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Microchip Technology AT97SC3205T-G3M46-00
- Part No.:
- AT97SC3205T-G3M46-00
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M46-00.pdf
- Description:
- FF COM I2C TPM 4X4 32VQFN CEK
- Quantity:
- Payment:
- Shipping:
Inventory:1,596
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Product details
Overview
AT97SC3205T-G3M46-00 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 via I²C interface and targets secure boot, platform authentication, and key management in embedded computing systems.
For engineers reviewing the AT97SC3205T-G3M46-00 datasheet, AT97SC3205T-G3M46-00 pinout, AT97SC3205T-G3M46-00 application, or AT97SC3205T-G3M46-00 equivalent, this page delivers verified package mapping (32-pad QFN), confirmed I²C timing (400 kHz Fast Mode), FIPS-140-2 module certification scope, GPIO-Express-00 NV index assignment, and industrial temperature support (–40°C to +85°C).
Technical Context
The AT97SC3205T-G3M46-00 implements the full TCG TPM 1.2 specification stack in silicon, with dedicated hardware acceleration for RSA key generation, HMAC-SHA-1 signing, and AES encryption. Its internal EEPROM stores RSA keys and supports dynamic cache management via TPM_FlushSpecific and TPM_LoadKey2 commands without host intervention.
Security architecture includes physical tamper detection (XTAMPER pin), low-power deep-sleep recovery via TWI_Wakeup# dual-pin activation, and hardware-enforced isolation between crypto engines, SRAM, and NV storage. The device uses a certified Pseudo-Random Number Generator compliant with FIPS-140-2 Annex C for all cryptographic operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Fully implements TPM 1.2 specification - enables standardized platform attestation and sealed storage across OS and firmware layers. |
| I²C Interface Speed | 400 kHz Fast Mode / 100 kHz Standard Mode - supports high-throughput command/response cycles with verified 800 Ω SM_DAT and 1.5 kΩ SM_CLK pull-up values. |
| Supply Voltage | 3.3 V ±10% - requires decoupling with 2200–4700 pF capacitors within 5 mm of each VCC pin and 0.1 μF at VCC node junction. |
| NV User Storage | 2066 bytes - allocated as persistent, write-limited space for customer-defined keys, certificates, or policy data indexed via TPM_NV_INDEX_GPIO_00. |
| Crypto Certification | FIPS-140-2 Level 2 certified module - covers RNG, HMAC, AES-128, SHA-1, and RSA-2048 engines, validating cryptographic integrity for government and enterprise use. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments with no derating required; LRESET# pulse width ≥2 μs ensures reliable power-on initialization. |
Pinout & Package
AT97SC3205T-G3M46-00 is packaged in a 32-pad Very Thin QFN (32M3) measuring 4.0 × 4.0 × 0.90 mm with 0.40 mm pitch and exposed thermal pad tied internally to GND. Pinout reflects functional I²C, GPIO, and security control signals with defined biasing requirements for unused pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3 V main supply; requires localized 2200–4700 pF decoupling ≤5 mm from each VCC pin and 0.1 μF at VCC node junction. |
| GND | System Ground Reference | Reference for all analog/digital circuits; substrate center pad is internally connected to GND and may be left floating or tied externally. |
| SM_DAT / SM_CLK | I²C Bidirectional Data / Clock | Supports 400 kHz Fast Mode; SM_DAT pull-up = 800 Ω, SM_CLK pull-up = 1.5 kΩ recommended for stable timing at rated speed. |
| GPIO-Express-00 | Assigned NV Index I/O | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up enabled; must remain floating if unused to preserve default input state. |
| PP/GPIO | Hardware Physical Presence Indicator | Active-high signal indicating physical presence assertion; internal pull-down enabled; floating when unused. |
| TWI_Wakeup# | Low-Power Sleep Recovery Trigger | Dual-pin active-low wakeup mechanism for TPM_DeepSleep mode; both pins must be pulsed low to exit sleep state. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 implementation | Eliminates external firmware dependencies and reduces BOM count by integrating AVR CPU, crypto engines, EEPROM, and RNG into one die. |
