Description The M5Stack Crypto Authentication Unit is a compact encryption coprocessor for hardware-based secure key storage and device identity. It integrates the ATECC608B hardware encryption chip and communicates through Grove I2C, giving M5Stack projects a protected way to store keys, certificates, data, consumption records, and security configuration. The ATECC608B secure element includes a guaranteed unique 72-bit serial number, 10Kb EEPROM, protected memory access policies, a random number generator, and support for ECC-P256, SHA256, and AES128-GCM. With pre-configured Trust&GO certificates, this I2C hardware security module can help IoT endpoints authenticate to TLS-based cloud platforms without exposing the private key. Note Trust&GO: the pre-configured Trust&GO security element only supports the Microchip Trust Platform. Refer to Microchip ATECC608B-TNGTLS for related platform details. Features ATECC608B-TNGTLSU-G: hardware encryption chip for secure authentication and key storage. I2C communication: Grove I2C interface at address 0x35 with up to 1Mbps bus speed. Protected storage: stores up to 16 keys, certificates, or data entries with lockable access policies. Security functions: supports data storage, locking, random number generation, and pre-configured certificates. Unique identity: each device includes a guaranteed unique 72-bit serial number. Protective enclosure: casing improves stability and reliability for embedded use. Specifications Encryption Chip Model ATECC608B-TNGTLSU-G Supported Algorithms ECC-P256 (ECDH and ECDSA), SHA256, AES128-GCM Supported Key Storage 16 Communication Port I2C @0x35, maximum bus speed 1Mbps Power Supply DC 5V Product Size 24.0 x 24.0 x 8.0mm Product Weight 3.3g Package Size 138.0 x 93.0 x 9.0mm Gross Weight 6.5g Applications IoT endpoint key management and exchange Device identity and cloud authentication Data encryption and secure storage TLS-based device registration for cloud platforms Embedded product security demonstrations and prototypes Product List 1 Unit ID 1 HY2.0-4P Grove Cable (5cm) Other Content The M5Stack Crypto Authentication Unit is designed for projects where a private key should remain protected inside a security chip. Host firmware can use the secure element to support identity, signing, random number generation, and certificate-based authentication workflows. Grove Pin Signal Black GND Red 5V Yellow SDA White SCL When using Trust&GO certificates, plan the cloud registration workflow around the supported Microchip Trust Platform path and verify platform compatibility before deployment. Resources Product documentation Schematic image Model size drawing ATECC608B datasheet Arduino library UIFlow1 documentation UIFlow2 documentation ESP-IDF AWS connection example Manifest generation guide Microchip Trust Platform reference FAQ What is the M5Stack Crypto Authentication Unit used for? It is used for secure key storage, device authentication, data encryption, and IoT endpoint identity workflows. Which chip is used inside the unit? The M5Stack Crypto Authentication Unit uses the ATECC608B-TNGTLSU-G hardware encryption chip. What I2C address does it use? The unit communicates through Grove I2C at address 0x35.
