Microchip Technology AT97SC3205T-H3M4610B

Overview

AT97SC3205T-H3M4610B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400kHz and supports industrial temperature range (−40°C to +85°C). Used in server motherboards and embedded systems requiring secure boot and key attestation.

For engineers reviewing the AT97SC3205T-H3M4610B datasheet, AT97SC3205T-H3M4610B pinout, AT97SC3205T-H3M4610B application, or AT97SC3205T-H3M4610B equivalent, this page delivers verified package mapping (32-pad QFN), confirmed I²C timing constraints, validated GPIO-Express-00 and PP/GPIO roles, FIPS-140-2 module certification scope, and real-world low-power sleep recovery behavior via TWI_Wakeup#.

Technical Context

The AT97SC3205T-H3M4610B implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, cryptographic acceleration, and secure non-volatile key storage. Its internal architecture integrates an 8-bit AVR CPU with dedicated crypto co-processors for RSA key generation (up to 2048-bit), SHA-1 hashing, HMAC authentication, and AES encryption - all operating under FIPS-140-2 Level 2 validation.

Communication occurs exclusively over a two-wire I²C interface (SM_DAT/SM_CLK) supporting both Standard Mode (100kHz) and Fast Mode (400kHz), with strict timing requirements on clock duty cycle and pull-up resistor values (1.5kΩ on SM_CLK, 800Ω on SM_DAT) to ensure reliable high-speed operation. The device enters autonomous low-power sleep upon idle and recovers only upon dual active-low assertion of TWI_Wakeup# pins.

Key Specifications

Pinout & Package

AT97SC3205T-H3M4610B uses the 32-pad QFN (32M3) package: 4.0×4.0 mm body, 0.40 mm pitch, exposed thermal pad tied to GND. Pinout validated per Atmel-8883AS datasheet summary Figure 1-1 and Table 1-2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9665TT2.0 and NPCT750KB0GX, the AT97SC3205T-H3M4610B uniquely delivers FIPS-140-2 Level 2 certification coverage across RNG, AES, SHA, HMAC, and RSA - enabling regulatory acceptance in government and healthcare deployments where certification traceability is mandatory.

Availability

AT97SC3205T-H3M4610B is available at Aetrix Electronics and suitable for server platform integrity, industrial control secure boot, secure IoT gateway identity, and medical device data provenance requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT97SC3205T-H3M4610B 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 qualification for legacy Atmel security ICs including the AT97SC3205T series.

The AT97SC3205T belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems needing hardware-rooted trust without external co-processors or discrete crypto components.

FAQ

What is the exact package type and footprint for AT97SC3205T-H3M4610B?

The AT97SC3205T-H3M4610B uses the 32-pad QFN (32M3) package: 4.0 mm × 4.0 mm body, 0.40 mm pitch, and an exposed thermal pad internally connected to GND. This matches the mechanical drawing in Atmel-8883AS datasheet section 4.2 and is distinct from the 28-pin TSSOP variant. PCB layout must accommodate the thermal pad connection to ground plane for thermal and electrical performance.

Does AT97SC3205T-H3M4610B support TPM 2.0 commands or is it strictly TPM 1.2?

The AT97SC3205T-H3M4610B implements only the Trusted Computing Group TPM 1.2 specification, as confirmed in its official summary datasheet. It does not support TPM 2.0 commands, algorithms (e.g., SHA-256, ECC), or structures. Systems requiring TPM 2.0 must use a different part such as Infineon SLB9665TT2.0 - the AT97SC3205T-H3M4610B remains fully compatible with legacy TPM 1.2 firmware stacks and OS drivers.

How is low-power sleep managed on AT97SC3205T-H3M4610B, and what is required to wake it?

The AT97SC3205T-H3M4610B enters low-power sleep autonomously when idle. Recovery requires simultaneous active-low pulses on both TWI_Wakeup# pins (pins 7 and 22 per QFN pinout). Pin 22 must be tied to GND or VCC (not left floating), while pin 7 may float or tie to GND. This dual-signal requirement prevents spurious wake events and ensures deterministic sleep exit - a design feature documented in Atmel-8883AS section 1.2.

What FIPS-140-2 validation scope applies to AT97SC3205T-H3M4610B?

The AT97SC3205T-H3M4610B is FIPS-140-2 Level 2 certified, covering its hardware random number generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This certification applies to the complete module - not just individual blocks - and includes physical security features like tamper-evident design and secure key storage. The certification documentation is referenced in the Atmel-8883AS datasheet summary but requires NDA access for full validation reports.

Can AT97SC3205T-H3M4610B store user data, and how is it accessed?

Yes, the AT97SC3205T-H3M4610B provides 2066 bytes of non-volatile user storage accessible via standard TCG TPM 1.2 commands (e.g., TPM_NV_DefineSpace, TPM_NV_Write, TPM_NV_Read). This space is logically separate from internal RSA key storage and protected by authorization policies (e.g., owner password or locality). Access requires proper TPM session setup and authorization - it is not memory-mapped or directly readable by the host processor.