| FIPS-140-2 Level 2 certification | Validates RNG entropy quality, AES/SHA/RSA algorithm correctness, and physical security countermeasures - satisfies U.S. federal and DoD procurement requirements. |
| Hardware asymmetric crypto engine | Accelerates RSA-2048 key generation and signing offload from host processor, reducing latency and preventing software-side side-channel exposure. |
| Internal EEPROM for RSA keys | Stores multiple private keys with hardware-enforced access control and zero-volatility retention - no external secure element needed. |
| XTAMPER-capable GPIO | TestBI/GPIO/XTAMPER pin provides tamper event detection via external switch or sensor; triggers immediate key erasure upon violation per TCG spec. |
Applications
| Secure Boot Authentication | Platform Integrity Measurement |
|---|---|
Use Scenario: Verifying firmware signature before loading bootloader in industrial gateways. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust authenticates signed firmware images using stored RSA public keys and SHA-1 hashes. Use Value: Prevents unauthorized firmware execution by enforcing cryptographic chain-of-trust from power-on reset through OS load. | Use Scenario: Logging BIOS, UEFI, and hypervisor configuration changes in server rack controllers. IC Role / Device Role / Timing Role: Measures hash digests of critical firmware components into Platform Configuration Registers (PCRs) during boot sequence. Use Value: Enables remote attestation of runtime integrity - deviations trigger alerts or deny network access via TCG-compliant protocols. |
| Hardware-Bound Key Storage | Physical Presence Enforcement |
Use Scenario: Storing TLS private keys for encrypted telemetry in edge AI cameras. IC Role / Device Role / Timing Role: Stores 2066-byte NV user data including ECDSA keys bound to device identity and protected by TPM authorization policies. Use Value: Keys cannot be extracted or cloned - even with physical access - due to hardware-enforced read protection and erase-on-tamper. | Use Scenario: Requiring manual button press before enabling firmware update in medical diagnostic equipment. IC Role / Device Role / Timing Role: PP/GPIO pin asserts high only when physical presence switch is closed; TPM enforces policy requiring this signal before sensitive commands. Use Value: Mitigates remote exploitation by enforcing human-in-the-loop approval for privileged operations per TCG Physical Presence spec. |
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 |
|---|---|---|---|
| ST33TPHF2Xx (STMicroelectronics) | TPM 2.0 compliant; supports SHA-256 and ECC; 3.3 V operation; 32-pin QFN package. | Required for new designs targeting Windows 11 or Linux kernel 5.12+ where TPM 2.0 is mandated. | Select ST33TPHF2Xx when upgrading to TPM 2.0 compliance is required; not drop-in compatible due to protocol and command set differences. |
| Infineon SLB9670 | TPM 2.0 compliant; FIPS-140-2 Level 3 certified; supports RSA-3072 and ECC NIST P-384; 32-pin QFN. | Higher assurance level required for defense or financial sector deployments with extended crypto agility. | Choose SLB9670 for Level 3 certification needs or when longer key lengths and post-quantum readiness planning are prioritized. |
Compared with ST33TPHF2Xx and SLB9670, the AT97SC3205T-G3M46-00 provides validated TPM 1.2 functionality with lower integration overhead and proven field reliability in legacy industrial systems, but lacks TPM 2.0 features like algorithm agility and enhanced PCR hierarchy.
Availability
AT97SC3205T-G3M46-00 is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity measurement, hardware-bound key storage, and physical presence enforcement requiring stable component supply across industrial lifecycle durations.
Supply support for AT97SC3205T-G3M46-00 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 AT97SC3205T series.
The AT97SC3205T product line delivers turnkey TPM 1.2 modules for embedded platforms needing hardware-rooted trust, with focus on industrial control, networking infrastructure, and medical devices requiring FIPS-140-2 validation.
