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Microchip Technology AT97SC3205-H3M4520B
- Part No.:
- AT97SC3205-H3M4520B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205-H3M4520B.pdf
- Description:
- PROD FF IND SPI TPM 4X4 32VQFN S
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205-H3M4520B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification with hardware-based RSA crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V, supports SPI up to 45MHz, and targets PC motherboard and embedded security subsystems.
For engineers reviewing the AT97SC3205-H3M4520B datasheet, AT97SC3205-H3M4520B pinout, AT97SC3205-H3M4520B application, or AT97SC3205-H3M4520B equivalent, this page delivers verified package mapping (32-pad QFN), confirmed SPI interface timing, TCG 1.2 compliance status, FIPS-140-2 module certification scope, and GPIO/physical presence pin functions per official summary datasheet.
Technical Context
The AT97SC3205-H3M4520B integrates an AVR 8-bit RISC CPU with dedicated cryptographic hardware including a FIPS-140-2 certified RNG, AES, SHA, and RSA engines. Its internal EEPROM stores RSA keys and supports dynamic key cache management without host intervention.
It implements the TCG PC Client-Specific TPM Interface Specification (TIS) v1.3 over SPI, with PIRQ# interrupt signaling and SPI_RST# reset control. The device enters low-power mode automatically during idle and requires no system-level power management coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification and PC Client-Specific TIS v1.3 - ensures interoperability with BIOS/UEFI and OS security stacks |
| SPI Interface | Up to 45MHz clock rate (24–33MHz typical PC range) - enables high-throughput command/response cycles in trusted boot paths |
| Crypto Certification | FIPS-140-2 Level 2 certified module - validates RNG, HMAC, AES, SHA, and RSA engines for government-grade use |
| Non-Volatile Storage | 2066 bytes user-defined NV space - supports persistent secure variables, platform configuration registers (PCRs), and custom keys |
| Supply Voltage | 3.3V ±5% - matches standard PC motherboard I/O rail; requires 2200–4700pF decoupling capacitors within 5mm of each VCC pin |
| Operating Temperature | −40°C to +85°C industrial grade - qualified for extended thermal environments in embedded servers and edge gateways |
| Package | 32-pad QFN (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-H3M4520B 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 may be left floating or connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires local 2200–4700pF decoupling within 5mm of each pin |
| GND | Ground reference | System ground return; multiple pins support low-impedance return path for crypto operations |
| MISO | SPI data output | Master In Slave Out - delivers TPM command responses; driven only when SPI_CS# is active-low |
| MOSI | SPI data input | Master Out Slave In - receives TPM commands and data; sampled on SPI_CLK rising edge |
| SPI_CLK | SPI clock input | Drives synchronous communication; must be held high during idle to reduce power consumption |
| SPI_CS# | SPI chip select | Active-low enable; initiates transaction and synchronizes MISO/MOSI timing relative to clock |
| SPI_RST# | Hardware reset | Active-low pulse ≥2μs resets internal state; must remain asserted until VCC and SPI_CLK stabilize at power-up |
| PIRQ# | Interrupt request | Active-low open-drain signal indicating pending TPM event; requires external pull-up or tie to GND via 4.7kΩ |
| PP/GPIO | Physical presence indicator | Active-high hardware signal asserting physical presence; internal pull-down; floats if unused |
| GPIO Express-00 | GPIO with NV index mapping | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up; serves as XOR chain output in test mode |
| TestBI/GPIO/XTamper | Multi-function terminal | Configurable as GPIO, tamper detection input (active-high), or disabled test pin; tie to GND via 4.7kΩ if unused |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip turnkey TPM solution | Integrates AVR CPU, crypto engines, EEPROM, RNG, and firmware - eliminates external controller or firmware development effort |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies U.S. federal and DoD procurement requirements for cryptographic modules |
| Hardware asymmetric crypto engine | Dedicated RSA acceleration - offloads key generation and signing from host CPU, reducing boot latency and attack surface |
| Internal EEPROM for RSA keys | Secure non-volatile storage isolated from host memory - prevents key extraction via software memory dumps or DMA attacks |
| 28-pin TSSOP and 32-pad QFN options | 32M3 QFN variant (AT97SC3205-H3M4520B) offers smaller footprint and better thermal performance than TSSOP for dense PCB layouts |
Applications
| PC Motherboard Security Subsystem | Industrial Embedded Gateway |
|---|---|
Use Scenario: Integrated into desktop/laptop motherboard near PCH to provide secure boot, disk encryption key binding, and measured boot log storage. IC Role / Device Role / Timing Role: Dedicated TPM 1.2 security co-processor communicating via SPI with chipset; responds to BIOS/UEFI TCG commands during pre-boot. Use Value: Enables BitLocker, Secure Boot, and attestation services using FIPS-certified crypto engines and tamper-resistant key storage. | Use Scenario: Mounted on industrial gateway PCB to protect firmware updates, authenticate field devices, and store secure credentials for MQTT/TLS connections. IC Role / Device Role / Timing Role: Standalone trusted root-of-trust managing cryptographic operations independently of main application processor. Use Value: Provides hardware-enforced key lifecycle management and 2066-byte NV storage for device identity certificates and policy rules. |
| Server Baseboard Management Controller (BMC) | Medical Edge Device Authentication |
