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Microchip Technology AT97SC3205-G3M4520B
- Part No.:
- AT97SC3205-G3M4520B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205-G3M4520B.pdf
- Description:
- PROD FF COM SPI TPM 4X4 32VQFN S
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205-G3M4520B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based cryptographic services including FIPS-140-2 certified RNG, AES, SHA, HMAC, and RSA engines; operates at 3.3V with SPI interface up to 45MHz; used in PC motherboard firmware trust anchors and embedded secure boot systems.
For engineers reviewing the AT97SC3205-G3M4520B datasheet, AT97SC3205-G3M4520B pinout, AT97SC3205-G3M4520B application, or AT97SC3205-G3M4520B equivalent, this page delivers verified package mapping (32-pin QFN), confirmed SPI-TIS 1.3 compliance, FIPS-140-2 module certification scope, GPIO/PP functionality, and NV storage capacity - all critical for BIOS integration, secure key provisioning, and tamper-aware system design.
Technical Context
The AT97SC3205-G3M4520B integrates an AVR 8-bit RISC CPU with dedicated crypto hardware acceleration, enabling full TCG TPM 1.2 command execution without host CPU offload. Its internal EEPROM stores RSA keys and supports 2066 bytes of user-defined NV data.
It implements the TCG PC Client-Specific TPM Interface Specification (TIS) v1.3 over SPI, with active-low PIRQ# interrupt signaling and SPI_RST# reset synchronization required for TCG compliance. Physical security circuitry includes tamper detection via XTamper pin and secure chip layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification and PC Client-Specific TIS v1.3 - ensures interoperability with standard BIOS/UEFI and OS-level TPM stacks. |
| FIPS Certification | FIPS-140-2 Level 2 certified module covering RNG, HMAC, AES, SHA, and RSA engines - satisfies federal and enterprise security validation requirements. |
| SPI Interface | Up to 45MHz clock rate (typical PC operation: 24–33MHz); supports TIS-compliant command framing and status polling - enables low-latency host communication. |
| Supply Voltage | 3.3V ±5% - requires tight decoupling per spec: 2200–4700pF caps within 5mm of each VCC pin and 0.1μF at VCC node - critical for stable crypto operation. |
| Temperature Range | Industrial grade: −40°C to +85°C - qualified for extended-temperature embedded platforms beyond commercial PC use cases. |
| NV Storage | 2066 bytes user-defined non-volatile storage - usable for platform-specific credentials, certificates, or policy data without consuming main system flash. |
| Package | 32-pad QFN (32M3), 4.0 × 4.0 × 0.9 mm, 0.4 mm pitch - surface-mount compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
AT97SC3205-G3M4520B uses the 32-pad Very Thin QFN (32M3) package: 4.0 × 4.0 × 0.9 mm body, 0.4 mm lead pitch, exposed thermal pad tied internally to GND. Pin 1 marked by corner cutout; substrate center pad may be left floating or connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V primary power rail; requires localized decoupling (2200–4700pF) within 5mm of each pin to prevent crypto engine instability. |
| GND | Ground reference | System ground return; multiple GND pins provide low-impedance paths for digital and analog sections - essential for RNG noise immunity. |
| MISO / MOSI / SPI_CLK / SPI_CS# / SPI_RST# | SPI interface signals | Full-duplex SPI slave interface compliant with TIS v1.3; SPI_RST# must be tied to system reset for TCG compliance and proper TPM_Init sequencing. |
| PIRQ# | Interrupt output | Active-low interrupt signal indicating pending TPM response or event; must be pulled to GND if unused to avoid spurious asserts. |
| PP/GPIO | Physical presence indicator | Hardware-controlled active-high signal asserting physical presence for admin-mode commands; internal pull-down allows safe floating when unused. |
| TestBI/GPIO/XTamper | Multi-function terminal | Configurable as GPIO, tamper detect input (active-high), or test pin; requires tie-to-GND via 4.7kΩ if unused to prevent unintended tamper assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | On-die RSA key generation and signing acceleration - eliminates software-based key handling risks and reduces host CPU load during secure boot. |
| FIPS-140-2 Certified RNG | Dedicated entropy source meeting NIST SP 800-90A requirements - provides cryptographically secure random numbers for key derivation and protocol nonces. |
| Internal EEPROM Key Storage | Protected non-volatile memory storing RSA private keys - prevents extraction via side-channel or firmware dump attacks. |
| GPIO Express-00 | Pre-mapped NV index (TPM_NV_INDEX_GPIO_00) with internal pull-up - enables simple, standardized platform configuration without custom firmware. |
| Tamper Detection Support | XTamper pin enables external tamper switch or sensor integration - triggers secure erase and state lockdown upon physical intrusion detection. |
Applications
| PC Motherboard Secure Boot | Industrial Embedded Authentication |
|---|---|
|
Use Scenario: Enabling UEFI Secure Boot and measured boot on x86 desktop/laptop motherboards. IC Role / Device Role / Timing Role: Root-of-trust anchor providing cryptographic verification of bootloader and OS kernel integrity before execution. Use Value: Prevents unauthorized firmware modification and ransomware persistence by binding boot measurements to hardware-protected keys stored in AT97SC3205-G3M4520B EEPROM. |
Use Scenario: Authenticating field-upgradable firmware in industrial gateways and PLC controllers. IC Role / Device Role / Timing Role: Secure key vault and signature verifier ensuring only signed firmware images execute on remote devices. Use Value: Enables zero-touch remote updates with cryptographic assurance - AT97SC3205-G3M4520B's FIPS-certified RSA engine validates signatures without exposing private keys. |
| Server Platform Integrity Monitoring | Medical Device Data Provenance |
|
Use Scenario: Measuring and attesting BIOS, BMC, and hypervisor states in rack-mounted servers. IC Role / Device Role / Timing Role: Remote attestation endpoint generating signed quotes of platform configuration registers (PCRs). Use Value: Allows cloud orchestration tools to verify server trustworthiness before workload assignment - AT97SC3205-G3M4520B's TIS v1.3 interface ensures deterministic latency for quote generation. |
