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Microchip Technology AT97SC3205-X3A12-20
- Part No.:
- AT97SC3205-X3A12-20
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205-X3A12-20.pdf
- Description:
- IC CRYPTO TPM 28TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205-X3A12-20 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based cryptographic functions for PC and embedded platform root-of-trust. It integrates an AVR RISC microprocessor, FIPS-140-2 certified RNG, AES/SHA/RSA engines, 2066-byte NV user storage, and SPI interface up to 45MHz - deployed in BIOS-secured boot chains and firmware integrity verification.
For engineers reviewing the AT97SC3205-X3A12-20 datasheet, AT97SC3205-X3A12-20 pinout, AT97SC3205-X3A12-20 application, or AT97SC3205-X3A12-20 equivalent, key selection criteria include TCG 1.2 compliance, SPI TIS 1.3 interface timing, industrial temperature support (-40°C to +85°C), internal EEPROM key storage, and physical tamper detection via XTamper pin.
Technical Context
The AT97SC3205-X3A12-20 implements a dedicated TPM 1.2 stack with hardware-accelerated RSA key generation (2048-bit), SHA-1 hashing, HMAC authentication, and AES encryption - all validated under FIPS-140-2 Level 2. Its AVR CPU executes immutable firmware stored in on-chip EEPROM, isolating crypto operations from host OS interference.
It operates exclusively over SPI with active-low PIRQ# interrupt signaling and supports hardware Physical Presence (PP/GPIO) assertion for privileged command authorization. The chip enters automatic low-power idle mode when inactive, requiring no system-level power management intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM Specification v1.2 and PC Client-Specific TIS v1.3 - ensures interoperability with Windows BitLocker, Linux tpm-tools, and UEFI Secure Boot stacks. |
| SPI Interface | Up to 45MHz clock rate (24–33MHz typical PC range); supports full-duplex MISO/MOSI with active-low CS# and RST# - enables direct connection to chipset southbridge SPI controllers. |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC, AES-128, SHA-1, and RSA-2048 - provides hardware-enforced key generation, sealing, and attestation without software-side entropy or algorithm implementation. |
| Nonvolatile Storage | 2066 bytes of user-defined NV space + internal EEPROM for RSA keys - persists credentials across reboots and enables secure key binding to platform configuration. |
| Supply & Temp | 3.3V ±10% supply with strict decoupling requirements (2200–4700pF near VCC pins); rated for -40°C to +85°C industrial operation - suitable for ruggedized client and edge compute platforms. |
| Package Options | 28-pin thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) and 32-pad QFN (4.0 × 4.0 × 0.9 mm, 0.4 mm pitch) - both RoHS-compliant, lead-free, and compatible with standard SMT reflow profiles. |
Pinout & Package
AT97SC3205-X3A12-20 is available in two RoHS-compliant packages: 28-pin thin TSSOP (28X1) and 32-pad QFN (32M3). Both support industrial temperature range (-40°C to +85°C) and require precise PCB layout per decoupling and noise control guidelines in the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V main supply; requires local 2200–4700pF bypass capacitor within 5mm of each VCC pin and adjacent GND - critical for RNG stability and TCG compliance. |
| GND | System Ground Reference | Multiple GND pins distributed across package; substrate center pad of QFN tied internally to GND - mandatory for EMI suppression and thermal dissipation. |
| MISO / MOSI / SPI_CLK / SPI_CS# / SPI_RST# | SPI Bus Interface | Full-duplex slave interface compliant with TIS 1.3; SPI_CS# and SPI_RST# are active-low and must be connected to system reset logic for TPM_Init sequence. |
| PIRQ# | Interrupt Output | Active-low open-drain interrupt signal asserted during command completion or error - requires external pull-up or tie to GND via 4.7kΩ if unused. |
| PP/GPIO | Physical Presence Indicator | Hardware-asserted input for privileged commands (e.g., Clear Owner); internal pull-down - must be driven high by system button or GPIO to authorize sensitive operations. |
| XTamper / TestBI/GPIO | Tamper Detection Input | Active-high external tamper event input; shares pin with disabled test function - enables hardware-triggered lockout on enclosure breach or voltage glitch. |
