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Microchip Technology AT97SC3205T-X3A16-10
- Part No.:
- AT97SC3205T-X3A16-10
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-X3A16-10.pdf
- Description:
- IC CRYPTO TPM TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,429
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Product details
Overview
AT97SC3205T-X3A16-10 from Microchip Technology (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring 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 (400kHz Fast Mode) and targets secure boot and platform authentication in industrial embedded systems.
For engineers reviewing the AT97SC3205T-X3A16-10 datasheet, AT97SC3205T-X3A16-10 pinout, AT97SC3205T-X3A16-10 application, or AT97SC3205T-X3A16-10 equivalent, key selection factors include TPM 1.2 compliance, I²C timing constraints (SM_DAT/SM_CLK pull-up guidance), GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, low-power deep-sleep recovery via TWI_Wakeup#, and dual-package availability (28-pin TSSOP / 32-pad QFN).
Technical Context
The AT97SC3205T-X3A16-10 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 certified hardware engines for RNG, HMAC, AES, SHA-1, and RSA-enabling full TCG 1.2 command execution without host CPU offload.
Communication occurs exclusively over I²C (SM_DAT/SM_CLK), supporting 100kHz Standard Mode and 400kHz Fast Mode with strict duty-cycle and pull-up resistor requirements (800Ω on SM_DAT, 1.5kΩ on SM_CLK). The device implements hardware physical presence (PP/GPIO) and tamper detection (XTAMPER via TestBI/GPIO/XTAMPER), with low-power sleep recovery triggered by dual active-low TWI_Wakeup# signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TPM Specification | TCG TPM 1.2 compliant - enables standardized platform integrity attestation and sealed storage per industry security frameworks. |
| I²C Interface Speed | 400kHz Fast Mode / 100kHz Standard Mode - requires precise SM_CLK duty cycle and specified pull-up resistors (1.5kΩ/800Ω) for stable communication. |
| Crypto Certification | FIPS-140-2 Level 2 certified - validates RNG, HMAC, AES, SHA, and RSA engines meet U.S. government cryptographic module standards. |
| NV Storage Capacity | 2066 bytes user-defined data - allocated in TPM NV space for persistent keys, policies, or custom credentials across power cycles. |
| Supply Voltage | 3.3V ±10% - mandates tight decoupling: 2200–4700pF caps <5mm from each VCC-GND pair plus 0.1μF cap <10mm at VCC node junction. |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments; thermal derating not required within this range. |
| Package Options | 28-pin Thin TSSOP (4.4×9.7mm, 0.65mm pitch) or 32-pad QFN (4.0×4.0×0.9mm, 0.40mm pitch) - both RoHS-compliant and lead-free. |
Pinout & Package
AT97SC3205T-X3A16-10 is available in two packages: 28-pin Thin TSSOP (4.40mm × 9.70mm body, 0.65mm pitch) and 32-pad QFN (4.00mm × 4.00mm × 0.90mm body, 0.40mm pitch). Both are RoHS-compliant, lead-free, and support industrial temperature range (-40°C to +85°C). The QFN substrate center pad is internally tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V main supply; requires localized high-frequency decoupling (2200–4700pF) and bulk bypass (0.1μF) per layout guidelines. |
| GND | System Ground Reference | Reference for all analog/digital circuits; QFN center pad must be connected to system GND for thermal and electrical stability. |
| SM_DAT / SM_CLK | I²C Data/Clock Interface | Bi-directional open-drain I²C bus lines; require external pull-ups (800Ω/1.5kΩ) and 50% SM_CLK duty cycle for reliable 400kHz operation. |
| LRESET# | Active-Low Reset Input | Asynchronous reset; minimum 2μs pulse width; must remain asserted until VCC stabilizes at power-up. |
| GPIO-Express-00 | Dedicated NV Index GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up enabled; leave floating if unused to avoid unintended state changes. |
| PP/GPIO | Physical Presence Indicator | Hardware-based physical presence signal (active-high); internal pull-down; used for TPM authorization of sensitive commands. |
| TWI_Wakeup# | Low-Power Sleep Recovery | Two-pin active-low wake mechanism; both pins must be pulsed low to exit TPM_DeepSleep mode. |
