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Microchip Technology AT97SC3205-X3A15-ABF
- Part No.:
- AT97SC3205-X3A15-ABF
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205-X3A15-ABF.pdf
- Description:
- CUSTSPEC FF COM SPI TPM 4.4MM TS
- Quantity:
- Payment:
- Shipping:
Inventory:2,271
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Product details
Overview
AT97SC3205-X3A15-ABF from 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 integrates an AVR RISC microprocessor and EEPROM for RSA key storage, operating at 3.3V with SPI interface up to 45MHz-designed for secure boot and platform integrity in PC client systems.
For engineers reviewing the AT97SC3205-X3A15-ABF datasheet, AT97SC3205-X3A15-ABF pinout, AT97SC3205-X3A15-ABF application, or AT97SC3205-X3A15-ABF equivalent, this page delivers verified package mapping (28-pin thin TSSOP), confirmed SPI-TIS 1.3 compliance, exact GPIO and tamper pin functions, and real-world design constraints including VCC decoupling requirements and PIRQ# active-low interrupt behavior.
Technical Context
The AT97SC3205-X3A15-ABF implements the full TCG TPM 1.2 stack in silicon, including dedicated hardware crypto accelerators for RSA key generation and SHA-1 hashing, coupled with a FIPS-140-2 validated pseudo-random number generator. Its internal SRAM and EEPROM manage dynamic key caching without host intervention via TPM_FlushSpecific and TPM_LoadKey2 commands.
It operates as a SPI slave device with strict timing requirements: SPI_CLK must stabilize before release of SPI_RST#, minimum reset pulse width is 2μs, and typical PC operation occurs between 24MHz–33MHz-not the absolute 45MHz maximum. Physical security circuitry includes tamper detection via XTamper (shared with TestBI) and hardware Physical Presence (PP/GPIO) support per TCG PC Client specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 Specification and PC Client-Specific TIS 1.3-enables BIOS-level secure boot and attestation in Windows/Linux PC platforms. |
| SPI Interface | Up to 45MHz clock rate; 24–33MHz typical PC range; supports MISO/MOSI/SPI_CS#/SPI_CLK/PIRQ#/SPI_RST# signals with active-low assertion logic. |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC, AES, SHA, and RSA-hardware-accelerated for key generation, signing, and hash operations without CPU overhead. |
| Nonvolatile Storage | 2066 bytes user-defined NV space + internal EEPROM for RSA keys-persistent across power cycles with wear-leveling managed by firmware. |
| Supply & Temp | 3.3V ±10% supply; industrial grade (-40°C to +85°C); requires 2200–4700pF decoupling capacitors within 5mm of each VCC pin. |
| 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 and lead-free. |
Pinout & Package
AT97SC3205-X3A15-ABF is supplied in a 28-pin thin TSSOP package (Atmel ordering code 28X1), measuring 4.40 mm × 9.70 mm with 0.65 mm pitch. The package includes 4 dedicated power/ground pins (2×VCC, 2×GND), 7 functional SPI interface pins, 4 GPIOs (including PP/GPIO and GPIO Express-00), 1 tamper input (TestBI/GPIO/XTamper), and 7 no-connect (NC) pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires local 2200–4700pF decoupling capacitor within 5mm of each pin to ensure stable operation over lifetime. |
| GND | Ground reference | System ground return path; two dedicated GND pins provided for noise isolation and current handling in high-integrity security paths. |
| MISO / MOSI / SPI_CLK / SPI_CS# / SPI_RST# / PIRQ# | SPI bus interface | Standard 4-wire SPI slave interface with active-low chip select and reset; PIRQ# provides asynchronous interrupt signaling to host controller. |
| PP/GPIO | Hardware Physical Presence indicator | Active-high GPIO used to assert physical presence during TPM initialization; internal pull-down; must be tied to system reset logic per TCG requirements. |
| GPIO Express-00 | Dedicated NV-indexed GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up; serves as XOR chain output during I/O test mode; left floating if unused. |
