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Microchip Technology AT97SC3205-U3A12-20
- Part No.:
- AT97SC3205-U3A12-20
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205-U3A12-20.pdf
- Description:
- TPM SPI C8 REVF IND 4.4MM TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,036
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Product details
Overview
AT97SC3205-U3A12-20 from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based cryptographic functions including FIPS-140-2 certified RNG, AES, SHA, HMAC, and RSA engines. It integrates an AVR RISC microprocessor, 2066-byte NV user storage, and SPI interface up to 45 MHz for PC client and embedded platform secure boot, key management, and platform integrity verification.
For engineers reviewing the AT97SC3205-U3A12-20 datasheet, AT97SC3205-U3A12-20 pinout, AT97SC3205-U3A12-20 application, or AT97SC3205-U3A12-20 equivalent, this page delivers verified package mapping (32-pad QFN), confirmed SPI-TIS 1.3 compliance, FIPS-140-2 module certification scope, GPIO configuration details, and OEM-ready firmware integration support - all critical for BIOS/UEFI integration and TPM-enabled system validation.
Technical Context
The AT97SC3205-U3A12-20 implements the TCG PC Client-Specific TPM Interface Specification (TIS) v1.3 over SPI, with active-low PIRQ# interrupt signaling and SPI_CS#/SPI_RST# control logic synchronized to system reset. Its internal architecture combines an 8-bit AVR CPU, dedicated crypto engine, and EEPROM-resident RSA key storage managed via dynamic cache without host intervention.
Security enforcement includes physical tamper detection via XTamper pin, hardware physical presence (PP/GPIO) assertion, and secure firmware execution validated under FIPS-140-2 for RNG, HMAC, AES, SHA, and RSA operations. The device enters low-power mode automatically during idle periods without external control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification and PC Client-Specific TIS v1.3 - ensures interoperability with Windows BitLocker, Linux tpm-tools, and UEFI Secure Boot stacks. |
| SPI Interface | Up to 45 MHz clock rate (typical PC range: 24–33 MHz) with MISO/MOSI/CLK/CS#/RST# signals - enables high-throughput command/response cycles in BIOS initialization sequences. |
| FIPS Certification | FIPS-140-2 Level 2 certified module covering RNG, HMAC, AES, SHA, and RSA engines - satisfies federal and enterprise security policy requirements for cryptographic validation. |
| Non-Volatile Storage | 2066 bytes of user-defined NV space - supports persistent storage of platform-specific keys, certificates, or attestation logs without external memory dependency. |
| Supply Voltage | 3.3 V ±10% with strict decoupling requirements (2200–4700 pF near each VCC pin, <5 mm to adjacent GND) - mandates precise PCB layout for stable operation across temperature ranges. |
| Operating Temperature | Industrial range: −40°C to +85°C - qualified for deployment in ruggedized industrial PCs, network appliances, and edge servers requiring extended thermal reliability. |
| Package | 32-pad QFN (4.0 × 4.0 × 0.9 mm, 0.4 mm pitch) with exposed thermal pad tied to GND - enables compact, thermally efficient placement on dense motherboard layouts. |
Pinout & Package
AT97SC3205-U3A12-20 uses the 32-pad Very Thin QFN (VQFN) package (Atmel ordering code 32M3), measuring 4.0 × 4.0 × 0.9 mm with 0.4 mm pitch and an internally grounded thermal pad. Pin assignments are defined per Atmel-8884AS-TPM-AT97SC3205-Datasheet-Summary_022014, Table 3-1 and Figure 1-1 (QFN variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires localized 2200–4700 pF decoupling within 5 mm of each VCC pin and adjacent GND. |
| GND | Ground reference | System ground return; substrate center pad is internally connected to GND and may be left floating or tied externally. |
| MISO | SPI data output | Master-In-Slave-Out signal carrying TPM response data; driven only when SPI_CS# is asserted low. |
| MOSI | SPI data input | Master-Out-Slave-In signal delivering commands and parameters; sampled on SPI_CLK rising edge. |
| SPI_CLK | SPI clock input | Asynchronous clock up to 45 MHz; must be held high during idle to reduce power consumption. |
| SPI_CS# | SPI chip select | Active-low enable signal; initiates command frame on falling edge and terminates on rising edge. |
| SPI_RST# | SPI reset input | Active-low hardware reset; minimum 2 μs pulse width required; must be tied to system reset for TCG compliance. |
| PIRQ# | SPI interrupt output | Active-low open-drain interrupt indicating command completion or error; requires external pull-up resistor if used. |
