W25Q32BVSSIG Winbond Electronics, W25Q32BVSSIG Datasheet - Page 55

• Manufacturer Part Number: W25Q32BVSSIG
• Description: IC SPI FLASH 32MBIT 8SOIC
• Manufacturer: Winbond Electronics

Specifications of W25Q32BVSSIG

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 32M (4M x 8)
• Speed: 104MHz
• Interface: SPI Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.2.34 Read Unique ID Number (4Bh)
The Read Unique ID Number instruction accesses a factory-set read-only 64-bit number that is unique to
each W25Q32BV device. The ID number can be used in conjunction with user software methods to help
prevent copying or cloning of a system. The Read Unique ID instruction is initiated by driving the /CS pin
low and shifting the instruction code “4Bh” followed by a four bytes of dummy clocks. After which, the 64-
bit ID is shifted out on the falling edge of CLK as shown in Figure 32.
(IO
(IO
(IO )
(IO
CLK
CLK
/CS
/CS
DO
DO
DI
DI
0
1
0
1
)
)
)
Mode 3
Mode 0
23
*
24
= MSB
25
0
Dummy Byte 3
26
1
27
Instruction (4Bh)
2
28
3
Figure 32. Read Unique ID Number Instruction Sequence
High Impedance
29
4
30
5
31
6
32
7
33
8
34
Dummy Byte 4
9
- 55 -
High Impedance
35
10
Dummy Byte 1
36
11
37
12
38
13
39
14
63
Publication Release Date: April 01, 2011
*
40
15
64-bit Unique Serial Number
62
41
16
61
42
17
18
Dummy Byte 2
19
W25Q32BV
2
20
1
21
0
22
Revision F
Mode 3
Mode 0
23