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Microchip Technology AT97SC3205T-U3A1410B
- Part No.:
- AT97SC3205T-U3A1410B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-U3A1410B.pdf
- Description:
- MEM FF IND I2C TPM 28TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205T-U3A1410B 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 bytes of user NV storage. It operates at 3.3V with I²C interface up to 400 kHz and targets secure boot and platform authentication in embedded computing systems.
For engineers reviewing the AT97SC3205T-U3A1410B datasheet, AT97SC3205T-U3A1410B pinout, AT97SC3205T-U3A1410B application, or AT97SC3205T-U3A1410B equivalent, key selection considerations include I²C timing compliance, GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, physical presence (PP/GPIO) support, low-power TWI_Wakeup# recovery, and dual-package availability (28-pin TSSOP / 32-pad QFN).
Technical Context
The AT97SC3205T-U3A1410B 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 FIPS-140-2 validated hardware engines for HMAC, AES, SHA-1, and RSA-enabling full TCG TPM 1.2 command execution without host-side cryptographic offload.
Communication occurs exclusively via I²C (SM_DAT/SM_CLK), supporting both Standard Mode (100 kHz) and Fast Mode (400 kHz) with strict pull-up resistor guidance (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK). The device implements dynamic internal key cache management and supports deep-sleep mode with dual active-low TWI_Wakeup# pins for deterministic wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation per Trusted Computing Group standards. |
| I²C Interface Speed | Up to 400 kHz Fast Mode; requires precise pull-up values (800 Ω SM_DAT, 1.5 kΩ SM_CLK) for stable operation. |
| Crypto Certification | FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, and RSA engines - validated for production security use. |
| User NV Storage | 2066 bytes of non-volatile storage accessible via TPM_NV_Write/TPM_NV_Read commands. |
| Supply Voltage | 3.3 V ±10%; requires local decoupling: 2200–4700 pF capacitors within 5 mm of each VCC pin and 0.1 µF at VCC node. |
| Operating Temperature | Industrial range: −40°C to +85°C - suitable for extended-temperature embedded control and server platforms. |
| 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). |
Pinout & Package
AT97SC3205T-U3A1410B is available in two RoHS-compliant packages: 28-pin Thin TSSOP (28X1) and 32-pad Very Thin QFN (32M3). Both packages support industrial temperature range and share identical pin functionality, though pin numbering differs. The QFN substrate center pad is internally tied to GND and may be left floating or connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires localized high-frequency decoupling (2200–4700 pF) and bulk bypass (0.1 µF) per layout guidelines. |
| LRESET# | Active-low reset | Asynchronous reset signal; minimum pulse width 2 µs; must remain asserted until VCC stabilizes at power-up. |
| SM_DAT / SM_CLK | I²C bidirectional data/clock | Standard I²C interface; supports 100/400 kHz; pull-up values critical for timing margin at 400 kHz. |
| PP/GPIO | Hardware physical presence indicator | Active-high GPIO used to assert physical presence during TPM initialization; internal pull-down enables floating when unused. |
| GPIO-Express-00 | Dedicated NV-mapped GPIO | Maps directly to TPM_NV_INDEX_GPIO_00; internal pull-up allows safe floating when not configured as output. |
| TWI_Wakeup# (pins 7 & 22) | Low-power sleep recovery | Both pins must be pulsed low simultaneously to exit deep-sleep mode; enables deterministic wake-up without host polling. |
| PIRQ# | Interrupt request output | Active-low interrupt signal indicating pending TPM event; requires external pull-up and tie-to-GND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates AVR CPU, crypto engines, RNG, EEPROM, and I²C interface - eliminates external components and firmware integration effort. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies regulatory requirements for government and enterprise security deployments. |
| Dynamic key cache management | Automatically handles RSA key loading/unloading via TPM_FlushSpecific and TPM_LoadKey2 - no host software memory management required. |
| GPIO-Express-00 NV indexing | Direct mapping to TPM_NV_INDEX_GPIO_00 enables persistent GPIO state retention across reboots without custom NV space allocation. |
| Deep-sleep with dual-wakeup | Reduces idle power consumption; requires coordinated low pulse on both TWI_Wakeup# pins - prevents spurious wake events. |
Applications
| Secure Server Boot | Industrial HMI Authentication |
|---|---|
Use Scenario: Verifying firmware integrity before loading UEFI/BIOS during server power-on sequence. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust authenticating PCR values and signing boot measurements via RSA signature generation. Use Value: Prevents unauthorized firmware modification by binding boot process to hardware-secured keys stored in internal EEPROM. | Use Scenario: Authenticating operator identity and session permissions on factory-floor HMIs with restricted access levels. IC Role / Device Role / Timing Role: Secure credential storage and challenge-response authentication using HMAC-SHA1 over I²C. Use Value: Enables tamper-resistant role-based access control without exposing secrets to host MCU firmware. |
| Embedded Edge Gateway Security | Medical Device Data Integrity |