| TestBI/GPIO/XTamper | Multi-function terminal | Configurable as tamper event input (active-high), GPIO, or manufacturing test pin; not compatible with legacy BADD addressing. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates AVR CPU, crypto engines, RNG, EEPROM, and SPI interface on one die-eliminates external firmware loading and reduces BOM count. |
| FIPS-140-2 certification | Covers RNG, HMAC, AES, SHA, and RSA modules-validates cryptographic integrity for government and enterprise compliance (e.g., NIST SP 800-140). |
| Hardware Physical Presence (PP) | PP/GPIO pin enables BIOS-enforced user consent for sensitive operations like clearing ownership-required for TCG PC Client conformance. |
| 2066-byte user NV storage | Customer-configurable nonvolatile memory space accessible via TCG commands-supports secure storage of platform-specific credentials or policy data. |
| Tamper detection capability | XTamper function on TestBI pin allows external tamper switch integration-triggers secure erase and state lockdown upon intrusion detection. |
Applications
| Secure PC Boot | Enterprise Laptop Authentication |
|---|---|
|
Use Scenario: Verifying firmware integrity during POST before OS load in Windows 10/11 and Linux UEFI systems. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust executing SHA-1 measurements of BIOS, bootloader, and early kernel components. Use Value: Prevents unauthorized firmware modification and ensures only signed code executes-enabling BitLocker and Secure Boot enforcement. |
Use Scenario: Storing and validating user credentials during corporate domain login and disk encryption key release. IC Role / Device Role / Timing Role: Secure key vault and cryptographic accelerator for RSA decryption and HMAC verification of authentication tokens. Use Value: Enables hardware-bound credential binding so stolen credentials cannot be reused on other devices-meeting NIST 800-63B AAL3 requirements. |
| Industrial Control System Integrity | Medical Device Firmware Attestation |
|
Use Scenario: Remote attestation of PLC firmware versions and configuration hashes in factory automation networks. IC Role / Device Role / Timing Role: TPM-resident measurement log generator and signature engine for remote verification by central security server. Use Value: Detects unauthorized firmware updates or configuration drift in real time-supporting IEC 62443-3-3 SL2 compliance. |
Use Scenario: Ensuring FDA-required firmware authenticity and version traceability in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Immutable audit log keeper and cryptographic signing module for firmware update packages and runtime logs. Use Value: Provides verifiable, timestamped evidence of firmware provenance and integrity-fulfilling 21 CFR Part 11 electronic record requirements. |
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 | Larger 32-pin QFN-only footprint; supports LPC interface in addition to SPI; lacks GPIO Express-00 pin mapping. | Better suited for legacy x86 platforms with LPC bus; less flexible for custom GPIO-based platform control logic. | Choose SLB9665 TT 1.2 when LPC compatibility or higher-volume QFN assembly is required; AT97SC3205-X3A15-ABF preferred for SPI-only designs needing dedicated GPIO indexing. |
| Nuvoton NPCT750KB0GX | TPM 2.0 compliant; uses ARM Cortex-M0+ core; supports SHA-256 and ECC; no FIPS-140-2 Level 2 certification for RNG. | Required for new Windows 11 deployments and post-2023 OEM certifications; incompatible with legacy TPM 1.2 BIOS implementations. | Choose NPCT750KB0GX for greenfield TPM 2.0 designs; AT97SC3205-X3A15-ABF remains optimal for maintaining backward compatibility with existing TPM 1.2 infrastructure. |
Compared with Infineon SLB9665 TT 1.2 and Nuvoton NPCT750KB0GX, the AT97SC3205-X3A15-ABF uniquely balances TCG 1.2 compliance, FIPS-140-2 validation, compact TSSOP packaging, and GPIO Express-00 for NV-indexed control-making it ideal for cost-sensitive, space-constrained PC client and embedded OEM designs requiring field-proven security assurance.
Availability
AT97SC3205-X3A15-ABF is available at Aetrix Electronics and suitable for secure PC boot, enterprise laptop authentication, and industrial control system integrity applications requiring stable component supply and long-term lifecycle support.
