5.1 Calibration Packet Address

The temperature sensor calibration data are stored in a regular OTP packet. The physical address of this packet may vary from device to device, therefore identifying this packet must be done by searching for a regular packet located at the second position in the OTP array. To help recognize this packet, the first 32-bit word is programmed with the constant value 'TSCA'.

Important: Out-of-factory, the first packet of the OTP memory is intentionally left blank to enable use of the OTPC Emulation mode. At that stage, the temperature sensor calibration data cannot be read. To read these data, a boot configuration packet must be first programmed in the OTP memory. After this, the OTP Emulation mode is not available anymore. Refer to the “OTP Memory Controller (OTPC)” and “Boot Strategies” sections of the SAMA7G5 Series data sheet for more details.