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Microchip Technology AT97SC3205T-H3M4B10B
- Part No.:
- AT97SC3205T-H3M4B10B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4B10B.pdf
- Description:
- PROD STD IND I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205T-H3M4B10B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring an AVR RISC microprocessor, hardware asymmetric crypto engine, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400 kHz and supports industrial temperature range (−40°C to +85°C) in 32-pad QFN package.
For engineers reviewing the AT97SC3205T-H3M4B10B datasheet, AT97SC3205T-H3M4B10B pinout, AT97SC3205T-H3M4B10B application, or AT97SC3205T-H3M4B10B equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in secure boot and firmware attestation, and confirmed alternative TPM modules for embedded system design.
Technical Context
The AT97SC3205T-H3M4B10B integrates an AVR 8-bit RISC CPU with dedicated cryptographic accelerators for RSA key generation, HMAC, AES encryption, and SHA hashing - all FIPS-140-2 Level 2 certified. Its internal EEPROM stores RSA keys and 2066 bytes of user-defined NV data.
It communicates exclusively via I²C (SM_DAT/SM_CLK) at 100 kHz standard or 400 kHz fast mode, supports low-power deep-sleep recovery via TWI_Wakeup# pins, and provides hardware physical presence detection through PP/GPIO. GPIO-Express-00 and TestBI/GPIO/XTAMPER offer configurable I/O with internal pull-up/pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification compliant - enables standardized secure boot, remote attestation, and sealed storage in PC and embedded platforms. |
| I²C Interface Speed | Up to 400 kHz fast mode - requires 800 Ω pull-up on SM_DAT and 1.5 kΩ on SM_CLK for stable operation at rated speed. |
| Supply Voltage | 3.3 V ±10% - mandates tight decoupling: 2200–4700 pF capacitors within 5 mm of each VCC pin and 0.1 µF near VCC node. |
| NV Storage Capacity | 2066 bytes user-defined data - allocated in TPM NV space for persistent configuration, credentials, or policy variables. |
| Crypto Certification | FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, RSA - satisfies government and enterprise security validation requirements. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade deployment in edge gateways, network appliances, and ruggedized controllers. |
| Package Type | 32-pad QFN (32M3), 4.0 × 4.0 × 0.90 mm, 0.40 mm pitch - exposes thermal pad tied internally to GND for PCB-level heat dissipation. |
Pinout & Package
AT97SC3205T-H3M4B10B uses a 32-pad Very Thin QFN (32M3) package with exposed thermal pad connected to GND. Pin layout supports I²C communication, GPIO flexibility, hardware physical presence signaling, and low-power wake-up control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires localized decoupling (2200–4700 pF) within 5 mm of pin and global 0.1 µF bypass. |
| GND | Ground reference | System ground; substrate center pad is internally tied to GND - may be left floating or soldered to PCB ground plane. |
| SM_DAT / SM_CLK | I²C bidirectional data/clock | Primary host interface; supports 400 kHz fast mode with specific pull-up values (800 Ω / 1.5 kΩ) and 50% duty cycle clock for stability. |
| PP/GPIO | Hardware physical presence indicator | Active-high signal indicating physical access; internal pull-down - leave floating if unused. |
| GPIO-Express-00 | Configurable NV-mapped GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up - default input mode; used for XOR chain output during I/O test. |
| TWI_Wakeup# (Pins 7 & 22) | Low-power sleep recovery trigger | Both pins must be pulsed low to exit deep-sleep; pin 7 may float, pin 22 must tie to GND or VCC via 4.7 kΩ resistor. |
| TestBI/GPIO/XTAMPER | Multi-function terminal | Functions as XTAMPER (tamper detection) or GPIO; active high; tie to GND via 4.7 kΩ if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates AVR CPU, crypto engines, RNG, EEPROM, and I²C interface in one die - eliminates external co-processor or discrete security ICs. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines - enables compliance in regulated environments without additional validation effort. |
| Hardware asymmetric crypto engine | Accelerates RSA key generation and signing operations - offloads CPU and prevents software-side timing attacks on private keys. |
| Internal EEPROM for RSA keys | Securely stores multiple RSA key pairs in tamper-resistant memory - no external flash required for key persistence. |
| 2066-byte NV user storage | Dedicated non-volatile space for application-specific policies, credentials, or measurement logs - accessible via standard TCG commands. |
Applications
| Secure Boot Authentication | Firmware Integrity Attestation |
|---|---|
Use Scenario: Verifying signed bootloader and OS image integrity before execution in industrial gateways. IC Role / Device Role / Timing Role: TPM performs SHA-256 hashing and RSA signature verification of boot components using keys stored in internal EEPROM. Use Value: Prevents unauthorized firmware modification by binding execution to cryptographically verified measurements stored in PCR registers. | Use Scenario: Remote verification of running firmware version and configuration state in cloud-connected PLCs. IC Role / Device Role / Timing Role: Generates quote structures containing PCR values and signs them with endorsement key for server-side validation. Use Value: Enables zero-trust architecture by proving device identity and runtime integrity without exposing sensitive keys over the network. |
| Hardware Physical Presence Control | Sealed Storage for Credentials |
