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Microchip Technology AT97SC3205-H3M4500B
- Part No.:
- AT97SC3205-H3M4500B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205-H3M4500B.pdf
- Description:
- PRODFF IND SPI TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205-H3M4500B from Microchip (formerly Atmel) is a single-chip Trusted Platform Module (TPM) implementing TCG TPM 1.2 and PC Client-Specific TIS 1.3 specifications. It integrates an AVR RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG, HMAC/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with SPI interface up to 45MHz and targets PC motherboard and embedded security subsystems.
For engineers reviewing the AT97SC3205-H3M4500B datasheet, AT97SC3205-H3M4500B pinout, AT97SC3205-H3M4500B application, or AT97SC3205-H3M4500B equivalent, this page delivers verified package mapping (32-pad QFN), confirmed SPI-based TPM system integration, TCG compliance scope, FIPS-140-2 module certification coverage, and real-world GPIO and tamper signaling behavior per official summary datasheet.
Technical Context
The AT97SC3205-H3M4500B implements a full TCG-compliant TPM stack in silicon, including dedicated hardware for RSA key generation, SHA-1 hashing, HMAC authentication, and AES encryption - all validated under FIPS-140-2 Level 2. Its internal EEPROM stores RSA keys and supports dynamic key cache management without host intervention.
It uses an 8-bit AVR RISC CPU for firmware execution and features a configurable GPIO architecture with physical presence (PP/GPIO), tamper detection (TestBI/GPIO/XTamper), and express GPIO indexing (GPIO Express-00). The SPI interface operates at up to 45MHz but is typically used between 24–33MHz in PC platforms per TCG requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 and PC Client-Specific TIS 1.3 - enables interoperability with BIOS, OS drivers, and enterprise security stacks. |
| FIPS Certification | FIPS-140-2 Level 2 certified module - covers RNG, HMAC, AES, SHA, and RSA engines for cryptographic validation in regulated environments. |
| SPI Interface Speed | Up to 45MHz clock rate - supports high-throughput command/response cycles; typical PC use at 24–33MHz ensures timing margin and noise resilience. |
| Supply Voltage | 3.3V ±10% - requires tight decoupling: 2200–4700pF caps within 5mm of each VCC pin and 0.1μF at VCC node <10mm from chip. |
| Nonvolatile Storage | 2066 bytes user-defined NV space - persists configuration, credentials, and policy data across power cycles without external memory. |
| Operating Temperature | −40°C to +85°C industrial range - qualified for extended thermal operation in embedded computing and server board applications. |
| Package Type | 32-pad QFN (32M3), 4.0 × 4.0 × 0.9 mm, 0.4 mm pitch - exposes GND center pad for thermal and EMI performance; RoHS-compliant lead-free finish. |
Pinout & Package
AT97SC3205-H3M4500B uses the 32-pad QFN (32M3) package: 4.0 × 4.0 × 0.9 mm body, 0.4 mm pitch, exposed GND center pad internally tied to ground. Pin 1 identifier located at top-left corner; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires local 2200–4700pF decoupling ≤5mm from pin and global 0.1μF cap ≤10mm from chip. |
| GND | Ground reference | System ground return; includes exposed center pad tied internally to GND for thermal dissipation and noise reduction. |
| MISO | SPI slave data output | Drives SPI master MISO line; open-drain compatible; must be pulled up externally if shared bus topology used. |
| MOSI | SPI slave data input | Receives SPI master MOSI data; sampled on rising edge of SPI_CLK; no internal pull-up/down. |
| SPI_CS# | SPI chip select | Active-low enable; deassertion halts transaction and places device in low-power idle state automatically. |
| SPI_CLK | SPI clock input | Driven by host; high-idle polarity; must be held high during idle to minimize power consumption. |
| PIRQ# | SPI interrupt request | Active-low open-drain output; asserts when TPM requires host attention (e.g., command completion); requires external pull-up. |
| SPI_RST# | SPI reset input | Active-low asynchronous reset; ≥2μs pulse required; must remain asserted until VCC and SPI_CLK stabilize at power-up. |
| PP/GPIO | Physical presence / GPIO | Hardware PP indicator (active-high); also configurable as GPIO with internal pull-down; floats if unused. |
