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Microchip Technology AT97SC3205T-H3M46-00
- Part No.:
- AT97SC3205T-H3M46-00
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M46-00.pdf
- Description:
- FF IND I2C TPM 4X4 32VQFN CEK
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
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Product details
Overview
AT97SC3205T-H3M46-00 from Microchip Technology (formerly 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 supports industrial temperature range (−40°C to +85°C). Used in embedded systems requiring secure boot, key attestation, and platform integrity verification.
For engineers reviewing the AT97SC3205T-H3M46-00 datasheet, AT97SC3205T-H3M46-00 pinout, AT97SC3205T-H3M46-00 application, or AT97SC3205T-H3M46-00 equivalent, this page delivers verified electrical specs, I²C timing constraints, GPIO mapping for TPM_NV_INDEX_GPIO_00 and PP/GPIO, low-power deep-sleep recovery via TWI_Wakeup#, and package-specific decoupling guidance for stable 400 kHz operation.
Technical Context
The AT97SC3205T-H3M46-00 implements the full TCG TPM 1.2 specification using on-die EEPROM for RSA key storage and dynamic internal memory management-no host intervention required for key cache handling. Its hardware crypto engine accelerates asymmetric operations while the FIPS-140-2 certified RNG feeds both TCG protocol functions and system-level random number requests.
Communication occurs exclusively over I²C (SM_DAT/SM_CLK), supporting standard (100 kHz) and fast mode (400 kHz) with strict duty-cycle and pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK). Low-power sleep is entered automatically during idle and recovered only by dual active-low pulses on TWI_Wakeup# pins-no SPI or alternate interfaces are supported.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation per Trusted Computing Group standards. |
| I²C Interface Speed | Up to 400 kHz fast mode; requires precise 50% SM_CLK duty cycle and validated pull-ups (800 Ω SM_DAT, 1.5 kΩ SM_CLK). |
| Supply Voltage | 3.3 V ±10%; decoupling mandates 2200–4700 pF capacitors <5 mm from each VCC pin and 0.1 µF near VCC node. |
| NV Storage Capacity | 2066 bytes of user-defined non-volatile data space mapped to TPM_NV_INDEX_GPIO_00 and other indices. |
| Crypto Certification | FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, and RSA engines-valid for cryptographic validation in regulated environments. |
| Operating Temperature | Industrial grade: −40°C to +85°C; validated across full range for sustained TPM command execution and key persistence. |
| Package Options | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch) - H3M46-00 suffix denotes this variant. |
Pinout & Package
AT97SC3205T-H3M46-00 uses the 32-pad Very Thin QFN (VQFN) package (JEDEC MO-220, 32M3 outline), 4.0 × 4.0 mm body, 0.40 mm pitch, with exposed thermal pad tied internally to GND. Pin 1 identifier located at top-left corner; substrate center pad must be connected to GND for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires dedicated high-frequency decoupling (2200–4700 pF) within 5 mm of each VCC pin and 0.1 µF bulk cap near VCC node. |
| GND | System ground reference | Reference for all digital and analog circuits; substrate center pad is internally tied to GND and must be externally connected. |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data; requires external 800 Ω pull-up for reliable 400 kHz operation; sensitive to trace length and noise coupling. |
| SM_CLK | I²C clock input | Open-drain I²C clock; requires external 1.5 kΩ pull-up and near-50% duty cycle for stable high-speed communication. |
| PP/GPIO | Hardware physical presence indicator | Active-high GPIO used for TPM physical presence assertion; internal pull-down; leave floating if unused. |
| GPIO-Express-00 | Pre-mapped NV index GPIO | Directly maps to TPM_NV_INDEX_GPIO_00; internal pull-up; default input mode; used for persistent state signaling across reboots. |
| TWI_Wakeup# | Low-power sleep recovery trigger | Two dedicated pins (TSSOP pins 7 & 22, QFN pins 7 & 22); both must be pulsed low simultaneously to exit deep-sleep mode. |
| PIRQ# | Interrupt request output | Active-low open-drain interrupt signal indicating TPM event completion; requires external pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates AVR CPU, crypto engines, RNG, EEPROM, and I²C interface in one die-no external components needed for core TPM functionality. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines-enables use in government, healthcare, and financial applications requiring cryptographic validation. |
| Hardware-based RSA acceleration | Dedicated asymmetric crypto engine offloads RSA key generation and signing from host processor, reducing latency and host CPU load. |
| 2066-byte user NV storage | Non-volatile space allocated for application-specific keys, certificates, or configuration data-accessible via standardized TCG commands. |
| Automatic low-power management | Enters low-power sleep autonomously during idle periods; recovers only upon valid TWI_Wakeup# pulse sequence-no software polling required. |
Applications
| Secure Boot Authentication | Platform Integrity Measurement |
|---|---|
Use Scenario: Verifying firmware signature and hash chain before loading OS kernel in industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; measures BIOS, bootloader, and kernel hashes into Platform Configuration Registers (PCRs) prior to execution. Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to hardware identity-enabling remote attestation of boot state. | Use Scenario: Detecting runtime tampering in medical imaging controllers where firmware integrity must be continuously monitored. IC Role / Device Role / Timing Role: TPM monitors critical memory regions and logs changes to PCRs; triggers alert via PIRQ# when unauthorized write detected. Use Value: Enables real-time detection of memory corruption or malware injection without host CPU overhead-leveraging hardware-enforced PCR extension logic. |
| Hardware-Based Key Storage | Remote Attestation Service |
