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Microchip Technology AT97SC3205-H3M45-10
- Part No.:
- AT97SC3205-H3M45-10
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205-H3M45-10.pdf
- Description:
- FF IND SPI TPM 4X4 32VQFN UEK -
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205-H3M45-10 from Microchip (acquired 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 for secure boot and key attestation.
For engineers reviewing the AT97SC3205-H3M45-10 datasheet, AT97SC3205-H3M45-10 pinout, AT97SC3205-H3M45-10 application, or AT97SC3205-H3M45-10 equivalent, this page delivers verified package mapping (32-pad QFN), SPI-TIS 1.3 compliance, industrial temperature range (−40°C to +85°C), GPIO express functionality, and tamper detection support - all confirmed from Atmel-8884AS datasheet summary.
Technical Context
The AT97SC3205-H3M45-10 implements the TCG TPM 1.2 specification with full PC Client-Specific TIS 1.3 interface compliance. Its architecture embeds an AVR 8-bit RISC CPU, dedicated crypto engine, and dynamic internal key cache management - eliminating need for host-side key lifecycle intervention beyond standard TPM_FlushSpecific and TPM_LoadKey2 commands.
It features a FIPS-140-2 certified hardware random number generator used for both TCG protocol functions and system-level randomization, alongside physical security circuitry and tamper detection via XTamper pin. The device enters low-power state automatically during idle periods without host coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 and PC Client-Specific TIS 1.3 - ensures interoperability with BIOS/UEFI and OS security stacks (e.g., Windows BitLocker, Linux tpm-tools) |
| SPI Interface Speed | Up to 45 MHz (typical PC operation 24–33 MHz) - enables high-throughput command/response cycles without bus contention |
| 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 |
| FIPS Certification | FIPS-140-2 Level 2 certified module including RNG, HMAC, AES, SHA, RSA - satisfies federal and enterprise cryptographic validation requirements |
| Nonvolatile Storage | 2066 bytes user-defined NV space - supports persistent policy objects, sealed data, and platform configuration registers (PCRs) |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded deployment in extended thermal environments |
| Package Type | 32-pad QFN (32M3), 4.0 × 4.0 × 0.9 mm, 0.4 mm pitch - surface-mount compatible with automated PCB assembly and thermal pad grounding |
Pinout & Package
AT97SC3205-H3M45-10 uses the 32-pad Very Thin QFN (32M3) package: 4.0 × 4.0 × 0.9 mm body, 0.4 mm lead pitch, exposed thermal pad tied internally to GND. Pin 1 marked by corner cut; substrate center pad must be connected to system ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires local 2200–4700 pF decoupling per pin and global 0.1 µF bypass |
| GND | Ground reference | System ground return; multiple pins distributed for low-impedance path and noise suppression |
| MISO | SPI data output | Master-In-Slave-Out signal - transmits TPM responses on SPI bus; open-drain capable |
| MOSI | SPI data input | Master-Out-Slave-In signal - receives TPM commands and data; driven by host controller |
| SPI_CS# | Chip select | Active-low enable for SPI transaction; must be asserted before clock edge to initiate valid frame |
| SPI_CLK | SPI clock input | Driven by host; high-idle polarity; frequency up to 45 MHz; must be held high during idle for power savings |
| PIRQ# | Interrupt request | Active-low interrupt output - signals command completion or event (e.g., PCR extend); pull-down recommended if unused |
| SPI_RST# | Hardware reset | Active-low asynchronous reset; ≥2 µs pulse required; must remain asserted until VCC and SPI_CLK stabilize at power-up |
| PP/GPIO | Physical presence / GPIO | Hardware Physical Presence indicator (active-high); also configurable as GPIO with internal pull-down |
| GPIO Express-00 | Dedicated NV-indexed GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up; used for platform-specific control signaling and status reporting |
