AT97SC3204T-X1M80

Overview

The AT97SC3204T-X1M80 is a security module implementing the Trusted Computing Group (TCG) TPM Version 1.2 specification. It integrates an AVR RISC microprocessor, hardware asymmetric crypto engine, and RNG. The device communicates via a 33MHz LPC interface and supports SIRQ and CLKRUN for power management. It provides NV storage for 1280 bytes of user data and stores RSA keys in internal EEPROM. The chip operates on a 3.3V supply voltage.

Feature Summary

• Compliant with TCG TPM Version 1.2 and PC Client Specific TPM Interface Specification Version 1.2
• Hardware crypto engine computes 2048-bit RSA signatures in 200ms and 1024-bit in 40ms
• Integrated True Random Number Generator (RNG) compliant with FIPS 140-2
• Supports dynamic internal memory management for multiple RSA keys without system intervention

Applications

• Personal computers requiring trusted platform functionality
• Embedded systems needing secure authentication
• Mobile computers utilizing clock stopping features for power savings

Procurement Notes

Verify package availability as the component is offered in 28-lead Thin TSSOP, Wide TSSOP, or 40-lead QFN configurations. Confirm temperature range requirements against Commercial (0 to 70°C) and Industrial (-40 to +85°C) options. Ensure design includes necessary pull-ups for I2C pins if used in alternative modes, though LPC is primary.

Selection Notes

Select based on required operating temperature range and physical footprint constraints. The LPC interface requires specific bus connections including LAD0-LAD3, LCLK, and LFRAME#. Verify BIOS driver compatibility for the target operating system. Consider the 3.3V supply requirement and ensure adequate decoupling for the VCC and SB3V pins.

Part Context

This component belongs to the AT97SC3204 series of Trusted Platform Modules. It serves as a single-chip turnkey solution for OEM and ODM manufacturers. The device integrates firmware and device drivers to facilitate integration into PC platforms. It replaces discrete security components by consolidating cryptographic functions and key storage.

Replacement Considerations

Check for updated Microchip Technology equivalents if Atmel product lines have been consolidated. Verify pinout compatibility when substituting packages such as the 28A2, 28A3, or 40ML1 variants within the same family.