AS39513 datasheet(14/108 Pages) AMSCO

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ams Datasheet

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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Data Protection

The 9-kbit EEPROM is accessed through a controller that

manages the overall chip operation. Every address in the

memory map is assigned to one of four types of access levels.

There is write protection for three memory areas (System,

Application, and Measurement) using three different 32-bit

passwords. All three memory areas are open for read at all times.

A fourth memory area, called the Factory area, is much more

restricted and is not accessible via RF except for the lock bits

and passwords. This is used for passwords, memory lock bits,

and some calibration information.

For the Application, Measurement and System Access areas the

access via RF remains open until the RF field is removed (the

access via RF will close with the loss of RF field even if the logic

is continuously powered by an external battery). Note if the chip

is powered by a battery these areas will still be accessible by SPI.

The chip also supports a one-time use secure mode. When this

mode is used, the RFID write capability for all Application and

Measurement blocks is blocked. The measurement area can still

be written through the logging operations, but the logging

results cannot be overwritten through the RFID interface even

if the 32-bit password is known.

AS39513 Datasheet(PDF) 14 Page - ams AG