AT97SC3205T-U3A1620B

Overview

The AT97SC3205T-U3A1620B is a Trusted Platform Module (TPM) compliant with the TCG TPM Version 1.2 specification. It features an I2C interface supporting 400kHz Fast Mode and 100kHz Standard Mode operation. The device integrates an Atmel AVR RISC microprocessor, a hardware asymmetric crypto engine, and internal EEPROM storage for RSA keys. It includes a FIPS-140-2 certified high-quality random number generator (RNG), HMAC, AES, SHA, and RSA engines. The component operates on a 3.3V supply voltage and provides 2066 bytes of NV storage for user-defined data.

Feature Summary

• Compliant with TCG TPM Version 1.2 Specification
• I2C Interface: 400kHz Fast Mode / 100kHz Standard Mode
• Hardware Asymmetric Crypto Engine with FIPS-140-2 Certification
• Internal EEPROM Storage for RSA Keys

Applications

• Embedded systems requiring secure authentication
• Hardware physical presence detection
• Low-power sleep recovery applications

Procurement Notes

Verify the specific ordering suffix U3A1620B against official Microchip or Atmel catalogs to confirm package type and temperature range. Confirm availability status as this component series may have limited stock or end-of-life implications. Ensure compatibility with existing I2C pull-up resistor values (800 ohms for SM_DAT, 1.5K ohms for SM_CLK) for stable communication at rated speeds.

Selection Notes

Select between the 28-lead Thin TSSOP or 32-pad QFN packages based on board space constraints. Ensure the operational temperature range matches the application environment, as the device is offered in Commercial (0°C to 70°C) and Industrial (-40°C to 85°C) variants. Verify that the system can provide the required 3.3V supply with adequate decoupling (2200pF to 4700pF capacitors close to VCC pins).

Part Context

The AT97SC3205T is part of the Atmel TPM family, now under Microchip Technology following the acquisition of Atmel Corporation. It serves as a single-chip turnkey solution for implementing trusted computing standards in embedded devices. The device integrates security functions directly onto the main processor bus via I2C, reducing system complexity compared to discrete security components.

Replacement Considerations

Check for direct replacements within the AT97SC3205T series with different suffixes indicating package or temperature variations. Consider other TCG TPM 1.2 compliant devices from Microchip or Infineon if pin-out compatibility is not required. Verify firmware command set compatibility when substituting with similar TPMs.