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Microchip Technology AT97SC3205T-H3M4C00B
- Part No.:
- AT97SC3205T-H3M4C00B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4C00B.pdf
- Description:
- PROD FF IND I2C TPM 4X4 32VQFN C
- Quantity:
- Payment:
- Shipping:
Inventory:196
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Product details
Overview
AT97SC3205T-H3M4C00B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring an integrated AVR® RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066 bytes of user NV storage. It operates at 3.3V with I²C interface up to 400 kHz and targets secure boot and platform authentication in industrial embedded systems.
For engineers reviewing the AT97SC3205T-H3M4C00B datasheet, AT97SC3205T-H3M4C00B pinout, AT97SC3205T-H3M4C00B application, or AT97SC3205T-H3M4C00B equivalent, key selection factors include TPM 1.2 compliance, I²C timing constraints (SM_DAT/SM_CLK pull-up guidance), GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, low-power deep-sleep recovery via TWI_Wakeup#, and dual-package support (28-pin TSSOP / 32-pad QFN).
Technical Context
The AT97SC3205T-H3M4C00B integrates a dedicated AVR 8-bit RISC CPU with on-chip EEPROM for RSA key storage and SRAM for runtime operations. Its crypto subsystem includes FIPS-140-2 validated RNG, HMAC, AES-128, SHA-1, and RSA-2048 engines - all implemented in hardened hardware logic, not software libraries.
Communication occurs exclusively over I²C (SM_DAT/SM_CLK), supporting Standard Mode (100 kHz) and Fast Mode (400 kHz) with strict duty-cycle and pull-up resistor requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK). The device supports hardware physical presence (PP/GPIO) and low-power deep-sleep recovery via dual active-low TWI_Wakeup# pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TPM Specification | TCG TPM 1.2 compliant - enables standardized platform integrity attestation and sealed storage. |
| I²C Interface Speed | Up to 400 kHz Fast Mode - requires precise 50% SM_CLK duty cycle and specified pull-ups (800 Ω SM_DAT, 1.5 kΩ SM_CLK) for stable operation. |
| Supply Voltage | 3.3 V ±10% - mandates tight decoupling: 2200–4700 pF caps <5 mm from each VCC–GND pair + 0.1 µF cap <10 mm at VCC node. |
| NV Storage Capacity | 2066 bytes user-defined data - allocated in TPM NV space, accessible via TCG commands like TPM_NV_Write/Read. |
| Crypto Certification | FIPS-140-2 Level 2 certified - covers RNG, HMAC, AES, SHA, and RSA engines; validates cryptographic integrity for government and regulated systems. |
| Operating Temperature | −40°C to +85°C industrial range - qualified for extended thermal environments without derating. |
| Package Options | 28-pin Thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) or 32-pad QFN (4.0 × 4.0 mm, 0.40 mm pitch) - both RoHS-compliant and lead-free. |
Pinout & Package
AT97SC3205T-H3M4C00B is offered in two RoHS-compliant packages: 28-pin Thin TSSOP (4.40 mm × 9.70 mm body, 0.65 mm pitch) and 32-pad QFN (4.00 mm × 4.00 mm body, 0.40 mm pitch). Both packages feature exposed thermal pads tied internally to GND (QFN center pad) and require specific PCB layout for noise immunity and power integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires localized 2200–4700 pF decoupling <5 mm to adjacent GND and global 0.1 µF cap <10 mm at VCC node. |
| SM_DAT / SM_CLK | I²C bidirectional data/clock | Interface pins for TPM host communication; SM_DAT pull-up = 800 Ω, SM_CLK pull-up = 1.5 kΩ for 400 kHz operation; 50% duty cycle critical. |
| GPIO-Express-00 | Dedicated NV-mapped GPIO | Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up; floats when unused; used for persistent state signaling or tamper detection. |
| PP/GPIO | Hardware Physical Presence | Active-high indicator for physical admin access; internal pull-down; floats when unused; required for certain TPM administrative commands. |
| TWI_Wakeup# (pins 7 & 22) | Deep-sleep recovery trigger | Both pins must be pulsed low simultaneously to exit TPM_DeepSleep mode; pin 22 must be tied to GND/VCC; pin 7 may float or tie to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 implementation | Eliminates external firmware dependencies and reduces BOM count - full TCG stack executed on-chip with AVR CPU and dedicated crypto accelerators. |
| FIPS-140-2 Level 2 certification | Validates RNG entropy quality, AES/SHA/RSA algorithm correctness, and physical security countermeasures - meets U.S. federal and defense system requirements. |
| 2066-byte user NV storage | Provides persistent, authenticated non-volatile memory for keys, certificates, or policy flags - managed via standard TCG NV commands without host-side driver logic. |
| Hardware Physical Presence (PP) support | Enables secure administrative workflows requiring physical confirmation - PP/GPIO pin asserts high during authorized maintenance, blocking remote privilege escalation. |
| Low-power deep-sleep with dual-wakeup | Reduces idle current significantly; recovery requires coordinated low pulse on two TWI_Wakeup# pins - prevents accidental wake events and improves system-level power budgeting. |
Applications
| Secure Boot Authentication | Platform Integrity Attestation |
|---|---|
Use Scenario: Verifying firmware signature and measurement chain before OS load in industrial gateways. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust executing PCR extension and sealed storage of boot log. Use Value: Prevents unauthorized firmware execution by cryptographically binding boot state to hardware identity using RSA-2048 and SHA-1 engines. | Use Scenario: Remote verification of server hardware configuration and BIOS version in cloud infrastructure. IC Role / Device Role / Timing Role: TPM 1.2 attestation engine generating signed quotes of Platform Configuration Registers (PCRs). Use Value: Enables zero-trust architecture by providing cryptographically verifiable evidence of unmodified platform state via TPM_Quote command. |
| Hardware-Based Key Vault | Physical Presence-Controlled Admin Access |
