ACE25QC200GL datasheet(30/64 Pages) ACE

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ACE25QC200GL

2M BIT SPI NOR FLASH

VER 1.1

The /CS pin must be driven high after the eighth bit has been latched. If this is not done the Power-down

instruction will not be executed. After /CS is driven high, the power- down state will entered within the time

duration of tDP (See AC Characteristics). While in the power-down state only the Release Power-down /

Device ID (ABh) instruction, which restores the device to normal operation, will be recognized. All other

instructions are ignored. This includes the Read Status Register instruction, which is always available

during normal operation. Ignoring all but one instruction makes the Power Down state a useful condition for

securing maximum write protection.

The device always powers-up in the normal operation with the standby current of ICC1

Release Power-down / Device ID (ABh)

The Release from Power-down / Device ID instruction is a multi-purpose instruction. It can be used to

release the device from the power-down state, or obtain the devices electronic identification (ID) number.

To release the device from the power- down state, the instruction is issued by driving the /CS pin low,

shifting the instruction code “ABh” and driving /CS high as shown in Figure 18.Release from power-down

will take the time duration of tRES1 (See AC Characteristics) before the device will resume normal

operation and other instructions are accepted. The /CS pin must remain high during the tRES1 time

duration.

When used only to obtain the Device ID while not in the power-down state, the instruction is initiated by

driving the /CS pin low and shifting the instruction code “ABh” followed by 3-dummy bytes. The Device ID

bits are then shifted out on the falling edge of SCLK with most significant bit (MSB) first. The Device ID

value for the ACE25QC200GL is listed in Manufacturer and Device Identification table. The Device ID can

be read continuously. The instruction is completed by driving /CS high.

When used to release the device from the power-down state and obtain the Device ID, the instruction is the

same as previously described, and shown in Figure 18, except that after /CS is driven high it must remain

high for a time duration of tRES2 (See AC Characteristics) . After this time duration the device will resume

normal operation and other instructions will be accepted. If the Release from Power- down / Device ID

instruction is issued while an Erase, Program or Write cycle is in process (when WIP equals 1) the

instruction is ignored and will not have any effects on the current cycle.

Figure17. Deep Power-down Instruction

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