25AA512 datasheet(18/36 Pages) MICROCHIP

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25AA512

DS22021F-page 18

 2010 Microchip Technology Inc.

2.11

DEEP POWER-DOWN MODE

Deep Power-Down mode of the 25AA512 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

SCK

High-Impedance

25AA512 Datasheet(PDF) 18 Page - Microchip Technology