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Microchip Technology AT97SC3205T-G3M4C-00
- Part No.:
- AT97SC3205T-G3M4C-00
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4C-00.pdf
- Description:
- FF COM I2C TPM 4X4 32VQFN CEK
- Quantity:
- Payment:
- Shipping:
Inventory:413
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Product details
Overview
AT97SC3205T-G3M4C-00 from Microchip Technology (formerly Atmel) is a Trusted Platform Module (TPM) IC compliant with TCG TPM 1.2 specification, 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 (400 kHz Fast Mode) and targets secure boot, platform authentication, and key management in embedded computing systems.
For engineers reviewing the AT97SC3205T-G3M4C-00 datasheet, AT97SC3205T-G3M4C-00 pinout, AT97SC3205T-G3M4C-00 application, or AT97SC3205T-G3M4C-00 equivalent, this page delivers verified technical context, package-specific pin functions, real-world use scenarios, and validated alternative options for secure system design.
Technical Context
The AT97SC3205T-G3M4C-00 implements full TCG TPM 1.2 functionality in a single chip, using an on-die AVR 8-bit RISC CPU to execute firmware and manage cryptographic operations. Its hardware crypto engine accelerates RSA key generation and signing, SHA-1 hashing, HMAC authentication, and AES encryption without host CPU involvement.
It supports I²C communication at up to 400 kHz with configurable pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK), includes dedicated physical presence (PP/GPIO) and tamper detection (XTAMPER via TestBI/GPIO/XTAMPER), and enters low-power sleep mode automatically when idle-recoverable via TWI_Wakeup# pulse sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables standardized secure boot, attestation, and sealed storage across OS and firmware layers. |
| I²C Interface Speed | 400 kHz Fast Mode / 100 kHz Standard Mode - determines maximum command throughput and latency for host-TPM transactions. |
| Supply Voltage | 3.3 V ±10% - requires tight regulation and local decoupling (2200–4700 pF near each VCC pin, 0.1 µF at VCC node) for stable cryptographic operation. |
| NV Storage Capacity | 2066 bytes user-defined data - supports persistent storage of keys, certificates, and policy objects without external EEPROM. |
| FIPS Certification | FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, and RSA engines - satisfies U.S. federal and enterprise security validation requirements. |
| Operating Temperature | −40°C to +85°C industrial range - ensures reliable operation in rugged embedded environments including industrial gateways and edge servers. |
| Package Options | 28-pin Thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) or 32-pad QFN (4.0 × 4.0 mm, 0.40 mm pitch) - enables layout flexibility for space-constrained PCBs. |
Pinout & Package
AT97SC3205T-G3M4C-00 is offered in two RoHS-compliant, lead-free packages: 28-pin Thin TSSOP (28X1) and 32-pad Very Thin QFN (32M3). The G3M4C-00 suffix denotes the 32-pad QFN variant with industrial temperature range (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply requiring localized decoupling (2200–4700 pF per pin, 0.1 µF shared node) to prevent noise-induced crypto failures. |
| GND | Ground reference | System ground connection; QFN center pad is internally tied to GND and may be left floating or soldered to PCB ground plane. |
| SM_DAT / SM_CLK | I²C bidirectional data / clock | Standard I²C interface pins; require external pull-ups (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK) for reliable 400 kHz operation. |
| LRESET# | Active-low reset input | Hardware reset signal; minimum 2 µs pulse width required; must remain asserted until VCC stabilizes on power-up. |
| PP/GPIO | Physical presence indicator | Hardware-level confirmation of user authorization for sensitive TPM operations (e.g., clearing owner state); active-high, internal pull-down. |
| TestBI/GPIO/XTAMPER | Multipurpose terminal | Configurable as GPIO, external tamper sensor input (XTAMPER), or test pin; unused state requires tie to GND via 4.7 kΩ resistor. |
| TWI_Wakeup# | Low-power recovery trigger | Two-pin wake-up mechanism (pins 7 & 22 in TSSOP; pins 7 & 22 in QFN) - both must be pulsed low to exit deep sleep mode. |
| PIRQ# | Interrupt request output | Open-drain interrupt signal to host processor indicating TPM event completion or error condition; requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Eliminates external microcontroller, crypto accelerator, and non-volatile memory - reduces BOM count and board area by >40% vs discrete implementations. |
| FIPS-140-2 Level 2 certification | Validates RNG entropy quality, algorithm correctness, and physical security mechanisms - satisfies compliance mandates for government and financial systems. |
| Internal EEPROM for RSA keys | Securely stores multiple asymmetric key pairs within tamper-resistant silicon - prevents key extraction even if device is physically compromised. |
| Hardware Physical Presence (PP) | Enforces human-in-the-loop authorization for critical operations (e.g., TPM ownership clear), preventing remote malicious reconfiguration. |
| XTAMPER support | Enables connection to external tamper-detection switches or sensors - triggers automatic key zeroization upon enclosure breach or voltage anomaly. |
Applications
| Server Platform Authentication | Industrial Edge Gateway Security |
|---|---|
Use Scenario: Verifying hardware integrity during BIOS/firmware boot sequence in rack-mounted servers. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust IC performing measured boot, PCR extension, and attestation signing. Use Value: Enables remote verification that only authorized firmware executed at boot - blocks persistent malware and unauthorized configuration changes. | Use Scenario: Securing firmware updates and device identity in programmable logic controllers (PLCs) deployed in factory automation networks. IC Role / Device Role / Timing Role: Secure key storage and cryptographic acceleration for TLS handshake and signed OTA updates. Use Value: Prevents man-in-the-middle attacks and counterfeit firmware injection - maintains operational continuity under cyber-physical threat conditions. |
| Medical Imaging Device Integrity | Network Appliance Root-of-Trust |
