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

Microchip Technology AT97SC3205-U3A15-10

Name: AT97SC3205-U3A15-10
Brand: Microchip Technology
SKU: AT97SC3205-U3A15-10
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT97SC3205-U3A15-10

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

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

Datasheet:: AT97SC3205-U3A15-10.pdf

Description:: IC CRYPTO TPM 28TSSOP

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Product details

Overview

AT97SC3205-U3A15-10 from Microchip (formerly 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 microprocessor, FIPS-140-2 certified RNG, AES/SHA/RSA engines, 2066-byte NV user storage, and SPI interface up to 45 MHz in a 32-pad QFN package.

For engineers reviewing the AT97SC3205-U3A15-10 datasheet, AT97SC3205-U3A15-10 pinout, AT97SC3205-U3A15-10 application, or AT97SC3205-U3A15-10 equivalent, this page delivers verified technical context, pin-level design meaning, real-world use cases, and validated alternative options for secure boot, platform integrity verification, and firmware authentication in OEM PC and industrial control systems.

Technical Context

The AT97SC3205-U3A15-10 implements the TCG TPM 1.2 specification with full compliance to the PC Client-Specific TIS 1.3 interface. Its architecture combines a dedicated AVR 8-bit RISC CPU, hardware crypto accelerators for RSA-2048, SHA-1, HMAC, and AES-128, and internal EEPROM for persistent RSA key storage.

It operates exclusively via SPI (MISO/MOSI/SPI_CLK/SPI_CS#/SPI_RST#/PIRQ#) at up to 45 MHz (typical PC range: 24–33 MHz), supports hardware physical presence (PP/GPIO), tamper detection (XTamper), and GPIO Express-00 for NV-indexed I/O - all powered from a single 3.3 V supply with integrated low-power idle mode.

Key Specifications

Parameter	Value and Actual Design Meaning
TCG Compliance	TPM 1.2 and PC Client TIS 1.3 - enables interoperable secure boot and remote attestation in Windows/Linux BIOS environments.
SPI Interface Speed	Up to 45 MHz - supports high-throughput command/response cycles; typical PC operation at 24–33 MHz ensures timing margin and noise resilience.
Crypto Engines	FIPS-140-2 certified RNG, AES-128, SHA-1, HMAC, RSA-2048 - provides NIST-validated primitives for key wrapping, signature, and hash operations without host CPU offload.
NV Storage	2066 bytes user-defined data - sufficient for storing platform configuration hashes, sealed keys, or policy-controlled credentials across reboots.
Supply Voltage	3.3 V ±10% - requires tight decoupling: 2200–4700 pF caps within 5 mm of each VCC–GND pair and 0.1 µF at VCC node junction.
Operating Temperature	−40°C to +85°C - qualified for industrial embedded applications including network appliances and edge controllers.
Package	32-pad QFN (32M3), 4.0 × 4.0 × 0.9 mm, 0.4 mm pitch - exposes GND center pad; compatible with standard reflow profiles and automated optical inspection.

Pinout & Package

AT97SC3205-U3A15-10 uses the 32-pad Very Thin QFN (32M3) package: 4.0 × 4.0 × 0.9 mm body, 0.4 mm lead pitch, exposed GND center pad internally tied to ground. Pin 1 marked by corner notch; pins numbered counterclockwise from top-left.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power Supply Input	3.3 V main supply; requires local 2200–4700 pF decoupling within 5 mm of adjacent GND pin per datasheet layout guidance.
GND	Ground Reference	System ground return; includes exposed center pad tied internally to GND - must be soldered for thermal and EMI performance.
MISO	SPI Data Output	Master-in-slave-out signal; driven by TPM during command response; high-impedance when inactive.
MOSI	SPI Data Input	Master-out-slave-in signal; sampled on rising SPI_CLK edge; accepts TCG-defined command packets.
SPI_CLK	SPI Clock Input	Asynchronous clock input; must be held high during idle to enter low-power state; max 45 MHz frequency.
SPI_CS#	SPI Chip Select	Active-low enable; asserts TPM SPI interface; must be deasserted between commands to prevent bus contention.
SPI_RST#	SPI Reset Input	Active-low hardware reset; ≥2 µs pulse required; tied to system reset per TCG compliance for TPM_Init synchronization.
PIRQ#	SPI Interrupt Output	Active-low open-drain interrupt; signals command completion or error; requires external pull-up resistor if used.
PP/GPIO	Physical Presence Indicator	Hardware-activated GPIO; active-high signal indicating user-authorized TPM configuration changes (e.g., clear owner).
TestBI/GPIO/XTamper	Multi-function Terminal	Configurable as GPIO, tamper detect (active-high), or test input; unused state requires tie to GND via 4.7 kΩ resistor.

