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Microchip Technology AT97SC3205T-X3A14-20
- Part No.:
- AT97SC3205T-X3A14-20
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-X3A14-20.pdf
- Description:
- IC CRYPTO TPM TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,305
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Product details
Overview
AT97SC3205T-X3A14-20 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based asymmetric cryptography, 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), housed in a 28-pin Thin TSSOP package for embedded platform root-of-trust applications.
For engineers reviewing the AT97SC3205T-X3A14-20 datasheet, AT97SC3205T-X3A14-20 pinout, AT97SC3205T-X3A14-20 application, or AT97SC3205T-X3A14-20 equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed TPM 1.2 functional compliance, and precise pin-level design guidance for secure boot, key attestation, and firmware integrity verification.
Technical Context
The AT97SC3205T-X3A14-20 integrates an AVR® 8-bit RISC microprocessor with dedicated crypto hardware acceleration, enabling full TCG TPM 1.2 command execution without host CPU offload. Its internal EEPROM stores RSA keys, while the FIPS-140-2 certified RNG feeds cryptographic operations and supports system-level random number requests.
Communication occurs exclusively via I²C (SM_DAT/SM_CLK), supporting 100kHz Standard Mode and 400kHz Fast Mode with strict pull-up requirements (800Ω on SM_DAT, 1.5kΩ on SM_CLK) and 50% duty-cycle clock optimization. Low-power sleep recovery requires coordinated TWI_Wakeup# pin pulsing, and physical presence detection is handled through the PP/GPIO pin with internal pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification compliant - enables standardized secure boot, remote attestation, and sealed storage in PC/embedded platforms. |
| I²C Interface Speed | 400kHz Fast Mode / 100kHz Standard Mode - defines maximum host communication bandwidth and timing margin for secure command exchange. |
| Supply Voltage | 3.3V ±5% - mandates tight regulation and decoupling (2200–4700pF caps within 5mm of each VCC pin) to prevent crypto engine faults. |
| NV User Storage | 2066 bytes - provides persistent space for OEM-specific credentials, certificates, or policy data outside standard TPM NV indices. |
| Crypto Certification | FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, RSA - validates cryptographic integrity for government and regulated industry deployments. |
| Operating Temperature | -40°C to +85°C - supports industrial-grade reliability in extended-temperature embedded systems without derating. |
| Package Type | 28-pin Thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) - surface-mount compatible with standard reflow profiles and automated assembly. |
Pinout & Package
AT97SC3205T-X3A14-20 is packaged in a 28-pin Thin TSSOP (28X1) with 4.4 mm body width, 9.7 mm length, and 0.65 mm lead pitch. The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V main supply requiring local 2200–4700pF decoupling ≤5mm from each pin; multiple VCC pins enable distributed power delivery. |
| GND | System Ground Reference | Multiple GND pins provide low-impedance return paths; adjacent placement to VCC pins ensures stable power rail integrity. |
| LRESET# | Active-Low Reset Input | Minimum 2μs pulse required; must remain asserted until VCC stabilizes at power-up to guarantee deterministic TPM initialization. |
| SM_DAT | I²C Bidirectional Data Line | Open-drain interface requiring external 800Ω pull-up for reliable 400kHz operation; noise-sensitive-requires controlled trace routing. |
| SM_CLK | I²C Clock Input | Requires 1.5kΩ pull-up and near-50% duty cycle for optimal timing margin at 400kHz; jitter directly impacts command timeout behavior. |
| PP/GPIO | Physical Presence Indicator | Active-high hardware signal with internal pull-down; used to authorize sensitive TPM commands (e.g., dictionary attack lockout reset). |
| TWI_Wakeup# | Low-Power Sleep Recovery | Two dedicated pins (TSSOP pins 7 & 22) must both be pulsed low to exit deep sleep-prevents spurious wake events. |
| PIRQ# | SPI Interrupt Request Output | Active-low interrupt signal indicating TPM event completion; requires 4.7kΩ pull-down if unused to avoid floating input states. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | Offloads RSA key generation, signing, and decryption from host CPU-reducing latency and eliminating software-side side-channel exposure. |
| Internal EEPROM for RSA Keys | Secure non-volatile storage isolated from host access-ensures private keys never leave the TPM boundary during lifecycle operations. |
| FIPS-140-2 Certified RNG | Validated entropy source meeting NIST SP 800-90A requirements-enables cryptographically strong key material for TLS, disk encryption, and attestation. |
| GPIO-Express-00 Mapping | Dedicated NV index (TPM_NV_INDEX_GPIO_00) with internal pull-up-supports tamper-evident GPIO state logging without external bias components. |
| XTAMPER Support via TestBI/GPIO | Configurable tamper-detection input using same pin as GPIO-enables hardware-based intrusion response when paired with external sensors. |
Applications
| Server Boot Integrity | Industrial HMI Security |
|---|---|
Use Scenario: Verifying firmware signature and measuring boot sequence before OS load in rack-mounted servers. IC Role / Device Role / Timing Role: Root-of-trust anchor performing PCR extension, sealed storage, and TPM_Quote command execution during pre-boot environment. Use Value: Prevents unauthorized firmware modification by binding measurements to hardware-bound keys stored in AT97SC3205T-X3A14-20 EEPROM. | Use Scenario: Securing operator login and configuration changes on factory-floor HMIs exposed to untrusted networks. IC Role / Device Role / Timing Role: Cryptographic service provider handling credential validation, session key derivation, and audit log signing via I²C. Use Value: Enables FIPS-validated AES encryption of credentials and SHA-256 hashing of configuration deltas using AT97SC3205T-X3A14-20 certified engines. |
| Medical Device Authentication | Network Appliance Key Management |
