AT97SC3204-U1A190

Overview

The AT97SC3204-U1A190 is a security integrated circuit implementing the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 specification. It features an AVR RISC microprocessor and a hardware asymmetric crypto engine capable of performing a 2048-bit RSA signature in 200ms and a 1024-bit RSA signature in 40ms. The SHA-1 accelerator processes data at 20µs per 64-byte block. Communication with the host system occurs via a 33MHz Low Pin Count (LPC) bus, supporting SIRQ interrupts and CLKRUN for power management. The device includes a FIPS 140-2 compliant True Random Number Generator (RNG), internal EEPROM storage for RSA keys, and 1280 bytes of non-volatile user-defined data storage.

Feature Summary

• Full TCG TPM Version 1.2 compatibility
• Hardware crypto engine: 2048-bit RSA in 200ms, 1024-bit RSA in 40ms
• SHA-1 accelerator performance of 20µs per 64-byte block
• FIPS 140-2 compliant True Random Number Generator (RNG)
• Internal EEPROM for RSA key storage and 1280-byte NV user data

Applications

• Personal computers requiring TPM integration
• Embedded systems needing secure authentication
• Mobile computers utilizing LPC CLKRUN for power savings

Procurement Notes

Verify package availability as the datasheet lists 28-lead Thin TSSOP, 28-lead TSSOP, and 40-lead QFN options. Confirm temperature range requirements against Commercial (0 to 70°C) and Industrial (-40 to +85°C) grades. Ensure design supports 3.3V supply voltage and LPC interface timing specifications.

Selection Notes

Select based on required package type: 28A2 (Thin TSSOP), 28A3 (TSSOP), or 40ML1 (QFN). Verify operating temperature range suitability for the target environment. Ensure the host system provides a 33MHz LPC clock and supports necessary control signals like LRESET#, LFRAME#, and SERIRQ.

Part Context

The AT97SC3204 series serves as a turnkey security solution for OEMs and ODMs, integrating firmware directly onto the chip. It simplifies PC platform security by providing a single-chip implementation of TPM 1.2 standards, reducing integration complexity compared to discrete cryptographic components.

Replacement Considerations

Check for updated TPM versions (e.g., TPM 2.0) if newer security standards are required. Verify pinout and package dimensions when substituting between different lead counts (28 vs 40 pins).