Use Scenario: Enabling privileged TPM operations (e.g., key deletion, dictionary attack lockout) only when physical button is pressed. IC Role / Device Role / Timing Role: PP/GPIO pin detects mechanical switch closure; TPM enforces policy requiring active-high assertion before executing protected commands. Use Value: Mitigates remote privilege escalation by enforcing human-in-the-loop authorization for high-risk administrative actions. | Use Scenario: Storing Wi-Fi credentials, TLS certificates, or API tokens in encrypted, access-controlled NV space on medical IoT edge devices. IC Role / Device Role / Timing Role: Uses TPM_NV_DefineSpace and TPM_NV_Write to write data under authorization policies tied to platform state. Use Value: Protects secrets from extraction via memory dump or firmware readout - decryption requires valid TPM session and correct PCR state. |
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 SLB9665TT2.0 | Same TPM 1.2 compliance, 32-pin QFN, but uses SPI interface instead of I²C; includes optional LPC interface support. | Requires SPI host controller instead of I²C; lacks GPIO-Express-00 and XTAMPER functionality. | Select when SPI-native host SoC is used and tamper detection is not required. |
| Nuvoton NPCT750AAX1G | TPM 1.2 compliant, 32-pin QFN, I²C interface at 400 kHz, but no FIPS-140-2 certification for full crypto suite - RNG only certified. | Lower assurance level for government/enterprise deployments; missing HMAC/AES/SHA/RSA FIPS validation. | Select for cost-sensitive commercial applications where full FIPS-140-2 Level 2 is not mandated. |
Compared with SLB9665TT2.0 and NPCT750AAX1G, the AT97SC3205T-H3M4B10B uniquely combines I²C interface, full FIPS-140-2 Level 2 certification across all crypto engines, and integrated GPIO/XTAMPER for tamper-aware designs - making it optimal for industrial systems requiring both protocol simplicity and high-assurance security.
Availability
AT97SC3205T-H3M4B10B is available at Aetrix Electronics and suitable for secure boot authentication, firmware attestation, hardware physical presence enforcement, and sealed credential storage requiring stable component supply across industrial lifecycle durations.
Supply support for AT97SC3205T-H3M4B10B 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 its trusted computing product lines. The company specializes in microcontrollers, analog, and security ICs for industrial, automotive, and communications markets.
The AT97SC3205T-H3M4B10B belongs to Atmel's TPM family designed specifically for embedded systems needing hardware-rooted trust - enabling secure boot, remote attestation, and protected key storage without external security co-processors.
FAQ
What is the primary interface protocol supported by the AT97SC3205T-H3M4B10B?
The AT97SC3205T-H3M4B10B uses an I²C interface with SM_DAT and SM_CLK pins supporting both 100 kHz standard mode and 400 kHz fast mode. Pull-up resistors of 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK are recommended for reliable 400 kHz operation. The AT97SC3205T-H3M4B10B does not support SPI or LPC interfaces.
Does the AT97SC3205T-H3M4B10B include FIPS-140-2 certification, and which components are covered?
Yes, the AT97SC3205T-H3M4B10B is FIPS-140-2 Level 2 certified for its Random Number Generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This certification covers the complete hardware-based crypto subsystem - not just the RNG - enabling compliance in government and regulated enterprise deployments. The AT97SC3205T-H3M4B10B certificate number is documented in the official Atmel validation report.
How is hardware physical presence implemented on the AT97SC3205T-H3M4B10B?
The AT97SC3205T-H3M4B10B implements hardware physical presence via the PP/GPIO pin, which is active-high and features an internal pull-down resistor. When asserted, it enables privileged TPM commands like TPM_FlushSpecific or dictionary attack lockout reset. The AT97SC3205T-H3M4B10B requires this pin to be driven high by an external mechanical switch or logic signal to authorize such operations.
What is the purpose and configuration requirement of the TWI_Wakeup# pins on the AT97SC3205T-H3M4B10B?
The AT97SC3205T-H3M4B10B uses two TWI_Wakeup# pins (pins 7 and 22 in QFN) to recover from deep-sleep mode after issuing TPM_DeepSleep command. Both pins must be pulsed low simultaneously to exit sleep. Pin 7 may float or tie to GND; pin 22 must connect to GND or VCC via 4.7 kΩ resistor. This dual-pin requirement prevents accidental wake-up and enhances power-state reliability.
Can the AT97SC3205T-H3M4B10B store custom user data, and how much space is available?
Yes, the AT97SC3205T-H3M4B10B provides 2066 bytes of non-volatile (NV) user-defined storage space mapped to TPM_NV_INDEX_USER. This space is accessed via standard TCG commands (TPM_NV_DefineSpace, TPM_NV_Write, TPM_NV_Read) and protected by authorization policies. The AT97SC3205T-H3M4B10B allocates this space separately from RSA key storage and PCR registers, ensuring isolation for application-specific credentials or logs.
AT97SC3205T-H3M4B10B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- 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-H3M4B10B FAQ
1.How can I place an order for AT97SC3205T-H3M4B10B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4B10B 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-H3M4B10B reliable?
The price and inventory of AT97SC3205T-H3M4B10B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4B10B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4B10B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4B10B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4B10B?
AT97SC3205T-H3M4B10B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4B10B 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-H3M4B10B?
For technical support, including AT97SC3205T-H3M4B10B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4B10B requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4B10B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4B10B 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-H3M4B10B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4B10B?
All AT97SC3205T-H3M4B10B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4B10B, 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-H3M4B10B part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4B10B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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