| TestBI/GPIO/XTAMPER | Multi-function Tamper Input | Configurable as external tamper sensor (XTAMPER) or GPIO; tie to GND via 4.7kΩ if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates AVR CPU, crypto engines, EEPROM, RNG, and I²C interface in one die-eliminates external components and reduces BOM count. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines-provides verifiable assurance for government and regulated-sector deployments. |
| Hardware Physical Presence (PP) | PP/GPIO pin enforces human-verified authorization before executing privileged TPM commands like Clear, OwnerSetDisable, or DictionaryAttackLockReset. |
| Deep-sleep power management | TPM_DeepSleep command reduces current draw significantly; recovery requires coordinated TWI_Wakeup# pulses-extends system battery life in portable/embedded use cases. |
| GPIO-Express-00 NV indexing | Direct mapping to TPM_NV_INDEX_GPIO_00 enables deterministic, non-volatile GPIO state retention across reboots without host software intervention. |
Applications
| Secure Boot Authentication | Platform Integrity Attestation |
|---|---|
Use Scenario: Verifying firmware signature and measurement chain during system startup in industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; stores PCR values and signs boot logs using embedded RSA keys. Use Value: Prevents unauthorized firmware execution by cryptographically binding boot sequence to hardware identity-enables remote verification of unmodified boot path. | Use Scenario: Reporting system configuration state to cloud management services in network infrastructure equipment. IC Role / Device Role / Timing Role: TPM generates signed quotes of Platform Configuration Registers (PCRs) upon request via I²C. Use Value: Enables third-party validation that hardware/firmware state matches expected policy-critical for zero-trust network access control. |
| Hardware-Based Key Vault | Physical Presence-Controlled Operations |
Use Scenario: Storing and protecting TLS private keys for encrypted communications in edge IoT sensors. IC Role / Device Role / Timing Role: TPM serves as isolated key storage; performs RSA signing/decryption internally without exposing keys to host memory. Use Value: Mitigates key extraction attacks-even if host MCU is compromised, private keys remain inaccessible in protected TPM EEPROM. | Use Scenario: Enabling secure factory provisioning of cryptographic credentials in manufacturing test fixtures. IC Role / Device Role / Timing Role: PP/GPIO pin asserts physical presence to authorize TPM_Clear or TPM_OwnerSetDisable commands. Use Value: Ensures sensitive administrative actions require local hardware confirmation-prevents remote privilege escalation via software-only interfaces. |
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 | Supports TPM 2.0 and LPC interface in addition to I²C; higher max clock (1MHz I²C); no AVR core-uses proprietary secure processor. | Enables migration to TPM 2.0 features (hierarchical key management, algorithm agility); LPC option simplifies integration into x86-based platforms. | Select SLB9670 when future-proofing for TPM 2.0 compliance or requiring LPC interface; verify I²C timing compatibility with existing host driver. |
| Nuvoton NPCT750 | TPM 2.0 only; supports SPI and I²C; integrated SHA-256 and ECC acceleration; lower power in idle states. | Better suited for battery-powered devices needing extended low-power operation; lacks TPM 1.2 backward compatibility required for legacy OS support. | Choose NPCT750 for new designs targeting TPM 2.0 ecosystems and SPI-based hosts; not suitable for TPM 1.2-only environments. |
Compared with Infineon SLB9670 and Nuvoton NPCT750, the AT97SC3205T-X3A16-10 provides verified TPM 1.2 compliance with AVR-based programmability and FIPS-140-2 Level 2 certification-making it optimal for industrial systems requiring long-term stability, I²C-only integration, and regulatory validation without upgrading to TPM 2.0.
Availability
AT97SC3205T-X3A16-10 is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity attestation, hardware-based key vaulting, and physical presence-controlled operations requiring stable component supply across industrial lifecycle horizons.
Supply support for AT97SC3205T-X3A16-10 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 support for legacy Atmel security products including the AT97SC3205T series.
