AT45DB021D-SU Atmel, AT45DB021D-SU Datasheet - Page 22

• Manufacturer Part Number: AT45DB021D-SU
• Description: Flash 2M SERIAL 2.7V - IND TEMP
• Manufacturer: Atmel

Specifications of AT45DB021D-SU

• Product Category: Flash
• Rohs: yes
• Memory Size: 2 Mbit
• Architecture: Sectored
• Interface Type: SPI
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V
• Maximum Operating Current: 15 mA
• Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC
• Organization: 32 KB x 8
• Factory Pack Quantity: 95

12.1
22
two bytes of Device ID information. The fourth byte output will be the Extended Device Information String Length,
which will be 00H indicating that no Extended Device Information follows. As indicated in the JEDEC standard,
reading the Extended Device Information 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.
Manufacturer and Device ID Information
Table 12-1.
Table 12-2.
Table 12-3.
Table 12-4.
Note:
CS
SO
Value
Value
Value
Value
Atmel AT45DB021D
SI
1FH
Hex
Hex
23H
Hex
00H
Hex
00H
Each transition
represents 8 bits
Based on JEDEC publication 106 (JEP106), Manufacturer ID data can be comprised of any number of bytes. Some
manufacturers may have Manufacturer ID codes that are two, three or even four bytes long with the first byte(s) in the
sequence being 7FH. A system should detect code 7FH as a “Continuation Code” and continue to read Manufacturer
ID bytes. The first non-7FH byte would signify the last byte of Manufacturer ID data. For Atmel (and some other manu-
facturers), the Manufacturer ID data is comprised of only one byte.
Bit 7
Bit 7
Bit 7
Bit 7
0
0
0
0
Family Code
MLC Code
Byte 1 – Manufacturer ID
Byte 2 – Device ID (Part 1)
Byte 3 – Device ID (Part 2)
Byte 4 – Extended Device Information String Length
Bit 6
Bit 6
Bit 6
Bit 6
Opcode
0
0
0
0
9FH
Bit 5
Bit 5
Bit 5
Bit 5
0
1
0
0
Manufacturer ID
JEDEC Assigned Code
Byte n
1FH
Bit 4
Bit 4
Bit 4
Bit 4
Byte Count
1
0
0
0
Product Version Code
Bit 3
Bit 3
Bit 3
Bit 3
1
0
0
0
Device ID
Byte 1
Density Code
23H
Bit 2
Bit 2
Bit 2
Bit 2
1
0
0
0
Bit 1
Bit 1
Bit 1
Bit 1
Device ID
Byte 2
1
1
0
0
00H
Bit 0
Bit 0
Bit 0
Bit 0
1
1
0
0
String Length
Information
Extended
Device
00H
if the Extended Device Information String Length
Manufacturer ID
Family Code
Density Code
MLC Code
Product Version
Byte Count
This information would only be output
value was something other than 00H.
Information
Extended
Device
Byte x
Data
Information
Byte x + 1
Extended
Device
1FH = Atmel
00011 = 2-Mbit
00000 = Initial Version
00H = 0 Bytes of Information
Data
001 = DataFlash
000 = 1-bit/Cell Technology
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