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Microchip Technology AT97SC3205T-H3M4B20B
- Part No.:
- AT97SC3205T-H3M4B20B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4B20B.pdf
- Description:
- PROD STD IND I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,057
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Product details
Overview
AT97SC3205T-H3M4B20B from Microchip Technology (formerly Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC integrating 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 (400kHz Fast Mode) and targets secure boot, platform authentication, and key management in embedded computing systems.
For engineers reviewing the AT97SC3205T-H3M4B20B datasheet, AT97SC3205T-H3M4B20B pinout, AT97SC3205T-H3M4B20B application, or AT97SC3205T-H3M4B20B equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed GPIO-Express mapping, industrial temperature range (-40°C to +85°C), and QFN-32 package mechanical data per JEDEC MO-220.
Technical Context
The AT97SC3205T-H3M4B20B implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, session management, and cryptographic acceleration for RSA-2048 signing, SHA-1 hashing, HMAC-SHA1 authentication, and AES-128 encryption. Its internal EEPROM stores persistent RSA keys and NV user data without host intervention.
It uses a dedicated hardware RNG certified to FIPS-140-2 Annex C, feeds entropy into all crypto operations, and supports low-power sleep recovery via TWI_Wakeup# dual-pin activation. The I²C interface requires precise pull-up values (800Ω on SM_DAT, 1.5kΩ on SM_CLK) for stable 400kHz operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification fully implemented in hardware and firmware; no host-side protocol stack required. |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC, AES-128, SHA-1, and RSA-2048 engines integrated; offloads all TCG primitive operations. |
| I²C Interface | 400kHz Fast Mode / 100kHz Standard Mode; SM_DAT and SM_CLK require specific pull-ups (800Ω and 1.5kΩ) for reliable high-speed timing. |
| Nonvolatile Storage | 2066 bytes of user-defined NV space in internal EEPROM; separate from RSA key storage managed automatically by TPM firmware. |
| Supply Voltage | 3.3V ±10%; requires decoupling capacitors (2200–4700pF near each VCC pin, 0.1μF at VCC node) within strict layout distances (<5mm and <10mm respectively). |
| Operating Temperature | -40°C to +85°C industrial grade; validated across full range for continuous TPM command execution and crypto operation stability. |
| Package Type | 32-pad QFN (32M3), 4.0mm × 4.0mm × 0.90mm body, 0.40mm pitch, exposed thermal pad tied to GND. |
Pinout & Package
AT97SC3205T-H3M4B20B is packaged in a 32-pad Very Thin QFN (32M3) per JEDEC MO-220, with 4.0×4.0 mm body, 0.40 mm pitch, and exposed center thermal pad internally connected to GND. Pinout validated per Atmel-8883AS datasheet summary Figure 1-1 and Table 1-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires localized decoupling (2200–4700pF) within 5mm of each VCC pin and shared 0.1μF capacitor at VCC node. |
| GND | Ground reference | System ground; center thermal pad is electrically tied to GND and must be soldered or left floating per layout requirements. |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data; requires 800Ω pull-up for stable 400kHz operation; shares bus with host controller using standard TCG TPM command framing. |
| SM_CLK | I²C clock input | Input-only clock; requires 1.5kΩ pull-up and ~50% duty cycle for optimal signal integrity at 400kHz; not software-controllable. |
| GPIO-Express-00 | Dedicated NV-mapped GPIO | Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up; used for platform-specific state signaling without firmware modification. |
| PP/GPIO | Physical Presence indicator | Active-high hardware PP signal; internal pull-down; asserts physical presence for sensitive commands like ClearOwner or DisableTPM. |
| TWI_Wakeup# | Low-power recovery trigger | Two-pin active-low wakeup sequence required to exit deep sleep; both pins must be pulsed low simultaneously to resume I²C communication. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates CPU (AVR®), crypto accelerators, RNG, EEPROM, and I²C interface in one die-no external components needed for core TPM functionality. |
| FIPS-140-2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines; enables compliance-critical deployments in government and enterprise infrastructure without additional validation effort. |
| Hardware-based key protection | RSA private keys stored exclusively in internal EEPROM with no software-accessible path; protected by physical security circuitry and tamper detection logic. |
| Dynamic key cache management | Automatically loads/unloads RSA keys from EEPROM to SRAM based on TCG commands (e.g., TPM_LoadKey2); eliminates host driver complexity for key lifecycle handling. |
| Industrial-grade reliability | Qualified from -40°C to +85°C with validated I²C timing margins, reset pulse width (≥2μs), and power-rail noise immunity per decoupling guidelines. |
Applications
| Secure Boot Authentication | Platform Integrity Verification |
|---|---|
Use Scenario: Verifying firmware signature before UEFI/BIOS execution in x86 or ARM-based industrial controllers. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; measures boot components into Platform Configuration Registers (PCRs) and signs PCR values using embedded RSA-2048 keys. Use Value: Prevents unauthorized firmware injection by cryptographically binding boot sequence to hardware-bound keys stored only in AT97SC3205T-H3M4B20B EEPROM. | Use Scenario: Detecting runtime tampering in medical imaging devices where firmware integrity must be continuously monitored. IC Role / Device Role / Timing Role: TPM monitors memory regions and logs changes to PCRs; triggers alert via PIRQ# interrupt when mismatch detected during scheduled health checks. Use Value: Enables real-time platform attestation using SHA-1 hashing engine and persistent NV storage for audit logs-no host CPU overhead for crypto computation. |
| Hardware-Based Key Management | Secure Remote Attestation |
