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Microchip Technology AT97SC3205T-G3M4B10B
- Part No.:
- AT97SC3205T-G3M4B10B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4B10B.pdf
- Description:
- PROD STD COM I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,769
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Product details
Overview
AT97SC3205T-G3M4B10B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware RSA crypto engine, FIPS-140-2 certified RNG/AES/SHA/HMAC engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400 kHz and supports industrial temperature range (−40°C to +85°C). Used in embedded systems requiring secure boot, key attestation, and platform integrity verification.
For engineers reviewing the AT97SC3205T-G3M4B10B datasheet, AT97SC3205T-G3M4B10B pinout, AT97SC3205T-G3M4B10B application, or AT97SC3205T-G3M4B10B equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed GPIO-Express-00 and PP/GPIO roles, package-specific pin mapping for 32-pin QFN, and real-world TPM deployment guidance for server, industrial controller, and IoT edge device designs.
Technical Context
The AT97SC3205T-G3M4B10B implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, session management, and cryptographic acceleration via dedicated hardware engines-not software emulation. Its internal EEPROM stores RSA keys securely, while the FIPS-140-2 certified RNG feeds both key generation and protocol randomness requirements.
It uses a single-wire I²C interface (SM_DAT/SM_CLK) with strict pull-up recommendations (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK) and requires precise reset timing (≥2 μs LRESET# pulse). The device enters low-power sleep autonomously and recovers only upon dual TWI_Wakeup# assertion-ensuring deterministic power-state control in host systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation per TCG Main Spec Parts 1–3; enables standardized attestation, sealing, and platform configuration validation. |
| I²C Interface Speed | 400 kHz Fast Mode (with verified 800 Ω SM_DAT / 1.5 kΩ SM_CLK pull-ups); supports high-throughput command/response cycles without bus arbitration loss. |
| Supply Voltage | 3.3 V ±5%; requires local decoupling: 2200–4700 pF caps <5 mm from each VCC–GND pair plus 0.1 µF at VCC node <10 mm from device. |
| NV Storage Capacity | 2066 bytes of user-defined non-volatile storage (TPM_NV_INDEX space); persists across power cycles and supports secure write-locking. |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC-SHA-1, AES-128, and RSA-2048 hardware accelerators; offloads host CPU and prevents software-side key exposure. |
| Operating Temperature | −40°C to +85°C industrial grade; validated for continuous operation in fanless industrial controllers and network infrastructure equipment. |
| Package Type | 32-pad QFN (32M3), 4.0 × 4.0 × 0.90 mm body, 0.40 mm pitch; exposes GND center pad for thermal and EMI performance; RoHS-compliant, lead-free. |
Pinout & Package
AT97SC3205T-G3M4B10B is packaged in a 32-pad Very Thin QFN (32M3) with exposed GND center pad. Pin assignments are defined per Atmel-8883AS-TPM-AT97SC3205T-Datasheet-Summary_022014, Table 1-2 and Figure 1-1 (QFN layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3 V main supply; requires dedicated high-frequency decoupling (2200–4700 pF) adjacent to each VCC pin and bulk 0.1 µF near VCC node. |
| GND | System Ground Reference | Multiple GND pins including exposed center pad; all must be connected to system ground plane for noise immunity and thermal dissipation. |
| SM_DAT / SM_CLK | I²C Bidirectional Data / Clock | Open-drain interface; requires external pull-ups (800 Ω / 1.5 kΩ) and 50% duty-cycle clock for stable 400 kHz operation. |
| LRESET# | Active-Low Hardware Reset | Asynchronous reset input; ≥2 μs pulse required; must remain asserted until VCC stabilizes at power-up. |
| PP/GPIO | Physical Presence Indicator / GPIO | Hardware physical presence signal (active-high); also configurable as general-purpose input with internal pull-down; float if unused. |
| GPIO-Express-00 | TPM-NV Mapped GPIO | Maps directly to TPM_NV_INDEX_GPIO_00; internal pull-up; used for secure state signaling (e.g., tamper detection output); float if unused. |
| TWI_Wakeup# | Low-Power Sleep Recovery | Two-pin wake mechanism: both pins must be pulsed low to exit deep-sleep mode; critical for energy-constrained edge devices. |