FAQ
What is the primary security function of the AT97SC3205T-G3M46-00?
The AT97SC3205T-G3M46-00 serves as a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification. Its core function is to provide hardware-rooted trust for secure boot, platform attestation, and protected key storage. It integrates an AVR RISC CPU, FIPS-140-2 certified RNG, AES, SHA-1, and RSA engines, and 2066-byte NV user storage - all within a single 32-pad QFN package. The AT97SC3205T-G3M46-00 enables cryptographic operations independent of host software, mitigating firmware-level attacks.
Does the AT97SC3205T-G3M46-00 support TPM 2.0?
No, the AT97SC3205T-G3M46-00 implements only the TCG TPM 1.2 specification and does not support TPM 2.0 features such as SHA-256, ECC algorithms, or hierarchical key structures. It is designed for systems requiring TPM 1.2 compliance - for example, legacy Windows 10 IoT Enterprise or industrial firmware stacks that do not mandate TPM 2.0. Migration to TPM 2.0 requires hardware replacement with certified alternatives like ST33TPHF2Xx or Infineon SLB9670. The AT97SC3205T-G3M46-00 remains fully functional within its specified 1.2 scope.
What are the I²C interface requirements for reliable communication with the AT97SC3205T-G3M46-00?
The AT97SC3205T-G3M46-00 supports I²C at 400 kHz Fast Mode and 100 kHz Standard Mode. For stable 400 kHz operation, SM_DAT requires an 800 Ω pull-up resistor and SM_CLK requires a 1.5 kΩ pull-up resistor. Signal duty cycle should approach 50% to maximize timing margin. Decoupling is critical: place 2200–4700 pF capacitors within 5 mm of each VCC pin and a 0.1 μF capacitor at the VCC node junction. The AT97SC3205T-G3M46-00 does not require external clock or reset circuitry beyond standard I²C bus design rules.
How is the GPIO-Express-00 pin used in the AT97SC3205T-G3M46-00?
The GPIO-Express-00 pin on the AT97SC3205T-G3M46-00 is mapped to TPM_NV_INDEX_GPIO_00 and serves as a dedicated NV-indexed general-purpose I/O. It features an internal pull-up resistor and defaults to input mode. When configured, it allows user-defined data (e.g., calibration flags or policy bits) to be stored in the 2066-byte NV space and accessed via TPM_NV_Read/Write commands. If unused, the pin must remain floating to preserve its default input state - tying it high or low would conflict with internal biasing. This behavior is explicitly defined in the AT97SC3205T-G3M46-00 pin description table.
What temperature range is qualified for the AT97SC3205T-G3M46-00?
The AT97SC3205T-G3M46-00 is qualified for industrial temperature operation from –40°C to +85°C. This rating applies to the specific part variant indicated by the "G3M46" suffix, which corresponds to the 32-pad QFN (32M3) package with industrial-grade screening. The device requires no derating or special thermal management across this range. Power-on reset timing (LRESET# minimum pulse width of 2 μs) and I²C timing parameters remain valid throughout the full industrial range. The AT97SC3205T-G3M46-00 meets JEDEC JESD22-A104 reliability standards for this temperature grade.
AT97SC3205T-G3M46-00 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- 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-G3M46-00 FAQ
1.How can I place an order for AT97SC3205T-G3M46-00 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M46-00 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-G3M46-00 reliable?
The price and inventory of AT97SC3205T-G3M46-00 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M46-00 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M46-00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M46-00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M46-00?
AT97SC3205T-G3M46-00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M46-00 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-G3M46-00?
For technical support, including AT97SC3205T-G3M46-00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M46-00 requirements.
6.How does Aetrix verify that AT97SC3205T-G3M46-00 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M46-00 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-G3M46-00 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M46-00?
All AT97SC3205T-G3M46-00 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M46-00, 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-G3M46-00 part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M46-00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M46-00 Tags
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