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Microchip Technology AT97SC3205T-H3M4C-20
- Part No.:
- AT97SC3205T-H3M4C-20
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4C-20.pdf
- Description:
- FF IND I2C TPM 4X4 32VQFN SEK
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
AT97SC3205T-H3M4C-20 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400kHz and targets secure boot, platform integrity verification, and key management in embedded computing systems.
For engineers reviewing the AT97SC3205T-H3M4C-20 datasheet, AT97SC3205T-H3M4C-20 pinout, AT97SC3205T-H3M4C-20 application, or AT97SC3205T-H3M4C-20 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for TPM-based system design and supply continuity planning.
Technical Context
The AT97SC3205T-H3M4C-20 implements the full TCG TPM 1.2 specification in silicon, using an on-chip AVR 8-bit RISC CPU to execute firmware-driven cryptographic protocols. Its hardware crypto engine accelerates RSA key generation and signing, SHA-1 hashing, HMAC authentication, and AES encryption without host CPU intervention.
It supports dual I²C modes (100kHz standard / 400kHz fast), includes dedicated physical presence (PP/GPIO) and tamper detection (XTAMPER via TestBI/GPIO/XTAMPER), and enters low-power sleep state automatically during idle periods-recoverable via TWI_Wakeup# pin sequence. Internal EEPROM stores RSA keys and 2066 bytes of user-defined NV data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation per Trusted Computing Group standards, enabling interoperable trusted boot and attestation. |
| Crypto Engines | FIPS-140-2 certified RNG, AES, SHA-1, HMAC, and RSA engines - all hardware-accelerated and isolated from host software control. |
| I²C Interface | 400kHz Fast Mode / 100kHz Standard Mode support with SM_DAT and SM_CLK pins; requires external pull-ups (800Ω on SM_DAT, 1.5kΩ on SM_CLK for 400kHz). |
| Supply Voltage | 3.3V ±10% operation; requires local decoupling: 2200–4700pF capacitor <5mm from each VCC–GND pair, plus 0.1μF at VCC node <10mm from device. |
| NV Storage | 2066 bytes of user-definable non-volatile storage mapped to TPM_NV_INDEX_GPIO_00 and other indices; persistent across power cycles. |
| Operating Temp | -40°C to +85°C industrial range - validated for extended thermal stability in embedded control and network infrastructure applications. |
| Package Type | 32-pad QFN (32M3), 4.0×4.0×0.90 mm body, 0.40 mm pitch, exposed thermal pad tied internally to GND. |
Pinout & Package
AT97SC3205T-H3M4C-20 uses the 32-pad Very Thin QFN (32M3) package: 4.0×4.0 mm body, 0.40 mm pitch, exposed center pad internally connected to GND. Pinout optimized for I²C-based TPM integration with dedicated physical presence, tamper sensing, and low-power wakeup signaling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V main supply; requires strict decoupling within 5 mm of adjacent GND pin to ensure stable crypto operation over lifetime. |
| GND | System Ground Reference | Reference for all digital and analog functions; center thermal pad is internally tied to GND and may be soldered or left floating. |
| SM_DAT | I²C Bidirectional Data Line | Open-drain I²C data line; requires external pull-up (800Ω typical for 400kHz); supports TCG command framing and response payloads. |
| SM_CLK | I²C Clock Input | Master-generated clock input; 50% duty cycle recommended for stability at 400kHz; pull-up value critical (1.5kΩ typical). |
| PP/GPIO | Physical Presence Indicator | Active-high hardware signal indicating physical access; internal pull-down; used to authorize sensitive TPM operations like dictionary attack lockout reset. |
| TestBI/GPIO/XTAMPER | Tamper Detection Input | Configurable as external tamper sensor input (XTAMPER) or GPIO; active-high; must be tied to GND if unused to prevent false triggers. |
| TWI_Wakeup# | Low-Power Recovery Trigger | Active-low signal pair (pins 7 & 22) required to exit deep-sleep mode after TPM_DeepSleep command execution. |
| PIRQ# | Interrupt Request Output | Open-drain interrupt output signaling pending TPM events (e.g., command completion, error condition); requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates CPU, crypto engines, RNG, EEPROM, and I²C interface in one die - eliminates multi-chip timing and security boundary risks. |
| FIPS-140-2 certification | Covers RNG, HMAC, AES, SHA, and RSA modules - enables compliance in government and regulated industry deployments without additional validation effort. |
| Hardware Physical Presence | Dedicated PP/GPIO pin enforces human-authorized critical operations (e.g., clearing owner hierarchy), preventing remote privilege escalation. |
| XTAMPER-capable input | TestBI/GPIO/XTAMPER pin supports external tamper detection circuitry, triggering immediate key zeroization upon enclosure breach or voltage anomaly. |
| Dynamic key cache management | Automatically handles RSA key loading/unloading (TPM_LoadKey2/TPM_FlushSpecific) without host firmware intervention - reduces driver complexity. |
Applications
| Secure Boot Authentication | Platform Integrity Verification |
|---|---|
Use Scenario: Verifying firmware signature before executing bootloader code in industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust by measuring BIOS, bootloader, and OS loader into Platform Configuration Registers (PCRs) and signing PCR values with endorsement key. Use Value: Prevents unauthorized firmware modification; AT97SC3205T-H3M4C-20's FIPS-certified RSA engine ensures cryptographically sound attestation reports for remote audit. | Use Scenario: Detecting runtime memory corruption or unauthorized process injection in network appliance control plane. IC Role / Device Role / Timing Role: TPM monitors system state changes via periodic PCR extension and responds to remote attestation requests using SHA-1 and HMAC engines. Use Value: Enables continuous trust assessment; AT97SC3205T-H3M4C-20's hardware-accelerated SHA-1 ensures sub-millisecond hash updates without host CPU load. |
| Hardware-Based Key Management | Secure Remote Attestation |
