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Secure click


25 g

Secure click carries the ATECC508A cryptographic coprocessor with secure hardware-based key storage. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over I2C interface.

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Quantity Unit Price
5 $8.55
20 $8.10
Secure click carries the ATECC508A cryptographic coprocessor with secure hardware-based key storage. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over I2C interface.

ATECC508A features

Microchip's ATECC508A integrates ECDH (Elliptic Curve Diffie Hellman) security protocol, an ultra-secure method to provide key agreement for encryption/decryption. It also integrates the ECDSA (Elliptic Curve Digital Signature Algorithm) sign-verify authentication for the Internet of Things (IoT) market, including home automation, industrial networking, accessory and consumable authentication, medical, mobile and more.

The ATECC508A includes an EEPROM array which can be used for storage of up to 16 keys, certificates, miscellaneous read/write, read-only or secret data, consumption logging, and security configurations. Access to the various sections of memory can be restricted in a variety of ways and then the configuration can be locked to prevent changes.

It features a wide array of defense mechanisms specifically designed to prevent physical attacks on the device itself, or logical attacks on the data transmitted between the device and the system. Hardware restrictions on the ways in which keys are used or generated provide further defense against certain styles of attack.


Applications IoT node security and ID, secure download and boot, ecosystem control, message security, anti-cloning, etc.
On-board modules ATECC508A cryptographic co-processor
Key Features Performs high-speed public key (PKI) algorithms, NIST Standard P256 elliptic curve support, SHA-256 hash algorithm with HMAC option, 256-bit key length, storage for up to 16 Keys
Interface I2C
Input Voltage 3.3V or 5V
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on Secure click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
NC 2 RST INT 15 NC  
NC 3 CS TX 14 NC
NC 5 MISO SCL 12 SCL I2C clock
NC 6 MOSI SDA 11 SDA I2C data
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground

Jumpers and settings

DesignatorNameDefault PositionDefault OptionDescription
JP1 PWR.SEL. Left 3.3V Power Supply Voltage Selection 3.3V/5V, left position 3.3V, right position 5V


Code examples for Secure click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet gets the public key from slot 0, generates the signature for a message using that key, and then verifies that signature.

01 if (atcab_get_pubkey(0, publicKeyBuffer) == ATCA_SUCCESS)
02     {
03         LOG( "rnrn Public key: " );
04         outputHex (publicKeyBuffer, 64);
05     }
06     else  LOG( "rn Getting public key failed..." );
07     //Generates the signature from input message, using key in slot 0.
08     if (atcab_sign(0, messageBuffer, signatureBuffer) == ATCA_SUCCESS)
09     {
10         LOG( "rnrn Generating signature: " );
11         outputHex (signatureBuffer, 64);
12     }
13     else  LOG( "rn Generating signature failed..." );
14     //Verification of signature
15     LOG( "rnrn Signature verification..." );
16     if (atcab_verify_extern(messageBuffer, signatureBuffer, publicKeyBuffer, responseBuffer) == ATCA_SUCCESS)
17     {
18         if (responseBuffer [0])
19              LOG( "rn Signature is valid " );
20         else LOG( "rn Signature is invalid " );
21     }
22     else  LOG( "rn Verification operation failed..." );


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