| TestBI/GPIO/XTamper | Tamper detect / GPIO | Configurable as external tamper input (active-high) or GPIO; tied to ground via 4.7kΩ if unused per design guidance. |
| GPIO Express-00 | Indexed GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up enabled; defaults to input; floats if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | Offloads RSA key generation and signing operations from host CPU, reducing latency and eliminating software-side private key exposure. |
| FIPS-140-2 Certified RNG | Provides cryptographically secure random numbers for key derivation and protocol nonces, validated to NIST SP 800-90A standards. |
| Integrated AVR RISC Core | Executes full TPM firmware stack independently; eliminates need for external microcontroller or co-processor in security subsystem design. |
| Internal EEPROM Key Storage | Persists RSA keys in tamper-resistant nonvolatile memory; prevents extraction via logical attacks or memory dumps. |
| GPIO Express Indexing | Enables direct NV-indexed access to GPIO state (e.g., TPM_NV_INDEX_GPIO_00), simplifying firmware-controlled hardware signaling in BIOS/UEFI. |
Applications
| PC Motherboard Security | Industrial Embedded Control |
|---|---|
|
Use Scenario: Integration into desktop/laptop motherboard BIOS to enable BitLocker, Secure Boot, and measured boot attestation. IC Role / Device Role / Timing Role: Dedicated TPM 1.2 security coprocessor handling cryptographic operations, platform integrity measurement, and sealed storage. Use Value: Enables hardware-rooted trust chain with FIPS-140-2 certified crypto engines, satisfying enterprise IT security policies and regulatory compliance (e.g., HIPAA, GDPR). |
Use Scenario: Deployment in programmable logic controllers (PLCs) and HMIs requiring secure firmware updates and device identity binding. IC Role / Device Role / Timing Role: Root-of-trust anchor providing secure key storage, HMAC-based update verification, and tamper-evident boot integrity checks. Use Value: Prevents unauthorized firmware modification via hardware-enforced signature validation and persistent NV credential storage across reboots. |
| Server Board Trusted Boot | Medical Device Authentication |
|
Use Scenario: Use in rack-mounted server baseboard management controllers (BMC) to support remote attestation and secure provisioning. IC Role / Device Role / Timing Role: TPM 1.2 endpoint for IPMI-over-LAN secure channel establishment and hardware-backed certificate issuance. Use Value: Delivers verifiable platform configuration data (PCRs) to cloud management systems, enabling zero-trust infrastructure validation. |
Use Scenario: Integration into FDA-cleared diagnostic imaging equipment to enforce secure communication with PACS servers and prevent cloning. IC Role / Device Role / Timing Role: Cryptographic identity anchor storing device-specific ECDSA keys and performing TLS handshake acceleration. Use Value: Meets IEC 62304 and UL 62368-1 requirements for cryptographic integrity, with FIPS-140-2 certified engines supporting audit-ready security logs. |
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 | Same TCG TPM 1.2 + TIS 1.3 compliance; 32-pin QFN; 3.3V; but uses ARM-based core and lacks AVR-specific GPIO Express indexing. | Supports identical PC client BIOS integration but requires different driver stack; no native TPM_NV_INDEX_GPIO_00 mapping. | Select when ARM ecosystem alignment or Infineon's long-term automotive qualification path is prioritized over AVR firmware extensibility. |
| NXP PTFTPM20 | TPM 2.0 compliant (not TPM 1.2); supports SHA-256 and ECC; same 3.3V/32-QFN form factor; FIPS-140-2 Level 3 certified. | Enables next-gen attestation and algorithm agility but requires BIOS/OS upgrade to TPM 2.0 stack; not backward-compatible with legacy TPM 1.2 deployments. | Select only for new designs targeting TPM 2.0 mandates; not suitable as drop-in replacement for AT97SC3205-H3M4500B in existing TPM 1.2 systems. |
Compared with Infineon SLB9665TT2.0 and NXP PTFTPM20, the AT97SC3205-H3M4500B offers unique AVR-based firmware flexibility and GPIO Express indexing for BIOS-level hardware signaling, while maintaining strict TPM 1.2 interoperability and FIPS-140-2 Level 2 certification - making it optimal for cost-sensitive, legacy-compatible PC and industrial control platforms.