| TestBI/GPIO/XTamper | Multi-function terminal | Configurable as GPIO, tamper detect input (active-high), or manufacturing test pin; tie to GND if unused |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | On-die RSA key generation and signing acceleration - offloads computationally intensive operations from host CPU while maintaining private key isolation |
| FIPS-140-2 Certified RNG | Entropy source validated to NIST SP 800-90A - provides cryptographically secure randomness for key derivation and protocol nonces |
| Internal EEPROM for RSA Keys | Dedicated nonvolatile memory for protected storage of endorsement and storage root keys - prevents extraction even under physical attack |
| Secure Firmware Integration | Pre-flashed, immutable TPM firmware compliant with TCG specifications - eliminates field update risks and ensures consistent behavior across OEM platforms |
| Tamper Detection Support | XTamper pin enables external tamper switch integration - triggers key zeroization and audit log entry upon physical intrusion attempt |
Applications
| PC Motherboard Security | Industrial Embedded Control |
|---|---|
Use Scenario: Integrated into desktop/laptop motherboard BIOS firmware stack to enable secure boot, disk encryption (BitLocker), and remote attestation. IC Role / Device Role / Timing Role: Root-of-trust anchor providing cryptographic identity, measured boot log (PCR), and sealed storage for platform secrets. Use Value: Enables hardware-enforced chain-of-trust from power-on through OS load - preventing unauthorized firmware or bootloader modifications. | Use Scenario: Deployed in programmable logic controllers (PLCs) and HMIs requiring secure firmware updates and authenticated communication with SCADA systems. IC Role / Device Role / Timing Role: Secure credential store and cryptographic accelerator for TLS handshake and code signature verification. Use Value: Ensures firmware integrity and device identity in harsh industrial environments where network exposure and physical access risk are elevated. |
| Server Platform Integrity | Medical Device Authentication |
Use Scenario: Mounted on server baseboard management controllers (BMCs) to support out-of-band attestation and hardware-rooted key management. IC Role / Device Role / Timing Role: TPM 1.2 endpoint for IPMI v2.0 extensions and Intel TXT-compatible launch environment measurement. Use Value: Provides verifiable evidence of server boot state to cloud orchestration tools - critical for confidential computing and tenant isolation. | Use Scenario: Embedded in diagnostic imaging equipment (e.g., MRI, ultrasound) to enforce regulatory-compliant software licensing and prevent unauthorized feature activation. IC Role / Device Role / Timing Role: Secure license vault and cryptographic co-processor for digital signature validation of DICOM image headers and firmware patches. Use Value: Meets FDA 21 CFR Part 11 requirements for electronic records and signatures by binding identity to device-specific cryptographic keys. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM security applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9670 | TPM 2.0 compliant; supports SHA-256, ECC, and PCR extension beyond TPM 1.2 scope; higher SPI clock tolerance (up to 66 MHz) | Required for new designs targeting Windows 11 or Linux distributions mandating TPM 2.0; not backward-compatible with legacy TIS 1.3 drivers | Select SLB9670 when upgrading to TPM 2.0 ecosystem; AT97SC3205-H3M45-10 remains optimal for cost-sensitive TPM 1.2 maintenance or legacy BIOS platforms. |
| Nuvoton NPCT750 | TPM 1.2 + TIS 1.3 compliant; identical SPI interface timing and GPIO express mapping; supports same industrial temperature range (−40°C to +85°C) | Drop-in replacement in most layouts; shares identical pinout for 32-pin QFN variant and equivalent NV storage capacity (2048 bytes) | NPCT750 offers second-source availability and comparable qualification - suitable for dual-sourcing strategies without layout revision. |
Compared with Infineon SLB9670 and Nuvoton NPCT750, the AT97SC3205-H3M45-10 delivers proven TPM 1.2 interoperability with minimal driver footprint, lower gate count for cost-sensitive designs, and mature industrial qualification - making it ideal for sustaining legacy platforms where TPM 2.0 migration is not mandated.
