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

Microchip Technology AT97SC3205-X3A15-20

Name: AT97SC3205-X3A15-20
Brand: Microchip Technology
SKU: AT97SC3205-X3A15-20
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT97SC3205-X3A15-20

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

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

Datasheet:: AT97SC3205-X3A15-20.pdf

Description:: IC CRYPTO TPM 28TSSOP

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Product details

Overview

AT97SC3205-X3A15-20 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based cryptographic functions for platform integrity verification. It integrates an AVR RISC microprocessor, FIPS-140-2 certified RNG, AES/SHA/RSA engines, 2066-byte NV user storage, and operates at 3.3V with SPI interface up to 45MHz - deployed in PC motherboards and industrial embedded systems requiring secure boot and attestation.

For engineers reviewing the AT97SC3205-X3A15-20 datasheet, AT97SC3205-X3A15-20 pinout, AT97SC3205-X3A15-20 application, or AT97SC3205-X3A15-20 equivalent, key selection considerations include TCG 1.2/TIS 1.3 compliance, SPI timing constraints (24–33 MHz typical), GPIO express mapping (TPM_NV_INDEX_GPIO_00), physical presence signaling via PP/GPIO, and dual-package availability (28-pin TSSOP / 32-pad QFN).

Technical Context

The AT97SC3205-X3A15-20 implements a dedicated TPM 1.2 stack in silicon with on-chip firmware, eliminating host CPU dependency for core cryptographic operations. Its hardware crypto engine accelerates RSA key generation and signing, SHA-1 hashing, HMAC authentication, and AES encryption - all validated under FIPS-140-2 Level 2 certification.

It uses dynamic internal memory management for RSA key caching and supports TCG-defined command sets including TPM_FlushSpecific and TPM_LoadKey2. The SPI interface complies with TIS 1.3, featuring active-low PIRQ# interrupt signaling, SPI_RST# reset synchronization with system power-on reset, and configurable GPIOs (PP/GPIO, GPIO Express-00, TestBI/XTamper) for platform-specific tamper detection and physical presence assertion.

Key Specifications

Parameter	Value and Actual Design Meaning
TCG Compliance	TPM Specification v1.2 and PC Client-Specific TIS v1.3 - ensures interoperability with BIOS/UEFI and OS-level TPM stacks (e.g., Windows BitLocker, Linux tpm-tools)
SPI Interface Speed	Up to 45 MHz max; typical PC operation at 24–33 MHz - defines maximum command throughput and latency for platform boot-time attestation
Supply Voltage	3.3 V ±10% - requires tight decoupling (2200–4700 pF near each VCC pin, <5 mm to adjacent GND) for stable RNG and crypto operation
NV User Storage	2066 bytes - allocated for persistent platform configuration data, sealed storage keys, or OEM-specific credentials
FIPS Certification	FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, RSA - validates cryptographic module integrity for government and regulated industry deployments
Operating Temperature	−40°C to +85°C - supports industrial-grade motherboard and embedded controller applications without derating
Package Options	28-pin thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) and 32-pad QFN (4.0 × 4.0 × 0.9 mm, 0.4 mm pitch) - enables layout flexibility for space-constrained PCBs

Pinout & Package

AT97SC3205-X3A15-20 is offered in two RoHS-compliant packages: 28-pin thin TSSOP (28X1) and 32-pad very thin QFN (32M3). Both support industrial temperature range (−40°C to +85°C) and share identical pin functionality; only pin count and mechanical footprint differ.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	3.3 V main supply; requires localized high-frequency decoupling (2200–4700 pF) within 5 mm of each VCC pin to ensure RNG stability and crypto engine reliability
GND	Ground reference	System ground return; multiple GND pins provide low-impedance paths for digital and analog sections - critical for noise isolation between SPI and crypto blocks
MISO / MOSI / SPI_CLK / SPI_CS# / SPI_RST#	SPI bus interface	Standard 4-wire SPI slave interface; SPI_RST# must be tied to system reset per TCG requirements; SPI_CS# enables command framing and prevents bus contention
PIRQ#	Interrupt output	Active-low interrupt signal asserted by TPM to notify host of command completion or error - requires pull-down or direct GND tie if unused
PP/GPIO	Physical presence indicator	Hardware-controlled input indicating user-authorized physical access; active-high signal used during BIOS setup to enable/disable TPM features - internal pull-down ensures safe default state
GPIO Express-00	Configurable I/O	Maps to TPM_NV_INDEX_GPIO_00; supports NV write/read and XOR chain output in test mode - internal pull-up allows floating when unused
TestBI/GPIO/XTamper	Multi-function terminal	Configurable as GPIO, external tamper detector (active-high), or manufacturing test input - must be tied to GND via 4.7 kΩ if unused to prevent spurious interrupts

