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Microchip Technology AT97SC3205-G3M45-20
- Part No.:
- AT97SC3205-G3M45-20
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205-G3M45-20.pdf
- Description:
- FF COM SPI TPM 4X4 32VQFN SEK -
- Quantity:
- Payment:
- Shipping:
Inventory:1,423
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Product details
Overview
AT97SC3205-G3M45-20 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based asymmetric cryptography, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It integrates an AVR RISC microprocessor and operates at 3.3V with SPI interface up to 45MHz, deployed in PC motherboards and embedded systems requiring secure boot and key attestation.
For engineers reviewing the AT97SC3205-G3M45-20 datasheet, AT97SC3205-G3M45-20 pinout, AT97SC3205-G3M45-20 application, or AT97SC3205-G3M45-20 equivalent, this page delivers verified package mapping (32-pad QFN), SPI-TIS 1.3 compliance, FIPS-140-2 module certification status, GPIO Express-00/PP/GPIO terminal roles, and industrial temperature range (-40°C to +85°C) support - all critical for BIOS integration, tamper-aware design, and OEM TPM qualification.
Technical Context
The AT97SC3205-G3M45-20 implements the TCG TPM 1.2 specification using an on-chip AVR 8-bit RISC CPU with integrated EEPROM for RSA key storage and dynamic internal memory management for key caching. Its crypto engine supports HMAC, AES-128, SHA-1, and RSA-2048 operations, all validated under FIPS-140-2 Level 2.
It uses a dedicated SPI interface compliant with TCG PC Client-Specific TPM Interface Specification (TIS) v1.3, with active-low PIRQ# interrupt signaling and SPI_RST# reset control synchronized to system power-on reset. Physical security circuitry includes tamper detection via XTamper input and secure firmware execution enforced by ROM-based boot code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 and TIS v1.3 - ensures interoperability with Windows BitLocker, Linux tpm-tools, and UEFI firmware stacks |
| Crypto Certification | FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, RSA - required for government and enterprise security validation |
| Interface | SPI up to 45MHz (typical PC use: 24–33MHz) - enables low-latency command/response cycles without PCIe or LPC bus dependency |
| Supply Voltage | 3.3V ±10% - matches standard motherboard I/O rail; requires 2200–4700pF decoupling per VCC pin within 5mm of GND |
| Temperature Range | -40°C to +85°C - qualified for industrial embedded platforms including network appliances and edge servers |
| NV Storage | 2066 bytes user-defined data - sufficient for platform configuration hashes, endorsement keys, and sealed storage objects |
| Package | 32-pad QFN (4.0 × 4.0 × 0.9 mm, 0.4 mm pitch) - surface-mount compatible with automated SMT assembly and thermal pad grounding |
Pinout & Package
AT97SC3205-G3M45-20 is packaged in a 32-pad Very Thin QFN (32M3) with exposed thermal pad tied internally to GND. Pinout supports full TIS-compliant SPI communication, hardware physical presence assertion, GPIO express indexing, and tamper event signaling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires localized 2200–4700pF decoupling within 5mm of adjacent GND pins |
| GND | Ground reference | System ground return; substrate center pad is internally connected to GND and may be soldered or left floating |
| MISO / MOSI / SPI_CLK / SPI_CS# / SPI_RST# | SPI interface signals | Full-duplex SPI slave operation per TIS v1.3; SPI_RST# must be tied to system reset for TCG compliance |
| PIRQ# | Interrupt output | Active-low interrupt to host chipset; if unused, tie to GND via 4.7kΩ resistor |
| PP/GPIO | Physical presence indicator | Active-high hardware PP signal; internal pull-down; floats when unused - required for BIOS-level admin lockout enforcement |
| GPIO Express-00 | Indexed GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up; used for platform-specific state signaling during boot or recovery |
| TestBI/GPIO/XTamper | Multi-function terminal | Configurable as GPIO, tamper input (active high), or test pin; tie to GND via 4.7kΩ if unused |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | On-die RSA-2048 key generation and signing offloads CPU, prevents private key exposure in software stacks |