Availability
AT97SC3205-H3M45-10 is available at Aetrix Electronics and suitable for PC motherboard design, industrial PLC security, and medical device authentication requiring stable component supply and long-term lifecycle assurance.
Supply support for AT97SC3205-H3M45-10 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 AT97SC3205 series.
The AT97SC3205 belongs to Atmel's Trusted Platform Module product line - engineered specifically for hardware-rooted trust in PC, server, and industrial embedded platforms compliant with TCG standards.
FAQ
What is the operating voltage range for the AT97SC3205-H3M45-10?
The AT97SC3205-H3M45-10 operates at a nominal supply voltage of 3.3 V with ±10% tolerance (2.97 V to 3.63 V). Decoupling is critical: 2200–4700 pF capacitors must be placed within 5 mm of each VCC–GND pair, and a 0.1 µF capacitor at the VCC node no farther than 10 mm from the device. This ensures stable operation across its −40°C to +85°C industrial temperature range.
Does the AT97SC3205-H3M45-10 support TPM 2.0?
No, the AT97SC3205-H3M45-10 implements only TPM 1.2 and PC Client-Specific TIS 1.3. It does not support TPM 2.0 features such as SHA-256 hashing, ECC algorithms, or hierarchical key structures. For TPM 2.0 compliance, consider alternatives like the Infineon SLB9670. The AT97SC3205-H3M45-10 remains fully functional in legacy BIOS/UEFI environments requiring TPM 1.2.
How is tamper detection implemented on the AT97SC3205-H3M45-10?
The AT97SC3205-H3M45-10 supports tamper detection via the TestBI/GPIO/XTamper pin, which functions as an active-high tamper input. When asserted, it triggers immediate zeroization of sensitive keys and logs the event in the TPM's audit log. External tamper switches or sensors can be wired directly to this pin; if unused, it must be tied to GND through a 4.7 kΩ resistor per datasheet guidance.
What is the purpose of the GPIO Express-00 pin on the AT97SC3205-H3M45-10?
The GPIO Express-00 pin on the AT97SC3205-H3M45-10 is mapped to TPM_NV_INDEX_GPIO_00 and serves as a dedicated, NV-backed general-purpose I/O with internal pull-up. It enables platform-specific signaling - such as chassis intrusion detection or secure boot mode selection - with state persistence across power cycles. Default configuration is GPIO input; it also functions as XOR chain output during I/O test mode.
Is the AT97SC3205-H3M45-10 RoHS-compliant and lead-free?
Yes, the AT97SC3205-H3M45-10 is RoHS-compliant and lead-free, as confirmed in the Atmel ordering information section specifying "Lead-free, RoHS" for both 28X1 (TSSOP) and 32M3 (QFN) packages. The 32-pad QFN package used in AT97SC3205-H3M45-10 meets JEDEC MO-220 standards and is compatible with standard Pb-free reflow profiles.
AT97SC3205-H3M45-10 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
AT97SC3205-H3M45-10 FAQ
1.How can I place an order for AT97SC3205-H3M45-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-H3M45-10 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-H3M45-10 reliable?
The price and inventory of AT97SC3205-H3M45-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-H3M45-10 is usually 5 days.
3.What payment methods are accepted for AT97SC3205-H3M45-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-H3M45-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-H3M45-10?
AT97SC3205-H3M45-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-H3M45-10 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-H3M45-10?
For technical support, including AT97SC3205-H3M45-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-H3M45-10 requirements.
6.How does Aetrix verify that AT97SC3205-H3M45-10 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-H3M45-10 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-H3M45-10 meets industry standards.
7.What is the process for return or replacement of AT97SC3205-H3M45-10?
All AT97SC3205-H3M45-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-H3M45-10, 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-H3M45-10 part is unused and in its original packaging.
Return procedure for AT97SC3205-H3M45-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205-H3M45-10 Tags
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