Use Scenario: Storing TLS private keys for encrypted telemetry in edge IoT sensors. IC Role / Device Role / Timing Role: Secure NV storage and hardware-accelerated RSA decryption for key wrapping/unwrapping. Use Value: Protects private keys from extraction even under full system compromise - keys never leave TPM boundary and are accessed only via authenticated TCG commands. | Use Scenario: Enabling BIOS update or TPM clear only when technician presses physical button on industrial HMI panel. IC Role / Device Role / Timing Role: Hardware Physical Presence (PP/GPIO) input enforcing physical authorization for privileged operations. Use Value: Blocks remote reset or reconfiguration attacks by requiring local human intervention - PP/GPIO must be asserted high before TPM_PhysicalEnable or TPM_Clear. |
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 SLB9670 | TPM 2.0 compliant; supports SHA-256 and ECC; no AVR core - uses proprietary secure processor. | Required for new designs targeting Windows 11 or modern Linux distros mandating TPM 2.0; lacks GPIO-Express-00 mapping. | Select SLB9670 if upgrading to TPM 2.0 compliance is mandatory; verify host firmware supports 2.0 command set and ECC-based attestation. |
| Nuvoton NPCT750 | TPM 1.2 compliant; integrated ARM Cortex-M0+; supports same I²C speeds and 3.3 V supply; smaller 5×5 mm QFN package. | Offers lower footprint and higher integration density; shares identical TCG command compatibility but differs in GPIO assignment and NV index layout. | Select NPCT750 when board space is constrained and identical TPM 1.2 behavior is required; validate GPIO-Express-00 replacement mapping in NV space. |
Compared with Infineon SLB9670 and Nuvoton NPCT750, the AT97SC3205T-H3M4C00B provides proven TPM 1.2 interoperability with legacy industrial BIOS/firmware, deterministic AVR-based execution, and explicit GPIO-Express-00 support for custom NV-triggered workflows - making it optimal for long-lifecycle embedded deployments where backward compatibility and pin-level control are critical.
Availability
AT97SC3205T-H3M4C00B is available at Aetrix Electronics and suitable for industrial gateways, secure edge IoT nodes, and embedded PC platforms requiring stable component supply, long-term lifecycle assurance, and TCG-compliant hardware root-of-trust functionality.
Supply support for AT97SC3205T-H3M4C00B 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 leader in microcontrollers, analog, and security solutions.
The AT97SC3205T product line delivers certified, single-chip TPM 1.2 modules for embedded systems needing hardware-enforced platform integrity, secure key storage, and physical presence enforcement - designed specifically for industrial, networking, and compute applications with long design-in horizons.
FAQ
What is the primary function of the AT97SC3205T-H3M4C00B in a system?
The AT97SC3205T-H3M4C00B serves as a hardware root-of-trust implementing the TCG TPM 1.2 specification. It performs secure boot verification, platform attestation, cryptographic key generation/storage, and hardware-enforced access control. Its integrated AVR CPU and FIPS-140-2 certified crypto engines enable these functions without host CPU involvement, ensuring isolation from software-level attacks.
Does the AT97SC3205T-H3M4C00B support TPM 2.0?
No, the AT97SC3205T-H3M4C00B implements only TPM 1.2 per the TCG specification. It does not support TPM 2.0 features such as SHA-256, ECC algorithms, or the updated command hierarchy. For TPM 2.0 compliance, alternatives like the Infineon SLB9670 must be evaluated. The AT97SC3205T-H3M4C00B remains fully functional in legacy TPM 1.2 ecosystems.
How is low-power operation managed on the AT97SC3205T-H3M4C00B?
The AT97SC3205T-H3M4C00B enters low-power sleep automatically during idle periods. Recovery requires a coordinated active-low pulse on both TWI_Wakeup# pins (pins 7 and 22), as defined in the TPM_DeepSleep command. Pin 22 must be tied to GND or VCC; pin 7 may float or connect to GND. This dual-signal mechanism prevents spurious wake events and ensures deterministic power-state transitions.
What are the I²C interface requirements for reliable 400 kHz operation with the AT97SC3205T-H3M4C00B?
For stable 400 kHz I²C operation, the AT97SC3205T-H3M4C00B requires SM_DAT pull-up = 800 Ω and SM_CLK pull-up = 1.5 kΩ. The SM_CLK signal must maintain a near-50% duty cycle - deviations degrade timing margin. Layout best practices include minimizing trace length, avoiding stubs, and separating I²C routing from noisy digital lines to preserve signal integrity.
Can the GPIO-Express-00 pin on the AT97SC3205T-H3M4C00B be used for general-purpose I/O?
GPIO-Express-00 is hard-mapped to TPM_NV_INDEX_GPIO_00 and configured as an input by default with internal pull-up. While it functions electrically as a GPIO, its firmware role is fixed to that NV index - it cannot be reassigned to arbitrary functions. If unused, it should be left floating due to the internal pull-up; tying it externally may interfere with NV state reads/writes.
AT97SC3205T-H3M4C00B 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:
- 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-H3M4C00B FAQ
1.How can I place an order for AT97SC3205T-H3M4C00B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4C00B 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-H3M4C00B reliable?
The price and inventory of AT97SC3205T-H3M4C00B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4C00B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4C00B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4C00B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4C00B?
AT97SC3205T-H3M4C00B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4C00B 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-H3M4C00B?
For technical support, including AT97SC3205T-H3M4C00B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4C00B requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4C00B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4C00B 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-H3M4C00B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4C00B?
All AT97SC3205T-H3M4C00B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4C00B, 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-H3M4C00B part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4C00B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M4C00B Tags
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