25AA512-I/MF Microchip Technology, 25AA512-I/MF Datasheet - Page 13
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25AA512-I/MF
Manufacturer Part Number
25AA512-I/MF
Description
512k, 64K X 8 , 1.8V SER EE IND 8 DFN-S 6X5MM TUBE
Manufacturer
Microchip Technology
Datasheet
1.25AA512-ISN.pdf
(36 pages)
Specifications of 25AA512-I/MF
Format - Memory
EEPROMs - Serial
Memory Type
EEPROM
Memory Size
512K (64K x 8)
Speed
20MHz
Interface
SPI, 3-Wire Serial
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
25AA512-I/MF
Manufacturer:
MICROCHIP
Quantity:
12 000
Part Number:
25AA512-I/MF
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
2.5
The Write Status Register instruction (WRSR) allows the
user to write to the nonvolatile bits in the STATUS
register as shown in Table 2-2. The user is able to
select one of four levels of protection for the array by
writing to the appropriate bits in the STATUS register.
The array is divided up into four segments. The user
has the ability to write-protect none, one, two or all four
of the segments of the array. The partitioning is
controlled as shown in Table 2-3.
TABLE 2-3:
FIGURE 2-7:
2010 Microchip Technology Inc.
SCK
CS
SO
SI
BP1
Write Status Register Instruction
(WRSR)
0
0
1
1
0
0
ARRAY PROTECTION
0
WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)
1
BP0
0
0
1
0
1
Instruction
2
0
3
0
4
Upper 1/2 (Sectors 2 & 3)
All (Sectors 0, 1, 2 & 3)
Upper 1/4 (Sector 3)
0
Array Addresses
Write-Protected
5
(C000h-FFFFh)
(8000h-FFFFh)
(0000h-FFFFh)
High-Impedance
0
none
6
1
7
The Write-Protect Enable (WPEN) bit is a nonvolatile
bit that is available as an enable bit for the WP pin. The
Write-Protect (WP) pin and the Write-Protect Enable
(WPEN) bit in the STATUS register control the
programmable hardware write-protect feature. Hard-
ware write protection is enabled when WP pin is low
and the WPEN bit is high. Hardware write protection is
disabled when either the WP pin is high or the WPEN
bit is low. When the chip is hardware write-protected,
only writes to nonvolatile bits in the STATUS register
are disabled. See Table 2-4 for a matrix of functionality
on the WPEN bit.
See Figure 2-7 for the WRSR timing sequence.
7
8
6
9
Data to STATUS Register
10
5
Lower 3/4 (Sectors 0, 1 & 2)
11
4
Lower 1/2 (Sectors 0 & 1)
All (Sectors 0, 1, 2 & 3)
Array Addresses
(0000h-FFFFh)
(0000h-BFFFh)
12
3
(0000h-7FFFh)
Unprotected
none
13
2
25AA512
14
1
DS22021F-page 13
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