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

Microchip Technology AT97SC3205T-X3A1C10B

Name: AT97SC3205T-X3A1C10B
Brand: Microchip Technology
SKU: AT97SC3205T-X3A1C10B
Price: 2.40 USD
Availability: InStock
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Part No.:: AT97SC3205T-X3A1C10B

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

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

Datasheet:: AT97SC3205T-X3A1C10B.pdf

Description:: FF COM I2C TPM 4.4MM TSSOP UEK

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Product details

Overview

AT97SC3205T-X3A1C10B from Microchip Technology (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring an AVR® RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066 bytes of user NV storage. It operates at 3.3V with I²C interface up to 400 kHz and targets secure boot and platform authentication in industrial embedded systems.

For engineers reviewing the AT97SC3205T-X3A1C10B datasheet, AT97SC3205T-X3A1C10B pinout, AT97SC3205T-X3A1C10B application, or AT97SC3205T-X3A1C10B equivalent, key selection considerations include I²C timing compliance, GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, low-power deep-sleep recovery via TWI_Wakeup#, and dual-package support (28-pin TSSOP / 32-pad QFN) for layout flexibility in space-constrained designs.

Technical Context

The AT97SC3205T-X3A1C10B integrates a dedicated AVR 8-bit RISC CPU with on-chip EEPROM for RSA key storage and SRAM for runtime operations. Its crypto subsystem includes FIPS-140-2 validated hardware engines for HMAC, AES-128, SHA-1, and RSA-2048 key generation and signing.

Communication occurs exclusively over a two-wire I²C interface supporting Standard Mode (100 kHz) and Fast Mode (400 kHz), with SM_DAT and SM_CLK requiring external pull-ups (800 Ω and 1.5 kΩ respectively for reliable 400 kHz operation). The device enters automatic low-power sleep when idle and recovers only upon simultaneous active-low assertion of both TWI_Wakeup# pins.

Key Specifications

Parameter	Value and Actual Design Meaning
TCG Compliance	TPM 1.2 specification fully implemented - enables standardized platform integrity attestation and sealed storage.
I²C Interface Speed	Up to 400 kHz Fast Mode - requires precise 800 Ω pull-up on SM_DAT and 1.5 kΩ on SM_CLK for stable high-speed communication.
Supply Voltage	3.3 V ±10% - mandates tight decoupling: 2200–4700 pF caps <5 mm from each VCC–GND pair plus 0.1 µF at VCC node.
NV Storage Capacity	2066 bytes user-defined data - allocated in TPM NV indices, accessible via TCG commands like TPM_NV_Write/Read.
Crypto Certification	FIPS-140-2 Level 2 certified - covers RNG, HMAC, AES, SHA, and RSA engines; validates cryptographic integrity for government and enterprise use.
Operating Temperature	−40°C to +85°C - qualified for industrial environments; supports extended thermal cycling without firmware or key corruption.
Package Options	28-pin Thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) or 32-pad QFN (4.0 × 4.0 mm, 0.40 mm pitch) - both RoHS-compliant and lead-free.

Pinout & Package

AT97SC3205T-X3A1C10B is offered in two package variants: 28-pin Thin TSSOP (28X1) and 32-pad Very Thin QFN (32M3), both with exposed thermal pads tied internally to GND (QFN center pad). Pin functions are identical across packages; NC pins may be left floating or tied to VCC/GND per design needs.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	3.3 V main rail; requires localized decoupling (2200–4700 pF <5 mm to adjacent GND) and bulk 0.1 µF cap <10 mm from node.
LRESET#	Active-low reset	Pulsing low ≥2 µs resets internal state; must remain asserted until VCC stabilizes at power-up.
SM_DAT / SM_CLK	I²C bidirectional data/clock	Interface to host controller; 400 kHz operation demands matched pull-ups (800 Ω / 1.5 kΩ) and near-50% duty cycle on SM_CLK.
GPIO-Express-00	Dedicated NV-mapped GPIO	Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up; leave floating if unused; used for XOR chain output in test mode.
PP/GPIO	Physical presence indicator	Hardware-level physical presence signal (active-high); internal pull-down; floating = default input mode.
TWI_Wakeup#	Deep-sleep recovery trigger	Two independent pins (e.g., TSSOP pins 7 & 22); both must be pulsed low simultaneously to exit TPM_DeepSleep state.

Key Features

Feature	Design Value
Single-chip TPM 1.2 solution	Integrates AVR CPU, crypto engines, EEPROM, RNG, and I²C interface in one die - eliminates external co-processors and reduces BOM count.
FIPS-140-2 Level 2 certification	Covers full crypto stack (RNG, AES, SHA, RSA, HMAC) - satisfies U.S. federal and enterprise security policy requirements without additional validation effort.
Hardware-based RNG	FIPS-certified pseudo-RNG fed by analog entropy source - provides cryptographically secure random numbers for key generation and protocol nonces.
Dynamic key cache management	Automatically handles RSA key loading/unloading via TPM_FlushSpecific/TPM_LoadKey2 - no host software intervention required for key lifecycle.
Low-power deep-sleep mode	Enters automatic sleep when idle; recovers only on dual TWI_Wakeup# assertion - prevents accidental wakeups and extends system standby time.