| PP/GPIO | Physical presence indicator | Hardware Physical Presence input (active-high); defaults to GPIO input with internal pull-down; must be asserted for privileged TPM operations. |
| TestBI/GPIO/XTamper | Multi-function terminal | Configurable as GPIO, tamper event input (active-high), or manufacturing test pin; unused state requires tie to GND via 4.7 kΩ resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated AVR RISC CPU | On-chip 8-bit processor executes TPM firmware independently, eliminating need for external host controller coordination during cryptographic operations. |
| FIPS-140-2 Certified Crypto Engine | Validated RNG, AES, SHA, HMAC, and RSA modules ensure cryptographic primitives meet federal validation standards for government and regulated industry deployments. |
| Dynamic Key Cache Management | Automated internal EEPROM key storage and eviction eliminates host software overhead for RSA key loading/unloading (e.g., no explicit TPM_LoadKey2 required). |
| Hardware Physical Presence Support | Dedicated PP/GPIO pin enforces user-authorized execution of sensitive commands (e.g., TPM_Clear, TPM_OwnerSetDisable), satisfying TCG PC Client requirements. |
| XTamper Detection Capability | External tamper sensing via TestBI/GPIO/XTamper pin triggers immediate key zeroization and status flag assertion, meeting physical security assurance levels. |
Applications
| Secure Boot Validation | Enterprise Disk Encryption |
|---|---|
Use Scenario: Verifying firmware integrity during POST before loading UEFI or legacy BIOS. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust executing SHA-1/SHA-256 measurements of boot components and storing PCR values in protected registers. Use Value: Prevents unauthorized firmware modification by binding decryption keys to measured boot state, enforced via TPM_Quote and TPM_Seal commands. | Use Scenario: Enabling BitLocker on Windows laptops or LUKS on Linux workstations with hardware-backed key protection. IC Role / Device Role / Timing Role: Securely stores and releases volume encryption keys only after successful platform authentication and PCR validation. Use Value: Ensures full-disk encryption keys never reside in volatile RAM or unencrypted storage, mitigating cold-boot and hibernation file attacks. |
| Server Platform Attestation | Industrial Control System Integrity |
Use Scenario: Remote attestation of bare-metal server health in cloud infrastructure or data center provisioning workflows. IC Role / Device Role / Timing Role: Generates signed quotes of PCR values using embedded RSA private key, verifiable by remote management consoles. Use Value: Enables zero-trust admission control by cryptographically proving runtime configuration matches expected secure baseline. | Use Scenario: Protecting firmware updates and configuration changes in programmable logic controllers (PLCs) and HMIs deployed in factory automation. IC Role / Device Role / Timing Role: Validates digital signatures on firmware images using stored public keys and performs secure boot before executing new code. Use Value: Blocks malicious firmware injection and ensures only authorized, signed updates execute - critical for IEC 62443 compliance. |
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 SLB9665 TT 1.2 | Same TCG 1.2/TIS 1.3 compliance; uses ARM-based core instead of AVR; supports LPC interface in addition to SPI. | LPC support enables legacy x86 platform integration where SPI is unavailable; slightly larger 6 × 6 mm QFN package. | Select when LPC interface is required or when migrating from Infineon-based designs with identical firmware abstraction layers. |
| Nuvoton NPCT650KBAX | TCG 1.2 compliant; integrates 32-bit ARM Cortex-M0+; offers 2.5–3.6 V supply range vs. AT97SC3205-U3A12-20's fixed 3.3 V. | Broad voltage tolerance simplifies power design in multi-rail systems; lacks FIPS-140-2 certification for full module (only individual algorithms certified). | Select for flexible supply design or when FIPS module-level certification is not mandated, but algorithm-level validation suffices. |
Compared with Infineon SLB9665 TT 1.2 and Nuvoton NPCT650KBAX, the AT97SC3205-U3A12-20 provides FIPS-140-2 Level 2 module certification out-of-box, deterministic AVR-based timing for predictable command latency, and optimized 4.0 × 4.0 mm QFN footprint - making it ideal for space-constrained, federally compliant PC and industrial platforms requiring turnkey TPM integration.
Availability
AT97SC3205-U3A12-20 is available at Aetrix Electronics and suitable for secure boot validation, enterprise disk encryption, and server platform attestation requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and OEM programs.