| GPIO Express-00 | Configurable GPIO | Internal pull-up; mapped to TPM_NV_INDEX_GPIO_00 - used for platform-specific status signaling or as XOR chain output during I/O test mode. |
Key Features
| Feature | Design Value |
|---|---|
| TCG 1.2 + TIS 1.3 Compliance | Guarantees interoperability with industry-standard TPM drivers, BIOS implementations, and OS security stacks - eliminates custom firmware integration effort. |
| FIPS-140-2 Level 2 Certification | Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies federal and enterprise procurement requirements for cryptographic module validation. |
| Integrated AVR RISC Core | Executes immutable, pre-flashed TPM firmware - prevents runtime code injection and enforces strict separation between host and security domain. |
| 2066-Byte User NV Storage | Dedicated nonvolatile memory space accessible only via authenticated TPM commands - enables secure storage of platform-specific keys, certificates, or policy data. |
| Hardware Physical Presence | PP/GPIO pin enforces human-authorized execution of destructive commands (e.g., TPM_Clear) - meets TCG requirement for out-of-band privilege escalation control. |
Applications
| PC BIOS Security | Industrial Edge Device Authentication |
|---|---|
|
Use Scenario: UEFI firmware validates boot image hash before loading OS kernel in corporate desktops and laptops. IC Role / Device Role / Timing Role: Root-of-trust anchor performing SHA-1 hashing and RSA signature verification during Power-On Self-Test (POST). Use Value: Prevents unauthorized firmware modification and ensures boot chain integrity without host CPU involvement or software vulnerability exposure. |
Use Scenario: Remote field gateway authenticates firmware updates over cellular link before applying patch in oil-and-gas SCADA systems. IC Role / Device Role / Timing Role: Secure key vault and cryptographic engine verifying update signatures using stored RSA public keys. Use Value: Enables zero-touch, cryptographically enforced OTA updates with rollback protection and tamper-evident logging. |
| Server Platform Integrity | Medical Device Data Sealing |
|
Use Scenario: Hypervisor measures guest VM launch parameters and seals them to TPM NV storage in cloud infrastructure servers. IC Role / Device Role / Timing Role: Hardware-secured attestation endpoint generating quote structures with PCR values and signing with endorsement key. Use Value: Provides verifiable proof of runtime state to remote auditors - essential for PCI-DSS and HIPAA-compliant virtualized environments. |
Use Scenario: Portable ultrasound device encrypts patient DICOM images using AES keys sealed to AT97SC3205-X3A12-20 NV storage before SD card write. IC Role / Device Role / Timing Role: Cryptographic co-processor managing key derivation, encryption, and secure erase of sensitive health records. Use Value: Meets FDA cybersecurity guidance for protected health information (PHI) confidentiality and audit trail integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM security applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9670 | TPM 2.0 compliant; supports SHA-256, ECC, and PCR extend operations not present in AT97SC3205-X3A12-20's TPM 1.2 stack. | Required for Windows 11 and newer UEFI platforms mandating TPM 2.0; incompatible with legacy TIS 1.3-only BIOS. | Select SLB9670 when upgrading to TPM 2.0 mandates or needing elliptic curve cryptography; retain AT97SC3205-X3A12-20 for cost-sensitive TPM 1.2 deployments. |
| Nuvoton NPCT750 | TPM 1.2 + TIS 1.3 compliant; identical SPI interface and pinout but lacks FIPS-140-2 certification for RNG and crypto engines. | Suitable for non-regulated commercial PCs where formal crypto validation is not required; lower BOM cost. | Choose NPCT750 for budget OEM builds without FIPS compliance needs; select AT97SC3205-X3A12-20 where government or healthcare certifications are mandatory. |
Compared with SLB9670 and NPCT750, the AT97SC3205-X3A12-20 uniquely delivers FIPS-140-2 Level 2 validation within a TPM 1.2 framework - making it the only option among the three qualified for environments requiring certified RNG and HMAC/AES/SHA/RSA operation, while maintaining full backward compatibility with existing TIS 1.3 infrastructure.
Availability
AT97SC3205-X3A12-20 is available at Aetrix Electronics and suitable for PC motherboard design, industrial edge gateway development, server platform integrity verification, and medical device data sealing requiring stable component supply and long-term lifecycle assurance.