Use Scenario: Storing device-unique private keys for TLS mutual authentication in smart grid edge nodes. IC Role / Device Role / Timing Role: TPM securely generates, stores, and performs cryptographic operations on RSA keys in on-die EEPROM-never exposing private key material to host memory. Use Value: Eliminates risk of key extraction via memory dump or side-channel attacks-meeting NIST SP 800-193 requirements for cryptographic key protection. | Use Scenario: Proving device authenticity and configuration state to cloud-based fleet management platforms in IIoT deployments. IC Role / Device Role / Timing Role: TPM signs PCR values and platform configuration data using its endorsement key (EK); signature verified by cloud service using EK certificate. Use Value: Provides cryptographically verifiable proof of device identity and software stack integrity-enabling zero-trust access control policies. |
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 | Same TPM 1.2 compliance, but uses SPI interface instead of I²C; no TWI_Wakeup# deep-sleep recovery mechanism. | Requires SPI-capable host controller; lacks low-power wake-up flexibility for battery-powered edge devices. | Select if host design already uses SPI peripherals and power budget allows continuous polling instead of hardware-triggered wake-up. |
| Nuvoton NPCT750YAXX | TPM 2.0 compliant; supports SHA-256 and ECC in addition to RSA; higher I²C speed (1 MHz) and integrated voltage supervisor. | Enables migration to newer TCG standards; not backward-compatible with legacy TPM 1.2-only firmware stacks. | Select for new designs targeting long-term TCG roadmap alignment and enhanced algorithm support-requires firmware update. |
Compared with SLB9670 and NPCT750YAXX, the AT97SC3205T-H3M46-00 provides deterministic I²C-based TPM 1.2 functionality with hardware-managed low-power sleep recovery-ideal for resource-constrained industrial hosts lacking SPI or requiring minimal wake-up latency without host intervention.
Availability
AT97SC3205T-H3M46-00 is available at Aetrix Electronics and suitable for industrial automation controllers, medical diagnostic equipment, and network infrastructure appliances requiring stable component supply, long lifecycle support, and certified cryptographic assurance.
Supply support for AT97SC3205T-H3M46-00 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 belongs to Atmel's Trusted Platform Module family, designed specifically to deliver certified, single-chip TPM 1.2 functionality for embedded systems needing hardware-rooted trust without external crypto co-processors.
FAQ
What interface protocol does the AT97SC3205T-H3M46-00 support?
The AT97SC3205T-H3M46-00 supports only the I²C interface (SM_DAT and SM_CLK pins) at standard (100 kHz) and fast mode (400 kHz) speeds. It does not support SPI, UART, or USB interfaces. The I²C implementation complies fully with TCG TPM 1.2 specification requirements, including address format and command framing. Pull-up resistors must be selected per datasheet guidance (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK) for reliable 400 kHz operation.
Does the AT97SC3205T-H3M46-00 include FIPS-140-2 certification?
Yes, the AT97SC3205T-H3M46-00 is FIPS-140-2 Level 2 certified for its hardware random number generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines. This certification covers the on-die implementations used for TCG protocol functions and is documented in the official Atmel certification report. The certification applies directly to the AT97SC3205T-H3M46-00 device as shipped-not to derivative firmware or host-side implementations.
How is low-power sleep managed on the AT97SC3205T-H3M46-00?
The AT97SC3205T-H3M46-00 enters low-power sleep automatically during idle periods with no host action required. Recovery is triggered exclusively by simultaneous active-low pulses on both TWI_Wakeup# pins (QFN pins 7 and 22). This dual-pin requirement prevents spurious wake-ups. The AT97SC3205T-H3M46-00 does not support wake-up via I²C traffic or interrupt assertion-only the dedicated TWI_Wakeup# mechanism.
What is the purpose of the GPIO-Express-00 pin on the AT97SC3205T-H3M46-00?
The GPIO-Express-00 pin on the AT97SC3205T-H3M46-00 is pre-mapped to TPM_NV_INDEX_GPIO_00 and provides persistent, non-volatile GPIO state storage across reboots. It features an internal pull-up resistor and defaults to input mode. Unlike general-purpose GPIO, it is directly accessible via TCG NV commands-enabling applications to store flags, counters, or status bits that survive power cycles without host firmware intervention.
What package type does the AT97SC3205T-H3M46-00 use?
The AT97SC3205T-H3M46-00 uses the 32-pad Very Thin QFN (VQFN) package (JEDEC MO-220, 32M3 outline), measuring 4.0 × 4.0 × 0.90 mm with 0.40 mm pitch. The exposed thermal pad is internally connected to GND and must be soldered to a PCB GND plane for thermal dissipation and signal integrity. This package replaces the 28-pin TSSOP variant and is identified by the "H3M46" suffix in the full part number.
AT97SC3205T-H3M46-00 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- 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-H3M46-00 FAQ
1.How can I place an order for AT97SC3205T-H3M46-00 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M46-00 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-H3M46-00 reliable?
The price and inventory of AT97SC3205T-H3M46-00 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M46-00 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M46-00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M46-00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M46-00?
AT97SC3205T-H3M46-00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M46-00 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-H3M46-00?
For technical support, including AT97SC3205T-H3M46-00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M46-00 requirements.
6.How does Aetrix verify that AT97SC3205T-H3M46-00 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M46-00 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-H3M46-00 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M46-00?
All AT97SC3205T-H3M46-00 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M46-00, 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-H3M46-00 part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M46-00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M46-00 Tags
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