Supply support for AT97SC3205-U3A12-20 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 product support, documentation, and manufacturing continuity for the AT97SC3205 series.
The AT97SC3205-U3A12-20 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver TCG-compliant, FIPS-validated hardware security for PC client, server, and industrial embedded platforms requiring secure boot, remote attestation, and encrypted key storage.
FAQ
What is the primary compliance standard met by the AT97SC3205-U3A12-20?
The AT97SC3205-U3A12-20 is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification and the PC Client-Specific TPM Interface Specification (TIS) Version 1.3. It also holds FIPS-140-2 Level 2 certification for its integrated RNG, HMAC, AES, SHA, and RSA cryptographic modules - confirming validation for use in U.S. federal and regulated enterprise environments. This dual compliance makes the AT97SC3205-U3A12-20 suitable for BitLocker, UEFI Secure Boot, and remote attestation implementations.
Does the AT97SC3205-U3A12-20 support both commercial and industrial temperature ranges?
Yes, the AT97SC3205-U3A12-20 is qualified for the industrial temperature range of −40°C to +85°C, as specified in the Atmel-8884AS-TPM-AT97SC3205-Datasheet-Summary_022014. While the base AT97SC3205 family includes commercial-grade variants (0°C to 70°C), the -U3A12-20 suffix explicitly denotes the industrial-grade version. This qualification ensures reliable operation in demanding environments such as network infrastructure equipment, industrial PCs, and edge computing devices.
How is the AT97SC3205-U3A12-20 powered and what are its decoupling requirements?
The AT97SC3205-U3A12-20 operates exclusively from a 3.3 V ±10% supply applied to its VCC pins. Per the datasheet, effective decoupling is critical: a 2200–4700 pF capacitor must be placed within 5 mm of each VCC pin and its adjacent GND pin, and a 0.1 µF capacitor must be located at the VCC node junction, within 10 mm of the device. All capacitors must use X5R or X7R dielectrics. Failure to meet these requirements risks intermittent operation or failure to meet TCG timing specifications during SPI transactions.
What interfaces does the AT97SC3205-U3A12-20 support and how is it connected to the host system?
The AT97SC3205-U3A12-20 supports only the Serial Peripheral Interface (SPI) as defined in TCG TIS v1.3. Connection requires seven signals: VCC, GND, MISO, MOSI, SPI_CLK, SPI_CS#, and SPI_RST#. Optional connections include PIRQ# (for interrupt-driven operation), PP/GPIO (for hardware physical presence), and TestBI/GPIO/XTamper (for tamper detection or GPIO extension). No LPC, I²C, or UART interfaces are supported - the AT97SC3205-U3A12-20 is SPI-only by design.
Is firmware preloaded on the AT97SC3205-U3A12-20 and can it be updated?
Yes, the AT97SC3205-U3A12-20 ships with fully integrated, factory-programmed TPM firmware compliant with TCG 1.2 and TIS 1.3. Atmel provided BIOS drivers and manufacturing support tools for OEM initialization, but field firmware updates are not supported - the device is a turnkey solution with immutable firmware. All cryptographic operations, command parsing, and state management are handled autonomously by the on-chip AVR processor and crypto engine; no host-side firmware loading or patching is possible or required for standard TPM 1.2 operation.
AT97SC3205-U3A12-20 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
AT97SC3205-U3A12-20 FAQ
1.How can I place an order for AT97SC3205-U3A12-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-U3A12-20 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-U3A12-20 reliable?
The price and inventory of AT97SC3205-U3A12-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-U3A12-20 is usually 5 days.
3.What payment methods are accepted for AT97SC3205-U3A12-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-U3A12-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-U3A12-20?
AT97SC3205-U3A12-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-U3A12-20 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-U3A12-20?
For technical support, including AT97SC3205-U3A12-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-U3A12-20 requirements.
6.How does Aetrix verify that AT97SC3205-U3A12-20 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-U3A12-20 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-U3A12-20 meets industry standards.
7.What is the process for return or replacement of AT97SC3205-U3A12-20?
All AT97SC3205-U3A12-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-U3A12-20, 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-U3A12-20 part is unused and in its original packaging.
Return procedure for AT97SC3205-U3A12-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205-U3A12-20 Tags
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CYPD3175-24LQXQ
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SLB9672VU20FW1523XTMA1
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SLB9670VQ20FW785XTMA1
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SLB9673XU20FW2613XTMA1
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AT97SC3204-U2A1A-20
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9672AU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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