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Microchip Technology AT97SC3205T-U3A1620B
- Part No.:
- AT97SC3205T-U3A1620B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-U3A1620B.pdf
- Description:
- MEM FF IND I2C TPM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
AT97SC3205T-U3A1620B from Microchip (acquired 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 with I²C interface up to 400kHz and targets secure boot, platform authentication, and key management in embedded industrial systems.
For engineers reviewing the AT97SC3205T-U3A1620B datasheet, AT97SC3205T-U3A1620B pinout, AT97SC3205T-U3A1620B application, or AT97SC3205T-U3A1620B equivalent, key selection criteria include TPM 1.2 compliance, I²C timing constraints (SM_DAT pull-up ≤800Ω, SM_CLK pull-up ≤1.5kΩ), GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, and dual-package support (28-pin TSSOP / 32-pad QFN).
Technical Context
The AT97SC3205T-U3A1620B implements the full TCG TPM 1.2 specification stack in silicon, including dynamic internal memory management for RSA keys and hardware-accelerated cryptographic primitives. Its AVR CPU executes firmware that enforces physical security circuitry, tamper detection via XTAMPER input, and low-power deep-sleep recovery via TWI_Wakeup#.
It supports two I²C modes: 100kHz standard mode and 400kHz fast mode with strict duty-cycle requirements (near 50% optimal). The device uses internal EEPROM for persistent RSA key storage and provides 2066 bytes of user-defined NV space accessible via TPM_NV_Write/Read commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables interoperable trusted computing across OS and firmware layers. |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC, AES, SHA-1, RSA - meets federal cryptographic validation requirements for secure key generation and attestation. |
| I²C Interface | 400kHz Fast Mode / 100kHz Standard Mode - requires SM_DAT pull-up ≤800Ω and SM_CLK pull-up ≤1.5kΩ for stable high-speed operation. |
| Supply Voltage | 3.3V ±10% - mandates tight decoupling: 2200–4700pF caps <5mm from each VCC pin and 0.1μF cap <10mm at VCC node junction. |
| NV Storage | 2066 bytes user-defined space - allocated via TPM_NV_DefineSpace command; persists across power cycles and supports write-locking. |
| Operating Temp | Industrial range: −40°C to +85°C - validated for deployment in ruggedized embedded control and network infrastructure equipment. |
| Package Options | 28-pin Thin TSSOP (4.4×9.7mm, 0.65mm pitch) or 32-pad QFN (4.0×4.0mm, 0.40mm pitch) - both RoHS-compliant and lead-free. |
Pinout & Package
AT97SC3205T-U3A1620B is offered in two qualified packages: 28-pin Thin TSSOP (4.40mm × 9.70mm body, 0.65mm pitch) and 32-pad QFN (4.00mm × 4.00mm body, 0.40mm pitch). Both packages are RoHS-compliant and support industrial temperature range operation. The QFN substrate center pad is internally tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V supply requiring dedicated decoupling per pin - failure to meet placement and capacitor spec risks intermittent operation or crypto failure. |
| LRESET# | Active-Low Reset | Resets internal TPM state; minimum pulse width 2μs; must remain asserted until VCC stabilizes on power-up. |
| SM_DAT / SM_CLK | I²C Data/Clock | Bi-directional I²C bus interface - SM_DAT pull-up ≤800Ω and SM_CLK pull-up ≤1.5kΩ required for reliable 400kHz operation. |
| GPIO-Express-00 | Pre-mapped NV GPIO | Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up; floats high when unused - used for platform-specific status signaling. |
| PP/GPIO | Physical Presence Indicator | Hardware-level physical presence assertion (active-high); internal pull-down; floats low when unused - required for TPM admin lockout enforcement. |
| TWI_Wakeup# | Deep Sleep Recovery | Two-pin active-low wake signal - both pins must be pulsed low to exit TPM_DeepSleep state; pin 22 must be tied to GND/VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 turnkey solution | Integrates CPU, crypto engines, RNG, EEPROM, and I²C interface - eliminates external co-processors and reduces BOM count by ≥3 components. |
| FIPS-140-2 certified crypto suite | Certified RNG, HMAC, AES, SHA-1, and RSA engines - satisfies NIST SP 800-140B requirements for government and regulated industry deployments. |
| Hardware Physical Presence (PP) support | Dedicated PP/GPIO pin with internal pull-down - enables hardware-enforced admin lockout and prevents unauthorized TPM configuration changes. |
| XTAMPER input capability | TestBI/GPIO/XTAMPER pin supports tamper detection - triggers secure erase on voltage or timing violation; requires external tamper sensor circuitry. |
| Dynamic RSA key cache management | Automatic key loading/unloading via TPM_FlushSpecific/TPM_LoadKey2 - no host-side memory management logic required. |
Applications
| Secure Boot Authentication | Platform Integrity Attestation |
|---|---|
Use Scenario: Verifying firmware signature and hash chain before executing bootloader on industrial PLC controllers. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust authenticating SHA-1 hashes of boot stages using internally stored RSA keys. Use Value: Prevents execution of tampered firmware by enforcing cryptographic verification prior to CPU initialization - blocks persistent malware injection. | Use Scenario: Reporting system health metrics (e.g., BIOS version, driver load state) to remote management servers in telecom base stations. IC Role / Device Role / Timing Role: Generating signed quotes via TPM_Quote command using FIPS-certified RNG and SHA-1 engine. Use Value: Enables verifiable remote attestation without exposing private keys - critical for zero-trust network access policies. |
| Hardware-Based Key Storage | Secure Firmware Update |
Use Scenario: Storing TLS private keys for encrypted communication in network-attached storage (NAS) devices. IC Role / Device Role / Timing Role: Persistent NV storage of 2048-bit RSA keys in internal EEPROM - inaccessible to host OS or debug interfaces. Use Value: Eliminates software-based key extraction attacks - keys never leave TPM boundary during signing or decryption operations. | Use Scenario: Validating digital signatures on firmware update packages before flashing in medical imaging equipment. IC Role / Device Role / Timing Role: Performing SHA-1 hash and RSA signature verification using hardware crypto engines - offloads CPU and ensures deterministic timing. Use Value: Guarantees update authenticity and integrity even under hostile conditions - prevents rollback or malicious payload injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM security applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST33HTPH2Z2AI0 | TPM 2.0 compliant; supports SHA-256 and ECC; 3.3V I²C; 32-pin QFN only | Required for Windows 11 and modern UEFI Secure Boot; lacks GPIO-Express-00 mapping | Select for new designs requiring TPM 2.0 compliance and SHA-256 attestation - not drop-in compatible due to protocol and pinout differences. |
| SLB9670TT20I | TPM 2.0 compliant; integrated SPI/I²C; FIPS 140-2 Level 3 certified; 32-pin QFN | Supports SPI interface and enhanced physical security; higher certification level but larger footprint | Choose when FIPS 140-2 Level 3 validation or SPI interface is mandatory - requires PCB redesign and firmware adaptation. |
Compared with ST33HTPH2Z2AI0 and SLB9670TT20I, the AT97SC3205T-U3A1620B offers TPM 1.2 compatibility with GPIO-Express-00 and PP/GPIO pins optimized for legacy industrial platforms, while the alternatives provide TPM 2.0 features at the cost of firmware migration and layout changes.
