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Microchip Technology AT97SC3205T-U3A1420B
- Part No.:
- AT97SC3205T-U3A1420B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-U3A1420B.pdf
- Description:
- MEM FF IND I2C TPM 28TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205T-U3A1420B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware RSA crypto engine, FIPS-140-2 certified RNG/AES/SHA/HMAC 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 computing systems.
For engineers reviewing the AT97SC3205T-U3A1420B datasheet, AT97SC3205T-U3A1420B pinout, AT97SC3205T-U3A1420B application, or AT97SC3205T-U3A1420B equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed GPIO-Express and physical presence pin functions, package-specific pin mappings for both 28-pin TSSOP and 32-pin QFN, and FIPS-140-2 module certification scope details.
Technical Context
The AT97SC3205T-U3A1420B implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, session management, and cryptographic acceleration via dedicated hardware engines. Its internal EEPROM stores RSA keys and supports TPM_FlushSpecific/TPM_LoadKey2 operations without host intervention.
It features dual low-power recovery paths via TWI_Wakeup# pins and supports hardware Physical Presence assertion through the PP/GPIO pin. The device uses dynamic internal memory management for key caching and provides a 50% duty-cycle-sensitive I²C clock input (SM_CLK) with validated pull-up recommendations (1.5kΩ) for stable 400kHz operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation per TCG Main Specification Parts 1–3 |
| I²C Interface Speed | 400kHz Fast Mode or 100kHz Standard Mode; requires 1.5kΩ SM_CLK and 800Ω SM_DAT pull-ups for reliable high-speed operation |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC, AES, SHA-1, and RSA (1024/2048-bit) hardware accelerators |
| Nonvolatile Storage | 2066 bytes of user-defined NV space; internal EEPROM stores RSA keys with automatic cache management |
| Supply Voltage | 3.3V ±5%; requires 2200–4700pF decoupling capacitors within 5mm of each VCC pin and 0.1μF at VCC node |
| Operating Temperature | Industrial range: −40°C to +85°C; validated for continuous operation across full range with thermal derating |
| 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-U3A1420B is offered in two RoHS-compliant, lead-free packages: 28-pin Thin TSSOP (28X1) and 32-pad Very Thin QFN (32M3). Both support industrial temperature range and share identical functional pin mapping with mechanical differences in pin count and layout. No-connect (NC) pins are explicitly listed per package and may be left floating, tied to VCC, or grounded per design requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V main supply; requires localized 2200–4700pF bypass caps within 5mm of each VCC pin and 0.1μF at common node |
| GND | System Ground Reference | Ground return for all analog/digital circuits; QFN center pad internally tied to GND and may be left floating or connected |
| LRESET# | Active-Low Reset Input | Minimum 2μs pulse required; must remain asserted until VCC stabilizes on power-up |
| SM_DAT / SM_CLK | I²C Data/Clock Interface | Open-drain bidirectional data line and clock input; 400kHz operation requires precise pull-up sizing (800Ω/1.5kΩ) and 50% duty cycle |
| PP/GPIO | Hardware Physical Presence | Active-high indicator for physical presence assertion; internal pull-down; leave floating if unused |
| GPIO-Express-00 | TPM-NV Mapped GPIO | Assigned to TPM_NV_INDEX_GPIO_00; internal pull-up; default input mode; serves as XOR chain output during I/O test |
| TWI_Wakeup# | Low-Power Recovery Trigger | Two-pin active-low wakeup mechanism for TPM_DeepSleep recovery; both pins must be pulsed low simultaneously |
| PIRQ# | Interrupt Request Output | Open-drain interrupt signal to host processor; tie to GND via 4.7kΩ if unused |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates AVR CPU, crypto engines, RNG, EEPROM, and I²C interface in one die-no external components required for core TPM functionality |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines; validates cryptographic integrity and physical tamper resistance for government and enterprise deployments |
| Dynamic key cache management | Automatically handles RSA key loading/unloading via TPM_FlushSpecific and TPM_LoadKey2-no host firmware overhead for key lifecycle |
| Dual-package compatibility | Identical register map and pin function across 28-pin TSSOP and 32-pin QFN-enables footprint flexibility without firmware changes |
| Hardware Physical Presence support | PP/GPIO pin enables BIOS-level enforcement of physical access requirements before sensitive TPM operations (e.g., clearing owner hierarchy) |
Applications
| Secure Boot Authentication | Platform Integrity Verification |
|---|---|
Use Scenario: Verifying firmware signature and measuring boot sequence integrity during system startup in industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, storing PCR values and signing boot logs via RSA-2048; responds to host I²C queries within <10ms latency. Use Value: Prevents unauthorized firmware execution by cryptographically binding boot measurements to hardware identity-enabling remote attestation with verifiable chain-of-trust. | Use Scenario: Detecting runtime tampering in medical imaging controllers where software updates must preserve regulatory compliance. IC Role / Device Role / Timing Role: Monitors critical memory regions via periodic PCR extension; triggers PIRQ# interrupt on hash mismatch; operates continuously at 3.3V with <50μA sleep current. Use Value: Provides real-time, hardware-enforced detection of unauthorized code injection or memory corruption-meeting IEC 62304 Class C software safety requirements. |
| Hardware-Based Key Management | Remote Attestation Endpoint |
Use Scenario: Storing and protecting TLS private keys for secure cloud connectivity in smart grid edge devices. IC Role / Device Role / Timing Role: Host offloads RSA key generation and signing to AT97SC3205T-U3A1420B's hardware engine; NV storage retains keys across power cycles. Use Value: Eliminates software-based key exposure risk-private keys never leave the TPM boundary, satisfying NIST SP 800-57 Part 1 key protection requirements. | Use Scenario: Enabling zero-touch provisioning of IoT gateways in enterprise networks requiring identity proof before network admission. IC Role / Device Role / Timing Role: Generates signed quotes containing platform configuration registers (PCRs); transmits via I²C to host MCU for TLS handshake with cloud service. Use Value: Delivers cryptographically verifiable proof of unmodified firmware state-reducing onboarding time by >70% versus manual certificate enrollment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM 1.2 security applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9665TT2.0 | Supports TPM 2.0 and LPC interface; lacks AVR CPU but adds ECC acceleration; 32-pin QFN only | Required for Windows 11 compliance and modern UEFI firmware; not backward-compatible with legacy TPM 1.2-only BIOS stacks | Select when upgrading to TPM 2.0 mandates or ECC-based key exchange is needed; avoid for existing TPM 1.2 designs. |
| Nuvoton NPCT750YAXX | TPM 1.2 compliant; SPI interface instead of I²C; integrated voltage supervisor; same 3.3V supply and industrial temp range | Better suited for space-constrained designs using SPI master peripherals; requires different driver stack and interrupt handling logic | Choose for SPI-native host platforms or where built-in brown-out detection adds system-level robustness. |
Compared with Infineon SLB9665TT2.0 and Nuvoton NPCT750YAXX, the AT97SC3205T-U3A1420B offers native I²C integration, on-die AVR processing for custom command extensions, and validated 400kHz timing margins-making it optimal for cost-sensitive embedded systems already using I²C infrastructure and requiring TPM 1.2 interoperability.