| PIRQ# | Interrupt Request Output | Open-drain interrupt signal to host processor; active-low; requires external pull-up; signals command completion or error events. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 Turnkey Solution | Integrates CPU (AVR®), crypto engines, RNG, EEPROM, and I²C interface in one die-eliminates multi-chip design complexity and interconnect vulnerabilities. |
| FIPS-140-2 Certified Crypto Subsystem | Certification covers RNG, HMAC, AES, SHA, and RSA engines-enables compliance in regulated environments (e.g., government, finance, healthcare) without additional validation effort. |
| Secure Internal Key Management | Dedicated EEPROM stores RSA keys with hardware-enforced access controls; no software-managed key buffers exposed to memory attacks. |
| Hardware Physical Presence Support | PP/GPIO pin provides tamper-evident hardware confirmation of administrative action-required for TCG-compliant BIOS/UEFI firmware updates and key revocation. |
| Low-Power Deep Sleep with Dual Wake Control | Autonomous sleep entry and dual-pin wake (TWI_Wakeup#) reduce average current draw in always-on IoT gateways while maintaining instant responsiveness to host commands. |
Applications
| Server Platform Integrity | Industrial PLC Secure Boot |
|---|---|
Use Scenario: Verifying firmware authenticity and measuring boot sequence integrity in rack-mounted servers before OS load. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust IC performing PCR extension, sealed storage, and remote attestation via I²C host interface. Use Value: Prevents unauthorized firmware modification by cryptographically binding measurements to hardware identity; enables data center operators to detect compromised nodes remotely. | Use Scenario: Securing firmware update process in programmable logic controllers deployed in factory automation systems. IC Role / Device Role / Timing Role: Hardware-enforced physical presence verification (PP/GPIO) combined with signed firmware validation and key sealing. Use Value: Ensures only authorized engineers can initiate field updates-prevents malicious reprogramming via network interfaces or USB ports. |
| IoT Edge Device Identity | Medical Device Data Provenance |
Use Scenario: Establishing unique, cryptographically verifiable identity for wireless sensor nodes in smart building networks. IC Role / Device Role / Timing Role: Generates and stores device-specific ECDSA keys; signs sensor telemetry using hardware-accelerated SHA-256 and RSA-2048. Use Value: Enables zero-touch provisioning and mutual TLS authentication without exposing private keys to host MCU memory or flash. | Use Scenario: Logging time-stamped, tamper-proof audit trails for diagnostic imaging equipment handling HIPAA-regulated patient data. IC Role / Device Role / Timing Role: TPM-resident NV storage (2066 bytes) holds immutable event logs; hardware RNG seeds digital signatures for log entries. Use Value: Meets FDA 21 CFR Part 11 requirements for electronic records and signatures by guaranteeing log integrity and origin authenticity. |
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 TPM 1.2 compliance, SPI interface (not I²C); 32-pin QFN; FIPS-140-2 Level 2 certified; no integrated AVR core-relies on host for command dispatch. | Requires SPI-capable host MCU; lacks GPIO-Express-00 and PP/GPIO hardware presence logic; deeper integration needed for physical presence workflows. | Select when host already uses SPI peripherals and physical presence is managed externally; verify SPI timing margins match system clock tree. |
| Nuvoton NPCT750AAX1G | TPM 2.0 compliant (not 1.2); I²C interface; 32-pin QFN; includes SHA-256 and ECC acceleration; no FIPS-140-2 certification for RNG or AES engines. | Supports modern TCG protocols (e.g., asymmetric key attestation, policy-based authorization); incompatible with legacy TPM 1.2-only BIOS/firmware stacks. | Select for new designs targeting TPM 2.0 ecosystem; avoid if backward compatibility with existing TPM 1.2 infrastructure is required. |
Compared with Infineon SLB9665TT2.0 and Nuvoton NPCT750AAX1G, the AT97SC3205T-G3M4B10B uniquely combines TPM 1.2 compliance, I²C interface, hardware physical presence support, and FIPS-140-2 certified crypto engines in a single 32-pin QFN-making it optimal for industrial and embedded systems constrained by legacy firmware and stringent regulatory validation requirements.