Use Scenario: Ensuring unmodified diagnostic software execution in MRI or CT scanner control units subject to FDA cybersecurity guidance. IC Role / Device Role / Timing Role: Hardware-enforced secure boot and runtime attestation agent interfacing with host ARM processor over I²C. Use Value: Meets IEC 62304 and FDA premarket submission requirements for cryptographic assurance of software authenticity and integrity. | Use Scenario: Authenticating firmware images and establishing TLS sessions in enterprise firewalls and SD-WAN appliances. IC Role / Device Role / Timing Role: Dedicated TPM co-processor handling certificate enrollment, private key protection, and hardware-based signing for PKI infrastructure. Use Value: Offloads crypto-intensive tasks from main CPU while guaranteeing private key confidentiality - improves throughput and meets NIST SP 800-193 guidelines. |
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 SLB9670 | Same TPM 1.2 compliance, 32-pin QFN, 3.3 V, but uses SPI interface instead of I²C; lacks XTAMPER pin. | Requires SPI-capable host controller; no hardware tamper sensing capability - unsuitable where physical intrusion detection is mandated. | Select SLB9670 only if host platform has SPI bandwidth headroom and tamper response is handled externally. |
| Nuvoton NPCT750 | TPM 2.0 compliant, 32-pin QFN, 3.3 V, I²C interface, includes enhanced SHA-256 and ECC support; no FIPS-140-2 certification. | Supports modern cryptographic algorithms and policy controls unavailable in TPM 1.2; lacks formal FIPS validation required for U.S. federal deployments. | Choose NPCT750 for new designs needing forward-compatible TPM 2.0 features, provided FIPS-140-2 is not contractually required. |
Compared with SLB9670 and NPCT750, the AT97SC3205T-G3M4C-00 uniquely combines I²C interface, FIPS-140-2 Level 2 certification, and integrated XTAMPER support - making it optimal for industrial and medical systems requiring legacy TPM 1.2 compatibility, regulatory validation, and hardware tamper resilience.
Availability
AT97SC3205T-G3M4C-00 is available at Aetrix Electronics and suitable for server platform authentication, industrial edge gateway security, and medical imaging device integrity requiring stable component supply and long-term lifecycle assurance.
Supply support for AT97SC3205T-G3M4C-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.
The AT97SC3205T-G3M4C-00 belongs to Atmel's Trusted Platform Module family, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems requiring hardware-rooted trust and cryptographic offload.
FAQ
What is the primary interface protocol supported by the AT97SC3205T-G3M4C-00?
The AT97SC3205T-G3M4C-00 supports only the I²C interface, operating at 400 kHz Fast Mode or 100 kHz Standard Mode. It does not support SPI, UART, or LPC interfaces. Pull-up resistors of 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK are recommended for reliable high-speed communication. This I²C-only architecture simplifies host integration in resource-constrained microcontroller-based platforms.
Does the AT97SC3205T-G3M4C-00 include certified cryptographic modules?
Yes, the AT97SC3205T-G3M4C-00 integrates FIPS-140-2 Level 2 certified modules for RNG, HMAC, AES, SHA-1, and RSA. Certification covers both algorithm implementation and physical security mechanisms, including resistance to side-channel and fault injection attacks. This validation is documented in the official FIPS certificate and applies directly to the AT97SC3205T-G3M4C-00 silicon and firmware version shipped with the part.
How does the AT97SC3205T-G3M4C-00 handle low-power operation?
The AT97SC3205T-G3M4C-00 automatically enters low-power sleep mode when idle. Recovery requires pulsing both TWI_Wakeup# pins (TSSOP pins 7 & 22; QFN pins 7 & 22) low simultaneously. No software command or host intervention is needed to initiate sleep - power state transitions are fully hardware-managed, reducing host driver complexity and improving energy efficiency in always-on embedded devices.
What is the function of the PP/GPIO pin on the AT97SC3205T-G3M4C-00?
The PP/GPIO pin on the AT97SC3205T-G3M4C-00 serves as the Hardware Physical Presence indicator, active-high with internal pull-down. It signals user-authorized physical access for critical TPM operations such as owner clear or dictionary attack lockout reset. When asserted, it confirms human presence at the device - a mandatory requirement under TCG TPM 1.2 specification for privileged administrative actions.
Can the AT97SC3205T-G3M4C-00 store custom user data, and how much space is available?
Yes, the AT97SC3205T-G3M4C-00 provides 2066 bytes of non-volatile (NV) storage for user-defined data, allocated in the TPM's NV index space. This space is accessible via standard TCG commands (e.g., TPM_NV_DefineSpace, TPM_NV_Write) and persists across power cycles. It is commonly used to store platform-specific certificates, policy blobs, or encrypted configuration parameters outside the scope of standard TPM key hierarchies.
AT97SC3205T-G3M4C-00 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-G3M4C-00 FAQ
1.How can I place an order for AT97SC3205T-G3M4C-00 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4C-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-G3M4C-00 reliable?
The price and inventory of AT97SC3205T-G3M4C-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-G3M4C-00 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4C-00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4C-00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4C-00?
AT97SC3205T-G3M4C-00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4C-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-G3M4C-00?
For technical support, including AT97SC3205T-G3M4C-00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4C-00 requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4C-00 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4C-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-G3M4C-00 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4C-00?
All AT97SC3205T-G3M4C-00 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4C-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-G3M4C-00 part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4C-00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4C-00 Tags
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