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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Microchip Technology AT97SC3205T-X3A1C-10

Name: AT97SC3205T-X3A1C-10
Brand: Microchip Technology
SKU: AT97SC3205T-X3A1C-10
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT97SC3205T-X3A1C-10

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

Package:: 28-TSSOP (0.173", 4.40mm Width)

Datasheet:: AT97SC3205T-X3A1C-10.pdf

Description:: FF COM I2C TPM 4.4MM TSSOP UEK

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Product details

Overview

AT97SC3205T-X3A1C-10 from Microchip Technology (acquired Atmel in 2016) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring an integrated 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 and supports industrial temperature range (−40°C to +85°C) in 32-pad QFN package.

For engineers reviewing the AT97SC3205T-X3A1C-10 datasheet, AT97SC3205T-X3A1C-10 pinout, AT97SC3205T-X3A1C-10 application, or AT97SC3205T-X3A1C-10 equivalent, key selection considerations include I²C timing compliance (400 kHz Fast Mode), GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, TWI_Wakeup# dual-pin low-power recovery, physical presence (PP/GPIO) support, and FIPS-140-2 certification scope covering RNG, HMAC, AES, SHA, and RSA.

Technical Context

The AT97SC3205T-X3A1C-10 implements the full TCG TPM 1.2 stack in hardware, with dedicated crypto accelerators for RSA key generation and signing, SHA-1 hashing, and AES encryption. Its internal EEPROM stores RSA keys and 2066 bytes of user-defined NV data, managed via TCG commands including TPM_FlushSpecific and TPM_LoadKey2.

It uses a dynamic internal memory management scheme for key caching and supports low-power sleep mode entered automatically during idle periods, recoverable only via simultaneous active-low pulses on both TWI_Wakeup# pins. The device integrates a FIPS-140-2 certified hardware random number generator used for cryptographic key derivation and protocol randomness.

Key Specifications

Parameter	Value and Actual Design Meaning
TCG Compliance	TPM 1.2 specification fully implemented per TCG Main Specification Parts 1–3
I²C Interface	400 kHz Fast Mode / 100 kHz Standard Mode; SM_DAT and SM_CLK require specific pull-up values (800 Ω and 1.5 kΩ respectively) for stable high-speed operation
Crypto Engines	FIPS-140-2 certified RNG, HMAC, AES, SHA, and RSA engines - validated for cryptographic integrity and entropy quality
NV Storage	2066 bytes of user-defined non-volatile storage accessible via TPM_NV_DefineSpace and TPM_NV_Write commands
Supply Voltage	3.3 V ±10%; requires decoupling capacitors: 2200–4700 pF near each VCC pin (<5 mm to adjacent GND) and 0.1 µF at VCC node (<10 mm)
Operating Temp	Industrial range: −40°C to +85°C - validated for extended thermal stability in embedded control and server platforms
Package	32-pad QFN (32M3), 4.0 × 4.0 × 0.90 mm body, 0.40 mm pitch, exposed thermal pad tied to GND

Pinout & Package

AT97SC3205T-X3A1C-10 is supplied in a 32-pad Very Thin QFN (32M3) package with 0.40 mm pitch and an exposed center thermal pad internally connected to GND. Pin assignment follows the QFN variant described in Table 1-1 and Figure 1-1 of the summary datasheet.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	3.3 V main supply; requires localized decoupling (2200–4700 pF) and system-level 0.1 µF bypass within 10 mm
GND	Ground reference	System ground; substrate center pad is internally tied to GND and must be connected externally for thermal and EMI performance
SM_DAT / SM_CLK	I²C bidirectional data / clock	Interface to host controller; 400 kHz operation demands precise pull-up sizing (800 Ω / 1.5 kΩ) and 50% duty cycle on SM_CLK
PP/GPIO	Hardware physical presence indicator	Active-high signal indicating authorized physical access; internal pull-down; floats if unused
GPIO-Express-00	Pre-mapped NV index I/O	Directly assigned to TPM_NV_INDEX_GPIO_00; internal pull-up; serves as XOR chain output in test mode
TWI_Wakeup# (Pins 7 & 22)	Low-power recovery trigger	Both pins must be pulsed low simultaneously to exit deep sleep (TPM_DeepSleep command); pin 22 must be tied to GND or VCC
PIRQ#	SPI interrupt request	Asserted by TPM to signal host interrupt condition; must be pulled low if unused
ATest (Pins 19, 21, 24)	Manufacturing test interface	Unused in field operation; must be biased to VCC or GND to reduce noise and power leakage

Key Features

Feature	Design Value
Single-chip TPM 1.2 solution	Integrates AVR CPU, crypto engines, EEPROM, RNG, and secure firmware - eliminates external co-processor or discrete security IC dependencies
FIPS-140-2 certification	Covers RNG entropy quality, HMAC key derivation, AES encryption/decryption, SHA-1 hashing, and RSA key generation/signing - validated for government and enterprise trust requirements
Hardware-based key management	Internal EEPROM stores RSA keys with dynamic cache management; no host software intervention required beyond standard TCG commands
Low-power sleep with dual-wakeup	Automatically enters low-power state when idle; recovery requires coordinated low pulse on two dedicated TWI_Wakeup# pins - prevents accidental wake events
GPIO-Express architecture	GPIO-Express-00 provides deterministic NV-index mapping and test-mode XOR chain output - enables secure, repeatable I/O configuration without runtime redefinition