| FIPS-140-2 Certified RNG | Validated entropy source for cryptographic key derivation - satisfies NIST SP 800-90A and TCG requirements |
| Internal EEPROM Key Storage | Dedicated non-volatile memory for RSA endorsement and storage root keys - immune to OS-level memory scraping |
| GPIO Express Indexing | Predefined NV index mapping (TPM_NV_INDEX_GPIO_00) enables deterministic firmware access without runtime enumeration |
| Tamper Detection Input (XTamper) | Hardware-level external tamper event capture - triggers key zeroization and audit logging before physical breach completes |
Applications
| Secure Boot Authentication | Platform Configuration Integrity |
|---|---|
Use Scenario: Verifying firmware signature and measuring boot sequence integrity before loading OS kernel. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; performs SHA-1 hashing of BIOS/UEFI modules and stores PCR values in protected registers. Use Value: Prevents unauthorized firmware modification and ensures only signed, unaltered code executes - foundational for Windows Secure Boot and measured boot. | Use Scenario: Detecting unauthorized hardware changes (e.g., GPU, NIC, storage controller) across reboots. IC Role / Device Role / Timing Role: TPM monitors platform configuration registers (PCRs) and compares against known-good baselines stored in NV memory. Use Value: Enables remote attestation of hardware trustworthiness - critical for cloud infrastructure providers validating tenant VM host integrity. |
| Endorsement Key Management | Sealed Storage Encryption |
Use Scenario: Generating and protecting the unique Endorsement Key (EK) used to identify the TPM to remote verifiers. IC Role / Device Role / Timing Role: TPM generates EK during manufacturing provisioning; stores it in internal EEPROM with write-lock protection. Use Value: Provides cryptographically bound device identity - essential for certificate issuance, device onboarding, and zero-touch enrollment in enterprise MDM systems. | Use Scenario: Encrypting disk encryption keys so they unlock only when platform state matches pre-defined PCR values. IC Role / Device Role / Timing Role: TPM performs AES encryption/decryption of symmetric keys using PCR-bound authorization policies. Use Value: Ensures encrypted data remains inaccessible after unauthorized firmware or OS modifications - core to BitLocker and LUKS2 sealed key workflows. |
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 | TPM 2.0 compliant; supports SHA-256, ECC, and PCR banks beyond TPM 1.2 scope; 32-pin QFN same footprint | Required for Windows 11 and newer UEFI firmware; lacks direct TPM 1.2 backward compatibility in legacy BIOS | Select for new designs targeting long-term Windows support and enhanced crypto agility |
| Nuvoton NPCT650KB0DX | TPM 1.2 compliant; identical SPI-TIS interface and 3.3V operation; 32-pin QFN but different pin assignment for GPIO/PP signals | Requires PCB layout revision due to non-identical pinout; supports same industrial temp range and FIPS-140-2 certification | Select only when redesigning board layout and sourcing flexibility outweighs drop-in replacement need |
Compared with AT97SC3205-G3M45-20, the SLB9665TT2.0 offers forward-compatible TPM 2.0 features but mandates firmware updates, while the NPCT650KB0DX maintains functional equivalence at the cost of board-level redesign - making AT97SC3205-G3M45-20 optimal for sustaining existing TPM 1.2 deployments with minimal integration effort.
Availability
AT97SC3205-G3M45-20 is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity verification, endorsement key provisioning, and sealed storage encryption requiring stable component supply across industrial computing, server OEM, and embedded security programs.
Supply support for AT97SC3205-G3M45-20 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, delivering trusted computing solutions for enterprise, industrial, and IoT applications with emphasis on long-term product availability and security certification maintenance.
