inc.

Preliminary

DS21836D-page 17

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