Availability
AT97SC3205T-U3A1620B is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity attestation, and hardware-based key storage requiring stable component supply across industrial lifecycle durations.
Supply support for AT97SC3205T-U3A1620B 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 its security IC portfolio. The company specializes in microcontrollers, analog, and secure authentication solutions for industrial, automotive, and communications markets.
The AT97SC3205T-U3A1620B belongs to Atmel's legacy TPM product line designed specifically for embedded systems requiring TCG-compliant hardware root-of-trust in resource-constrained environments.
FAQ
What is the primary compliance standard met by the AT97SC3205T-U3A1620B?
The AT97SC3205T-U3A1620B is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification. It implements all mandatory commands and data structures defined in Parts 1–3 of the TCG TPM Main Specification. This compliance enables interoperability with BIOS, OS drivers (e.g., Microsoft TPM Base Services), and enterprise management tools supporting TPM 1.2. The AT97SC3205T-U3A1620B does not support TPM 2.0 features such as SHA-256 or ECC algorithms.
Does the AT97SC3205T-U3A1620B support both TSSOP and QFN packages, and how do they differ electrically?
Yes, the AT97SC3205T-U3A1620B is qualified in both 28-pin Thin TSSOP and 32-pad QFN packages. Electrically, both packages share identical pin functions, timing specifications, and I²C interface behavior - including 3.3V operation, 400kHz Fast Mode support, and identical reset and wakeup timing. The QFN package adds a GND-connected thermal pad and uses finer 0.40mm pitch versus 0.65mm in TSSOP, but no electrical performance difference exists between them.
How is the GPIO-Express-00 pin used in the AT97SC3205T-U3A1620B, and what is its default configuration?
The GPIO-Express-00 pin on the AT97SC3205T-U3A1620B is hardwired to TPM_NV_INDEX_GPIO_00 and defaults to GPIO input mode with an internal pull-up resistor. It serves as a platform-specific status indicator - for example, reporting hardware revision or board presence to the host system via NV read/write operations. When unused, it should be left floating due to the internal pull-up; tying it externally may cause contention or unintended state changes.
What are the decoupling requirements for VCC on the AT97SC3205T-U3A1620B, and why are they critical?
The AT97SC3205T-U3A1620B requires a 2200–4700pF ceramic bypass capacitor placed within 5mm of each VCC pin and adjacent GND pin, plus a 0.1μF capacitor at the VCC node junction within 10mm. These values are critical because insufficient decoupling causes voltage droop during crypto operations, leading to RNG failures, I²C bus lockups, or corrupted key storage. All capacitors must use X5R or X7R dielectrics to maintain stability across temperature and bias.
Can the AT97SC3205T-U3A1620B enter low-power sleep mode, and how is it awakened?
Yes, the AT97SC3205T-U3A1620B automatically enters low-power sleep when idle. To awaken from deep sleep, the host must pulse both TWI_Wakeup# pins (TSSOP pin 7 and pin 22; QFN pin 7 and pin 22) active-low simultaneously. Pin 22 must be tied to GND or VCC (directly or via 4.7kΩ), while pin 7 can float or tie to GND. Failure to assert both signals prevents recovery - this dual-pin requirement enhances security against spurious wake events.
AT97SC3205T-U3A1620B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-U3A1620B FAQ
1.How can I place an order for AT97SC3205T-U3A1620B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A1620B 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-U3A1620B reliable?
The price and inventory of AT97SC3205T-U3A1620B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A1620B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-U3A1620B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A1620B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-U3A1620B?
AT97SC3205T-U3A1620B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-U3A1620B 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-U3A1620B?
For technical support, including AT97SC3205T-U3A1620B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A1620B requirements.
6.How does Aetrix verify that AT97SC3205T-U3A1620B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-U3A1620B 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-U3A1620B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-U3A1620B?
All AT97SC3205T-U3A1620B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A1620B, 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-U3A1620B part is unused and in its original packaging.
Return procedure for AT97SC3205T-U3A1620B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-U3A1620B Tags
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