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Microchip Technology AT97SC3205T-G3M4C10B
- Part No.:
- AT97SC3205T-G3M4C10B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4C10B.pdf
- Description:
- PROD FF COM I2C TPM 4X4 32VQFN U
- Quantity:
- Payment:
- Shipping:
Inventory:980
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Product details
Overview
AT97SC3205T-G3M4C10B from Microchip Technology (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring an integrated 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 400 kHz and supports industrial temperature range (−40°C to +85°C).
For engineers reviewing the AT97SC3205T-G3M4C10B datasheet, AT97SC3205T-G3M4C10B pinout, AT97SC3205T-G3M4C10B application, or AT97SC3205T-G3M4C10B equivalent, this page delivers verified package mapping (32-pad QFN), confirmed I²C timing constraints, GPIO-Express-00 and PP/GPIO functional roles, low-power TWI_Wakeup# recovery behavior, and FIPS-140-2 module certification scope.
Technical Context
The AT97SC3205T-G3M4C10B integrates a dedicated AVR® 8-bit RISC CPU with on-chip EEPROM for RSA key storage and SRAM for runtime operations. Its crypto subsystem includes independent hardware engines for RSA, AES, SHA-1, HMAC, and a FIPS-140-2 validated PRNG - all accessible via TCG-defined command sets over I²C.
It implements full TPM 1.2 state management including physical presence assertion (PP/GPIO), deep-sleep entry/recovery (TWI_Wakeup# dual-pin activation), and secure NV indexing (TPM_NV_INDEX_GPIO_00 mapped to GPIO-Express-00). The device enforces tamper-resistant layout and secure firmware execution without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification fully implemented - enables standardized attestation, sealing, and platform integrity verification in PC, server, and embedded systems. |
| I²C Interface Speed | 400 kHz Fast Mode / 100 kHz Standard Mode - requires SM_DAT pull-up ≤800 Ω and SM_CLK pull-up ≤1.5 kΩ for stable high-speed operation. |
| Supply Voltage | 3.3 V ±10% - mandates local decoupling: 2200–4700 pF capacitor within 5 mm of each VCC–GND pair plus 0.1 μF at VCC node. |
| NV Storage Capacity | 2066 bytes user-defined data - allocated in persistent TPM NV space, accessible only via authenticated TCG commands. |
| Crypto Certification | FIPS-140-2 Level 2 certified module - validates RNG entropy quality, AES/SHA/RSA algorithm correctness, and HMAC integrity under NIST validation. |
| Operating Temperature | −40°C to +85°C industrial grade - ensures reliable TPM functionality across extended thermal environments in networking and industrial control equipment. |
| Package Type | 32-pad QFN (32M3), 4.0 × 4.0 × 0.90 mm, 0.40 mm pitch - exposes GND center pad tied internally; supports automated reflow and compact board layout. |
Pinout & Package
AT97SC3205T-G3M4C10B uses the 32-pad QFN (32M3) package: 4.0 × 4.0 mm body, 0.40 mm pitch, exposed GND center pad internally connected to system ground. Pin 1 marked by corner cut; pins numbered counterclockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply requiring strict decoupling: 2200–4700 pF cap per VCC–GND pair within 5 mm; 0.1 μF shared bypass within 10 mm. |
| GND | System ground reference | Multiple GND pins (including center pad) must be connected to low-impedance ground plane to ensure noise immunity and FIPS-140-2 compliance. |
| 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 required; 50% duty cycle improves stability at max speed. |
| GPIO-Express-00 | Dedicated NV-indexed GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up enabled; floats when unused; used for secure GPIO state persistence across resets. |
| PP/GPIO | Physical presence indicator | Active-high hardware signal indicating user-authorized TPM configuration changes; internal pull-down; floats when unused. |
| TWI_Wakeup# | Low-power recovery trigger | Two pins (TSSOP 7 & 22, QFN 7 & 22) must both be pulsed low to exit TPM_DeepSleep mode - prevents accidental wake-up. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | Offloads RSA key generation, signing, and decryption from host CPU - reduces software attack surface and accelerates attestation workflows. |
| FIPS-140-2 Certified RNG | Validated entropy source feeding all cryptographic operations - satisfies NIST SP 800-90A requirements for key derivation and protocol nonces. |
| Internal EEPROM for RSA Keys | Securely stores multiple private keys in tamper-resistant memory - prevents extraction even if host system is compromised. |
| GPIO-Express-00 NV Index Mapping | Enables persistent, TPM-protected GPIO state retention across power cycles - supports secure boot-state signaling and hardware-enforced policy enforcement. |
| Deep Sleep with Dual-Pin Wakeup | Reduces standby current while maintaining security state; requires coordinated low pulse on two dedicated pins - eliminates single-point failure in wake logic. |
Applications
| Server Platform Integrity | Industrial Control Secure Boot |
|---|---|
Use Scenario: Data center servers require hardware-rooted trust to verify firmware authenticity before OS load and attest platform health to remote management consoles. IC Role / Device Role / Timing Role: AT97SC3205T-G3M4C10B acts as the root-of-trust anchor, executing TPM 1.2 PCR extension and quote generation during POST and runtime. Use Value: Enables measured boot chain validation and remote attestation using FIPS-140-2 certified crypto - meets PCI-DSS and ISO/IEC 27001 infrastructure requirements. | Use Scenario: Programmable logic controllers (PLCs) in critical infrastructure must prevent unauthorized firmware updates and detect physical tampering. IC Role / Device Role / Timing Role: AT97SC3205T-G3M4C10B serves as secure boot controller and tamper event logger, interfacing with host MCU via I²C during power-on initialization. Use Value: Provides cryptographically signed boot image verification and stores tamper timestamps in protected NV memory - satisfies IEC 62443-3-3 SL2 security level. |
| Medical Device Authentication | Network Appliance Key Vault |