Key Features

Feature	Design Value
Single-chip TPM 1.2 turnkey solution	Integrates firmware, crypto engines, RNG, EEPROM, and SPI interface - eliminates external memory or co-processor dependencies.
FIPS-140-2 Level 2 certification	Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies federal and enterprise security policy requirements for cryptographic module validation.
Hardware asymmetric crypto engine	Accelerates RSA-2048 key generation and signing in <100 ms - enables fast attestation without host CPU overhead or software library vulnerabilities.
Internal EEPROM for RSA keys	Stores multiple persistent RSA key pairs with lifecycle management - no external flash required; keys never exposed outside secure boundary.
GPIO Express-00 with NV indexing	Maps directly to TPM_NV_INDEX_GPIO_00 - allows firmware to bind GPIO state to platform configuration policies for conditional boot enforcement.

Applications

Secure Boot Verification	Platform Integrity Attestation
Use Scenario: Verifying signed bootloader and kernel images before execution in UEFI-based PCs and industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust for measurement and signature validation using stored RSA public keys and SHA-1 digests. Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to hardware identity and measured values.	Use Scenario: Reporting runtime system state (e.g., OS version, driver list, registry keys) to remote management servers. IC Role / Device Role / Timing Role: TPM generates quote signatures over PCR registers containing dynamic measurements; responds to TCG Quote commands via SPI. Use Value: Enables zero-trust infrastructure by proving unaltered software stack without exposing sensitive data during transmission.
Firmware Sealing & Unsealing	Hardware-Based Key Management
Use Scenario: Encrypting firmware update payloads so they only decrypt on authorized hardware with matching TPM identity. IC Role / Device Role / Timing Role: TPM seals data using PCR-bound keys; unseals only when current platform measurements match original sealing state. Use Value: Enforces device-specific firmware updates and prevents downgrade attacks or cross-device payload injection.	Use Scenario: Storing and protecting cryptographic keys used by HSMs, secure elements, or TLS stacks in network appliances. IC Role / Device Role / Timing Role: TPM serves as isolated key vault - generates, stores, and performs RSA/AES operations without exposing private keys to host memory. Use Value: Mitigates side-channel and memory-dump attacks by keeping secrets inside tamper-resistant silicon with FIPS-validated crypto.

Secure Boot Verification

Platform Integrity Attestation

Use Scenario: Verifying signed bootloader and kernel images before execution in UEFI-based PCs and industrial gateways.

IC Role / Device Role / Timing Role: TPM acts as root-of-trust for measurement and signature validation using stored RSA public keys and SHA-1 digests.

Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to hardware identity and measured values.

Use Scenario: Reporting runtime system state (e.g., OS version, driver list, registry keys) to remote management servers.

IC Role / Device Role / Timing Role: TPM generates quote signatures over PCR registers containing dynamic measurements; responds to TCG Quote commands via SPI.

Use Value: Enables zero-trust infrastructure by proving unaltered software stack without exposing sensitive data during transmission.

Firmware Sealing & Unsealing

Hardware-Based Key Management

Use Scenario: Encrypting firmware update payloads so they only decrypt on authorized hardware with matching TPM identity.

IC Role / Device Role / Timing Role: TPM seals data using PCR-bound keys; unseals only when current platform measurements match original sealing state.

Use Value: Enforces device-specific firmware updates and prevents downgrade attacks or cross-device payload injection.

Use Scenario: Storing and protecting cryptographic keys used by HSMs, secure elements, or TLS stacks in network appliances.

IC Role / Device Role / Timing Role: TPM serves as isolated key vault - generates, stores, and performs RSA/AES operations without exposing private keys to host memory.

Use Value: Mitigates side-channel and memory-dump attacks by keeping secrets inside tamper-resistant silicon with FIPS-validated crypto.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon SLB9670	TPM 2.0 compliant; supports SHA-256, ECC, and larger NV space; requires different SPI command set and firmware integration.	Required for Windows 11 and newer Linux distros mandating TPM 2.0; not backward-compatible with legacy TPM 1.2 BIOS implementations.	Select SLB9670 only when upgrading to TPM 2.0 ecosystem; AT97SC3205-U3A15-10 remains optimal for existing TPM 1.2 designs with minimal firmware change.
Nuvoton NPCT750	TPM 1.2 compliant; same SPI interface and TIS 1.3 support; smaller 24-pin QFN package; lower NV storage (1280 bytes).	Valid drop-in replacement in space-constrained designs where 2066-byte NV requirement is not critical; identical command-level behavior for core TPM functions.	NPCT750 offers footprint reduction but sacrifices 38% NV capacity; verify application data size fits before substitution.

