Microchip Technology AT97SC3204-X2MA-20

Overview

AT97SC3204-X2MA-20 from Atmel is a Trusted Platform Module (TPM) IC compliant with TCG TPM 1.2 and PC Client TIS 1.2 specifications, featuring an AVR RISC microprocessor, hardware RSA crypto engine (2048-bit signature in 200ms), FIPS 140-2–compliant RNG, and 1756-byte NV user storage. It interfaces via 33MHz LPC bus with SIRQ and CLKRUN support for power-managed PCs.

For engineers reviewing the AT97SC3204-X2MA-20 datasheet, AT97SC3204-X2MA-20 pinout, AT97SC3204-X2MA-20 application, or AT97SC3204-X2MA-20 equivalent, key selection criteria include LPC interface timing compliance, industrial temperature range (-40°C to +85°C), 40-pin QFN package, secure key storage in internal EEPROM, and hardware-accelerated SHA-1 (20μs/64-byte block).

Technical Context

The AT97SC3204-X2MA-20 implements a full TCG TPM 1.2 stack in silicon, integrating an 8-bit AVR CPU, dedicated cryptographic accelerator for RSA and SHA-1, and physical security circuitry. Its LPC interface supports LFRAME#, LAD[3:0], LCLK, and SERIRQ with CLKRUN# clock gating for mobile platform power savings.

Internal architecture includes SRAM for runtime operations, EEPROM for persistent RSA keys and 1756 bytes of user-defined NV storage, and a FIPS 140-2–validated RNG used for both key generation and system-level random number supply. Firmware is factory-integrated, enabling turnkey deployment without host-side crypto stack implementation.

Key Specifications

Pinout & Package

AT97SC3204-X2MA-20 is packaged in a 40-pad QFN (6.0 mm × 6.0 mm, 0.50 mm pitch), RoHS-compliant and lead-free. Pinout matches the 40ML1 variant defined in Atmel-5295ES.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9665TT2.0 and NPCT650KB0DX, the AT97SC3204-X2MA-20 uniquely combines industrial temperature operation, 1756-byte user NV space, and factory-integrated TPM 1.2 firmware - making it optimal for legacy-secure industrial and medical systems where TPM 2.0 migration is not yet feasible.

Availability

AT97SC3204-X2MA-20 is available at Aetrix Electronics and suitable for enterprise desktop security, industrial embedded control, medical imaging workstations, and network appliance authentication requiring stable component supply and long-term industrial temperature qualification.

Supply support for AT97SC3204-X2MA-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

Atmel Corporation, now part of Microchip Technology, designs secure microcontrollers and trusted computing solutions for industrial, automotive, and enterprise applications.

The AT97SC3204 product line delivers certified TPM 1.2 modules targeting PC OEMs and embedded system integrators needing hardware-rooted security without firmware development overhead.

FAQ

What is the primary compliance standard met by the AT97SC3204-X2MA-20?

The AT97SC3204-X2MA-20 is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) version 1.2 specification and the TCG PC Client-specific TPM Interface Specification (TIS) version 1.2. This dual compliance ensures interoperability with Windows BitLocker, Linux tpm-tools, and legacy BIOS implementations requiring TPM 1.2–based attestation and key sealing. The AT97SC3204-X2MA-20 does not support TPM 2.0 features such as ECC or hierarchical authorization.

Does the AT97SC3204-X2MA-20 support industrial temperature operation?

Yes, the AT97SC3204-X2MA-20 is rated for industrial temperature operation from -40°C to +85°C, as confirmed in the Atmel ordering information and package documentation. This makes the AT97SC3204-X2MA-20 suitable for deployment in ruggedized PCs, factory-floor controllers, and medical equipment where ambient thermal conditions exceed commercial-grade limits. The X2MA-20 suffix specifically denotes the industrial temperature grade.

What package type is used for the AT97SC3204-X2MA-20?

The AT97SC3204-X2MA-20 uses a 40-pad Very-thin Quad Flat No Lead (VQFN) package, designated 40ML1, with 6.0 mm × 6.0 mm body size and 0.50 mm pitch. This RoHS-compliant, lead-free QFN package provides high-density mounting and thermal performance suitable for compact motherboard layouts. It is distinct from the 28-pin thin TSSOP variants also offered in the AT97SC3204 family.

How does the AT97SC3204-X2MA-20 handle cryptographic key storage?

The AT97SC3204-X2MA-20 stores RSA keys and other sensitive data in internal EEPROM with hardware-enforced write protection and tamper resistance. It provides 1756 bytes of user-defined NV storage accessible via TCG commands, in addition to standard TPM index space. Keys never leave the die in plaintext, and the AT97SC3204-X2MA-20's physical security circuitry actively detects and responds to environmental attacks such as voltage glitching or probe attempts.

What is the role of the CLKRUN# pin on the AT97SC3204-X2MA-20?

The CLKRUN# pin on the AT97SC3204-X2MA-20 enables dynamic clock gating for power savings in mobile platforms. When asserted, it signals the southbridge to stop the LPC clock during idle periods while preserving TPM state in SB3V-powered retention memory. This feature is essential for achieving ACPI S3/S4 suspend/resume compliance and extends battery life in laptops and tablets without compromising TPM functionality or security guarantees. The AT97SC3204-X2MA-20 relies on CLKRUN# to meet Intel's mobile platform power requirements.