Use Scenario: Securing TLS key exchange and device attestation for IoT gateways connecting to cloud infrastructure. IC Role / Device Role / Timing Role: Hardware-accelerated RSA key generation and digital signing for X.509 certificate provisioning. Use Value: Offloads computationally intensive crypto from resource-constrained host processors while ensuring private key isolation. | Use Scenario: Ensuring audit log immutability and firmware version verification in FDA-cleared diagnostic equipment. IC Role / Device Role / Timing Role: Storing signed firmware hashes and timestamped event logs in FIPS-validated NV storage. Use Value: Meets 21 CFR Part 11 requirements for electronic records and signatures through cryptographically sealed data. |
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 | Supports TPM 2.0; uses SPI interface instead of I²C; larger 32-pin QFN only; higher max clock (66 MHz CPU). | Required for new designs targeting TPM 2.0 compliance; incompatible I²C/SPI protocol stack and command set. | Select if migrating to TPM 2.0 or requiring SPI interface; not drop-in compatible due to interface and firmware differences. |
| Nuvoton NPCT750AAAX | TPM 1.2 compliant; I²C interface; 32-pin QFN only; lacks GPIO-Express-00 and PP/GPIO pins; smaller NV space (1024 B). | Suitable for cost-sensitive designs where physical presence and dedicated GPIO indexing are not required. | Choose when footprint and basic TPM 1.2 functionality suffice and GPIO-Express-00 or PP/GPIO features are unnecessary. |
Compared with Infineon SLB9665TT2.0 and Nuvoton NPCT750AAAX, the AT97SC3205T-U3A1410B uniquely combines I²C interface, GPIO-Express-00 NV indexing, hardware physical presence support, and industrial-temperature 28-pin TSSOP option - making it optimal for legacy TPM 1.2 upgrades in space-constrained embedded systems.
Availability
AT97SC3205T-U3A1410B is available at Aetrix Electronics and suitable for secure server boot, industrial HMI authentication, and embedded edge gateway security requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for AT97SC3205T-U3A1410B 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 trusted computing portfolio. The company specializes in microcontrollers, analog, and security ICs for industrial, automotive, and communications markets.
The AT97SC3205T-U3A1410B belongs to Atmel's TPM security module product line, designed specifically to deliver certified, single-chip trusted platform functionality for embedded systems requiring hardware-rooted security and TCG compliance.
FAQ
What is the primary interface protocol supported by the AT97SC3205T-U3A1410B?
The AT97SC3205T-U3A1410B supports only the I²C interface (SM_DAT/SM_CLK), operating at Standard Mode (100 kHz) or Fast Mode (400 kHz). It does not support SPI, UART, or LPC interfaces. Pull-up resistor values are critical for reliable 400 kHz operation: 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK are validated values per the datasheet summary.
Does the AT97SC3205T-U3A1410B support TPM 2.0?
No, the AT97SC3205T-U3A1410B implements only the TCG TPM 1.2 specification. It is not compatible with TPM 2.0 commands, algorithms, or structures. For TPM 2.0 functionality, designers must select alternatives such as the Infineon SLB9665TT2.0, which requires full firmware and driver redesign due to architectural differences.
How is the GPIO-Express-00 pin used in the AT97SC3205T-U3A1410B?
The GPIO-Express-00 pin on the AT97SC3205T-U3A1410B maps directly to TPM_NV_INDEX_GPIO_00, enabling persistent storage and retrieval of GPIO state across power cycles. It features an internal pull-up resistor and defaults to input mode. This eliminates the need for custom NV index allocation and simplifies stateful peripheral control in secure boot sequences.
What package options are available for the AT97SC3205T-U3A1410B?
The AT97SC3205T-U3A1410B is offered in two RoHS-compliant packages: 28-pin Thin TSSOP (28X1, 4.4 × 9.7 mm body, 0.65 mm pitch) and 32-pad Very Thin QFN (32M3, 4.0 × 4.0 mm body, 0.40 mm pitch). Both support industrial temperature range (−40°C to +85°C) and share identical electrical functionality and pin roles.
Is the AT97SC3205T-U3A1410B FIPS-140-2 certified?
Yes, the AT97SC3205T-U3A1410B is FIPS-140-2 Level 2 certified, covering its hardware random number generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This certification applies to the complete module and validates its suitability for U.S. federal and regulated industry applications requiring cryptographic module validation.
AT97SC3205T-U3A1410B 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-U3A1410B FAQ
1.How can I place an order for AT97SC3205T-U3A1410B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A1410B 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-U3A1410B reliable?
The price and inventory of AT97SC3205T-U3A1410B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A1410B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-U3A1410B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A1410B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-U3A1410B?
AT97SC3205T-U3A1410B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-U3A1410B 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-U3A1410B?
For technical support, including AT97SC3205T-U3A1410B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A1410B requirements.
6.How does Aetrix verify that AT97SC3205T-U3A1410B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-U3A1410B 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-U3A1410B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-U3A1410B?
All AT97SC3205T-U3A1410B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A1410B, 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-U3A1410B part is unused and in its original packaging.
Return procedure for AT97SC3205T-U3A1410B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-U3A1410B Tags
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