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Microchip Technology AT97SC3205T-X3A16-20
- Part No.:
- AT97SC3205T-X3A16-20
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-X3A16-20.pdf
- Description:
- IC CRYPTO TPM TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,232
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Product details
Overview
AT97SC3205T-X3A16-20 from Microchip (acquired 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 industrial embedded systems.
For engineers reviewing the AT97SC3205T-X3A16-20 datasheet, AT97SC3205T-X3A16-20 pinout, AT97SC3205T-X3A16-20 application, or AT97SC3205T-X3A16-20 equivalent, key selection considerations include I²C timing compliance, GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, TWI_Wakeup# dual-pin low-power recovery, and industrial temperature range (-40°C to +85°C) support.
Technical Context
The AT97SC3205T-X3A16-20 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 independent hardware engines for RSA, AES, SHA-1, HMAC, and a FIPS-140-2 validated PRNG used for key generation and protocol randomness.
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 requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK) and 50% duty cycle optimization for clock stability. The device enters automatic low-power sleep when idle and recovers only upon simultaneous active-low assertion of TWI_Wakeup# pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification compliant - enables standardized platform integrity measurement and attestation across OS and firmware layers. |
| I²C Interface Speed | Up to 400 kHz Fast Mode - requires precise 800 Ω pull-up on SM_DAT and 1.5 kΩ on SM_CLK for reliable high-speed communication. |
| Supply Voltage | 3.3 V nominal - mandates tight decoupling: 2200–4700 pF capacitor <5 mm from each VCC pin and 0.1 µF at VCC node <10 mm from device. |
| Temperature Range | -40°C to +85°C - qualified for industrial environments without derating; LRESET# must remain asserted until VCC stabilizes at power-up. |
| NV Storage Capacity | 2066 bytes user-defined data - allocated in TPM NV space, accessible via TCG commands like TPM_NV_Write and TPM_NV_Read. |
| Crypto Certification | FIPS-140-2 Level 2 certified - covers RNG, HMAC, AES, SHA, and RSA engines; validates cryptographic integrity for government and regulated applications. |
| 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) - both RoHS-compliant and lead-free. |
Pinout & Package
AT97SC3205T-X3A16-20 is available in two package variants: 28-pin Thin TSSOP (28X1, 4.40 mm × 9.70 mm body, 0.65 mm pitch) and 32-pad QFN (32M3, 4.00 mm × 4.00 mm body, 0.40 mm pitch). Both packages are RoHS-compliant and rated for industrial temperature operation (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3 V supply requiring localized decoupling: 2200–4700 pF cap <5 mm from each VCC pin and 0.1 µF at shared VCC node <10 mm from device. |
| GND | System Ground Reference | Reference for all analog/digital circuitry; QFN center pad internally tied to GND and may be left floating or connected externally. |
| LRESET# | Active-Low Reset Input | Pulsing low resets internal TPM state; minimum pulse width 2 µs; must be held active until VCC stabilizes at power-up. |
| SM_DAT / SM_CLK | I²C Data/Clock Interface | Bi-directional I²C bus lines supporting 100/400 kHz; require external pull-ups (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK) for Fast Mode reliability. |
| GPIO-Express-00 | Dedicated NV Index Pin | Hard-mapped to TPM_NV_INDEX_GPIO_00; internal pull-up enabled; default input mode; leave floating if unused. |
| PP/GPIO | Physical Presence Indicator | Hardware physical presence signal (active-high); internal pull-down enabled; used for secure admin command authorization. |
| TWI_Wakeup# (Pins 7 & 22) | Low-Power Recovery Trigger | Both pins must be pulsed low simultaneously to exit deep sleep; pin 22 must be tied to GND or VCC; pin 7 may float or tie to GND. |
| PIRQ# | SPI Interrupt Request Output | Active-low interrupt signal indicating TPM event completion; must be pulled to GND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Single-Chip TPM 1.2 Solution | Integrates AVR CPU, crypto engines, EEPROM, RNG, and security logic in one die - eliminates multi-chip integration risk and reduces BOM count. |
| FIPS-140-2 Certified Crypto Suite | Validated RNG, AES, SHA-1, HMAC, and RSA engines enable compliance with federal and enterprise security policies without external validation effort. |
| Hardware Asymmetric Crypto Engine | Offloads RSA key generation and signing from host CPU - reduces latency and prevents software-based side-channel leakage of private keys. |
| 2066-Byte User NV Storage | Dedicated non-volatile memory space accessible via standard TCG commands - supports secure storage of platform-specific credentials or policy data. |
| Industrial Temperature Support | Qualified from -40°C to +85°C with full functionality - suitable for factory automation, edge gateways, and ruggedized embedded platforms. |
Applications
| Secure Boot Authentication | Platform Integrity Measurement |
|---|---|
Use Scenario: Verifying firmware signature and hash chain before loading bootloader or OS kernel in industrial controllers. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; measures BIOS, bootloader, and kernel hashes into Platform Configuration Registers (PCRs) during boot sequence. Use Value: Prevents unauthorized firmware execution by cryptographically binding boot components to hardware identity using AT97SC3205T-X3A16-20's RSA engine and secure NV storage. | Use Scenario: Monitoring runtime integrity of critical firmware modules in medical diagnostic equipment. IC Role / Device Role / Timing Role: TPM continuously extends PCR values with hash of firmware updates or configuration changes via TCG Extend command. Use Value: Enables tamper-evident logging of system state changes using AT97SC3205T-X3A16-20's FIPS-certified SHA-1 engine and persistent PCR storage. |
| Hardware Physical Presence Control | Secure Credential Storage |
