79LV2040RPFE-20 MAXWELL [Maxwell Technologies], 79LV2040RPFE-20 Datasheet - Page 14

• Manufacturer Part Number: 79LV2040RPFE-20
• Description: 20 Megabit (512K x 40-Bit) Low Voltage EEPROM MCM
• Manufacturer: MAXWELL [Maxwell Technologies]

5. Writing to the Memory with Software Data Protection Enabled
6. Disabling Software Protection
Devices are shipped in the “unprotected” state, meaning that the contents of the memory can be changed as
required by the user. After the software data protection is enabled, the device enters the Protect Mode
where no further write commands have any effect on the memory contents.
20 Megabit (512K x 40-Bit) EEPROM MCM
To write to the device once Software protection is enabled, the enable sequence must precede the data to be written. This
sequence allows the write to occur while at the same time keeping the software protection enabled
Software data protection mode can be disabled by inputting the following 6 bytes sequence. Once the software protection
sequence has been written, no data can be written to the memory until the write cycle (T
Sequence for Writing Data with Software Protection Enabled
AAAA or 2AAA
AAAA or 2AAA
AAAA or 2AAA
Write Address(s)
Software Protection Disable Sequence
Address
Address
5555
5555
5555
5555
5555
5555
09.07.05 Rev 1
AA AA AA AA AA
Normal Data Input
A0 A0 A0 A0 A0
AA AA AA AA AA
AA AA AA AA AA
55 55 55 55 55
55 55 55 55 55
20 20 20 20 20
All data sheets are subject to change without notice
80 80 80 80 80
55 55 55 55 55
Data
Data
WC
) has elapsed.
.
79LV2040
©2005 Maxwell Technologies
All rights reserved
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