4.3.7 Crypto Authentication

Several of the security devices, including CryptoAuthentication device like the ATECC508A, requires only an I2C interface to work, and they share the same package and pinouts. SAMC21N Xplained Pro has implemented 8-pad UDFN package ATECC508A-MAHDA-T device. Table 4-26 shows all the connections between the crypto device and the ATSAMC21N18A.

Table 4-26. Crypto Authentication Device Connection
Pin on footprintSAMC21N pinFunctionShared functionality
1-NC-
2-NC-
3-NC-
4-GND-
5PA16 [SDA]SERCOM1 PAD[0] I2C SDAEXT2, EXT3, Shield, and EDBG I2C
6PA17 [SCL]SERCOM1 PAD[1] I2C SCLEXT2, EXT3, Shield, and EDBG I2C
7-NC-
8-VCC_TARGET_P3V3-
PADDLE-GND-