Microchip Technology AT97SC3204-X4A14-20

Overview

AT97SC3204-X4A14-20 from Microchip Technology (formerly Atmel) is a Trusted Platform Module (TPM) IC compliant with TCG TPM 1.2 and LPC Interface Specification 1.2. It integrates an AVR RISC microprocessor, hardware RSA crypto engine (2048-bit signature in 200ms), FIPS 140-2-compliant RNG, 3.3V supply, and 1756-byte NV user storage. It serves as a turnkey security root-of-trust in PC motherboards and embedded systems requiring hardware-based attestation.

For engineers reviewing the AT97SC3204-X4A14-20 datasheet, AT97SC3204-X4A14-20 pinout, AT97SC3204-X4A14-20 application, or AT97SC3204-X4A14-20 equivalent, key selection considerations include LPC bus timing compliance, industrial temperature range (-40°C to +85°C), 40-pin QFN package, TCG 1.2 firmware integration, and secure key storage in internal EEPROM.

Technical Context

The AT97SC3204-X4A14-20 implements a full TCG TPM 1.2 stack in silicon, including dedicated cryptographic acceleration for RSA-2048 (200ms sign), SHA-1 (20μs/64-byte block), and secure key generation via its FIPS 140-2-certified RNG. Its AVR CPU executes certified firmware with dynamic key cache management and no host intervention required for TPM_FlushSpecific or TPM_LoadKey2.

It interfaces exclusively via the 33MHz Low Pin Count (LPC) bus with support for SIRQ interrupt signaling and CLKRUN# clock gating for power management in mobile platforms. The device uses dual supply rails (VCC and SB3V), includes GPIO-Express-00 for platform-specific control, and enforces physical security through tamper-resistant layout and secure boot ROM.

Key Specifications

Pinout & Package

AT97SC3204-X4A14-20 is packaged in a 40-pad QFN (6.0 mm × 6.0 mm, 0.50 mm pitch, 0.9 mm height), per JEDEC MO-220 WJJD-2. This variant supports industrial temperature operation and surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TPM security module applications.

Compared with SLB9670 and NPCT750, the AT97SC3204-X4A14-20 delivers proven TCG 1.2 interoperability in legacy BIOS environments, industrial temperature resilience, and minimal driver integration overhead - making it optimal for cost-sensitive, long-lifecycle industrial PC and embedded controller upgrades.

Availability

AT97SC3204-X4A14-20 is available at Aetrix Electronics and suitable for desktop motherboard security, industrial embedded controllers, thin client endpoints, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for AT97SC3204-X4A14-20 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Atmel in 2016 and maintains its secure MCU and TPM product lines with full backward compatibility and long-term support commitments.

The AT97SC3204-X4A14-20 belongs to Atmel's Trusted Platform Module family, designed specifically to deliver certified, single-chip hardware roots of trust for PC client and industrial embedded platforms requiring TCG 1.2 compliance.

FAQ

What is the operating temperature range supported by the AT97SC3204-X4A14-20?

The AT97SC3204-X4A14-20 is rated for industrial operation from -40°C to +85°C. This specification is confirmed in the official Atmel ordering information and package documentation, and applies directly to the X4A14-20 variant. The extended range ensures reliable performance in harsh environments such as factory automation controllers and outdoor kiosks where ambient thermal stress exceeds commercial limits. AT97SC3204-X4A14-20 maintains full TCG 1.2 functionality across this entire range without derating.

Does the AT97SC3204-X4A14-20 support TPM 2.0?

No, the AT97SC3204-X4A14-20 implements only TCG TPM 1.2 and associated specifications (TIS 1.2, PC Client Specific). It does not support TPM 2.0 algorithms, command sets, or authorization structures. This limitation is explicitly stated in the summary datasheet and block diagram documentation. For TPM 2.0 compliance, designers must select alternatives such as the Infineon SLB9670 or Nuvoton NPCT750. AT97SC3204-X4A14-20 remains fully functional for legacy Windows 10 and earlier platforms requiring TPM 1.2.

What package type is used by the AT97SC3204-X4A14-20?

The AT97SC3204-X4A14-20 uses a 40-pad Very-thin Quad Flat No Lead (VQFN) package, designated 40ML1, with 6.0 mm × 6.0 mm body size, 0.50 mm pitch, and 0.9 mm maximum height. This is confirmed in the "Ordering Information" and "Package Drawings" sections of the official summary datasheet. The 40ML1 footprint differs electrically and mechanically from the 28-pin TSSOP variants and requires specific PCB land pattern and reflow profile validation for AT97SC3204-X4A14-20 assembly.

How does the AT97SC3204-X4A14-20 handle secure key storage?

The AT97SC3204-X4A14-20 stores RSA key pairs and endorsement credentials in internal EEPROM with hardware-enforced access controls and physical security circuitry. Keys never leave the die boundary and are inaccessible via debug interfaces or bus snooping. The datasheet confirms dedicated nonvolatile storage for 1756 bytes of user-defined data, managed exclusively by the on-chip AVR CPU executing certified firmware. AT97SC3204-X4A14-20 uses write-protection fuses and secure erase protocols to prevent unauthorized key extraction or modification.

Is the AT97SC3204-X4A14-20 pin-compatible with other Atmel TPM devices?

No, the AT97SC3204-X4A14-20 is not pin-compatible with earlier Atmel TPMs such as the AT97SC3203 or later variants like the AT97SC3205. Its 40-pin QFN (40ML1) layout differs significantly from the 28-pin TSSOP packages used in other members of the family. Pin functions such as GPIO-Express-00 and SB3V are unique to this variant's implementation. Board-level replacement requires PCB redesign. AT97SC3204-X4A14-20 must be treated as a distinct layout and routing entity in schematic capture and layout tools.