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Microchip Technology AT97SC3205T-U3A14-10
- Part No.:
- AT97SC3205T-U3A14-10
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-U3A14-10.pdf
- Description:
- IC CRYPTO TPM TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,385
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Product details
Overview
AT97SC3205T-U3A14-10 from Microchip Technology (formerly 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 (400 kHz Fast Mode) and supports industrial temperature range (−40°C to +85°C) in 32-pad QFN package.
For engineers reviewing the AT97SC3205T-U3A14-10 datasheet, AT97SC3205T-U3A14-10 pinout, AT97SC3205T-U3A14-10 application, or AT97SC3205T-U3A14-10 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in secure boot and firmware attestation, and confirmed alternative TPM modules for embedded system design and supply continuity planning.
Technical Context
The AT97SC3205T-U3A14-10 implements the full TCG TPM 1.2 stack in hardware, including dedicated cryptographic accelerators for RSA key generation, HMAC-SHA-1 hashing, and AES encryption. Its internal EEPROM stores RSA keys and 2066 bytes of user-defined NV data, managed via TCG-standard commands like TPM_FlushSpecific and TPM_LoadKey2.
It uses a dual-voltage I²C interface (SM_DAT/SM_CLK) supporting 100 kHz Standard Mode and 400 kHz Fast Mode with precise pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK), and includes physical security circuitry, tamper detection via XTAMPER input, and low-power deep-sleep recovery via TWI_Wakeup# pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification fully implemented - enables standardized secure boot, remote attestation, and sealed storage in Windows/Linux enterprise environments. |
| Crypto Engine | Hardware-accelerated RSA, SHA-1, HMAC, AES, and FIPS-140-2 certified RNG - offloads CPU, ensures deterministic timing, and meets cryptographic validation requirements. |
| I²C Interface | 400 kHz Fast Mode / 100 kHz Standard Mode - supports high-throughput command/response cycles; requires specific pull-up values (800 Ω/1.5 kΩ) for signal integrity at max speed. |
| Supply Voltage | 3.3 V ±10% - mandates tight decoupling: 2200–4700 pF caps <5 mm from each VCC–GND pair, plus 0.1 µF cap <10 mm at VCC node junction. |
| Operating Temp | −40°C to +85°C - qualified for industrial embedded applications including network appliances, industrial controllers, and edge gateways. |
| NV Storage | 2066 bytes user-defined data space - persistent across power cycles; allocated via TPM_NV_DefineSpace and accessed via TPM_NV_Read/Write commands. |
Pinout & Package
AT97SC3205T-U3A14-10 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 is validated per Atmel-8883AS datasheet summary, Table 1-2 and Figure 1-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3 V main supply; requires localized decoupling capacitors (2200–4700 pF) within 5 mm of each VCC–GND pair. |
| GND | System Ground Reference | Reference for all digital and analog circuits; substrate center pad is internally connected to GND and may be left floating or tied externally. |
| SM_DAT | I²C Bidirectional Data Line | Open-drain I²C data line; requires 800 Ω pull-up for reliable 400 kHz operation; supports TCG TPM command/response protocol. |
| SM_CLK | I²C Clock Input | Input-only clock line; requires 1.5 kΩ pull-up and near-50% duty cycle for stable high-speed communication. |
| PP/GPIO | Physical Presence Indicator / GPIO | Active-high hardware physical presence signal; internal pull-down; used to authorize sensitive TPM operations like dictionary attack lockout reset. |
| TWI_Wakeup# | Low-Power Sleep Recovery | Two-pin active-low wake mechanism (pins 7 & 22); both must be pulsed low to exit deep-sleep state initiated by TPM_DeepSleep command. |
Key Features
| Feature | Design Value |
|---|---|
| FIPS-140-2 Certification | Certified module covering RNG, HMAC, AES, SHA, and RSA engines - satisfies U.S. federal and global regulatory requirements for cryptographic modules. |
| Integrated AVR® Core | On-chip 8-bit RISC processor executes TPM firmware and manages internal memory management without host CPU intervention. |
| Secure Key Storage | Internal EEPROM stores RSA keys and protects them from extraction - prevents cloning and ensures key binding to platform identity. |
| XTAMPER Input | Dedicated tamper-detection pin (shared with TestBI/GPIO) - triggers secure erase or lockdown when physical intrusion is detected. |
| GPIO-Express-00 | Pre-mapped NV index (TPM_NV_INDEX_GPIO_00) with internal pull-up - enables persistent GPIO state retention across reboots for platform configuration tracking. |
Applications
| Secure Boot Validation | Firmware Attestation |
|---|---|
Use Scenario: Verifying integrity of bootloader and OS kernel before execution in industrial gateways and medical devices. IC Role / Device Role / Timing Role: TPM acts as root-of-trust during Power-On Self-Test (POST), extending PCR registers with hash measurements of firmware images. Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to hardware identity using RSA-signed PCRs. | Use Scenario: Remote verification of device firmware version and patch level by cloud management servers. IC Role / Device Role / Timing Role: TPM generates signed quotes containing current PCR values and nonce, enabling authenticated, replay-resistant attestation reports. Use Value: Enables zero-trust infrastructure by proving runtime integrity without exposing sensitive keys or internal state to remote verifier. |
| Sealed Storage Encryption | Hardware Physical Presence Control |