Use Scenario: Storing and protecting TLS private keys for HTTPS termination in edge servers. IC Role / Device Role / Timing Role: TPM serves as secure key vault: RSA keys generated and stored exclusively inside AT97SC3205T-H3M4C-20 EEPROM; never exposed to host memory. Use Value: Mitigates key extraction attacks; AT97SC3205T-H3M4C-20's internal crypto engine performs signing/decryption on-die, eliminating plaintext key exposure. | Use Scenario: Proving device identity and configuration state to cloud management services during onboarding. IC Role / Device Role / Timing Role: TPM generates digitally signed quotes containing PCR values and nonce, authenticated using endorsement key bound to AT97SC3205T-H3M4C-20 hardware. Use Value: Enables zero-touch provisioning; AT97SC3205T-H3M4C-20's FIPS-140-2 RNG guarantees unpredictable nonces and key material for unforgeable attestations. |
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 |
|---|---|---|---|
| ST33TPHF2XZ | 32-pin QFN, 3.3V, TCG TPM 1.2 compliant; includes additional SPI interface alongside I²C; lacks FIPS-140-2 certification for full module. | Supports dual-interface host connectivity but requires separate SPI routing; no FIPS validation reduces suitability for regulated environments. | Select when SPI host interface is mandatory and FIPS certification is not required for deployment. |
| SLB9670 | 32-pin QFN, 3.3V, TCG TPM 2.0 compliant; backward-compatible with TPM 1.2 commands; includes enhanced SHA-256 and ECC support. | Enables future-proofing for TPM 2.0 features while maintaining legacy compatibility; higher crypto agility but larger firmware footprint. | Select when roadmap includes migration to TPM 2.0 and SHA-256/ECC-based attestation is needed. |
Compared with ST33TPHF2XZ and SLB9670, the AT97SC3205T-H3M4C-20 offers verified FIPS-140-2 certification for its full crypto suite and proven industrial temperature reliability, making it optimal for deployments where regulatory compliance and long-term environmental robustness are primary selection criteria.
Availability
AT97SC3205T-H3M4C-20 is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity verification, and hardware-based key management requiring stable component supply across industrial lifecycle durations.
Supply support for AT97SC3205T-H3M4C-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 full support for legacy Atmel security products including the AT97SC series. The company specializes in microcontrollers, analog, and security ICs for industrial, automotive, and communications markets.
The AT97SC3205T-H3M4C-20 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems needing hardware-rooted trust without external co-processors or discrete crypto components.
FAQ
What is the operating voltage range for the AT97SC3205T-H3M4C-20?
The AT97SC3205T-H3M4C-20 operates at a nominal supply voltage of 3.3V with ±10% tolerance (2.97V to 3.63V). Stable regulation and proper decoupling - including 2200–4700pF capacitors placed within 5 mm of each VCC–GND pair - are mandatory to maintain FIPS-140-2 certified RNG and crypto engine reliability across the full -40°C to +85°C industrial temperature range.
Does the AT97SC3205T-H3M4C-20 support both I²C standard and fast modes?
Yes, the AT97SC3205T-H3M4C-20 supports I²C Standard Mode (100kHz) and Fast Mode (400kHz) via SM_DAT and SM_CLK pins. For reliable 400kHz operation, Atmel specifies 800Ω pull-up on SM_DAT and 1.5kΩ on SM_CLK, with emphasis on achieving near 50% duty cycle on SM_CLK to minimize communication errors during TCG command exchange.
How is physical presence enforced on the AT97SC3205T-H3M4C-20?
Physical presence is enforced through the dedicated PP/GPIO pin on the AT97SC3205T-H3M4C-20, which defaults to active-high input with internal pull-down. When asserted, it authorizes privileged operations such as clearing the owner hierarchy or disabling dictionary attack protection - ensuring that high-risk TPM actions require direct hardware-level confirmation rather than software-only initiation.
What NV storage capacity does the AT97SC3205T-H3M4C-20 provide for user data?
The AT97SC3205T-H3M4C-20 provides 2066 bytes of non-volatile user storage, allocated across programmable NV indices including TPM_NV_INDEX_GPIO_00. This space persists across power cycles and is accessible only via authenticated TCG commands, enabling secure storage of configuration tokens, license keys, or device-specific identifiers without exposing them to host memory.
Is the AT97SC3205T-H3M4C-20 FIPS-140-2 certified, and what modules are covered?
Yes, the AT97SC3205T-H3M4C-20 is FIPS-140-2 Level 2 certified for its integrated RNG, HMAC, AES, SHA, and RSA engines. Certification covers the complete cryptographic module - including entropy source, key generation, and algorithm execution - as implemented in hardware and firmware, enabling compliance in U.S. federal and other regulated deployments without requiring additional third-party validation of the AT97SC3205T-H3M4C-20 itself.
AT97SC3205T-H3M4C-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:
- I2C
- 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)
AT97SC3205T-H3M4C-20 FAQ
1.How can I place an order for AT97SC3205T-H3M4C-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4C-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 AT97SC3205T-H3M4C-20 reliable?
The price and inventory of AT97SC3205T-H3M4C-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4C-20 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4C-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4C-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4C-20?
AT97SC3205T-H3M4C-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4C-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 AT97SC3205T-H3M4C-20?
For technical support, including AT97SC3205T-H3M4C-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4C-20 requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4C-20 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4C-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 AT97SC3205T-H3M4C-20 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4C-20?
All AT97SC3205T-H3M4C-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4C-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 AT97SC3205T-H3M4C-20 part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4C-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M4C-20 Tags
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