Prepaid energy meter IC card for money recharge
I. main indicators:
A 32-bit protection memory;
Low of 256 bytes;
3 byte user password, password error count: 3 times;
Low temperature range: 0 ℃ ~ 70 ℃;
At least 100,000 scratch-writing;
At least 10 years data retention period.
Working voltage: 5V.
Ii. Confidentiality:
1. Each byte of the protected area (the first 32 bytes) can be
individually written and protected, and the content is not
Rechangeable (i.e., solidified data).
2. Before the password is checked correctly, all data can be read.
If necessary, the data can be properly encrypted.
3. If the password is correct, it can be written or modified.
4. Three bytes of user password, check the correct after itself can
be changed, effective until the card.
5. The password error counter, the initial value is 3, the password
is checked for error 1 time, and then minus 1, if the counter value
is 0, then
The card is automatically locked, the data can be read out and
cannot be changed or password checked again.If it's not zero,
Once the password is checked correctly, the initial value can be
restored.
6. The byte address 21 ~ 26 is the user code, which can be used by
our company to set up a global unique code for large users
User unified distribution (all CARDS are not to be modified after
delivery).
7. The byte address 0 ~ 5, 6 ~ 7 is written by the manufacturer
before leaving the factory, which cannot be changed.
Third, pay attention to
The code area is also addressed, not in 0~255 bytes.