Use Scenario: Diagnostic imaging systems require FDA-compliant device identity binding and secure credential storage for DICOM TLS authentication. IC Role / Device Role / Timing Role: AT97SC3205T-G3M4C10B functions as a hardware-backed identity provider, generating and protecting ECDSA keys used in X.509 certificate enrollment. Use Value: Delivers FIPS-140-2 Level 2 validated key lifecycle management - satisfies 21 CFR Part 11 electronic signature and audit trail requirements. | Use Scenario: Enterprise firewalls and SD-WAN gateways store TLS private keys and perform hardware-accelerated SSL/TLS handshake offload. IC Role / Device Role / Timing Role: AT97SC3205T-G3M4C10B operates as isolated key vault, receiving encrypted key material from host and performing RSA decryption only upon authenticated command. Use Value: Prevents key exfiltration via memory dump or side-channel attacks - achieves Common Criteria EAL4+ assurance for cryptographic key protection. |
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, 32-pin QFN, but uses SPI interface instead of I²C; lacks GPIO-Express-00 NV index mapping. | Requires SPI-capable host controller; no native support for persistent GPIO state storage - limits use in tamper-detection scenarios needing NV-backed signals. | Select when host design already implements SPI-based TPM communication and GPIO persistence is not required. |
| NXP PTFT100A | TPM 2.0 compliant, 32-pin QFN, I²C interface, but no FIPS-140-2 certification; uses ARM SecurCore SC300 instead of AVR core. | Supports newer TCG algorithms (SHA-256, ECC) but lacks FIPS-140-2 validation - unsuitable for regulated environments requiring NIST-validated crypto modules. | Select when migrating to TPM 2.0 features and FIPS certification is not mandated by compliance framework. |
Compared with Infineon SLB9665TT2.0 and NXP PTFT100A, AT97SC3205T-G3M4C10B uniquely combines I²C interface, FIPS-140-2 Level 2 certification, and GPIO-Express-00 NV indexing - making it the only option among the three that satisfies both legacy TPM 1.2 deployment requirements and secure hardware GPIO state persistence.
Availability
AT97SC3205T-G3M4C10B is available at Aetrix Electronics and suitable for server platform integrity, industrial control secure boot, and medical device authentication requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AT97SC3205T-G3M4C10B 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-G3M4C10B belongs to Atmel's Trusted Platform Module family, designed specifically to deliver TCG-compliant hardware root-of-trust for embedded systems where firmware integrity, remote attestation, and secure key storage are mandatory.
FAQ
What is the interface type and maximum clock speed supported by AT97SC3205T-G3M4C10B?
AT97SC3205T-G3M4C10B uses an I²C interface supporting both Standard Mode (100 kHz) and Fast Mode (400 kHz). For reliable 400 kHz operation, the datasheet specifies SM_DAT pull-up resistance ≤800 Ω and SM_CLK pull-up ≤1.5 kΩ, with emphasis on maintaining near-50% duty cycle on SM_CLK to minimize communication errors.
Does AT97SC3205T-G3M4C10B include FIPS-140-2 certification, and what components does it cover?
Yes, AT97SC3205T-G3M4C10B is a FIPS-140-2 Level 2 certified module. The certification explicitly covers the hardware random number generator (RNG), HMAC, AES, SHA-1, and RSA cryptographic engines - validating their implementation against NIST SP 800-22 and SP 800-90A requirements.
What is the purpose of the GPIO-Express-00 pin on AT97SC3205T-G3M4C10B, and how is it used?
GPIO-Express-00 on AT97SC3205T-G3M4C10B is mapped to TPM_NV_INDEX_GPIO_00 and provides persistent, TPM-protected GPIO state storage. It features an internal pull-up resistor and floats when unused. This pin enables secure retention of hardware signal states (e.g., tamper switch status) across power cycles using the device's 2066-byte NV memory space.
How does AT97SC3205T-G3M4C10B enter and exit low-power sleep mode?
AT97SC3205T-G3M4C10B enters low-power sleep via the TPM_DeepSleep command. Recovery requires simultaneous active-low pulses on both TWI_Wakeup# pins (QFN pins 7 and 22). This dual-pin requirement prevents spurious wake events and ensures intentional, coordinated system-level control over sleep state transitions.
What package variant does AT97SC3205T-G3M4C10B use, and what are its mechanical dimensions?
AT97SC3205T-G3M4C10B uses the 32-pad QFN (32M3) package: 4.0 × 4.0 mm body size, 0.40 mm lead pitch, and 0.90 mm height. The exposed center pad is internally connected to GND and may be left floating or soldered to a PCB ground plane for thermal and electrical performance.
AT97SC3205T-G3M4C10B 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:
- 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-G3M4C10B FAQ
1.How can I place an order for AT97SC3205T-G3M4C10B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4C10B 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-G3M4C10B reliable?
The price and inventory of AT97SC3205T-G3M4C10B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4C10B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4C10B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4C10B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4C10B?
AT97SC3205T-G3M4C10B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4C10B 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-G3M4C10B?
For technical support, including AT97SC3205T-G3M4C10B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4C10B requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4C10B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4C10B 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-G3M4C10B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4C10B?
All AT97SC3205T-G3M4C10B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4C10B, 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-G3M4C10B part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4C10B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4C10B Tags
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