Use Scenario: Storing and managing TLS private keys for encrypted communication in networked IoT gateways operating in harsh environments. IC Role / Device Role / Timing Role: TPM serves as secure key vault; performs RSA signing and AES encryption/decryption on-demand via I²C; keys never leave device boundary. Use Value: Eliminates need for external secure element or software key storage; leverages FIPS-140-2 certified crypto engines for NIST-compliant key protection. | Use Scenario: Authenticating edge servers in cloud-managed industrial automation systems during onboarding and periodic revalidation. IC Role / Device Role / Timing Role: TPM generates signed quotes containing PCR values and nonce; host forwards quote to remote verifier for trust assessment. Use Value: Provides verifiable proof of unmodified software stack using AT97SC3205T-H3M4B20B's hardware RNG and SHA-1 engine-no reliance on host OS security. |
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 TCG 1.2 compliance, SPI interface instead of I²C; includes optional LPC interface; larger 48-pin TQFP package. | Requires SPI host controller and different PCB layout; supports higher throughput but lacks GPIO-Express-00 pin for direct NV index access. | Select if host system has SPI bandwidth headroom and needs multi-interface flexibility; not drop-in compatible due to interface and pinout mismatch. |
| Nuvoton NPCT750KB0DX | TCG 1.2 compliant, I²C interface at 400kHz, 32-pin QFN package; lacks FIPS-140-2 certification for RNG and crypto engines. | Suitable for cost-sensitive designs where formal crypto certification is not mandated; no hardware-enforced physical presence (PP) signaling. | Choose for non-regulated commercial applications where AT97SC3205T-H3M4B20B's FIPS-140-2 certification and PP/GPIO pin are not required. |
Compared with SLB9665TT2.0 and NPCT750KB0DX, AT97SC3205T-H3M4B20B uniquely combines I²C compatibility, FIPS-140-2 certification across all crypto blocks, GPIO-Express-00 for direct NV indexing, and industrial temperature support in a compact 32-pin QFN-making it optimal for space-constrained, compliance-driven embedded platforms.
Availability
AT97SC3205T-H3M4B20B is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity verification, and hardware-based key management requiring stable component supply across industrial temperature ranges and long-term lifecycle support.
Supply support for AT97SC3205T-H3M4B20B 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. The company specializes in microcontrollers, analog, FPGA, and trusted computing solutions.
The AT97SC3205T-H3M4B20B belongs to Atmel's TPM product line, designed specifically for embedded systems requiring hardware-rooted trust, cryptographic acceleration, and TCG 1.2 compliance without host CPU overhead.
FAQ
What is the primary interface type and speed supported by the AT97SC3205T-H3M4B20B?
The AT97SC3205T-H3M4B20B uses an I²C interface supporting both 400kHz Fast Mode and 100kHz Standard Mode. Stable 400kHz operation requires precise external pull-up resistors: 800Ω on SM_DAT and 1.5kΩ on SM_CLK. The interface implements the full TCG TPM 1.2 command set over I²C, with no SPI or LPC alternatives available for this variant.
Does the AT97SC3205T-H3M4B20B include FIPS-140-2 certification, and which components are covered?
Yes, the AT97SC3205T-H3M4B20B is FIPS-140-2 certified for its hardware Random Number Generator (RNG), HMAC, AES, SHA, and RSA engines. This certification covers the entire cryptographic subsystem-including entropy generation, key derivation, and algorithm execution-and is documented in the official Atmel certification report referenced in the datasheet summary.
What is the purpose and behavior of the TWI_Wakeup# pins on the AT97SC3205T-H3M4B20B?
The AT97SC3205T-H3M4B20B uses two TWI_Wakeup# pins (pins 7 and 22 in QFN) to recover from low-power deep sleep mode. Both pins must be pulsed active-low simultaneously to exit sleep and restore I²C communication. If unused, pin 7 may float or tie to GND; pin 22 must be tied to GND or VCC-failure to meet this dual-signal requirement prevents wake-up.
How is nonvolatile storage allocated in the AT97SC3205T-H3M4B20B, and what can it be used for?
The AT97SC3205T-H3M4B20B provides 2066 bytes of user-defined NV storage in internal EEPROM, separate from RSA key storage. This space is accessible via TCG TPM_NV_Write/Read commands and mapped to indices such as TPM_NV_INDEX_GPIO_00. It supports persistent configuration data, audit logs, or platform-specific credentials without consuming key storage resources.
What GPIO functionality is available on the AT97SC3205T-H3M4B20B, and how does GPIO-Express-00 differ from standard GPIO?
The AT97SC3205T-H3M4B20B offers multiple GPIOs: GPIO (general-purpose, no internal resistor), GPIO-Express-00 (mapped to TPM_NV_INDEX_GPIO_00, internal pull-up), PP/GPIO (hardware Physical Presence indicator, internal pull-down), and TestBI/GPIO/XTAMPER (dual-function, internal pull-down). GPIO-Express-00 enables direct NV-indexed read/write without custom firmware, simplifying platform state tracking in secure boot flows.
AT97SC3205T-H3M4B20B 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-H3M4B20B FAQ
1.How can I place an order for AT97SC3205T-H3M4B20B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4B20B 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-H3M4B20B reliable?
The price and inventory of AT97SC3205T-H3M4B20B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4B20B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4B20B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4B20B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4B20B?
AT97SC3205T-H3M4B20B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4B20B 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-H3M4B20B?
For technical support, including AT97SC3205T-H3M4B20B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4B20B requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4B20B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4B20B 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-H3M4B20B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4B20B?
All AT97SC3205T-H3M4B20B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4B20B, 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-H3M4B20B part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4B20B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M4B20B Tags
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