AT25PE20 datasheet(32/64 Pages) DIALOG

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AT25PE20

DS-25PE20–139C–8/2018

12.

Manufacturer and Device ID Read

Identification information can be read from the device to enable systems to electronically query and identify the device

while it is in the system. The identification method and the command opcode comply with the JEDEC Standard for

“Manufacturer and Device ID Read Methodology for SPI Compatible Serial Interface Memory Devices”. The type of

information that can be read from the device includes the JEDEC-defined Manufacturer ID, the vendor-specific

Device ID, and the vendor-specific Extended Device Information.

The Read Manufacturer and Device ID command is limited to a maximum clock frequency of fCLK. Since not all Flash

devices are capable of operating at very high clock frequencies, applications should be designed to read the

identification information from the devices at a reasonably low clock frequency to ensure that all devices to be used in the

application can be identified properly. Once the identification process is complete, the application can then increase the

clock frequency to accommodate specific Flash devices that are capable of operating at the higher clock frequencies.

To read the identification information, the CS pin must first be asserted, and then the opcode 9Fh must be clocked into

the device. After the opcode has been clocked in, the device will begin outputting the identification data on the SO pin

during the subsequent clock cycles. The first byte to be output will be the Manufacturer ID, followed by two bytes of the

Device ID information. The fourth byte output will be the Extended Device Information (EDI) String Length, which will be

01h, indicating that one byte of EDI data follows. After the one byte of EDI data is output, the SO pin will go into a

high-impedance state; therefore, additional clock cycles will have no affect on the SO pin and no data will be output. As

indicated in the JEDEC Standard, reading the EDI String Length and any subsequent data is optional.

Deasserting the CS pin will terminate the Manufacturer and Device ID Read operation and put the SO pin into a

high-impedance state. The CS pin can be deasserted at any time and does not require that a full byte of data be read.

Table 12-1. Manufacturer and Device ID Information

Byte No.

Data Type

Value

Manufacturer ID

1Fh

Device ID (Byte 1)

23h

Device ID (Byte 2)

00h

Extended Device Information (EDI) String Length

01h

[Optional to Read] EDI Byte 1

00h

Table 12-2. Manufacturer and Device ID Details

Data Type

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Hex

Value

Details

Manufacturer ID

JEDEC Assigned Code

1Fh

JEDEC code: 0001 1111 (1Fh for Adesto)

Device ID (Byte 1)

Family Code

Density Code

23h

Family code:

001 (AT45Dxxx Family)

Density code: 00011 (2-Mbit)

Device ID (Byte 2)

Sub Code

Product Variant

00h

Sub code:

000 (Standard Series)

Product variant:00000

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