Use Scenario: Storing disk encryption keys (e.g., BitLocker, LUKS) that unlock only when platform configuration matches pre-recorded PCR values. IC Role / Device Role / Timing Role: TPM performs asymmetric key wrapping/unwrapping and binds decryption keys to measured boot state via TPM_Seal/Unseal commands. Use Value: Ensures encrypted data remains inaccessible if firmware or OS is tampered with - no software-only bypass possible. | Use Scenario: Enabling privileged TPM operations (e.g., clearing owner authorization, disabling dictionary attack protection) only after physical button press. IC Role / Device Role / Timing Role: PP/GPIO pin serves as hardware-enforced physical presence indicator; TPM firmware validates its asserted state before executing sensitive commands. Use Value: Mitigates remote privilege escalation by requiring local human intervention for irreversible security policy changes. |
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, 3.3 V, but uses SPI interface instead of I²C; lacks AVR core - relies on external host for command parsing. | Requires SPI-capable host controller and driver adaptation; not drop-in for I²C-based designs. | Select when SPI interface is preferred and host has sufficient resources to handle TPM command dispatching. |
| Nuvoton NPCT750AA0GX | TPM 1.2 compliant, 32-pin QFN, 3.3 V, I²C interface at 400 kHz; integrates ARM Cortex-M0+ instead of AVR; includes hardware SHA-256 (not SHA-1 only). | Supports stronger hashing algorithms and modern firmware update workflows; requires ARM toolchain integration. | Select when SHA-256 support and ARM ecosystem alignment are required for future-proofing. |
Compared with AT97SC3205T-U3A14-10, SLB9665TT2.0 shifts crypto command handling to host via SPI, increasing software overhead but simplifying module firmware, while NPCT750AA0GX upgrades hashing to SHA-256 and replaces AVR with Cortex-M0+, offering broader algorithm support at the cost of architectural divergence.
Availability
AT97SC3205T-U3A14-10 is available at Aetrix Electronics and suitable for industrial control systems, network security appliances, medical diagnostics equipment, and edge computing platforms requiring stable component supply and long-term lifecycle assurance.
Supply support for AT97SC3205T-U3A14-10 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 manufacturing continuity for legacy Atmel security ICs.
The AT97SC3205T-U3A14-10 belongs to Atmel's TPM family designed specifically for embedded systems needing hardware-rooted trust, secure key management, and TCG-standardized attestation capabilities in space-constrained industrial form factors.
FAQ
What is the primary interface type and speed supported by the AT97SC3205T-U3A14-10?
The AT97SC3205T-U3A14-10 uses an I²C interface supporting both Standard Mode (100 kHz) and Fast Mode (400 kHz). For reliable 400 kHz operation, the datasheet specifies 800 Ω pull-up on SM_DAT and 1.5 kΩ on SM_CLK, with emphasis on maintaining near-50% duty cycle on SM_CLK. This interface enables direct connection to standard microcontroller I²C peripherals without protocol translation.
Does the AT97SC3205T-U3A14-10 include certified cryptographic modules?
Yes, the AT97SC3205T-U3A14-10 is FIPS-140-2 Level 2 certified, covering its hardware random number generator (RNG), HMAC, AES, SHA-1, and RSA engines. This certification validates the implementation against stringent U.S. government security requirements and is documented in the official FIPS certificate issued to Atmel's TPM module design.
How does the AT97SC3205T-U3A14-10 manage RSA key storage and protection?
The AT97SC3205T-U3A14-10 stores RSA keys in internal EEPROM with hardware-enforced access controls. Keys are generated on-chip by the dedicated crypto engine and never exposed outside the module. Protection includes physical security circuitry, tamper detection via XTAMPER, and binding to platform configuration through PCR extension - ensuring keys remain bound to trusted boot state.
What is the purpose of the PP/GPIO pin on the AT97SC3205T-U3A14-10?
The PP/GPIO pin on the AT97SC3205T-U3A14-10 serves dual roles: as a hardware Physical Presence indicator (active-high) and as a general-purpose I/O. In TPM security workflows, it must be asserted to authorize privileged operations like owner clear or dictionary attack lockout reset - enforcing local human intervention before irreversible actions.
Can the AT97SC3205T-U3A14-10 operate in low-power modes, and how is wake-up handled?
Yes, the AT97SC3205T-U3A14-10 enters low-power sleep automatically when idle and supports deep-sleep mode via the TPM_DeepSleep command. Wake-up requires pulsing both TWI_Wakeup# pins (pins 7 and 22) low simultaneously - a hardware-gated mechanism preventing accidental or remote wake events and preserving security state integrity.
AT97SC3205T-U3A14-10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
AT97SC3205T-U3A14-10 FAQ
1.How can I place an order for AT97SC3205T-U3A14-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A14-10 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-U3A14-10 reliable?
The price and inventory of AT97SC3205T-U3A14-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A14-10 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-U3A14-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A14-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-U3A14-10?
AT97SC3205T-U3A14-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-U3A14-10 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-U3A14-10?
For technical support, including AT97SC3205T-U3A14-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A14-10 requirements.
6.How does Aetrix verify that AT97SC3205T-U3A14-10 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-U3A14-10 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-U3A14-10 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-U3A14-10?
All AT97SC3205T-U3A14-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A14-10, 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-U3A14-10 part is unused and in its original packaging.
Return procedure for AT97SC3205T-U3A14-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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