Availability
AT97SC3205-H3M4500B is available at Aetrix Electronics and suitable for PC motherboard security, industrial embedded control, and server board trusted boot applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT97SC3205-H3M4500B 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 TPM solutions rooted in TCG standards and FIPS validation.
The AT97SC3205-H3M4500B belongs to Atmel's legacy TPM product line designed specifically for PC client and embedded systems requiring hardware-rooted trust, cryptographic acceleration, and tamper-aware secure storage.
FAQ
What TCG specifications does the AT97SC3205-H3M4500B implement?
The AT97SC3205-H3M4500B implements Trusted Computing Group (TCG) TPM Version 1.2 Specification and PC Client-Specific TPM Interface Specification (TIS) Version 1.3. It does not support TPM 2.0. These specifications define command sets, data structures, and interface protocols required for interoperability with BIOS, UEFI, and operating system security stacks such as Windows BitLocker and Linux tpm-tools. The AT97SC3205-H3M4500B fully complies with both documents as verified in the official Atmel-8884AS datasheet summary.
Does the AT97SC3205-H3M4500B support FIPS-140-2 certification?
Yes, the AT97SC3205-H3M4500B is a FIPS-140-2 Level 2 certified module. Certification explicitly covers its hardware Random Number Generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This validation ensures conformance to NIST SP 800-22 and SP 800-90A standards for randomness and algorithm implementation. The AT97SC3205-H3M4500B's FIPS certificate applies to the complete integrated module - not just individual blocks - and is documented in the Atmel-8884AS datasheet summary.
What is the function of the TestBI/GPIO/XTamper pin on the AT97SC3205-H3M4500B?
The TestBI/GPIO/XTamper pin on the AT97SC3205-H3M4500B serves three roles: manufacturing test input (disabled post-production), general-purpose GPIO, or active-high external tamper detection input. In tamper mode, it signals physical intrusion events to the TPM firmware. When unused, Atmel specifies tying it to ground via a 4.7kΩ resistor. Its dual GPIO/tamper functionality is detailed in the "Atmel Specific TPM Commands Reference Guide" and confirmed in the AT97SC3205-H3M4500B pin description table.
What SPI clock frequency range is supported by the AT97SC3205-H3M4500B?
The AT97SC3205-H3M4500B supports SPI clock frequencies up to 45MHz, but the typical operating range in PC platforms is 24–33MHz per TCG requirements and Atmel's design guidance. This range balances throughput and signal integrity, minimizing timing skew and noise susceptibility. The AT97SC3205-H3M4500B's SPI interface remains fully functional across the full 0–45MHz range, though system-level stability must be validated per board layout and voltage margin.
How is nonvolatile storage allocated in the AT97SC3205-H3M4500B?
The AT97SC3205-H3M4500B provides 2066 bytes of user-defined nonvolatile (NV) storage, separate from internal RSA key storage. This space is accessible via TCG-defined NV commands (e.g., TPM_NV_Write, TPM_NV_Read) and persists across power cycles. It is implemented in on-chip EEPROM and managed by the TPM firmware - no host-side wear leveling or erase management is required. This NV allocation is explicitly stated in the AT97SC3205-H3M4500B datasheet summary and used for policy data, counters, and custom credentials.
AT97SC3205-H3M4500B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- 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-H3M4500B FAQ
1.How can I place an order for AT97SC3205-H3M4500B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-H3M4500B 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-H3M4500B reliable?
The price and inventory of AT97SC3205-H3M4500B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-H3M4500B is usually 5 days.
3.What payment methods are accepted for AT97SC3205-H3M4500B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-H3M4500B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-H3M4500B?
AT97SC3205-H3M4500B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-H3M4500B 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-H3M4500B?
For technical support, including AT97SC3205-H3M4500B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-H3M4500B requirements.
6.How does Aetrix verify that AT97SC3205-H3M4500B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-H3M4500B 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-H3M4500B meets industry standards.
7.What is the process for return or replacement of AT97SC3205-H3M4500B?
All AT97SC3205-H3M4500B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-H3M4500B, 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-H3M4500B part is unused and in its original packaging.
Return procedure for AT97SC3205-H3M4500B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205-H3M4500B Tags
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CYPD3175-24LQXQ
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SLB9672VU20FW1523XTMA1
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SLB9670VQ20FW785XTMA1
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AT97SC3204-U2A1A-20
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9672AU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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