Microchip Technology AT97SC3205T-X3A14-10

Overview

AT97SC3205T-X3A14-10 from Atmel is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware RSA crypto engine, FIPS-140-2 certified RNG/AES/SHA/HMAC engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface (400kHz Fast Mode) and targets secure boot, platform integrity verification, and key management in embedded computing systems.

For engineers reviewing the AT97SC3205T-X3A14-10 datasheet, AT97SC3205T-X3A14-10 pinout, AT97SC3205T-X3A14-10 application, or AT97SC3205T-X3A14-10 equivalent, this page delivers verified package mapping (28-pin Thin TSSOP), confirmed I²C timing constraints, validated GPIO-Express-00 and PP/GPIO roles, FIPS-140-2 module certification scope, and low-power sleep recovery via TWI_Wakeup# signaling.

Technical Context

The AT97SC3205T-X3A14-10 implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, cryptographic acceleration, and secure non-volatile key storage in internal EEPROM. Its AVR core executes firmware implementing TPM state machine logic and handles I²C protocol framing without host CPU intervention.

Security architecture includes physical tamper detection circuitry, dynamic memory management for RSA keys, and hardware-enforced isolation between crypto operations and firmware execution. The device supports deep-sleep mode entered via TPM_DeepSleep command and recovered only by simultaneous low pulses on TWI_Wakeup# pins (TSSOP Pin 7 & Pin 22).

Key Specifications

Pinout & Package

AT97SC3205T-X3A14-10 is packaged in a 28-pin Thin TSSOP (4.4 mm × 9.7 mm body, 0.65 mm pitch) with exposed pad absent. Pin functions are validated per Atmel-8883AS datasheet summary, including dual-purpose pins (e.g., TestBI/GPIO/XTAMPER) and dedicated security signals (PP/GPIO, TWI_Wakeup#).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SLB9665TT2.0 and NPCT750KB0GX, the AT97SC3205T-X3A14-10 provides I²C-native integration with dual TWI_Wakeup# pins enabling deterministic deep-sleep recovery, industrial temperature support, and explicit PP/GPIO for admin-controlled command authorization-critical for infrastructure-grade deployments.

Availability

AT97SC3205T-X3A14-10 is available at Aetrix Electronics and suitable for server platform integrity, industrial control authentication, embedded device identity, and network edge gateway security requiring stable component supply and long-term lifecycle assurance.

Supply support for AT97SC3205T-X3A14-10 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, designed high-reliability microcontrollers, security ICs, and touch solutions for industrial, automotive, and IoT markets before its 2016 acquisition.

The AT97SC3205T-X3A14-10 belongs to Atmel's TPM security IC product line, engineered specifically to deliver certified, single-chip trusted execution environments for embedded platforms requiring hardware-rooted trust anchors.

FAQ

What is the primary interface protocol supported by the AT97SC3205T-X3A14-10?

The AT97SC3205T-X3A14-10 supports only the I²C interface, operating at 400kHz Fast Mode or 100kHz Standard Mode. It does not support SPI, UART, or LPC interfaces. Pull-up resistor values (800Ω on SM_DAT, 1.5kΩ on SM_CLK) are critical for reliable 400kHz operation, and clock duty cycle should approach 50% to maximize communication stability. The AT97SC3205T-X3A14-10 uses standard I²C addressing per TCG specification.

Does the AT97SC3205T-X3A14-10 include FIPS-140-2 certification, and what modules are covered?

Yes, the AT97SC3205T-X3A14-10 is FIPS-140-2 Level 2 certified, covering its hardware Random Number Generator (RNG), HMAC, AES, SHA-1, and RSA cryptographic engines. Certification applies to the complete module-not just individual algorithms-and includes physical security mechanisms like tamper detection. The AT97SC3205T-X3A14-10 certification documentation is maintained by Atmel (now Microchip) and referenced in the official FIPS validation list under certificate #1627.

How is deep-sleep mode exited on the AT97SC3205T-X3A14-10, and what pins are involved?

Deep-sleep mode on the AT97SC3205T-X3A14-10 is exited exclusively via the TPM_DeepSleep command followed by simultaneous low pulses on both TWI_Wakeup# pins-TSSOP Pin 7 and Pin 22. Neither pin alone can trigger wake-up; both must be driven low within timing tolerance. If unused, Pin 7 may float or tie to GND; Pin 22 must be tied to GND or VCC. This dual-pin requirement prevents accidental wake events.

What is the function of the PP/GPIO pin on the AT97SC3205T-X3A14-10, and how is it configured by default?

The PP/GPIO pin on the AT97SC3205T-X3A14-10 serves as the Hardware Physical Presence indicator-active-high signal used to authorize privileged TPM commands such as ClearOwner or DictionaryAttackLockReset. By default, it is configured as a GPIO input with internal pull-down. When unused, it must be left floating (due to internal pull-down); tying it high permanently enables physical presence, removing admin control over sensitive operations.

Can the AT97SC3205T-X3A14-10 store custom keys or certificates, and how much space is available?

Yes, the AT97SC3205T-X3A14-10 provides 2066 bytes of user-defined non-volatile storage accessible via TCG-defined NV commands. This space is separate from internal RSA key storage and supports OEM-specific keys, X.509 certificates, or policy blobs. Writes require authorization (e.g., password or PCR binding), and access permissions are enforced by TPM firmware. The AT97SC3205T-X3A14-10 does not expose raw EEPROM access-only authenticated NV operations per TCG spec.