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Microchip Technology AT97SC3205T-H3M4400B
- Part No.:
- AT97SC3205T-H3M4400B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4400B.pdf
- Description:
- PROD STD IND I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,338
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Product details
Overview
AT97SC3205T-H3M4400B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating an AVR® RISC microprocessor, hardware RSA crypto engine, FIPS-140-2 certified RNG/AES/SHA/HMAC engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400 kHz and targets secure boot, platform authentication, and key management in embedded computing systems.
For engineers reviewing the AT97SC3205T-H3M4400B datasheet, AT97SC3205T-H3M4400B pinout, AT97SC3205T-H3M4400B application, or AT97SC3205T-H3M4400B equivalent, this page delivers verified electrical specs, validated pin functions, confirmed package mapping (32-pad QFN), real-world use cases, and two technically documented alternative TPMs for design continuity.
Technical Context
The AT97SC3205T-H3M4400B implements the full TCG TPM 1.2 specification using an on-die AVR 8-bit RISC CPU, dedicated asymmetric crypto accelerator, and internal EEPROM for RSA key storage. Its I²C interface supports both Standard (100 kHz) and Fast Mode (400 kHz) timing with configurable pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK).
Security architecture includes physical tamper detection via XTAMPER input, hardware Physical Presence (PP/GPIO) signaling, low-power deep-sleep recovery via TWI_Wakeup# pins, and FIPS-140-2 certification covering RNG, HMAC, AES, SHA, and RSA engines - all integrated into a single die with no external crypto co-processor required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables standardized platform integrity attestation and sealed storage. |
| I²C Interface Speed | Up to 400 kHz Fast Mode - supports high-throughput command/response cycles without requiring SPI or UART redesign. |
| Supply Voltage | 3.3V ±5% - compatible with standard embedded logic rails; requires local 2200–4700 pF decoupling per VCC pin. |
| NV User Storage | 2066 bytes of non-volatile EEPROM space - sufficient for custom certificates, policy data, or firmware hashes. |
| Crypto Engines | FIPS-140-2 certified RNG, AES-128, SHA-1, HMAC-SHA1, and RSA-2048 - eliminates need for external cryptographic libraries or software-only implementations. |
| Operating Temp | -40°C to +85°C industrial range - qualified for deployment in network infrastructure, industrial controllers, and edge gateways. |
| Package Type | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch) - surface-mount compatible with automated assembly; thermal pad tied to GND. |
Pinout & Package
AT97SC3205T-H3M4400B uses a 32-pad Very Thin QFN (VQFN) package (32M3 footprint), 4.0 mm × 4.0 mm body, 0.40 mm pitch, with exposed thermal pad internally connected to GND. Pinout validated per Atmel-8883AS datasheet summary.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires dedicated 2200–4700 pF bypass capacitor within 5 mm of each VCC pin. |
| GND | Ground reference | System ground return; thermal pad must be soldered to PCB GND plane for thermal and EMI performance. |
| SM_DAT / SM_CLK | I²C bidirectional data/clock | Standard I²C bus interface; SM_DAT pull-up = 800 Ω, SM_CLK pull-up = 1.5 kΩ for reliable 400 kHz operation. |
| PP/GPIO | Hardware Physical Presence indicator | Active-high signal indicating user-authorized TPM operations; internal pull-down ensures safe default state. |
| TestBI/GPIO/XTAMPER | XTAMPER input or GPIO | Dual-function pin supporting tamper event detection (XTAMPER) or general-purpose I/O; tie to GND if unused. |
| TWI_Wakeup# | Low-power sleep recovery | Two-pin active-low wake sequence required to exit TPM_DeepSleep mode - prevents spurious wake events. |
| PIRQ# | Interrupt request output | Open-drain interrupt signal asserted by TPM to host processor upon completion of long-running commands. |
| GPIO-Express-00 | Pre-mapped NV index GPIO | Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up allows floating when unused; used for persistent GPIO state storage. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates CPU, crypto engines, RNG, EEPROM, and I²C interface in one die - reduces BOM count and board area vs. multi-chip alternatives. |
| FIPS-140-2 certified crypto suite | Certified RNG, AES, SHA, HMAC, and RSA engines eliminate need for external validation testing in regulated environments. |
| Hardware Physical Presence support | Dedicated PP/GPIO pin enforces user consent for sensitive operations (e.g., clearing ownership), satisfying TCG policy enforcement requirements. |
| XTAMPER tamper detection | TestBI/GPIO/XTAMPER pin provides hardware-level tamper sensing - triggers secure erase on unauthorized enclosure access. |
| Deep-sleep power management | TPM_DeepSleep command reduces current draw significantly; dual TWI_Wakeup# pin requirement prevents accidental wake-up in noisy environments. |
Applications
| Server Platform Integrity | Industrial Control Authentication |
|---|---|
Use Scenario: Verifying firmware integrity during BIOS/UEFI boot and measuring system configuration into PCR registers. IC Role / Device Role / Timing Role: Root-of-trust anchor performing SHA-1 hashing, RSA signature verification, and PCR extension before OS load. Use Value: Prevents unauthorized firmware modification and establishes chain-of-trust from power-on reset through hypervisor initialization. | Use Scenario: Authenticating firmware updates and validating PLC configuration files in factory automation systems. IC Role / Device Role / Timing Role: Secure key storage and HMAC-based update signature verification prior to flash programming. Use Value: Ensures only signed, vendor-authorized firmware executes - mitigates ransomware and sabotage attacks on critical infrastructure. |
| Network Equipment Identity | Edge Gateway Secure Boot |
Use Scenario: Providing unique device identity and TLS certificate binding for enterprise switches and firewalls. IC Role / Device Role / Timing Role: Storing device-specific RSA key pair and enabling hardware-backed TLS handshake acceleration. Use Value: Enables zero-touch provisioning and mutual TLS authentication without exposing private keys to host memory. | Use Scenario: Enforcing signed bootloader execution and measured boot in IoT edge gateways with Linux-based OS. IC Role / Device Role / Timing Role: TPM 1.2-compliant platform configuration register (PCR) extension and sealed storage of decryption keys. Use Value: Guarantees runtime integrity and protects sensitive credentials used for cloud API authentication and OTA update decryption. |
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 banks beyond TPM 1.2 scope; 3.3V I²C interface; 32-pin QFN package. | Required for new designs targeting Windows 11 or modern Linux distributions mandating TPM 2.0; not backward-compatible with legacy TPM 1.2 drivers. | Select SLB9670 when upgrading to TPM 2.0 compliance is mandatory; verify host stack and firmware support before migration. |
| Nuvoton NPCT750 | TPM 2.0 compliant; integrates ARM Cortex-M0+ core; supports both I²C and SPI interfaces; 32-pin QFN; FIPS 140-2 Level 3 certified. | Offers SPI interface option and higher crypto throughput; suitable for resource-constrained hosts lacking robust I²C stacks or requiring faster command processing. | Choose NPCT750 where SPI interface availability, ARM-based firmware extensibility, or Level 3 physical security assurance is required. |
Compared with AT97SC3205T-H3M4400B, SLB9670 and NPCT750 provide TPM 2.0 functionality essential for modern OS compatibility but require driver and firmware updates; AT97SC3205T-H3M4400B remains optimal for maintaining legacy TPM 1.2 deployments with minimal integration effort.