Supply support for AT97SC3205-X3A12-20 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 AT97SC3205 family. Microchip is a global leader in microcontrollers, analog, and security ICs.
The AT97SC3205-X3A12-20 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver hardware-rooted security for PC, server, and embedded platforms requiring TCG-compliant boot integrity and cryptographic key protection.
FAQ
What is the operating temperature range supported by the AT97SC3205-X3A12-20?
The AT97SC3205-X3A12-20 is rated for industrial temperature operation from -40°C to +85°C. This specification applies to both the 28-pin thin TSSOP and 32-pad QFN package variants. The device automatically enters low-power idle mode when inactive, reducing thermal load without requiring host intervention - a key advantage for fanless edge computing platforms where ambient temperature fluctuates widely.
Does the AT97SC3205-X3A12-20 support TPM 2.0 functionality?
No, the AT97SC3205-X3A12-20 implements only TPM Specification Version 1.2 and the PC Client-Specific TPM Interface Specification (TIS) Version 1.3. It does not support TPM 2.0 features such as SHA-256, ECC algorithms, or hierarchical key structures. For TPM 2.0 compliance, designers should evaluate alternatives like the Infineon SLB9670 - the AT97SC3205-X3A12-20 remains optimal for legacy BIOS and UEFI systems requiring proven TPM 1.2 interoperability.
How is the AT97SC3205-X3A12-20 powered and what are its decoupling requirements?
The AT97SC3205-X3A12-20 operates from a single 3.3V ±10% supply applied to VCC pins. Per the datasheet, each VCC pin requires a dedicated 2200–4700pF ceramic bypass capacitor placed within 5mm of the pin and adjacent GND. A secondary 0.1μF capacitor must be located at the VCC node junction, within 10mm of the device. All capacitors must use X5R or X7R dielectrics - failure to meet these requirements risks RNG instability and TCG compliance failure.
What is the purpose of the PP/GPIO pin on the AT97SC3205-X3A12-20?
The PP/GPIO pin on the AT97SC3205-X3A12-20 serves as the Hardware Physical Presence indicator, required by TCG specifications to authorize privileged commands like TPM_Clear or TPM_OwnerSetDisable. It has an internal pull-down resistor and must be driven high (e.g., via pushbutton or GPIO) to assert physical presence. In default configuration, it operates as a GPIO input - enabling flexible reuse in non-PC applications where physical presence enforcement is unnecessary.
Can the AT97SC3205-X3A12-20 store user-defined data, and how much space is available?
Yes, the AT97SC3205-X3A12-20 provides 2066 bytes of nonvolatile (NV) storage accessible via authenticated TPM commands. This space is separate from internal EEPROM used for RSA keys and is intended for platform-specific data such as device certificates, policy flags, or encrypted configuration blobs. Access requires proper authorization hierarchy (e.g., owner or storage key authorization), ensuring confidentiality and integrity of stored content.
AT97SC3205-X3A12-20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Trusted Platform Module (TPM)
- Core Processor:
- AVR
- Program Memory Type:
- EEPROM
- Controller Series:
- -
- RAM Size:
- -
- Interface:
- SPI
- 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
AT97SC3205-X3A12-20 FAQ
1.How can I place an order for AT97SC3205-X3A12-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-X3A12-20 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 AT97SC3205-X3A12-20 reliable?
The price and inventory of AT97SC3205-X3A12-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-X3A12-20 is usually 5 days.
3.What payment methods are accepted for AT97SC3205-X3A12-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-X3A12-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-X3A12-20?
AT97SC3205-X3A12-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-X3A12-20 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 AT97SC3205-X3A12-20?
For technical support, including AT97SC3205-X3A12-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-X3A12-20 requirements.
6.How does Aetrix verify that AT97SC3205-X3A12-20 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-X3A12-20 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 AT97SC3205-X3A12-20 meets industry standards.
7.What is the process for return or replacement of AT97SC3205-X3A12-20?
All AT97SC3205-X3A12-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-X3A12-20, 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 AT97SC3205-X3A12-20 part is unused and in its original packaging.
Return procedure for AT97SC3205-X3A12-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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