Applications

Secure Boot Authentication	Platform Integrity Attestation
Use Scenario: Verifying firmware signature and measurement registers (PCRs) during BIOS/UEFI boot sequence before loading OS kernel. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust; performs SHA-1 hashing of boot components and signs PCR values using stored RSA keys. Use Value: Prevents unauthorized firmware modification by binding execution to cryptographically verified measurements - enforced at hardware level with tamper-resistant storage.	Use Scenario: Remote verification of endpoint health by cloud service, e.g., validating that a factory HMI has unmodified firmware and unaltered configuration. IC Role / Device Role / Timing Role: TPM 1.2 attestation engine; generates quote signatures over PCR values and reports them via I²C to host MCU for network transmission. Use Value: Enables zero-trust architecture by providing verifiable, hardware-backed evidence of system state - critical for IIoT device onboarding and compliance audits.
Sealed Storage for Credentials	Hardware Physical Presence Control
Use Scenario: Storing encrypted Wi-Fi credentials, TLS private keys, or API tokens in NV memory, accessible only after successful platform authentication. IC Role / Device Role / Timing Role: Secure NV storage controller; uses AES encryption keyed by PCR-bound authorization policies to protect 2066 bytes of user data. Use Value: Eliminates need for external secure elements or software-based key vaults - keys never leave TPM boundary and are inaccessible without proper PCR context.	Use Scenario: Enabling privileged TPM operations (e.g., clearing owner authorization or disabling TPM) only when physical button is pressed on industrial gateway. IC Role / Device Role / Timing Role: Hardware-enforced physical presence gate; PP/GPIO pin asserts high when mechanical switch closes, satisfying TCG requirement for admin actions. Use Value: Prevents remote privilege escalation attacks by requiring local human intervention - meets TCG 1.2 mandatory physical presence policy for sensitive commands.

Secure Boot Authentication

Platform Integrity Attestation

Use Scenario: Verifying firmware signature and measurement registers (PCRs) during BIOS/UEFI boot sequence before loading OS kernel.

IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust; performs SHA-1 hashing of boot components and signs PCR values using stored RSA keys.

Use Value: Prevents unauthorized firmware modification by binding execution to cryptographically verified measurements - enforced at hardware level with tamper-resistant storage.

Use Scenario: Remote verification of endpoint health by cloud service, e.g., validating that a factory HMI has unmodified firmware and unaltered configuration.

IC Role / Device Role / Timing Role: TPM 1.2 attestation engine; generates quote signatures over PCR values and reports them via I²C to host MCU for network transmission.

Use Value: Enables zero-trust architecture by providing verifiable, hardware-backed evidence of system state - critical for IIoT device onboarding and compliance audits.

Sealed Storage for Credentials

Hardware Physical Presence Control

Use Scenario: Storing encrypted Wi-Fi credentials, TLS private keys, or API tokens in NV memory, accessible only after successful platform authentication.

IC Role / Device Role / Timing Role: Secure NV storage controller; uses AES encryption keyed by PCR-bound authorization policies to protect 2066 bytes of user data.

Use Value: Eliminates need for external secure elements or software-based key vaults - keys never leave TPM boundary and are inaccessible without proper PCR context.

Use Scenario: Enabling privileged TPM operations (e.g., clearing owner authorization or disabling TPM) only when physical button is pressed on industrial gateway.

IC Role / Device Role / Timing Role: Hardware-enforced physical presence gate; PP/GPIO pin asserts high when mechanical switch closes, satisfying TCG requirement for admin actions.

Use Value: Prevents remote privilege escalation attacks by requiring local human intervention - meets TCG 1.2 mandatory physical presence policy for sensitive commands.

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 and LPC interface; larger 32-pin QFN (6 × 6 mm); no AVR core - uses proprietary secure processor.	Enables migration to TPM 2.0 features (algorithm agility, hierarchical key structure); incompatible with legacy TPM 1.2-only hosts.	Select when upgrading to TPM 2.0 is planned and LPC interface is available; not drop-in compatible due to protocol and pinout differences.
Nuvoton NPCT750KB0GX	TPM 1.2 compliant; supports both I²C and SPI; 32-pin QFN (5 × 5 mm); integrated voltage supervisor and watchdog.	Offers dual-interface flexibility and enhanced system monitoring; lacks GPIO-Express-00 mapping and FIPS-140-2 Level 2 certification for full crypto stack.	Select when SPI interface or built-in supervision is required; verify FIPS validation scope matches your compliance mandate before deployment.