The AT97SC3205-G3M45-20 belongs to Atmel's TPM family designed specifically for PC client and embedded platform integration, providing turnkey hardware-rooted security with pre-certified crypto engines and BIOS-ready firmware.
FAQ
What is the operating temperature range supported by the AT97SC3205-G3M45-20?
The AT97SC3205-G3M45-20 is rated for industrial operation from -40°C to +85°C. This range is validated per the datasheet and enables deployment in network infrastructure equipment, edge servers, and ruggedized embedded systems where ambient conditions exceed commercial-grade limits. The AT97SC3205-G3M45-20 maintains full TCG 1.2 functionality and FIPS-140-2 crypto engine performance across this entire range without derating.
Does the AT97SC3205-G3M45-20 support TPM 2.0 functionality?
No, the AT97SC3205-G3M45-20 implements only TCG TPM Specification Version 1.2 and TIS v1.3. It does not support TPM 2.0 features such as SHA-256, ECC algorithms, hierarchical key structures, or PCR banks beyond PCR0–PCR15. For TPM 2.0 compliance, Microchip recommends the SLB9665 series. The AT97SC3205-G3M45-20 remains fully functional for legacy Windows 7/8/10 deployments requiring TPM 1.2.
How is the AT97SC3205-G3M45-20 physically secured against tampering?
The AT97SC3205-G3M45-20 incorporates physical security circuitry including a dedicated XTamper input pin that detects external tamper events and triggers immediate key zeroization. Its secure hardware layout, ROM-based boot code, and FIPS-140-2 certified RNG prevent side-channel leakage and unauthorized firmware access. The AT97SC3205-G3M45-20 also enforces strict access controls on NV storage and PCR registers through authorization policies.
What SPI clock frequency should be used for reliable operation of the AT97SC3205-G3M45-20 in a PC platform?
While the AT97SC3205-G3M45-20 supports SPI up to 45MHz, the typical PC operating range specified in the datasheet is 24MHz to 33MHz. Using frequencies within this band ensures timing margin compliance with TCG TIS v1.3, avoids setup/hold violations on PIRQ# assertion, and maintains interoperability with standard BIOS implementations. The AT97SC3205-G3M45-20 automatically enters low-power mode when idle, reducing SPI_CLK-related power consumption.
Is the AT97SC3205-G3M45-20 pin-compatible with other Atmel TPM devices like the AT97SC3204?
No, the AT97SC3205-G3M45-20 is not pin-compatible with the AT97SC3204. Although both are TPM 1.2 devices, the AT97SC3205-G3M45-20 uses a 32-pad QFN package (32M3) with specific pin assignments for GPIO Express-00, PP/GPIO, and TestBI/GPIO/XTamper, whereas the AT97SC3204 uses a 28-pin TSSOP (28X1) with different pin count and layout. Board-level replacement requires PCB redesign. The AT97SC3205-G3M45-20 is optimized for space-constrained layouts requiring QFN thermal performance.
AT97SC3205-G3M45-20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- 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:
- 32-VQFN (4x4)
AT97SC3205-G3M45-20 FAQ
1.How can I place an order for AT97SC3205-G3M45-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-G3M45-20 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-G3M45-20 reliable?
The price and inventory of AT97SC3205-G3M45-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-G3M45-20 is usually 5 days.
3.What payment methods are accepted for AT97SC3205-G3M45-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-G3M45-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-G3M45-20?
AT97SC3205-G3M45-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-G3M45-20 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-G3M45-20?
For technical support, including AT97SC3205-G3M45-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-G3M45-20 requirements.
6.How does Aetrix verify that AT97SC3205-G3M45-20 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-G3M45-20 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-G3M45-20 meets industry standards.
7.What is the process for return or replacement of AT97SC3205-G3M45-20?
All AT97SC3205-G3M45-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-G3M45-20, 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-G3M45-20 part is unused and in its original packaging.
Return procedure for AT97SC3205-G3M45-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205-G3M45-20 Tags
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