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Microchip Technology AT97SC3205T-H3M4620B
- Part No.:
- AT97SC3205T-H3M4620B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4620B.pdf
- Description:
- PROD FF IND I2C TPM 4X4 32VQFN S
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205T-H3M4620B 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 bytes of user NV storage. It operates at 3.3V with I²C interface up to 400 kHz and supports industrial temperature range (−40°C to +85°C) in QFN or TSSOP packages.
For engineers reviewing the AT97SC3205T-H3M4620B datasheet, AT97SC3205T-H3M4620B pinout, AT97SC3205T-H3M4620B application, or AT97SC3205T-H3M4620B equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed FIPS-140-2 certification scope, exact GPIO mapping for TPM_NV_INDEX_GPIO_00, and precise thermal and package dimensions for layout integration.
Technical Context
The AT97SC3205T-H3M4620B 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 independent hardware engines for RSA, AES, SHA-1, HMAC, and a FIPS-140-2 certified PRNG - all operating under strict physical security circuitry.
Communication occurs exclusively via I²C (SM_DAT/SM_CLK), supporting 100 kHz standard mode and 400 kHz fast mode with defined pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK). Low-power sleep recovery requires dual active-low TWI_Wakeup# pulses, and hardware physical presence is signaled via PP/GPIO with internal pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation per TCG Main Specification Parts 1–3 |
| 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 |
| FIPS Certification | FIPS-140-2 Level 2 certified module including RNG, HMAC, AES, SHA, and RSA engines |
| NV Storage Capacity | 2066 bytes of user-defined non-volatile storage accessible via TPM_NV_Write/TPM_NV_Read commands |
| Supply Voltage | 3.3 V ±10%; requires decoupling with 2200–4700 pF capacitors <5 mm from each VCC pin and 0.1 µF at VCC node |
| Operating Temperature | −40°C to +85°C industrial grade; reset pulse width ≥2 µs; LRESET# must remain asserted until VCC stabilizes |
| Package Options | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch) or 28-pin Thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) |
Pinout & Package
AT97SC3205T-H3M4620B is offered in a 32-pad Very Thin QFN (32M3) package with exposed thermal pad tied internally to GND. Pinout reflects full I²C interface, GPIO resources mapped to TPM_NV_INDEX_GPIO_00 and PP/GPIO, dual TWI_Wakeup# pins for deep-sleep recovery, and dedicated PIRQ# interrupt output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires localized 2200–4700 pF bypass caps <5 mm from each VCC pin and 0.1 µF at VCC node |
| GND | Ground reference | System ground; QFN center pad is internally connected to GND and may be left floating or tied externally |
| SM_DAT / SM_CLK | I²C bidirectional data/clock | Supports 100 kHz standard / 400 kHz fast mode; pull-up values critical for signal integrity at max speed |
| GPIO-Express-00 | TPM NV-mapped GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up; default configured as input; leave floating if unused |
| PP/GPIO | Physical presence indicator | Active-high hardware physical presence signal with internal pull-down; used for secure boot enforcement |
| TWI_Wakeup# (pins 7 & 22) | Deep-sleep recovery trigger | Both pins must be pulsed low simultaneously to exit TPM_DeepSleep state; pin 22 must be tied to GND or VCC |
| PIRQ# | Interrupt request output | Active-low interrupt signaling TPM event completion; tie to GND via 4.7 kΩ if unused |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | Offloads RSA key generation and signing from host CPU; eliminates software-based timing side-channel vulnerabilities |
| FIPS-140-2 Certified RNG | Provides cryptographically secure random numbers for key derivation and protocol nonces without host dependency |
| Internal EEPROM for RSA Keys | Securely stores multiple private keys in tamper-resistant memory; no external flash required for key persistence |
| TPM_NV_INDEX_GPIO_00 Mapping | Enables direct firmware-controlled access to GPIO state via standardized TPM NV read/write commands |
| Hardware Physical Presence (PP) | Enforces user-confirmed authorization for sensitive operations (e.g., clearing platform configuration) via dedicated PP/GPIO pin |
Applications
| Server Platform Integrity | Industrial Control Secure Boot |
|---|---|
Use Scenario: Verifying firmware authenticity and measuring boot sequence integrity during server power-on. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; performs SHA-1 hashing of BIOS/UEFI components and stores measurements in PCR registers. Use Value: Enables remote attestation of server health via TPM Quote command using FIPS-certified SHA-1 and RSA signature engines. | Use Scenario: Ensuring only authorized firmware loads on programmable logic controllers in factory automation systems. IC Role / Device Role / Timing Role: TPM enforces secure boot chain by validating digital signatures of bootloader and application firmware before execution. Use Value: Prevents unauthorized firmware updates using hardware-backed RSA verification and protected NV storage for public key certificates. |
| Embedded Device Identity Provisioning | IoT Edge Node Data Sealing |
Use Scenario: Provisioning unique device identity and cryptographic credentials during manufacturing test. IC Role / Device Role / Timing Role: TPM generates and stores device-specific RSA key pairs in internal EEPROM; exposes them via TPM_GetPubKey command. Use Value: Eliminates need for external secure element or cloud-based key generation; meets NIST SP 800-193 requirements for hardware-rooted identity. | Use Scenario: Encrypting sensor telemetry before transmission in edge gateways with intermittent connectivity. IC Role / Device Role / Timing Role: TPM seals encryption keys to platform state (PCR values); unseals only when measured boot state matches expected hash. Use Value: Ensures encrypted data remains inaccessible if firmware is tampered with - leveraging FIPS-certified AES and secure NV storage. |
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 |
|---|---|---|---|
| ST33TPHF2Xx (STMicroelectronics) | TPM 1.2 compliant; uses ARM SecurCore SC300 core; supports SPI and I²C; 2.5–3.6 V supply | Offers SPI interface option not available on AT97SC3205T-H3M4620B; different GPIO mapping and NV index structure | Select when SPI host interface or broader voltage range is required; verify compatibility with existing TPM command parser |
| SLB9665TT (Infineon) | TPM 1.2 compliant; based on 32-bit ARM Cortex-M0; supports I²C and LPC; FIPS-140-2 Level 2 certified | Includes LPC interface and additional debug features; larger footprint (7 × 7 mm QFN vs. 4 × 4 mm) | Choose for LPC-based legacy platforms or when extended debug capability is needed; board layout change required due to package size |
Compared with ST33TPHF2Xx and SLB9665TT, the AT97SC3205T-H3M4620B offers the smallest QFN footprint (4.0 × 4.0 mm), AVR-based deterministic execution for timing-sensitive crypto operations, and direct GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00 - making it optimal for space-constrained embedded designs requiring minimal host intervention.