Compared with Infineon SLB9665TT2.0 and Nuvoton NPCT750KB0GX, the AT97SC3205T-X3A1C10B delivers verified TPM 1.2 functionality with AVR-based programmability, GPIO-Express-00 for indexed NV access, and full FIPS-140-2 Level 2 coverage - making it optimal for cost-sensitive industrial designs requiring strict backward compatibility and certified crypto assurance.

Availability

AT97SC3205T-X3A1C10B is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostics interfaces, and secure IoT gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT97SC3205T-X3A1C10B 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 its trusted computing portfolio. The company specializes in microcontrollers, analog, and security ICs for industrial, automotive, and communications markets.

The AT97SC3205T-X3A1C10B belongs to Atmel's TPM product line, designed specifically to deliver certified, single-chip Trusted Platform Module functionality for embedded systems needing hardware-rooted security without external crypto co-processors.

FAQ

What is the primary security certification applicable to the AT97SC3205T-X3A1C10B?

The AT97SC3205T-X3A1C10B holds FIPS-140-2 Level 2 certification covering its hardware random number generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This certification validates the implementation integrity and operational security of those modules under defined physical and logical attack conditions, enabling compliance with U.S. federal and enterprise security policies. The AT97SC3205T-X3A1C10B achieves this through on-die entropy sources, tamper-evident design, and secure key handling - all documented in the official FIPS certificate issued to Atmel.

Does the AT97SC3205T-X3A1C10B support both TSSOP and QFN packages, and are pin functions identical?

Yes, the AT97SC3205T-X3A1C10B is manufactured in both 28-pin Thin TSSOP (28X1) and 32-pad QFN (32M3) packages, and all functional pins - including SM_DAT, SM_CLK, GPIO-Express-00, PP/GPIO, and TWI_Wakeup# - retain identical circuit roles and electrical behavior across both variants. The QFN includes an exposed thermal pad tied internally to GND, while the TSSOP has additional NC pins (e.g., pins 5, 12–15, 27–28) that may be left floating or tied to VCC/GND. The AT97SC3205T-X3A1C10B datasheet confirms full functional equivalence between packages.

How does the AT97SC3205T-X3A1C10B handle low-power operation and wake-up recovery?

The AT97SC3205T-X3A1C10B automatically enters low-power sleep when idle and supports deep-sleep mode via the TPM_DeepSleep command. Recovery requires simultaneous active-low pulses on both TWI_Wakeup# pins - a deliberate dual-signal mechanism preventing spurious wake-ups. Unlike standard I²C wake-up, this design enforces hardware-level coordination, ensuring the TPM resumes only when explicitly triggered by the host system. This behavior is intrinsic to the AT97SC3205T-X3A1C10B and documented in Atmel's TPM-specific command reference guide.

What is the role of GPIO-Express-00 in the AT97SC3205T-X3A1C10B, and how is it configured?

GPIO-Express-00 in the AT97SC3205T-X3A1C10B is a dedicated general-purpose I/O pin hardwired to TPM_NV_INDEX_GPIO_00, enabling direct NV storage access for user-defined states or flags. It features an internal pull-up resistor and defaults to input mode; if unused, it must be left floating (not tied) to avoid conflict with XOR chain output during I/O test mode. Its fixed NV index mapping simplifies firmware integration for persistent GPIO state retention - a capability unique to the AT97SC3205T-X3A1C10B among Atmel's TPM offerings.

Can the AT97SC3205T-X3A1C10B be used in automotive applications?

No, the AT97SC3205T-X3A1C10B is not qualified for automotive applications. Atmel's official documentation explicitly states that its products - unless specifically designated as automotive-grade - are not intended, authorized, or warranted for use in automotive systems. The AT97SC3205T-X3A1C10B is rated for industrial temperature range (−40°C to +85°C) but lacks AEC-Q100 qualification, automotive-specific failure mode analysis, or extended reliability testing required for vehicle ECUs. For automotive TPM use, consult Microchip's automotive-qualified alternatives.

AT97SC3205T-X3A1C10B Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Packaging:: Tube

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-X3A1C10B FAQ

1.How can I place an order for AT97SC3205T-X3A1C10B through Aetrix?

Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A1C10B 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-X3A1C10B reliable?

The price and inventory of AT97SC3205T-X3A1C10B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A1C10B is usually 5 days.

3.What payment methods are accepted for AT97SC3205T-X3A1C10B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A1C10B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT97SC3205T-X3A1C10B?

AT97SC3205T-X3A1C10B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT97SC3205T-X3A1C10B 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-X3A1C10B?

For technical support, including AT97SC3205T-X3A1C10B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A1C10B requirements.

6.How does Aetrix verify that AT97SC3205T-X3A1C10B is sourced from the original manufacturer or authorized distributors?

All AT97SC3205T-X3A1C10B 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-X3A1C10B meets industry standards.

7.What is the process for return or replacement of AT97SC3205T-X3A1C10B?

All AT97SC3205T-X3A1C10B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A1C10B, 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-X3A1C10B part is unused and in its original packaging.

Return procedure for AT97SC3205T-X3A1C10B:

1.Submit a request within 90 days.

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

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