Key Features

Feature	Design Value
Hardware Asymmetric Crypto Engine	Accelerates RSA key generation (1024/2048-bit), signing, and verification offloading host CPU - essential for fast boot-time PCR extension and remote attestation
FIPS-140-2 Level 2 Certified RNG	Validated entropy source feeding all cryptographic operations - required for NIST-compliant key derivation and non-replayable challenge-response protocols
Internal EEPROM for RSA Keys	Dedicated non-volatile storage for up to 16 RSA key pairs - eliminates need for external secure memory and simplifies key lifecycle management
Dynamic Key Cache Management	Automatic SRAM-based key caching with TPM_FlushSpecific/TPM_LoadKey2 control - reduces latency during multi-key operations without host intervention
Secure Firmware Integration	Pre-programmed, immutable TPM stack compliant with TCG 1.2 - prevents runtime tampering and ensures consistent behavior across OEM platforms

Applications

PC Motherboard Security	Industrial Control System Integrity
Use Scenario: Integrated into desktop/laptop motherboard BIOS to enable secure boot, disk encryption (BitLocker), and remote attestation. IC Role / Device Role / Timing Role: Root-of-trust anchor performing PCR measurements during POST, sealing keys to platform state, and responding to TCG-compliant host commands over SPI. Use Value: Enables hardware-enforced chain-of-trust from power-on reset through OS load - preventing unauthorized firmware or bootloader modifications.	Use Scenario: Embedded in programmable logic controllers (PLCs) or HMIs to verify firmware authenticity and detect unauthorized configuration changes. IC Role / Device Role / Timing Role: Tamper-resistant security co-processor storing device identity keys and validating signed firmware updates before execution. Use Value: Ensures operational continuity in harsh environments by cryptographically binding firmware to hardware identity - mitigating supply-chain spoofing and ransomware attacks.
Server Platform Attestation	Medical Device Data Protection
Use Scenario: Deployed in rack-mounted servers to support Intel TXT or AMD SVM trusted launch environments and hypervisor-level attestation. IC Role / Device Role / Timing Role: TPM 1.2 endpoint providing measured boot logs, sealed storage for VM encryption keys, and hardware-backed random number generation for TLS session keys. Use Value: Meets HIPAA and PCI-DSS requirements for cryptographic key protection and audit-ready platform integrity evidence.	Use Scenario: Used in FDA-cleared diagnostic equipment to protect patient data confidentiality and ensure firmware integrity during regulatory audits. IC Role / Device Role / Timing Role: Secure element managing cryptographic keys for DICOM encryption, digitally signing device logs, and enforcing secure update policies via PP/GPIO-verified physical presence. Use Value: Provides verifiable cryptographic assurance for FDA 21 CFR Part 11 compliance - enabling electronic signatures and tamper-evident audit trails.

PC Motherboard Security

Industrial Control System Integrity

Use Scenario: Integrated into desktop/laptop motherboard BIOS to enable secure boot, disk encryption (BitLocker), and remote attestation.

IC Role / Device Role / Timing Role: Root-of-trust anchor performing PCR measurements during POST, sealing keys to platform state, and responding to TCG-compliant host commands over SPI.

Use Value: Enables hardware-enforced chain-of-trust from power-on reset through OS load - preventing unauthorized firmware or bootloader modifications.

Use Scenario: Embedded in programmable logic controllers (PLCs) or HMIs to verify firmware authenticity and detect unauthorized configuration changes.

IC Role / Device Role / Timing Role: Tamper-resistant security co-processor storing device identity keys and validating signed firmware updates before execution.

Use Value: Ensures operational continuity in harsh environments by cryptographically binding firmware to hardware identity - mitigating supply-chain spoofing and ransomware attacks.

Server Platform Attestation

Medical Device Data Protection

Use Scenario: Deployed in rack-mounted servers to support Intel TXT or AMD SVM trusted launch environments and hypervisor-level attestation.

IC Role / Device Role / Timing Role: TPM 1.2 endpoint providing measured boot logs, sealed storage for VM encryption keys, and hardware-backed random number generation for TLS session keys.

Use Value: Meets HIPAA and PCI-DSS requirements for cryptographic key protection and audit-ready platform integrity evidence.

Use Scenario: Used in FDA-cleared diagnostic equipment to protect patient data confidentiality and ensure firmware integrity during regulatory audits.

IC Role / Device Role / Timing Role: Secure element managing cryptographic keys for DICOM encryption, digitally signing device logs, and enforcing secure update policies via PP/GPIO-verified physical presence.

Use Value: Provides verifiable cryptographic assurance for FDA 21 CFR Part 11 compliance - enabling electronic signatures and tamper-evident audit trails.