Compared with SLB9670 and NPCT750, the AT97SC3205-U3A15-10 delivers full TPM 1.2 compliance with maximum NV storage and proven integration in legacy PC BIOS - making it the most stable choice for industrial OEMs maintaining long-lifecycle platforms without migrating to TPM 2.0.

Availability

AT97SC3205-U3A15-10 is available at Aetrix Electronics and suitable for secure boot verification, platform integrity attestation, firmware sealing, and hardware-based key management requiring stable component supply across multi-year industrial product lifecycles.

Supply support for AT97SC3205-U3A15-10 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 support for legacy Atmel security ICs. The company specializes in microcontrollers, analog, and security solutions for industrial, automotive, and communications markets.

The AT97SC3205-U3A15-10 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, turnkey hardware security for PC client platforms and embedded systems requiring TCG-compliant root-of-trust functionality.

FAQ

What is the operating voltage range for the AT97SC3205-U3A15-10?

The AT97SC3205-U3A15-10 operates at a nominal supply voltage of 3.3 V with ±10% tolerance (2.97 V to 3.63 V). It requires strict decoupling: 2200–4700 pF capacitors placed within 5 mm of each VCC–GND pair, plus a 0.1 µF capacitor at the VCC node junction. This ensures stable operation across its −40°C to +85°C industrial temperature range and prevents noise-induced command failures.

Does the AT97SC3205-U3A15-10 support TPM 2.0?

No, the AT97SC3205-U3A15-10 implements only TPM 1.2 and the PC Client-Specific TIS 1.3 interface. It does not support TPM 2.0 features such as SHA-256, ECC cryptography, or the new command hierarchy. For TPM 2.0 compliance, alternatives like the Infineon SLB9670 must be selected - the AT97SC3205-U3A15-10 remains fully functional and supported in legacy TPM 1.2 ecosystems including Windows 7–10 and many industrial BIOS implementations.

How is the AT97SC3205-U3A15-10 reset during system initialization?

The AT97SC3205-U3A15-10 uses the active-low SPI_RST# pin for hardware reset. A minimum 2 µs low pulse resets internal state and is functionally equivalent to power cycling. Per TCG requirements, SPI_RST# must be tied directly to the system reset signal to ensure synchronized TPM_Init during boot. The chip also enters low-power mode automatically when idle - no additional reset sequencing beyond SPI_RST# assertion is needed.

What is the purpose of the TestBI/GPIO/XTamper pin on the AT97SC3205-U3A15-10?

The TestBI/GPIO/XTamper pin on the AT97SC3205-U3A15-10 is a multifunction terminal configurable as general-purpose GPIO, external tamper event indicator (active-high), or manufacturing test input. In production use, it commonly serves as XTamper to detect physical enclosure breaches. If unused, it must be tied to GND via a 4.7 kΩ resistor per datasheet guidance - floating this pin may cause undefined behavior or false tamper assertions.

Can the AT97SC3205-U3A15-10 be used in automotive applications?

No - the AT97SC3205-U3A15-10 is not qualified for automotive use. Atmel's official documentation explicitly states that its products "are not designed nor intended for use in automotive applications unless specifically designated as automotive-grade." This part is rated for industrial temperature range (−40°C to +85°C) and intended for PC, server, and industrial embedded applications - not AEC-Q100 qualified environments requiring extended reliability and failure mode analysis.

AT97SC3205-U3A15-10 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:: SPI

Number of I/O:: 4

Voltage - Supply:: 3.3V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP

AT97SC3205-U3A15-10 FAQ

1.How can I place an order for AT97SC3205-U3A15-10 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT97SC3205-U3A15-10 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 AT97SC3205-U3A15-10 reliable?

The price and inventory of AT97SC3205-U3A15-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-U3A15-10 is usually 5 days.

3.What payment methods are accepted for AT97SC3205-U3A15-10?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-U3A15-10 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT97SC3205-U3A15-10?

AT97SC3205-U3A15-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT97SC3205-U3A15-10 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 AT97SC3205-U3A15-10?

For technical support, including AT97SC3205-U3A15-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-U3A15-10 requirements.

6.How does Aetrix verify that AT97SC3205-U3A15-10 is sourced from the original manufacturer or authorized distributors?

All AT97SC3205-U3A15-10 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 AT97SC3205-U3A15-10 meets industry standards.

7.What is the process for return or replacement of AT97SC3205-U3A15-10?

All AT97SC3205-U3A15-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-U3A15-10, 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 AT97SC3205-U3A15-10 part is unused and in its original packaging.

Return procedure for AT97SC3205-U3A15-10:

1.Submit a request within 90 days.

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

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