Applications

Server Platform Security	Industrial Control Authentication
Use Scenario: Secure boot and firmware integrity verification in rack-mounted servers and edge compute nodes. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust module performing SHA-1 hash verification of BIOS/bootloader images and sealing decryption keys to platform state. Use Value: Prevents unauthorized firmware modification by binding cryptographic keys to measured platform configuration registers (PCRs), enforced via hardware-accelerated SHA and RSA engines.	Use Scenario: Secure remote firmware updates and operator authentication in programmable logic controllers (PLCs) and HMIs operating in harsh industrial environments. IC Role / Device Role / Timing Role: Hardware-enforced identity anchor providing tamper-resistant key storage and signed challenge-response authentication using PP/GPIO for physical presence confirmation. Use Value: Enables authenticated firmware update workflows where PP/GPIO activation confirms authorized maintenance access, preventing remote code injection attacks.
Embedded Linux Device Identity	Secure IoT Gateway Boot
Use Scenario: Unique device identity provisioning and TLS certificate anchoring in network-attached storage (NAS) and media gateway devices. IC Role / Device Role / Timing Role: Generates and stores device-specific RSA key pairs in internal EEPROM; signs attestation reports for cloud enrollment via I²C-hosted TPM commands. Use Value: Provides cryptographically verifiable device identity independent of software stack, leveraging FIPS-140-2 certified RNG and RSA signing to resist cloning or impersonation.	Use Scenario: Secure boot chain enforcement in cellular-connected IoT gateways requiring regulatory compliance (e.g., FCC ID, CE marking). IC Role / Device Role / Timing Role: Implements TPM 1.2 PCR extension during bootloader execution and validates signed kernel images before decompression and load. Use Value: Ensures boot integrity across power cycles and firmware updates using hardware-bound measurement logs, with low-power sleep reducing standby current in battery-backed deployments.

Server Platform Security

Industrial Control Authentication

Use Scenario: Secure boot and firmware integrity verification in rack-mounted servers and edge compute nodes.

IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust module performing SHA-1 hash verification of BIOS/bootloader images and sealing decryption keys to platform state.

Use Value: Prevents unauthorized firmware modification by binding cryptographic keys to measured platform configuration registers (PCRs), enforced via hardware-accelerated SHA and RSA engines.

Use Scenario: Secure remote firmware updates and operator authentication in programmable logic controllers (PLCs) and HMIs operating in harsh industrial environments.

IC Role / Device Role / Timing Role: Hardware-enforced identity anchor providing tamper-resistant key storage and signed challenge-response authentication using PP/GPIO for physical presence confirmation.

Use Value: Enables authenticated firmware update workflows where PP/GPIO activation confirms authorized maintenance access, preventing remote code injection attacks.

Embedded Linux Device Identity

Secure IoT Gateway Boot

Use Scenario: Unique device identity provisioning and TLS certificate anchoring in network-attached storage (NAS) and media gateway devices.

IC Role / Device Role / Timing Role: Generates and stores device-specific RSA key pairs in internal EEPROM; signs attestation reports for cloud enrollment via I²C-hosted TPM commands.

Use Value: Provides cryptographically verifiable device identity independent of software stack, leveraging FIPS-140-2 certified RNG and RSA signing to resist cloning or impersonation.

Use Scenario: Secure boot chain enforcement in cellular-connected IoT gateways requiring regulatory compliance (e.g., FCC ID, CE marking).

IC Role / Device Role / Timing Role: Implements TPM 1.2 PCR extension during bootloader execution and validates signed kernel images before decompression and load.

Use Value: Ensures boot integrity across power cycles and firmware updates using hardware-bound measurement logs, with low-power sleep reducing standby current in battery-backed deployments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon SLB9665TT2.0	Supports TPM 2.0 specification; includes ECC acceleration; uses SPI interface instead of I²C; 32-pin QFN but different pinout and voltage (3.3 V vs. 1.8/3.3 V dual)	Required for new designs targeting TPM 2.0 compliance (e.g., Windows 11 readiness); not drop-in compatible due to interface, command set, and pinout differences	Select SLB9665TT2.0 only when upgrading to TPM 2.0 mandates or when ECC-based attestation is required; redesign needed for I²C-to-SPI migration and layout changes.
Nuvoton NPCT750YAXX	TPM 1.2 compliant; supports both I²C and LPC interfaces; includes hardware AES-128 and SHA-256; same 3.3 V supply but rated for commercial temp only (0°C to 70°C)	Limited to commercial temperature range; lacks FIPS-140-2 certification for RNG/AES/SHA/RSA; no PP/GPIO or GPIO-Express-00 functionality	Choose NPCT750YAXX only for cost-sensitive commercial applications where FIPS validation and industrial temp rating are not required; verify absence of physical presence and express GPIO features in design.

