Microchip Technology AT97SC3205-G3M4200B

Overview

AT97SC3205-G3M4200B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based cryptographic key generation, storage, and attestation for PC and embedded platforms. It integrates an AVR RISC CPU, FIPS-140-2 certified RNG, AES/SHA/RSA crypto engines, 2066-byte NV user storage, and operates at 3.3V with SPI interface up to 33MHz.

For engineers reviewing the AT97SC3205-G3M4200B datasheet, AT97SC3205-G3M4200B pinout, AT97SC3205-G3M4200B application, or AT97SC3205-G3M4200B equivalent, this page delivers verified package mapping, SPI-TIS 1.3 interface behavior, GPIO and tamper pin functions, industrial temperature support (-40°C to +85°C), and direct OEM integration guidance per TCG PC Client specifications.

Technical Context

The AT97SC3205-G3M4200B implements the full TPM 1.2 stack in silicon, including dynamic internal RSA key cache management without host intervention beyond standard TCG commands (TPM_FlushSpecific, TPM_LoadKey2). Its hardware RNG feeds both key generation and system-level random number requests.

It uses a dedicated SPI interface compliant with TCG PC Client-Specific TPM Interface Specification (TIS) v1.3, supporting active-low PIRQ# interrupt signaling and SPI_RST# reset synchronization with system power-on reset. The device enters low-power mode automatically during idle periods without software control.

Key Specifications

Pinout & Package

AT97SC3205-G3M4200B is supplied in a 32-pad Very Thin QFN (VQFN) package (Atmel code 32M3), 4.0 × 4.0 × 0.9 mm body, 0.4 mm lead pitch, with exposed thermal pad tied internally to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TPM 1.2 security module applications.

Compared with SLB9665 TT 1.2 and NPCT750YAXX, the AT97SC3205-G3M4200B uniquely combines GPIO Express-00 pin mapping, integrated XTamper detection, and AVR-based firmware extensibility-making it optimal for custom-secured embedded systems requiring field-programmable GPIO behavior and physical intrusion response.

Availability

AT97SC3205-G3M4200B is available at Aetrix Electronics and suitable for desktop security, server platform integrity, and industrial control systems requiring stable component supply, long lifecycle assurance, and traceable sourcing for security-critical designs.

Supply support for AT97SC3205-G3M4200B 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 full product support, documentation, and manufacturing continuity for the AT97SC3205 family.

The AT97SC3205 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, turnkey hardware security for PC clients and embedded systems requiring TCG-compliant root-of-trust functionality.

FAQ

What is the primary compliance standard met by the AT97SC3205-G3M4200B?

The AT97SC3205-G3M4200B 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 1.3. It also holds FIPS-140-2 certification covering its RNG, HMAC, AES, SHA, and RSA crypto engines - confirming its suitability for government and enterprise security deployments requiring validated cryptographic modules.

Does the AT97SC3205-G3M4200B support tamper detection?

Yes, the AT97SC3205-G3M4200B supports tamper detection via the TestBI/GPIO/XTamper pin, which functions as an active-high external tamper input. When asserted, it triggers immediate zeroization of sensitive cryptographic keys stored in internal EEPROM. This feature is documented in Atmel's "AT97SC3205 Specific TPM Commands Reference Guide" and is enabled in secure OEM configurations.

What SPI clock frequency does the AT97SC3205-G3M4200B support in production systems?

The AT97SC3205-G3M4200B supports SPI operation up to 45 MHz, but the typical operating range specified for PC platforms is 24 MHz to 33 MHz. For reliable TCG-compliant integration, designs should target 33 MHz maximum - matching the timing requirements of standard BIOS implementations and ensuring robust signal integrity on motherboard traces.

How is the AT97SC3205-G3M4200B powered and what decoupling is required?

The AT97SC3205-G3M4200B operates from a single 3.3 V ±10% supply. Per Atmel's design guidance, each VCC pin requires a dedicated 2200–4700 pF ceramic decoupling capacitor placed within 5 mm of the pin and adjacent GND. A shared 0.1 µF X5R/X7R capacitor must be located within 10 mm of the chip at the VCC node junction - all capacitors must be high-quality dielectric types to ensure stable operation across temperature and lifetime.

What is the function of the PP/GPIO pin on the AT97SC3205-G3M4200B?

The PP/GPIO pin on the AT97SC3205-G3M4200B serves as the Hardware Physical Presence indicator - an active-high input used to authorize privileged TPM operations such as clearing platform configuration or disabling the TPM. It has an internal pull-down resistor and defaults to GPIO input mode; unused, it should be left floating per Atmel's pin description guidelines.