Use Scenario: Enforcing administrator approval for TPM owner authorization or dictionary attack lockout reset in network appliances. IC Role / Device Role / Timing Role: PP/GPIO pin serves as hardware-asserted physical presence signal required to execute privileged TCG commands. Use Value: Mitigates remote privilege escalation by requiring local hardware confirmation - implemented via AT97SC3205T-X3A16-20's dedicated PP/GPIO with internal pull-down. | Use Scenario: Storing encrypted device certificates and TLS private keys in edge IoT gateways with limited flash endurance. IC Role / Device Role / Timing Role: TPM provides isolated, wear-levelled NV storage for cryptographic keys, accessed only through authenticated TCG commands. Use Value: Extends flash lifetime and prevents key extraction via AT97SC3205T-X3A16-20's 2066-byte user NV space and hardware-enforced access control. |
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 both I²C and SPI interfaces; larger 4 kB NV storage; requires external 1.8 V supply for core logic in addition to 3.3 V I/O. | Enables flexible host interface choice and higher credential density but increases power design complexity. | Select when SPI interface or >2 kB NV space is required; verify dual-supply sequencing and thermal derating for industrial use. |
| Nuvoton NPCT750KB0GX | TPM 2.0 compliant; includes ECC acceleration; supports 1.8 V/3.3 V dual I/O voltage; smaller 4 × 4 mm QFN-32 package. | Provides forward-compatible crypto agility and lower power consumption but lacks TPM 1.2 legacy compatibility. | Select for new designs targeting TPM 2.0 adoption; avoid if existing firmware relies on TPM 1.2-specific commands or structures. |
Compared with SLB9665TT2.0 and NPCT750KB0GX, the AT97SC3205T-X3A16-20 offers verified TPM 1.2 compliance with minimal external components, fixed 3.3 V single-supply operation, and industrial-grade qualification - making it optimal for cost-sensitive, legacy-compatible embedded security deployments.
Availability
AT97SC3205T-X3A16-20 is available at Aetrix Electronics and suitable for industrial control systems, secure edge gateways, and medical diagnostics equipment requiring stable component supply, long-term lifecycle assurance, and TCG-compliant hardware root-of-trust.
Supply support for AT97SC3205T-X3A16-20 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. The company specializes in microcontrollers, analog, FPGA, and trusted computing solutions with global manufacturing and quality infrastructure.
The AT97SC3205T-X3A16-20 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems requiring hardware-enforced platform integrity and secure credential storage.
FAQ
What is the operating temperature range supported by the AT97SC3205T-X3A16-20?
The AT97SC3205T-X3A16-20 is qualified for industrial operation from -40°C to +85°C. This rating applies to both the 28-pin Thin TSSOP and 32-pad QFN package variants. Full electrical performance, including I²C timing compliance and crypto engine functionality, is guaranteed across this range without derating. Thermal design must ensure PCB layout avoids localized hot spots exceeding +85°C at the device body.
Does the AT97SC3205T-X3A16-20 support TPM 2.0 or only TPM 1.2?
The AT97SC3205T-X3A16-20 implements only the Trusted Computing Group (TCG) TPM Version 1.2 Specification. It does not support TPM 2.0 features such as ECC acceleration, algorithm agility, or hierarchical key structures. Firmware and host drivers must be built for TPM 1.2 command sets and data structures. For TPM 2.0 migration, consider Microchip's newer TPM offerings like the TPM2.0-compliant ATTPM20 series.
How is low-power sleep managed on the AT97SC3205T-X3A16-20?
The AT97SC3205T-X3A16-20 automatically enters low-power sleep when idle, with no host intervention required. Recovery requires simultaneous active-low pulses on both TWI_Wakeup# pins (TSSOP Pin 7 and Pin 22; QFN Pin 7 and Pin 22). Pin 22 must be tied to GND or VCC; Pin 7 may float or tie to GND. This dual-pin requirement prevents accidental wake-up and ensures deterministic low-power behavior in noisy industrial environments.
What are the I²C pull-up resistor requirements for reliable 400 kHz operation with the AT97SC3205T-X3A16-20?
For stable 400 kHz Fast Mode I²C operation, the AT97SC3205T-X3A16-20 requires 800 Ω pull-up resistors on SM_DAT and 1.5 kΩ on SM_CLK. These values were validated in Atmel's reference designs. Deviations may cause timing violations or bus contention. Additionally, SM_CLK duty cycle should be as close to 50% as possible - especially critical at 400 kHz but beneficial even at lower speeds.
Is the AT97SC3205T-X3A16-20 FIPS-140-2 certified, and what modules are covered?
Yes, the AT97SC3205T-X3A16-20 is FIPS-140-2 Level 2 certified. The certification explicitly covers the hardware Random Number Generator (RNG), HMAC, AES, SHA-1, and RSA cryptographic engines. This validation was performed per NIST requirements and applies to the complete silicon die - not just firmware or software layers. Certification documentation is available under NDA from Microchip.
AT97SC3205T-X3A16-20 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-X3A16-20 FAQ
1.How can I place an order for AT97SC3205T-X3A16-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A16-20 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-X3A16-20 reliable?
The price and inventory of AT97SC3205T-X3A16-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A16-20 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-X3A16-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A16-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-X3A16-20?
AT97SC3205T-X3A16-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-X3A16-20 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-X3A16-20?
For technical support, including AT97SC3205T-X3A16-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A16-20 requirements.
6.How does Aetrix verify that AT97SC3205T-X3A16-20 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-X3A16-20 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-X3A16-20 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-X3A16-20?
All AT97SC3205T-X3A16-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A16-20, 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-X3A16-20 part is unused and in its original packaging.
Return procedure for AT97SC3205T-X3A16-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-X3A16-20 Tags
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