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Microchip Technology AT97SC3205T-G3M4B20B
- Part No.:
- AT97SC3205T-G3M4B20B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4B20B.pdf
- Description:
- PROD STD COM I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,766
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Product details
Overview
AT97SC3205T-G3M4B20B from Microchip (acquired 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 400kHz and supports industrial temperature range (−40°C to +85°C) in 32-pad QFN package.
For engineers reviewing the AT97SC3205T-G3M4B20B datasheet, AT97SC3205T-G3M4B20B pinout, AT97SC3205T-G3M4B20B application, or AT97SC3205T-G3M4B20B equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed TPM 1.2 compliance, exact pin roles for GPIO-Express-00 and PP/GPIO, and real-world low-power wake-up behavior using TWI_Wakeup#.
Technical Context
The AT97SC3205T-G3M4B20B implements the full TCG TPM 1.2 specification via on-die AVR CPU executing firmware with secure boot and dynamic key cache management. Its crypto subsystem includes dedicated hardware accelerators for RSA, SHA-1, HMAC-SHA1, and AES-128, all FIPS-140-2 Level 2 certified.
Communication occurs exclusively over I²C (SM_DAT/SM_CLK) with strict timing requirements: 400kHz Fast Mode supported only with 800Ω pull-up on SM_DAT and 1.5kΩ on SM_CLK, and 50% duty cycle on SM_CLK required for stable high-speed operation. Low-power sleep recovery requires dual active-low pulses on TWI_Wakeup# pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Fully implements TPM 1.2 specification including command set, platform hierarchy, and physical presence protocols. |
| I²C Interface Speed | 400kHz Fast Mode or 100kHz Standard Mode; requires specific pull-up values (800Ω/1.5kΩ) and 50% SM_CLK duty cycle for reliable 400kHz operation. |
| Crypto Engines | Hardware-accelerated RSA (1024/2048-bit), SHA-1, HMAC-SHA1, AES-128, and FIPS-140-2 certified RNG. |
| NV Storage | 2066 bytes of user-defined non-volatile storage accessible via TPM_NV_Write/Read commands. |
| Supply Voltage | 3.3V ±10%; requires local decoupling: 2200–4700pF capacitor <5mm from each VCC pin and 0.1μF capacitor <10mm at VCC node junction. |
| Operating Temperature | Industrial grade: −40°C to +85°C; validated across full range for cryptographic operation and NV write endurance. |
| Package | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch); center thermal pad internally tied to GND. |
Pinout & Package
AT97SC3205T-G3M4B20B uses a 32-pad Very Thin QFN (32M3) package with 0.40 mm pitch and exposed thermal pad tied to GND. Pinout is identical to the AT97SC3205T QFN variant per Atmel-8883AS datasheet summary.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires dedicated decoupling capacitors placed within 5 mm of each VCC pin and 10 mm at VCC node junction. |
| GND | Ground reference | System ground; center thermal pad is internally connected to GND and must be soldered or left floating per layout guidelines. |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data; requires 800Ω pull-up for stable 400kHz operation; supports TCG TPM 1.2 command/response framing. |
| SM_CLK | I²C clock input | Requires 1.5kΩ pull-up and 50% duty cycle for reliable 400kHz timing; deviation causes communication failure or CRC errors. |
| PP/GPIO | Physical Presence indicator / GPIO | Active-high hardware physical presence signal; internal pull-down; floats high when asserted; used for TPM owner authorization. |
| GPIO-Express-00 | TPM NV-indexed GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up; serves as XOR chain output during I/O test mode; defaults to input. |
| TWI_Wakeup# | Low-power sleep recovery | Two independent active-low pins (pins 7 & 22); both must be pulsed low to exit deep sleep state initiated by TPM_DeepSleep command. |
| PIRQ# | Interrupt request output | Open-drain interrupt signal asserted by TPM to host processor; requires external pull-up; indicates pending event or command completion. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates AVR CPU, crypto engines, EEPROM, RNG, 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 and regulated environments requiring validated cryptographic modules. |
| Hardware asymmetric crypto engine | Accelerates RSA key generation and signing operations offloading host CPU; supports 1024-bit and 2048-bit keys with constant-time execution. |
| Secure firmware and layout | Includes tamper detection circuitry, secure boot ROM, and physically hardened layout to resist side-channel and fault injection attacks. |
| Dynamic key cache management | Automatically manages multiple loaded RSA keys in SRAM without host intervention beyond standard TPM_FlushSpecific/TPM_LoadKey2 commands. |
Applications
| Server Platform Security | Industrial Control System Authentication |
|---|---|
Use Scenario: Secure boot and remote attestation in x86/ARM server motherboards. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust enforcing measured boot chain integrity and generating signed quotes for verification. Use Value: Enables hardware-backed identity binding and prevents unauthorized firmware modification using FIPS-certified RSA and SHA-1 engines. | Use Scenario: Secure firmware update and device identity provisioning in PLCs and HMIs operating in harsh industrial environments. IC Role / Device Role / Timing Role: Cryptographic anchor for secure OTA updates and mutual authentication between controller and field devices. Use Value: Provides −40°C to +85°C operational reliability with tamper-resistant key storage and hardware-accelerated AES-128 decryption. |
| Medical Device Data Integrity | Embedded Linux Device Identity |
Use Scenario: HIPAA-compliant audit log signing and encrypted patient data sealing in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Secure NV storage for cryptographic keys and audit logs; generates HMAC-SHA1 signatures for log integrity verification. Use Value: Meets FDA cybersecurity guidance via FIPS-140-2 certified RNG and HMAC engines, ensuring non-repudiation of critical system events. | Use Scenario: Hardware-enforced device identity and secure credential storage in network-attached storage (NAS) and edge gateways. IC Role / Device Role / Timing Role: TPM-resident key vault for SSH keys, TLS certificates, and disk encryption keys managed by Linux kernel tpm_tis driver. Use Value: Prevents credential theft via physical extraction using on-die EEPROM and secure boot enforcement-no software-only fallback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM security module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST33TPHF2XSS | TPM 2.0 compliant; supports SHA-256 and ECC; 3.3V I²C; 32-pin QFN but different pinout and power sequencing. | Required for new designs targeting Windows 11 or Linux systems mandating TPM 2.0; not backward-compatible with TPM 1.2 command set. | Select ST33TPHF2XSS when upgrading to TPM 2.0 is mandatory; AT97SC3205T-G3M4B20B remains optimal for legacy TPM 1.2 deployments with existing firmware. |
| SLB9670 | TPM 2.0 compliant; supports RSA/ECC/SHA-256; 3.3V SPI/I²C; 32-pin QFN with distinct pin mapping and no TWI_Wakeup# functionality. | Offers SPI interface option and extended lifecycle support; lacks dedicated low-power wake-up pins, requiring host-managed sleep states. | Choose SLB9670 for SPI-based host integration or long-term availability planning; AT97SC3205T-G3M4B20B is preferred where I²C-only, low-power wake-up, and TPM 1.2 compliance are fixed requirements. |
Compared with ST33TPHF2XSS and SLB9670, the AT97SC3205T-G3M4B20B provides verified TPM 1.2 compliance, integrated TWI_Wakeup# for autonomous low-power recovery, and FIPS-140-2 certification covering its full crypto stack-making it uniquely suited for industrial and medical systems locked to TPM 1.2 firmware stacks.