Use Scenario: Authenticating peripheral devices (e.g., diagnostic probes) before enabling data transfer in FDA-regulated equipment. IC Role / Device Role / Timing Role: TPM 1.2-compliant identity provider issuing EK-certified challenge-response attestations over I²C. Use Value: Meets IEC 62304 security requirements by leveraging AT97SC3205T-X3A14-20 FIPS-140-2 RNG and RSA signing for device identity binding. | Use Scenario: Storing and managing TLS private keys for HTTPS termination in enterprise firewalls and SD-WAN gateways. IC Role / Device Role / Timing Role: Secure key vault executing TPM_LoadKey2 and TPM_Seal commands to protect keys from extraction or cloning. Use Value: Guarantees key confidentiality using AT97SC3205T-X3A14-20 hardware-isolated EEPROM and authenticated command pathways. |
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 and LPC interface in addition to I²C; larger 32-pin QFN footprint; higher max I²C speed (1MHz) | Required for new designs targeting TPM 2.0 compliance; LPC support enables legacy x86 platform integration | Select SLB9665TT2.0 when upgrading to TPM 2.0 or needing LPC fallback; AT97SC3205T-X3A14-20 remains optimal for cost-sensitive TPM 1.2 I²C-only designs. |
| Nuvoton NPCT750YAXX | TPM 1.2 compliant with identical I²C interface; smaller 5×5 mm QFN package; no GPIO-Express-00 or XTAMPER functionality | Lacks dedicated tamper inputs and express GPIO mapping-limits use in physically secured or sensor-integrated systems | Choose NPCT750YAXX for space-constrained boards where tamper detection is not required; retain AT97SC3205T-X3A14-20 when GPIO-Express-00 or XTAMPER support is needed. |
Compared with SLB9665TT2.0 and NPCT750YAXX, the AT97SC3205T-X3A14-20 uniquely combines TPM 1.2 compliance, FIPS-140-2 certification, GPIO-Express-00 mapping, and XTAMPER capability in a compact TSSOP package-making it ideal for industrial and medical devices requiring field-proven security with minimal board area.
Availability
AT97SC3205T-X3A14-20 is available at Aetrix Electronics and suitable for server boot integrity, industrial HMI security, medical device authentication, and network appliance key management requiring stable component supply and long-term lifecycle support.
Supply support for AT97SC3205T-X3A14-20 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 product line delivers certified TPM 1.2 functionality for embedded systems requiring hardware-rooted trust, secure key storage, and FIPS-validated cryptographic operations in industrial, medical, and networking applications.
FAQ
What is the primary function of the AT97SC3205T-X3A14-20 in a secure embedded system?
The AT97SC3205T-X3A14-20 serves as a hardware-rooted trust anchor implementing the TCG TPM 1.2 specification. It performs cryptographic operations-including RSA key generation, digital signing, and FIPS-140-2 certified RNG/AES/SHA functions-while securely storing keys in internal EEPROM. Its role is to ensure boot integrity, enable remote attestation, and protect sensitive data in systems where software-only security is insufficient.
Does the AT97SC3205T-X3A14-20 support both commercial and industrial temperature ranges?
Yes, the AT97SC3205T-X3A14-20 is qualified for industrial operation from -40°C to +85°C, as confirmed in the Atmel ordering information. This makes it suitable for deployment in harsh environments such as factory automation controllers, outdoor networking gear, and medical diagnostics equipment where thermal stability is critical for cryptographic reliability.
How does the AT97SC3205T-X3A14-20 handle low-power states and wake-up recovery?
The AT97SC3205T-X3A14-20 enters low-power mode automatically during idle periods. To recover, two dedicated pins-TWI_Wakeup# (TSSOP pin 7 and pin 22)-must both be pulsed active-low. This dual-signal requirement prevents accidental wake events and ensures deterministic resumption of I²C communication after deep sleep, preserving system-level power budgets without compromising security responsiveness.
What are the I²C pull-up resistor values recommended for reliable 400kHz operation with the AT97SC3205T-X3A14-20?
For stable 400kHz Fast Mode I²C communication, the AT97SC3205T-X3A14-20 datasheet specifies 800Ω on SM_DAT and 1.5kΩ on SM_CLK. These values were validated under worst-case trace capacitance and noise conditions. Deviating significantly may cause setup/hold violations or bus arbitration failures-especially when combined with non-50% duty-cycle clocks.
Can the AT97SC3205T-X3A14-20 store custom user data, and how much space is available?
Yes, the AT97SC3205T-X3A14-20 provides 2066 bytes of non-volatile user-defined storage space in its internal EEPROM. This area is separate from standard TPM NV indices and is accessible via vendor-specific commands for OEM-specific credentials, calibration data, or policy configurations-enabling customization without interfering with core TPM 1.2 functionality.
AT97SC3205T-X3A14-20 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-X3A14-20 FAQ
1.How can I place an order for AT97SC3205T-X3A14-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A14-20 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-X3A14-20 reliable?
The price and inventory of AT97SC3205T-X3A14-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A14-20 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-X3A14-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A14-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-X3A14-20?
AT97SC3205T-X3A14-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-X3A14-20 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-X3A14-20?
For technical support, including AT97SC3205T-X3A14-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A14-20 requirements.
6.How does Aetrix verify that AT97SC3205T-X3A14-20 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-X3A14-20 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-X3A14-20 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-X3A14-20?
All AT97SC3205T-X3A14-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A14-20, 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-X3A14-20 part is unused and in its original packaging.
Return procedure for AT97SC3205T-X3A14-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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