Secure 3 click

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  • MIKROE-2761
  • MIKROE-2761
Secure 3 click  carries the  ATSHA204A , a cryptographic coprocessor with secure...more
Product information "Secure 3 click"

Secure 3 click carries the ATSHA204A, a cryptographic coprocessor with secure hardware-based key storage from Microchip. The click is designed to run on either 3.3V or 5V power supply. Secure 3 click communicates with the target microcontroller over an I2C interface. 

It is ideal to use for:

  • Secure download and boot - authentication and protect code in-transit
  • Ecosystem control - ensure only OEM/licensed nodes and accessories work
  • Anti-cloning - prevent building with identical BOM or stolen code
  • Message security - authentication, message integrity, and confidentiality of network nodes (IoT)

NOTE: The click comes with stacking headers which allow you to combine it with other clicks more easily by using just one mikroBUS™ socket.

ATSHA204A features

The ATSHA204A is a member of the Microchip CryptoAuthentication™ family of high-security hardware authentication devices, which uses Secure Hash Algorithm (SHA-256) with 256-bit key length, message authentication code (MAC) and hash-based message authentication code (HMAC) options. It has a flexible command set that allows use in many applications.

The ATSHA204A device includes an Electrically Erasable Programmable Read-Only Memory (EEPROM) array that can be used for key storage, miscellaneous read/write data, read-only, secret data, consumption logging, and security configuration. Access to the various sections of memory can be restricted in a variety of ways, and the configuration can then be locked to prevent changes.


On-board modules ATSHA204A - a cryptographic coprocessor with secure hardware-based key storage
Key Features superior SHA-256 hash algorithm with 256-bit key length, message authentication code (MAC) and hash-based message authentication code (HMAC) options, storage for up to sixteen keys
Key Benefits cost-effective symmetric authentication solution
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 3 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
  NC 1 AN PWM 16 NC  
  NC 2 RST INT 15 NC  
  NC 3 CS TX 14 NC  
  NC 4 SCK RX 13 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 VIO SEL. Left 3V3 Power Supply Voltage Selection 3V3/5V, left position 3V3, right position 5V


Code examples for Secure 3 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet creates a MAC for a given input and then checks if it is valid using verify function.

01 static void MACTest ()
02 {
03     //Generates nonce for use in MAC generation
04     memset (bufferIn, 0x45, 128);
05     if (atcab_nonce(bufferIn) == ATCA_SUCCESS)
06     {
07         LOG( "rnrn Nonce generated." );
08     }
09     else  LOG( "rnrn Nonce generation failed..." );
10     delay_ms (1500);
12    //Generates MAC for given input
13     memset (bufferOut, 0x00, 128);
14     memset (bufferIn, 0x14, 128);
15     if (atcab_mac( 0, 0, bufferIn, bufferOut ) == ATCA_SUCCESS)
16     {
17         LOG( "rnrn MAC generated: " );
18         outputHex (bufferOut, 32);
19     }
20     else  LOG( "rnrn Mac generation failed..." );
21      delay_ms (1500);
23    //Checks if the generated MAC is valid
24     memset (bufferIn, 0x14, 128);
25     if (atcab_checkmac( 0, 0, bufferIn, bufferOut, otherData) == ATCA_SUCCESS)
26     {
27         LOG( "rnrn Check MAC successful. " );
28     }
29     else  LOG( "rnrn Check MAC failed..." );
30 }


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