Use Scenario: Embedded alongside BMC SoC to secure out-of-band management interfaces, encrypt IPMI traffic, and attest firmware integrity. IC Role / Device Role / Timing Role: SPI-connected security module providing cryptographic services to BMC firmware; handles TPM2.0-compatible command translation layer. Use Value: Delivers FIPS-140-2 validated RNG and AES for secure session keys, preventing credential leakage across remote management channels. | Use Scenario: Used in FDA-cleared medical edge device to enforce HIPAA-compliant data encryption and audit logging with cryptographically signed timestamps. IC Role / Device Role / Timing Role: Hardware root-of-trust generating and protecting RSA keys used for digital signatures on patient data packets. Use Value: Ensures private key confidentiality via internal EEPROM and meets regulatory requirements through FIPS-140-2 certification scope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM 1.2 security applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9670 | TPM 2.0 compliant; supports SHA-256 and ECC; higher SPI clock (66MHz); different pinout and firmware API | Required for Windows 11 readiness and newer UEFI platforms; not drop-in compatible with legacy TPM 1.2 BIOS | Select for new designs targeting TPM 2.0 mandates; requires BIOS/firmware redesign and validation |
| Nuvoton NPCT750 | TPM 1.2 compliant; integrated ARM Cortex-M0; supports same SPI interface and TIS v1.3; 32-pin QFN package | Direct functional replacement with identical command set; differs in GPIO mapping and tamper detection implementation | Valid alternative for AT97SC3205-H3M4520B in existing TPM 1.2 designs requiring second-source supply |
Compared with Infineon SLB9670 and Nuvoton NPCT750, the AT97SC3205-H3M4520B provides proven TPM 1.2 interoperability with legacy BIOS implementations and includes AVR-based firmware optimized for low-latency command execution, while maintaining full FIPS-140-2 certification coverage for core crypto primitives.
Availability
AT97SC3205-H3M4520B is available at Aetrix Electronics and suitable for PC motherboard security subsystems, industrial embedded gateways, server BMCs, and medical edge devices requiring stable component supply and long-term lifecycle support.
Supply support for AT97SC3205-H3M4520B 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. Microchip is a global semiconductor manufacturer specializing in microcontrollers, analog, and security products.
The AT97SC3205-H3M4520B belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver TCG-compliant hardware root-of-trust for PC, server, and embedded platforms requiring FIPS-validated cryptography and secure key storage.
FAQ
What is the primary compliance standard met by the AT97SC3205-H3M4520B?
The AT97SC3205-H3M4520B is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification and the PC Client-Specific TPM Interface Specification (TIS) Version 1.3. It also holds FIPS-140-2 Level 2 certification covering its RNG, HMAC, AES, SHA, and RSA engines - confirming cryptographic module validation for government and enterprise deployments.
Does the AT97SC3205-H3M4520B support both commercial and industrial temperature ranges?
Yes, the AT97SC3205-H3M4520B is rated for the industrial temperature range of −40°C to +85°C. This rating is explicitly confirmed in the official Atmel ordering information and applies to the 32M3 QFN package variant, making it suitable for deployment in harsh environments such as factory automation controllers and outdoor edge infrastructure where thermal stability is critical.
What package type does the AT97SC3205-H3M4520B use, and what are its mechanical dimensions?
The AT97SC3205-H3M4520B uses the 32-pad Very Thin QFN (32M3) package: 4.0 mm × 4.0 mm × 0.9 mm body size with 0.4 mm lead pitch and an exposed thermal pad tied internally to GND. This package is defined in JEDEC MO-220 and supports automated SMT assembly with standard reflow profiles for lead-free processes.
How does the AT97SC3205-H3M4520B handle power management during idle periods?
The AT97SC3205-H3M4520B automatically enters a low-power state when idle, requiring no host intervention or software control. Power savings are further enhanced by holding SPI_CLK high during inactive periods. Decoupling design is critical: 2200–4700 pF capacitors must be placed within 5 mm of each VCC pin, and a 0.1 μF capacitor at the VCC node within 10 mm of the device.
Is the AT97SC3205-H3M4520B pin-compatible with other Atmel TPM variants like the TSSOP version?
No, the AT97SC3205-H3M4520B (32M3 QFN) is not pin-compatible with the 28-pin thin TSSOP variant (e.g., AT97SC3205-28X1). Pin count, layout, and terminal assignments differ significantly - including dedicated GPIO/XTamper functionality on TestBI/GPIO/XTamper in QFN versus separate TestI/TestBI pins in TSSOP. PCB redesign is required for migration between packages.
AT97SC3205-H3M4520B 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-H3M4520B FAQ
1.How can I place an order for AT97SC3205-H3M4520B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-H3M4520B 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-H3M4520B reliable?
The price and inventory of AT97SC3205-H3M4520B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-H3M4520B is usually 5 days.
3.What payment methods are accepted for AT97SC3205-H3M4520B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-H3M4520B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-H3M4520B?
AT97SC3205-H3M4520B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-H3M4520B 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-H3M4520B?
For technical support, including AT97SC3205-H3M4520B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-H3M4520B requirements.
6.How does Aetrix verify that AT97SC3205-H3M4520B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-H3M4520B 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-H3M4520B meets industry standards.
7.What is the process for return or replacement of AT97SC3205-H3M4520B?
All AT97SC3205-H3M4520B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-H3M4520B, 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-H3M4520B part is unused and in its original packaging.
Return procedure for AT97SC3205-H3M4520B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205-H3M4520B Tags
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