Use Scenario: Securing patient data logs and device calibration records in FDA-cleared diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-evident timestamping and digital signing of audit trails using internal RTC-synchronized signatures. Use Value: Meets 21 CFR Part 11 requirements for electronic records - AT97SC3205-G3M4520B's XTamper pin detects enclosure breaches and triggers automatic log sealing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM security module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9670 | TPM 2.0 compliant; supports SHA-256, ECC, and PCR extensions; larger 64-pin TFBGA package. | Required for new Windows 11 and modern Linux distributions mandating TPM 2.0; not backward-compatible with legacy TPM 1.2 BIOS stacks. | Select SLB9670 when upgrading to TPM 2.0 mandates or requiring ECC-based key agility; AT97SC3205-G3M4520B remains optimal for TPM 1.2–only legacy platforms. |
| Nuvoton NPCT750 | TPM 1.2 compliant; integrated LPC interface (no SPI); 32-pin QFN same footprint but different pinout and voltage tolerance (1.8V I/O). | Designed for LPC bus attachment in traditional PC chipsets; incompatible with SPI-only host controllers without bridge logic. | Choose NPCT750 only for LPC-based designs; AT97SC3205-G3M4520B is the correct selection for SPI-native embedded hosts requiring identical 32M3 mechanical fit. |
Compared with SLB9670 and NPCT750, AT97SC3205-G3M4520B uniquely delivers SPI-native TPM 1.2 compliance in a compact 32M3 QFN with FIPS-140-2 certification scope covering RNG, AES, SHA, HMAC, and RSA - making it the validated choice for cost-sensitive, space-constrained industrial and legacy PC designs where TPM 2.0 migration is not required.
Availability
AT97SC3205-G3M4520B is available at Aetrix Electronics and suitable for PC motherboard manufacturing, industrial gateway authentication, and medical device data integrity applications requiring stable component supply across long product lifecycles.
Supply support for AT97SC3205-G3M4520B 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 series.
The AT97SC3205 product line was designed as a turnkey TPM 1.2 solution for PC and embedded OEMs needing FIPS-certified hardware root-of-trust with minimal firmware integration effort.
FAQ
What is the operating temperature range for AT97SC3205-G3M4520B?
The AT97SC3205-G3M4520B is rated for industrial temperature operation from −40°C to +85°C. This extended range supports deployment in harsh environments such as factory automation controllers and outdoor network infrastructure where commercial-grade components would fail. The specification is validated per Atmel's qualification testing and documented in the ordering information section of the datasheet summary.
Does AT97SC3205-G3M4520B support TPM 2.0?
No, AT97SC3205-G3M4520B implements only TPM 1.2 per the Trusted Computing Group specification and PC Client-Specific TIS v1.3. It does not support TPM 2.0 features such as SHA-256 hashing, ECC cryptography, or hierarchical key structures. For TPM 2.0 compliance, designers must select alternatives like the Infineon SLB9670.
What is the purpose of the TestBI/GPIO/XTamper pin on AT97SC3205-G3M4520B?
The TestBI/GPIO/XTamper pin on AT97SC3205-G3M4520B serves three modes: manufacturing test input (disabled post-production), general-purpose GPIO, or active-high external tamper detection input. When configured as XTamper, it triggers immediate secure erase and state lockdown upon voltage transition - a critical feature for AT97SC3205-G3M4520B deployments in regulated medical or financial equipment.
How much non-volatile user storage does AT97SC3205-G3M4520B provide?
AT97SC3205-G3M4520B provides 2066 bytes of user-defined non-volatile storage accessible via TCG-defined NV commands. This space is separate from internal key storage and can hold platform-specific credentials, calibration data, or audit logs - all protected by access authorization policies enforced by the AT97SC3205-G3M4520B firmware.
Is AT97SC3205-G3M4520B RoHS compliant and lead-free?
Yes, AT97SC3205-G3M4520B is RoHS compliant and manufactured with lead-free packaging per Atmel's ordering code documentation. The 32M3 QFN package uses matte tin finish on terminals and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements - confirming suitability for standard reflow soldering processes without special handling.
AT97SC3205-G3M4520B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- 32-VQFN (4x4)
AT97SC3205-G3M4520B FAQ
1.How can I place an order for AT97SC3205-G3M4520B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205-G3M4520B 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-G3M4520B reliable?
The price and inventory of AT97SC3205-G3M4520B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205-G3M4520B is usually 5 days.
3.What payment methods are accepted for AT97SC3205-G3M4520B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205-G3M4520B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205-G3M4520B?
AT97SC3205-G3M4520B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205-G3M4520B 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-G3M4520B?
For technical support, including AT97SC3205-G3M4520B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205-G3M4520B requirements.
6.How does Aetrix verify that AT97SC3205-G3M4520B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205-G3M4520B 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-G3M4520B meets industry standards.
7.What is the process for return or replacement of AT97SC3205-G3M4520B?
All AT97SC3205-G3M4520B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205-G3M4520B, 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-G3M4520B part is unused and in its original packaging.
Return procedure for AT97SC3205-G3M4520B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205-G3M4520B Tags
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CYPD3175-24LQXQ
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SLB9672VU20FW1523XTMA1
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SLB9670VQ20FW785XTMA1
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AT97SC3204-U2A1A-20
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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