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Microchip Technology AT97SC3205T-G3M4C00B
- Part No.:
- AT97SC3205T-G3M4C00B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4C00B.pdf
- Description:
- PROD FF COM I2C TPM 4X4 32VQFN C
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
AT97SC3205T-G3M4C00B from Microchip (acquired 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-G3M4C00B datasheet, AT97SC3205T-G3M4C00B pinout, AT97SC3205T-G3M4C00B application, or AT97SC3205T-G3M4C00B equivalent, this page delivers verified package mapping (32-pad QFN), confirmed I²C timing constraints, GPIO-Express-00 and PP/GPIO roles, TWI_Wakeup# deep-sleep recovery behavior, and FIPS-140-2 module certification scope - all critical for secure firmware integration and layout validation.
Technical Context
The AT97SC3205T-G3M4C00B implements the full TCG TPM 1.2 specification stack in silicon, using an on-die AVR 8-bit RISC CPU to execute TPM command dispatch, cryptographic state machine control, and NV memory management without host intervention. Its hardware crypto engine offloads RSA key generation (2048-bit), SHA-1 hashing, HMAC signing, and AES encryption directly in dedicated logic.
Security isolation is enforced via physical tamper detection circuitry, internal EEPROM for RSA key storage, and dynamic memory management for key cache retention. The device supports low-power sleep mode activated by TPM_DeepSleep command and recovered only upon simultaneous active-low assertion of TWI_Wakeup# pins (TSSOP pin 7 & QFN pin 22), ensuring controlled wake-up integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables interoperable trusted boot, attestation, and sealed storage across Windows/Linux platforms. |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC, AES-128, SHA-1, and RSA-2048 - provides NIST-validated primitives for key derivation, signature, and encryption. |
| I²C Interface | 400kHz Fast Mode / 100kHz Standard Mode - requires 800Ω pull-up on SM_DAT and 1.5kΩ on SM_CLK for stable high-speed operation. |
| Supply Voltage | 3.3V ±10% - mandates tight decoupling: 2200–4700pF caps <5mm from each VCC–GND pair plus 0.1μF at VCC node <10mm from device. |
| NV Storage | 2066 bytes user-defined data space - persistent storage for credentials, certificates, or policy objects independent of host power cycle. |
| Operating Temp | −40°C to +85°C industrial range - qualified for deployment in network infrastructure, industrial controllers, and edge gateways. |
| Package | 32-pad QFN (4.0×4.0×0.90 mm, 0.40 mm pitch) - exposes GND center pad tied internally to system ground; supports automated reflow assembly. |
Pinout & Package
AT97SC3205T-G3M4C00B is packaged in a 32-pad Very Thin QFN (32M3) with 0.40 mm pitch and exposed GND thermal pad. Pin assignments are defined per Atmel-8883AS-TPM-AT97SC3205T-Datasheet-Summary_022014, Table 1-2 and Figure 1-1 (QFN variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply; requires localized decoupling capacitors within 5 mm of each VCC–GND pair. |
| GND | System ground reference | Multiple GND pins including center thermal pad (internally tied to GND); essential for noise immunity and thermal dissipation. |
| SM_DAT / SM_CLK | I²C bidirectional data / clock | 400kHz-capable interface; pull-up values (800Ω/1.5kΩ) validated for signal integrity at max speed. |
| PP/GPIO | Hardware Physical Presence indicator | Active-high GPIO with internal pull-down; used to assert physical presence during TPM authorization sequences. |
| GPIO-Express-00 | Dedicated NV-mapped GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up enables floating-if-unused design; supports XOR chain output in test mode. |
| TWI_Wakeup# (pins 7 & 22) | Deep-sleep recovery trigger | Both pins must be pulsed low simultaneously to exit TPM_DeepSleep state - prevents spurious wake events. |
| PIRQ# | SPI interrupt request output | Active-low interrupt signal asserted by TPM to notify host of command completion or error condition. |
| NC (pins 7,10,11,13–16,25–28,31) | No-connect terminals | May be left floating, tied to GND, or tied to VCC at designer's discretion; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates CPU, crypto engines, RNG, EEPROM, and I²C interface in one die - eliminates external co-processors and reduces BOM count. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies U.S. federal and enterprise security procurement requirements. |
| Hardware-based key protection | RSA private keys stored exclusively in internal EEPROM with no software-accessible path - prevents extraction via memory dump or debug interface. |
| Low-power deep-sleep mode | TPM_DeepSleep command reduces current draw significantly; recovery requires dual-pin TWI_Wakeup# handshake - prevents unauthorized wake-up. |
| GPIO-Express architecture | Pre-mapped NV index (TPM_NV_INDEX_GPIO_00) enables deterministic, non-volatile GPIO state retention across power cycles. |
Applications
| Secure Boot Authentication | Platform Integrity Attestation |
|---|---|
Use Scenario: Verifying firmware image authenticity before loading into main processor memory during cold boot sequence. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; measures BIOS/UEFI hash into Platform Configuration Registers (PCRs) and signs result with embedded RSA key. Use Value: Prevents execution of tampered or unsigned firmware - enforces chain-of-trust from hardware reset vector through OS loader. | Use Scenario: Reporting runtime system state (e.g., running processes, driver signatures) to remote verifier for compliance audit. IC Role / Device Role / Timing Role: TPM generates signed PCR quotes using SHA-1 and RSA-2048; validates host-provided nonce to prevent replay attacks. Use Value: Enables zero-trust verification of endpoint health without exposing sensitive keys or internal state to host software. |
| Sealed Data Storage | Hardware Physical Presence Control |
Use Scenario: Encrypting disk encryption keys so they decrypt only when platform configuration matches pre-recorded PCR values. IC Role / Device Role / Timing Role: TPM performs AES-128 encryption/decryption of wrapped keys using PCR-bound policies; stores ciphertext in 2066-byte NV space. Use Value: Ensures encrypted storage remains inaccessible after unauthorized firmware modification or OS reinstallation. | Use Scenario: Requiring physical button press or jumper setting before enabling privileged TPM operations (e.g., clearing owner authorization). IC Role / Device Role / Timing Role: PP/GPIO pin detects hardware-level presence assertion; TPM firmware gates sensitive commands until pin reads high. Use Value: Mitigates remote privilege escalation by enforcing out-of-band human confirmation for destructive security actions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM security applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9670 | TPM 2.0 compliant; supports SHA-256, ECC, and larger NV space (3.5 kB); uses SPI interface instead of I²C. | Required for Windows 11 and newer Linux distros mandating TPM 2.0; incompatible with legacy TPM 1.2-only stacks. | Select SLB9670 when upgrading to modern OS security requirements or needing ECC-based key agility. |
| Nuvoton NPCT750YAXX | TPM 2.0 device with integrated ARM Cortex-M0+; supports both I²C and SPI; includes enhanced side-channel resistance features. | Better suited for new designs targeting long-term lifecycle support and advanced threat models; lacks direct TPM 1.2 backward compatibility. | Choose NPCT750YAXX for greenfield embedded projects requiring future-proofing and extended security certifications. |
Compared with AT97SC3205T-G3M4C00B, SLB9670 and NPCT750YAXX offer TPM 2.0 functionality but require firmware and driver updates; AT97SC3205T-G3M4C00B remains optimal for maintaining legacy TPM 1.2 deployments where certification continuity and minimal software change are critical.