Supply support for AT97SC3205-X3A15-ABF 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
Atmel Corporation, now part of Microchip Technology, is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and security ICs for embedded and industrial applications.
The AT97SC3205 product line delivers turnkey TPM 1.2 modules targeting PC client platforms and embedded systems requiring hardware-rooted trust, cryptographic acceleration, and tamper-aware secure storage.
FAQ
What is the primary compliance standard met by the AT97SC3205-X3A15-ABF?
The AT97SC3205-X3A15-ABF fully complies with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification and the TCG PC Client-Specific TPM Interface Specification (TIS) Version 1.3. This dual compliance ensures interoperability with industry-standard BIOS implementations and enables secure boot, remote attestation, and cryptographic key protection in PC and embedded platforms where TPM 1.2 is mandated.
Does the AT97SC3205-X3A15-ABF support both commercial and industrial temperature ranges?
Yes, the AT97SC3205-X3A15-ABF is qualified for both commercial (0°C to +70°C) and industrial (-40°C to +85°C) operating temperatures. This dual-range qualification makes the AT97SC3205-X3A15-ABF suitable for deployment in desktop PCs, laptops, and ruggedized industrial controllers where ambient thermal conditions exceed standard commercial limits.
What is the function of the PP/GPIO pin on the AT97SC3205-X3A15-ABF?
The PP/GPIO pin on the AT97SC3205-X3A15-ABF serves as the Hardware Physical Presence indicator-active-high signal used to assert user consent for privileged TPM operations such as clearing ownership or disabling the module. Per TCG PC Client specification, this pin must be tied to system reset logic and is internally pulled down, requiring explicit host-side activation to enable physical presence functionality in the AT97SC3205-X3A15-ABF.
Can the AT97SC3205-X3A15-ABF be used in TPM 2.0–compliant systems?
No, the AT97SC3205-X3A15-ABF implements only TPM 1.2 and is not compatible with TPM 2.0 protocols, algorithms (e.g., SHA-256, ECC), or command sets. Systems requiring TPM 2.0-for example, Windows 11 certification or newer UEFI firmware-must use a dedicated TPM 2.0 device such as the Nuvoton NPCT750KB0GX; the AT97SC3205-X3A15-ABF remains appropriate for legacy TPM 1.2 deployments.
What are the decoupling capacitor requirements for the VCC pins of the AT97SC3205-X3A15-ABF?
The AT97SC3205-X3A15-ABF requires individual 2200–4700pF high-quality ceramic decoupling capacitors placed within 5mm of each VCC pin, connected directly to the adjacent GND pin. Additionally, a 0.1μF X5R/X7R capacitor must be placed at the VCC node junction, located within 10mm of the device. These values are mandatory to suppress switching noise and ensure reliable operation of the FIPS-certified RNG and crypto engines in the AT97SC3205-X3A15-ABF.
AT97SC3205-X3A15-ABF 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-X3A15-ABF FAQ
1.How can I place an order for AT97SC3205-X3A15-ABF through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-X3A15-ABF 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-X3A15-ABF reliable?
The price and inventory of AT97SC3205-X3A15-ABF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-X3A15-ABF is usually 5 days.
3.What payment methods are accepted for AT97SC3205-X3A15-ABF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-X3A15-ABF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-X3A15-ABF?
AT97SC3205-X3A15-ABF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-X3A15-ABF 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-X3A15-ABF?
For technical support, including AT97SC3205-X3A15-ABF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-X3A15-ABF requirements.
6.How does Aetrix verify that AT97SC3205-X3A15-ABF is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-X3A15-ABF 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-X3A15-ABF meets industry standards.
7.What is the process for return or replacement of AT97SC3205-X3A15-ABF?
All AT97SC3205-X3A15-ABF units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-X3A15-ABF, 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-X3A15-ABF part is unused and in its original packaging.
Return procedure for AT97SC3205-X3A15-ABF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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