Availability
AT97SC3205T-G3M4B10B is available at Aetrix Electronics and suitable for server platform integrity, industrial PLC secure boot, and IoT edge device identity applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AT97SC3205T-G3M4B10B 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 now manufactures and supports the AT97SC3205T-G3M4B10B. Microchip is a global leader in microcontrollers, analog, FPGA, and security solutions with broad industrial and automotive qualification capabilities.
This device belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, single-chip hardware roots of trust for embedded systems requiring secure boot, remote attestation, and cryptographic key protection in resource-constrained environments.
FAQ
What is the primary interface type and speed supported by the AT97SC3205T-G3M4B10B?
The AT97SC3205T-G3M4B10B uses a two-wire I²C interface supporting Fast Mode at 400 kHz and Standard Mode at 100 kHz. Stable 400 kHz operation requires specific external pull-up resistors: 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK. The device does not support SPI or UART interfaces. This I²C implementation complies fully with TCG TPM 1.2 specification timing and protocol requirements.
Does the AT97SC3205T-G3M4B10B include FIPS-140-2 certification, and which components are covered?
Yes, the AT97SC3205T-G3M4B10B is FIPS-140-2 certified, covering its hardware Random Number Generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. Certification applies to the complete crypto subsystem as implemented in silicon-not just algorithm logic but also entropy sources, key scheduling, and side-channel resistance. The certification is documented in the official Atmel FIPS validation report referenced in the AT97SC3205T datasheet summary.
How is physical presence enforced on the AT97SC3205T-G3M4B10B, and what pin supports it?
Physical presence is enforced via the PP/GPIO pin on the AT97SC3205T-G3M4B10B, which serves as a hardware indicator for administrative actions like firmware updates or key deletion. When asserted high, it signals valid physical presence to the TPM firmware. The pin has an internal pull-down resistor and defaults to GPIO input mode. It is mandatory for TCG-compliant BIOS/UEFI implementations to route this signal from a front-panel button or service switch.
What package variant does the AT97SC3205T-G3M4B10B use, and are there pinout differences from the TSSOP version?
The AT97SC3205T-G3M4B10B uses the 32-pad QFN (32M3) package, not the 28-pin TSSOP. While both packages share identical functional pin definitions (e.g., SM_DAT, SM_CLK, VCC, GND), their physical layouts differ significantly: QFN has a 4.0 × 4.0 mm body with 0.40 mm pitch and an exposed GND center pad; TSSOP is 4.4 × 9.7 mm with 0.65 mm pitch. Pin counts and positions are not interchangeable-PCB layout must match the 32M3 footprint.
Can the AT97SC3205T-G3M4B10B store custom user data, and how much space is available?
Yes, the AT97SC3205T-G3M4B10B provides 2066 bytes of non-volatile (NV) user-defined storage space mapped to TPM_NV_INDEX addresses. This space is separate from internal key storage and is accessible via standard TCG TPM 1.2 commands (e.g., TPM_NV_Write, TPM_NV_Read). Data persists across power cycles and supports write-locking to prevent accidental or malicious overwrites-ideal for storing device certificates, calibration parameters, or audit logs.
AT97SC3205T-G3M4B10B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- 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-G3M4B10B FAQ
1.How can I place an order for AT97SC3205T-G3M4B10B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4B10B 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-G3M4B10B reliable?
The price and inventory of AT97SC3205T-G3M4B10B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4B10B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4B10B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4B10B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4B10B?
AT97SC3205T-G3M4B10B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4B10B 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-G3M4B10B?
For technical support, including AT97SC3205T-G3M4B10B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4B10B requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4B10B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4B10B 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-G3M4B10B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4B10B?
All AT97SC3205T-G3M4B10B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4B10B, 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-G3M4B10B part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4B10B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4B10B Tags
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SLM9670AQ20FW1311XTMA1
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