The AT97SC3205T-X3A16-10 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver TCG-compliant hardware root-of-trust for industrial, networking, and embedded computing platforms where firmware integrity and cryptographic key protection are mission-critical.
FAQ
What TPM specification version does the AT97SC3205T-X3A16-10 implement?
The AT97SC3205T-X3A16-10 implements the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification. It is not compatible with TPM 2.0 commands or features. All firmware, crypto engines, and command sets are validated against the TPM 1.2 standard, and its FIPS-140-2 Level 2 certification covers RNG, HMAC, AES, SHA, and RSA functions as defined in that specification. The AT97SC3205T-X3A16-10 remains fully compliant with legacy OS drivers and BIOS implementations requiring TPM 1.2.
Does the AT97SC3205T-X3A16-10 support both TSSOP and QFN packages, and how do they differ electrically?
Yes, the AT97SC3205T-X3A16-10 is offered in both 28-pin Thin TSSOP (28X1) and 32-pad QFN (32M3) packages. Electrically, both packages share identical pin functions, timing specifications, voltage ratings, and thermal performance across the -40°C to +85°C industrial range. The QFN variant includes an exposed center pad internally tied to GND, which must be soldered to system ground for optimal thermal dissipation and noise immunity. No functional or electrical trade-offs exist between packages-selection depends solely on board space, assembly capability, and thermal design requirements.
How is low-power operation managed in the AT97SC3205T-X3A16-10, and what is required to wake it?
The AT97SC3205T-X3A16-10 enters low-power sleep automatically during idle periods and supports deep-sleep mode via the TPM_DeepSleep command. To recover from deep-sleep, both TWI_Wakeup# pins (TSSOP Pin 7 & Pin 22; QFN Pin 7 & Pin 22) must be pulsed active-low simultaneously. This dual-signal requirement prevents accidental wake events. The AT97SC3205T-X3A16-10 does not support single-pin wake or automatic I²C activity-triggered wake-system firmware must explicitly manage the wake sequence per the Atmel-specific command protocol.
What is the purpose of the GPIO-Express-00 pin on the AT97SC3205T-X3A16-10, and how is it configured?
The GPIO-Express-00 pin on the AT97SC3205T-X3A16-10 is hard-mapped to TPM_NV_INDEX_GPIO_00, enabling direct non-volatile storage and retrieval of its logic state across power cycles without host software overhead. It features an internal pull-up resistor and defaults to input mode. When unused, it must be left floating-not tied-to avoid overriding the internal pull-up and causing unintended state reads. This pin is distinct from general-purpose GPIOs and is reserved exclusively for NV-indexed state persistence, making it ideal for storing boot-mode selections or hardware configuration flags in the AT97SC3205T-X3A16-10.
Is the AT97SC3205T-X3A16-10 FIPS-140-2 certified, and what modules are covered?
Yes, the AT97SC3205T-X3A16-10 is FIPS-140-2 Level 2 certified. The certification explicitly covers the hardware Random Number Generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines-including their implementation, key handling, and self-test mechanisms. Certification applies to the complete silicon die and embedded firmware stack, not just individual algorithms. This validation ensures the AT97SC3205T-X3A16-10 meets U.S. federal requirements for cryptographic modules used in regulated environments such as defense, finance, and critical infrastructure-wherever FIPS compliance is mandated.
AT97SC3205T-X3A16-10 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
AT97SC3205T-X3A16-10 FAQ
1.How can I place an order for AT97SC3205T-X3A16-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A16-10 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-X3A16-10 reliable?
The price and inventory of AT97SC3205T-X3A16-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A16-10 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-X3A16-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A16-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-X3A16-10?
AT97SC3205T-X3A16-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-X3A16-10 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-X3A16-10?
For technical support, including AT97SC3205T-X3A16-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A16-10 requirements.
6.How does Aetrix verify that AT97SC3205T-X3A16-10 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-X3A16-10 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-X3A16-10 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-X3A16-10?
All AT97SC3205T-X3A16-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A16-10, 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-X3A16-10 part is unused and in its original packaging.
Return procedure for AT97SC3205T-X3A16-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-X3A16-10 Tags
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