Availability
AT97SC3205T-H3M4400B is available at Aetrix Electronics and suitable for server platform integrity, industrial control authentication, and network equipment identity applications requiring stable component supply across extended product lifecycles.
Supply support for AT97SC3205T-H3M4400B 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 ICs including the AT97SC3205T series. Microchip is a global semiconductor company specializing in microcontrollers, analog, and security solutions.
The AT97SC3205T belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded platforms needing hardware-rooted trust without external crypto components.
FAQ
What is the primary function of the AT97SC3205T-H3M4400B in a system?
The AT97SC3205T-H3M4400B serves as a hardware-rooted Trusted Platform Module (TPM) 1.2, providing cryptographic key generation, secure storage, platform integrity measurement, and attestation services. It acts as the root of trust for secure boot, firmware validation, and hardware-based identity binding - all implemented within a single chip containing an AVR CPU, crypto engines, and EEPROM. The AT97SC3205T-H3M4400B enables tamper-resistant, standards-compliant security without requiring external cryptographic accelerators or software-only implementations.
Does the AT97SC3205T-H3M4400B support TPM 2.0?
No, the AT97SC3205T-H3M4400B implements only the Trusted Computing Group (TCG) TPM 1.2 specification. It does not support TPM 2.0 features such as SHA-256, ECC algorithms, hierarchical key structures, or extended PCR banks. Systems requiring TPM 2.0 compliance - for example, Windows 11 or newer Linux distributions - must use a different part such as the Infineon SLB9670 or Nuvoton NPCT750. The AT97SC3205T-H3M4400B remains fully functional and supported for legacy TPM 1.2 deployments.
What are the I²C interface requirements for reliable 400 kHz operation with the AT97SC3205T-H3M4400B?
For stable 400 kHz Fast Mode I²C communication, the AT97SC3205T-H3M4400B requires a 800 Ω pull-up resistor on SM_DAT and a 1.5 kΩ pull-up on SM_CLK, as validated in Atmel's datasheet summary. Clock duty cycle should approach 50% to maximize noise immunity. Additionally, VCC must be well-decoupled with 2200–4700 pF capacitors placed within 5 mm of each VCC pin and a 0.1 µF bulk capacitor near the device. These conditions ensure deterministic timing and prevent communication timeouts or CRC errors during TPM command sequences.
How is physical presence enforced on the AT97SC3205T-H3M4400B?
Physical Presence is enforced via the PP/GPIO pin, which is an active-high input with an internal pull-down resistor. When asserted high by the system (e.g., via front-panel button or firmware-controlled GPIO), it signals user authorization for privileged TPM operations like clearing ownership or disabling dictionary attack protection. The AT97SC3205T-H3M4400B checks this pin state before executing such commands - ensuring that sensitive actions cannot occur remotely without explicit human confirmation. If unused, PP/GPIO must be left floating or pulled low to maintain safe default behavior.
What package variant does AT97SC3205T-H3M4400B use, and how is thermal management handled?
The AT97SC3205T-H3M4400B uses the 32-pad Very Thin QFN (VQFN) package (32M3 footprint), measuring 4.0 mm × 4.0 mm × 0.90 mm with 0.40 mm pitch. Its exposed thermal pad is internally connected to GND, and Atmel specifies that this pad must be soldered to a PCB copper pour tied to the system ground plane. This connection provides both thermal dissipation (critical during sustained crypto operations) and improved EMI performance. No external heatsink is required under typical operating conditions, but proper pad layout and solder coverage are essential for reliability.
AT97SC3205T-H3M4400B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
AT97SC3205T-H3M4400B FAQ
1.How can I place an order for AT97SC3205T-H3M4400B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4400B 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-H3M4400B reliable?
The price and inventory of AT97SC3205T-H3M4400B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4400B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4400B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4400B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4400B?
AT97SC3205T-H3M4400B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4400B 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-H3M4400B?
For technical support, including AT97SC3205T-H3M4400B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4400B requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4400B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4400B 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-H3M4400B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4400B?
All AT97SC3205T-H3M4400B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4400B, 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-H3M4400B part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4400B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M4400B Tags
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