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 storage (2048+ bytes); higher SPI clock tolerance (up to 66 MHz)	Required for new designs targeting Windows 11 or Linux kernel ≥5.10; lacks native TCG 1.2 backward compatibility	Select for future-proof platforms needing TPM 2.0 features; not drop-in compatible due to command set and register map differences
Nuvoton NPCT750	TPM 1.2 + TIS 1.3 compliant; same 3.3 V supply and SPI interface; smaller 5×5 mm QFN-32 package; lower max SPI speed (25 MHz)	Targeted at ultra-compact embedded designs where board space is constrained; limited industrial temp support (−20°C to +70°C)	Consider for cost-sensitive industrial gateways where full −40°C operation is not required and 25 MHz SPI bandwidth suffices

Compared with SLB9670 and NPCT750, the AT97SC3205-X3A15-20 delivers verified TCG 1.2 compliance with FIPS-140-2 Level 2 certification, industrial temperature support, and flexible dual-package options - making it optimal for legacy-compatible PC and industrial control designs requiring field-proven TPM 1.2 functionality.

Availability

AT97SC3205-X3A15-20 is available at Aetrix Electronics and suitable for PC motherboard design, industrial control system integration, and medical device security applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AT97SC3205-X3A15-20 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 security IC portfolio, including legacy TPM solutions. The company specializes in microcontrollers, analog, FPGA, and secure authentication devices for industrial, automotive, and computing markets.

The AT97SC3205-X3A15-20 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, turnkey hardware security for PC and embedded platforms requiring TCG 1.2 compliance, secure boot, and cryptographic key protection.

FAQ

What is the primary compliance standard met by the AT97SC3205-X3A15-20?

The AT97SC3205-X3A15-20 is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Specification Version 1.2 and the PC Client-Specific TPM Interface Specification (TIS) Version 1.3. This ensures interoperability with BIOS/UEFI implementations and operating system security stacks such as Microsoft Windows BitLocker and Linux tpm-tools. The AT97SC3205-X3A15-20 also holds FIPS-140-2 Level 2 certification for its RNG, HMAC, AES, SHA, and RSA engines - validating its use in regulated environments.

Does the AT97SC3205-X3A15-20 support both commercial and industrial temperature ranges?

Yes, the AT97SC3205-X3A15-20 is qualified for industrial operation from −40°C to +85°C, as confirmed in the official ordering information and package documentation. This makes it suitable for deployment in ruggedized motherboards, factory automation controllers, and outdoor edge computing devices where extended thermal performance is required. The part number suffix "X3A15-20" specifically denotes the industrial-grade variant.

How does the AT97SC3205-X3A15-20 handle cryptographic key storage?

The AT97SC3205-X3A15-20 includes internal EEPROM dedicated to RSA key storage and 2066 bytes of NV user-defined data space. It implements dynamic internal memory management to cache multiple RSA keys in SRAM, automatically handling key loading and flushing via standardized TCG commands like TPM_FlushSpecific and TPM_LoadKey2 - eliminating the need for host-side key management logic. All key operations occur within the secure boundary of the AT97SC3205-X3A15-20.

What are the SPI interface requirements for reliable operation of the AT97SC3205-X3A15-20?

The AT97SC3205-X3A15-20 supports SPI up to 45 MHz but specifies 24–33 MHz as the typical operating range for PC platforms. Critical design requirements include tying SPI_RST# to the system reset signal per TCG specifications, using active-low PIRQ# for interrupt notification, and ensuring proper decoupling (2200–4700 pF capacitors placed <5 mm from each VCC pin). The AT97SC3205-X3A15-20 also requires stable SPI_CLK prior to releasing SPI_RST# during power-up.

Can the GPIO pins on the AT97SC3205-X3A15-20 be used for tamper detection?

Yes - the TestBI/GPIO/XTamper pin on the AT97SC3205-X3A15-20 can be configured as an external tamper input (active-high), as documented in Atmel's "AT97SC3205 Specific TPM Commands Reference Guide." Additionally, the PP/GPIO pin serves as a hardware physical presence indicator, and GPIO Express-00 maps to TPM_NV_INDEX_GPIO_00 for NV-controlled I/O. All three pins support configurable pull resistors and require appropriate termination (e.g., 4.7 kΩ to GND) when unused to prevent false triggers.

AT97SC3205-X3A15-20 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:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP

AT97SC3205-X3A15-20 FAQ

1.How can I place an order for AT97SC3205-X3A15-20 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT97SC3205-X3A15-20 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-X3A15-20 reliable?

The price and inventory of AT97SC3205-X3A15-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-X3A15-20 is usually 5 days.

3.What payment methods are accepted for AT97SC3205-X3A15-20?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-X3A15-20 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT97SC3205-X3A15-20?

AT97SC3205-X3A15-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT97SC3205-X3A15-20 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-X3A15-20?

For technical support, including AT97SC3205-X3A15-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-X3A15-20 requirements.

6.How does Aetrix verify that AT97SC3205-X3A15-20 is sourced from the original manufacturer or authorized distributors?

All AT97SC3205-X3A15-20 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-X3A15-20 meets industry standards.

7.What is the process for return or replacement of AT97SC3205-X3A15-20?

All AT97SC3205-X3A15-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-X3A15-20, 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-X3A15-20 part is unused and in its original packaging.

Return procedure for AT97SC3205-X3A15-20:

1.Submit a request within 90 days.

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

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