Availability
AT97SC3205T-G3M4C00B is available at Aetrix Electronics and suitable for secure boot, platform attestation, sealed storage, and hardware physical presence control applications requiring stable component supply and long-term industrial temperature support.
Supply support for AT97SC3205T-G3M4C00B 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 security IC portfolio, delivering robust, certified solutions for embedded trust and cryptographic acceleration.
The AT97SC3205T-G3M4C00B belongs to Atmel's TPM product line, designed specifically to embed hardware-rooted security into resource-constrained embedded systems without requiring external secure elements or complex software stacks.
FAQ
What is the primary security certification applicable to the AT97SC3205T-G3M4C00B?
The AT97SC3205T-G3M4C00B is FIPS-140-2 Level 2 certified for its RNG, HMAC, AES, SHA, and RSA engines - validating cryptographic algorithm correctness, key management, and physical security mechanisms. This certification covers the entire module, not just individual components, and is documented in the official Atmel certification report referenced in the datasheet summary. AT97SC3205T-G3M4C00B meets U.S. federal and enterprise procurement requirements for trusted computing modules.
Does the AT97SC3205T-G3M4C00B support both commercial and industrial temperature ranges?
Yes, the AT97SC3205T-G3M4C00B is qualified for industrial operation from −40°C to +85°C, as specified in the ordering information section of the datasheet summary. While the base part number AT97SC3205T supports both commercial (0°C to 70°C) and industrial grades, the suffix "G3M4C00B" explicitly denotes the industrial-grade 32-pad QFN variant. AT97SC3205T-G3M4C00B ensures reliable performance in harsh environments such as network infrastructure and industrial control panels.
How does the AT97SC3205T-G3M4C00B handle low-power states and wake-up recovery?
The AT97SC3205T-G3M4C00B enters low-power sleep automatically when idle and supports deep-sleep mode via the TPM_DeepSleep command. Recovery requires simultaneous active-low pulses on two dedicated TWI_Wakeup# pins (QFN pins 7 and 22) - a hardware-enforced dual-signal handshake that prevents accidental or malicious wake-up. AT97SC3205T-G3M4C00B does not rely on I²C traffic alone for wake-up, enhancing system-level power control integrity.
What are the I²C interface requirements for reliable 400kHz operation with the AT97SC3205T-G3M4C00B?
For stable 400kHz Fast Mode I²C operation, the AT97SC3205T-G3M4C00B requires an 800Ω pull-up resistor on SM_DAT and a 1.5kΩ pull-up on SM_CLK, as validated in the datasheet summary. Signal integrity further improves with a near-50% duty cycle on SM_CLK. AT97SC3205T-G3M4C00B also mandates strict decoupling: 2200–4700pF capacitors placed <5 mm between each VCC–GND pair, plus a 0.1μF capacitor at the VCC node <10 mm from the device.
Can the GPIO-Express-00 pin on the AT97SC3205T-G3M4C00B retain state across power cycles?
Yes, the GPIO-Express-00 pin on the AT97SC3205T-G3M4C00B maps to TPM_NV_INDEX_GPIO_00 - a non-volatile index in the device's 2066-byte user NV storage. This allows firmware to write and read GPIO state persistently, surviving full power cycles and resets. AT97SC3205T-G3M4C00B leverages internal EEPROM to store this value, eliminating dependency on host-side backup mechanisms and ensuring deterministic behavior after cold start.
AT97SC3205T-G3M4C00B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- 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-G3M4C00B FAQ
1.How can I place an order for AT97SC3205T-G3M4C00B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4C00B 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-G3M4C00B reliable?
The price and inventory of AT97SC3205T-G3M4C00B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4C00B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4C00B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4C00B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4C00B?
AT97SC3205T-G3M4C00B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4C00B 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-G3M4C00B?
For technical support, including AT97SC3205T-G3M4C00B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4C00B requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4C00B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4C00B 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-G3M4C00B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4C00B?
All AT97SC3205T-G3M4C00B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4C00B, 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-G3M4C00B part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4C00B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4C00B Tags
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CYPD3175-24LQXQ
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SLB9670VQ20FW785XTMA1
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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