Availability
AT97SC3205T-G3M4B20B is available at Aetrix Electronics and suitable for server platform security, industrial control system authentication, and medical device data integrity applications requiring stable component supply and long-term lifecycle assurance.
Supply support for AT97SC3205T-G3M4B20B 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-G3M4B20B 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 is the primary compliance standard met by the AT97SC3205T-G3M4B20B?
The AT97SC3205T-G3M4B20B is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification. It implements the complete command set, platform hierarchy, and physical presence protocols defined in that standard. This compliance is verified through functional testing against TCG test suites and documented in the Atmel-8883AS datasheet summary. The AT97SC3205T-G3M4B20B does not support TPM 2.0 features such as SHA-256 or ECC.
Does the AT97SC3205T-G3M4B20B support both I²C Fast Mode and Standard Mode?
Yes, the AT97SC3205T-G3M4B20B supports I²C Standard Mode (100kHz) and Fast Mode (400kHz). However, reliable 400kHz operation requires precise external component selection: an 800Ω pull-up resistor on SM_DAT and a 1.5kΩ pull-up on SM_CLK, plus a 50% duty cycle on the SM_CLK signal. Deviations cause communication timeouts or CRC errors. The AT97SC3205T-G3M4B20B does not support High-Speed I²C mode.
How is low-power sleep recovery implemented on the AT97SC3205T-G3M4B20B?
Low-power sleep recovery on the AT97SC3205T-G3M4B20B is implemented using two dedicated pins: TWI_Wakeup# (pin 7) and TWI_Wakeup# (pin 22). Both pins must be pulsed active-low simultaneously to exit the deep sleep state entered via the TPM_DeepSleep command. This dual-signal requirement prevents spurious wake-ups. If unused, pin 7 may float or tie to GND; pin 22 must tie to GND or VCC. The AT97SC3205T-G3M4B20B does not support single-pin wake-up or automatic wake-on-I²C activity.
What cryptographic algorithms are hardware-accelerated in the AT97SC3205T-G3M4B20B?
The AT97SC3205T-G3M4B20B includes dedicated hardware accelerators for RSA (1024-bit and 2048-bit), SHA-1, HMAC-SHA1, AES-128, and a FIPS-140-2 certified Pseudo Random Number Generator (RNG). These engines are validated under FIPS-140-2 Level 2 certification. The AT97SC3205T-G3M4B20B does not accelerate SHA-256, ECC, or AES-256-those require TPM 2.0 devices like ST33TPHF2XSS.
What is the purpose of the PP/GPIO pin on the AT97SC3205T-G3M4B20B?
The PP/GPIO pin on the AT97SC3205T-G3M4B20B serves as the Hardware Physical Presence indicator, active-high, with an internal pull-down resistor. It signals to the TPM that a human operator has authorized sensitive operations (e.g., clearing ownership or enabling dictionary attack protection). When asserted, it satisfies TCG's physical presence requirement. In unused configurations, it should be left floating due to the internal pull-down. The AT97SC3205T-G3M4B20B does not repurpose this pin for general-purpose functions without explicit firmware reconfiguration.
AT97SC3205T-G3M4B20B 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
AT97SC3205T-G3M4B20B FAQ
1.How can I place an order for AT97SC3205T-G3M4B20B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4B20B 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-G3M4B20B reliable?
The price and inventory of AT97SC3205T-G3M4B20B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4B20B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4B20B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4B20B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4B20B?
AT97SC3205T-G3M4B20B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4B20B 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-G3M4B20B?
For technical support, including AT97SC3205T-G3M4B20B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4B20B requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4B20B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4B20B 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-G3M4B20B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4B20B?
All AT97SC3205T-G3M4B20B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4B20B, 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-G3M4B20B part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4B20B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4B20B Tags
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CYPD3175-24LQXQ
Infineon Technologies
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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
Infineon Technologies
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SLB9672XU20FW1613XTMA1
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SLB9672AU20FW1613XTMA1
Infineon Technologies
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SLB9673AU20FW2613XTMA1
Infineon Technologies
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