Availability
AT97SC3205T-H3M4620B is available at Aetrix Electronics and suitable for server platform integrity, industrial control secure boot, and embedded device identity provisioning requiring stable component supply across long-lifecycle deployments.
Supply support for AT97SC3205T-H3M4620B 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 product support, documentation, and qualification for legacy Atmel security ICs including the AT97SC3205T series.
The AT97SC3205T-H3M4620B belongs to Atmel's Trusted Platform Module family, designed specifically to deliver TCG-compliant hardware root-of-trust for embedded systems where firmware integrity, secure key storage, and remote attestation are mandatory.
FAQ
What is the I²C clock frequency tolerance supported by the AT97SC3205T-H3M4620B?
The AT97SC3205T-H3M4620B supports I²C Standard Mode at 100 kHz and Fast Mode at 400 kHz. For reliable 400 kHz operation, SM_CLK must maintain a duty cycle close to 50%, and pull-up resistors of 1.5 kΩ on SM_CLK and 800 Ω on SM_DAT are validated. Deviations beyond ±5% duty cycle or incorrect pull-up values may cause communication failures. The AT97SC3205T-H3M4620B does not support Fast Mode Plus or High-Speed Mode.
Does the AT97SC3205T-H3M4620B require external non-volatile memory for key storage?
No, the AT97SC3205T-H3M4620B includes internal EEPROM dedicated to RSA key storage and 2066 bytes of user-defined NV storage. All cryptographic keys generated by its hardware RSA engine are stored exclusively within this protected on-die memory. External flash or EEPROM is unnecessary for TPM functionality, reducing BOM cost and attack surface. The AT97SC3205T-H3M4620B manages key caching dynamically without host intervention.
How is hardware physical presence enforced using the AT97SC3205T-H3M4620B?
Hardware physical presence is enforced via the PP/GPIO pin on the AT97SC3205T-H3M4620B, which has an internal pull-down resistor and is active-high. When asserted, it signals user presence to enable privileged TPM operations like Clear, OwnerSetDisable, or DictionaryAttackLockReset. The AT97SC3205T-H3M4620B validates this signal at command execution time - no software polling is required. Default configuration treats PP/GPIO as input; tying it high enables physical presence mode.
What are the decoupling capacitor requirements for stable operation of the AT97SC3205T-H3M4620B?
The AT97SC3205T-H3M4620B requires two tiers of decoupling: (1) 2200–4700 pF X5R/X7R ceramic capacitors placed <5 mm between each VCC pin and its adjacent GND pin; (2) a 0.1 µF X5R/X7R capacitor at the VCC node <10 mm from the device. All capacitors must be high-quality dielectric; insufficient decoupling causes I²C communication errors or unpredictable reset behavior. These requirements apply identically for both TSSOP and QFN packages of the AT97SC3205T-H3M4620B.
Can the AT97SC3205T-H3M4620B enter and recover from low-power sleep autonomously?
Yes, the AT97SC3205T-H3M4620B enters low-power sleep automatically when idle, with no host action required. Recovery requires pulsing both TWI_Wakeup# pins (pins 7 and 22) low simultaneously - a hardware-level requirement confirmed in the datasheet. Pin 22 must be tied to GND or VCC (directly or via 4.7 kΩ), while pin 7 may float or connect to GND. This dual-pin mechanism prevents spurious wakeups. The AT97SC3205T-H3M4620B does not support single-pin wake or timer-based wakeup.
AT97SC3205T-H3M4620B 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-H3M4620B FAQ
1.How can I place an order for AT97SC3205T-H3M4620B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4620B 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-H3M4620B reliable?
The price and inventory of AT97SC3205T-H3M4620B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4620B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4620B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4620B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4620B?
AT97SC3205T-H3M4620B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4620B 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-H3M4620B?
For technical support, including AT97SC3205T-H3M4620B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4620B requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4620B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4620B 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-H3M4620B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4620B?
All AT97SC3205T-H3M4620B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4620B, 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-H3M4620B part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4620B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M4620B Tags
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CYPD3175-24LQXQ
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SLB9672VU20FW1523XTMA1
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SLB9670VQ20FW785XTMA1
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SLB9672XU20FW1523XTMA1
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SLB9673XU20FW2613XTMA1
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CYPD3125-40LQXIT
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AT97SC3204-U2A1A-20
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AT97SC3204-U2A1A-10
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9672AU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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