Availability
AT97SC3205T-U3A1420B is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity verification, and hardware-based key management requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for AT97SC3205T-U3A1420B 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. The company specializes in microcontrollers, analog, and security ICs for industrial, automotive, and communications markets.
The AT97SC3205T-U3A1420B belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems needing hardware-rooted trust without external crypto co-processors.
FAQ
What is the primary interface protocol supported by the AT97SC3205T-U3A1420B?
The AT97SC3205T-U3A1420B supports only the I²C interface, operating at 400kHz Fast Mode or 100kHz Standard Mode. It does not support SPI, LPC, or other bus protocols. Pull-up resistors of 800Ω on SM_DAT and 1.5kΩ on SM_CLK are validated for stable 400kHz communication. The AT97SC3205T-U3A1420B requires strict adherence to I²C timing specifications-including 50% SM_CLK duty cycle-to ensure reliable command/response transactions in production environments.
Does the AT97SC3205T-U3A1420B support TPM 2.0 functionality?
No, the AT97SC3205T-U3A1420B implements only the TCG TPM 1.2 specification and is not compatible with TPM 2.0 commands, structures, or algorithms. It lacks support for ECC cryptography, hierarchical authorization, or the new command set introduced in TPM 2.0. For TPM 2.0 compliance, designers must select alternatives such as the Infineon SLB9665TT2.0. The AT97SC3205T-U3A1420B remains fully functional in legacy BIOS/UEFI environments requiring TPM 1.2 for Windows 10 and earlier OS versions.
How is nonvolatile storage allocated in the AT97SC3205T-U3A1420B?
The AT97SC3205T-U3A1420B provides 2066 bytes of user-defined NV storage space accessible via TCG-defined NV write/read commands. In addition, internal EEPROM stores RSA keys and TPM state data with automatic cache management-requiring no host intervention for key loading or flushing. The AT97SC3205T-U3A1420B enforces NV write locking per index and supports wear leveling across the EEPROM array to ensure >100,000 write cycles over the device lifetime.
What are the power supply requirements and decoupling guidelines for the AT97SC3205T-U3A1420B?
The AT97SC3205T-U3A1420B requires a clean 3.3V ±5% supply with tight noise control. Atmel specifies 2200–4700pF ceramic decoupling capacitors placed within 5mm of each VCC pin and a 0.1μF capacitor at the VCC node junction, located within 10mm of the device. All capacitors must use X5R or X7R dielectrics. The AT97SC3205T-U3A1420B enters low-power sleep automatically during idle periods, drawing <50μA, and recovers via TWI_Wakeup# without host clock gating.
Is the AT97SC3205T-U3A1420B certified to FIPS-140-2, and what modules are covered?
Yes, the AT97SC3205T-U3A1420B is FIPS-140-2 Level 2 certified, covering its hardware Random Number Generator (RNG), HMAC, AES, SHA-1, and RSA cryptographic engines. Certification includes validation of physical security mechanisms, role-based access control, and key management lifecycle. The AT97SC3205T-U3A1420B certificate applies to the complete module-not individual sub-blocks-and confirms conformance to FIPS PUB 140-2 Annex A requirements for cryptographic module validation.
AT97SC3205T-U3A1420B 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-U3A1420B FAQ
1.How can I place an order for AT97SC3205T-U3A1420B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A1420B 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-U3A1420B reliable?
The price and inventory of AT97SC3205T-U3A1420B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A1420B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-U3A1420B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A1420B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-U3A1420B?
AT97SC3205T-U3A1420B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-U3A1420B 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-U3A1420B?
For technical support, including AT97SC3205T-U3A1420B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A1420B requirements.
6.How does Aetrix verify that AT97SC3205T-U3A1420B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-U3A1420B 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-U3A1420B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-U3A1420B?
All AT97SC3205T-U3A1420B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A1420B, 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-U3A1420B part is unused and in its original packaging.
Return procedure for AT97SC3205T-U3A1420B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-U3A1420B Tags
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CYPD3175-24LQXQ
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SLB9672VU20FW1523XTMA1
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SLB9670VQ20FW785XTMA1
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AT97SC3204-U2A1A-20
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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