Compared with AT97SC3205T-X3A1C-10, SLB9665TT2.0 enables future-proof TPM 2.0 adoption but requires full interface and firmware redesign, while NPCT750YAXX offers lower-cost TPM 1.2 functionality without FIPS certification or industrial temperature support - making AT97SC3205T-X3A1C-10 the sole option meeting all three: FIPS-140-2 validation, −40°C to +85°C operation, and GPIO-Express-00/NV-index integration.

Availability

AT97SC3205T-X3A1C-10 is available at Aetrix Electronics and suitable for server platform security, industrial control authentication, and embedded Linux device identity applications requiring stable component supply and long-term industrial temperature support.

Supply support for AT97SC3205T-X3A1C-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

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 product line delivers certified, single-chip TPM 1.2 modules for embedded systems requiring hardware-rooted trust, FIPS-140-2 validated cryptography, and industrial-grade reliability - targeting server, industrial automation, and secure IoT endpoints.

FAQ

What is the primary compliance standard met by the AT97SC3205T-X3A1C-10?

The AT97SC3205T-X3A1C-10 is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification. It implements the complete TPM 1.2 stack in hardware, including all mandatory commands, PCR architecture, and authorization protocols defined in TCG Main Specification Parts 1–3. This compliance enables interoperability with industry-standard TPM software stacks such as TrouSerS and Microsoft TPM Base Services.

Does the AT97SC3205T-X3A1C-10 support FIPS-140-2 certification, and which components are covered?

Yes, the AT97SC3205T-X3A1C-10 is FIPS-140-2 Level 2 certified. Certification explicitly covers the hardware Random Number Generator (RNG), HMAC engine, AES engine, SHA engine, and RSA engine - validating entropy quality, algorithm correctness, and resistance to physical and logical attacks. The certification applies to the complete module as shipped, including firmware and silicon, and is documented in the official NIST CMVP certificate listing.

What are the critical I²C interface requirements for reliable 400 kHz operation of the AT97SC3205T-X3A1C-10?

For stable 400 kHz Fast Mode I²C operation, the AT97SC3205T-X3A1C-10 requires an 800 Ω pull-up on SM_DAT and a 1.5 kΩ pull-up on SM_CLK. The SM_CLK duty cycle must be as close to 50% as possible - deviations degrade communication stability, especially at maximum speed. Additionally, PCB trace lengths should be minimized and routed away from noisy signals to prevent setup/hold timing violations on the I²C bus.

How does the AT97SC3205T-X3A1C-10 manage low-power states, and what is required to wake it?

The AT97SC3205T-X3A1C-10 automatically enters low-power sleep when idle. Recovery requires simultaneous active-low pulses on both TWI_Wakeup# pins (QFN pins 7 and 22). Pin 22 must be tied to GND or VCC (directly or via 4.7 kΩ); pin 7 may float or tie to GND. This dual-signal requirement prevents spurious wake events and ensures intentional, coordinated host-initiated recovery from deep sleep.

What is the function and configuration of GPIO-Express-00 on the AT97SC3205T-X3A1C-10?

GPIO-Express-00 on the AT97SC3205T-X3A1C-10 is pre-mapped to TPM_NV_INDEX_GPIO_00, enabling direct NV storage access without runtime index definition. It features an internal pull-up resistor and defaults to GPIO input mode. In I/O test mode, it serves as the XOR chain output. When unused, it must be left floating - tying it high or low violates its internal pull-up behavior and may disrupt test-mode functionality or NV indexing.

AT97SC3205T-X3A1C-10 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 28-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Applications:: Trusted Platform Module (TPM)

Core Processor:: AVR

Program Memory Type:: EEPROM

Controller Series:: -

RAM Size:: -

Interface:: I2C

Number of I/O:: 4

Voltage - Supply:: 3.3V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP

AT97SC3205T-X3A1C-10 FAQ

1.How can I place an order for AT97SC3205T-X3A1C-10 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A1C-10 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AT97SC3205T-X3A1C-10 reliable?

The price and inventory of AT97SC3205T-X3A1C-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A1C-10 is usually 5 days.

3.What payment methods are accepted for AT97SC3205T-X3A1C-10?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A1C-10 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT97SC3205T-X3A1C-10?

AT97SC3205T-X3A1C-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT97SC3205T-X3A1C-10 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AT97SC3205T-X3A1C-10?

For technical support, including AT97SC3205T-X3A1C-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A1C-10 requirements.

6.How does Aetrix verify that AT97SC3205T-X3A1C-10 is sourced from the original manufacturer or authorized distributors?

All AT97SC3205T-X3A1C-10 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT97SC3205T-X3A1C-10 meets industry standards.

7.What is the process for return or replacement of AT97SC3205T-X3A1C-10?

All AT97SC3205T-X3A1C-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A1C-10, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AT97SC3205T-X3A1C-10 part is unused and in its original packaging.

Return procedure for AT97SC3205T-X3A1C-10:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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