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Microchip Technology AT97SC3205T-G3M4420B
- Part No.:
- AT97SC3205T-G3M4420B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4420B.pdf
- Description:
- PROD STD COM I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
AT97SC3205T-G3M4420B 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 (400 kHz Fast Mode) and targets secure boot, platform authentication, and key management in embedded systems.
For engineers reviewing the AT97SC3205T-G3M4420B datasheet, AT97SC3205T-G3M4420B pinout, AT97SC3205T-G3M4420B application, or AT97SC3205T-G3M4420B equivalent, this page delivers verified package mapping (32-pad QFN), confirmed I²C timing constraints, validated GPIO-Express-00 and PP/GPIO roles, FIPS-140-2 module certification scope, and low-power sleep recovery via TWI_Wakeup# signaling.
Technical Context
The AT97SC3205T-G3M4420B implements the full TCG TPM 1.2 specification stack in silicon, using an on-die AVR 8-bit RISC CPU to execute firmware-controlled cryptographic primitives. Its hardware crypto engine accelerates RSA key generation and signing, SHA-1 hashing, HMAC-SHA1, and AES encryption without host CPU intervention.
Security enforcement includes physical tamper detection via XTAMPER input, dynamic internal EEPROM key cache management, and mandatory 2μs LRESET# pulse width for deterministic state reset. The device enters low-power sleep autonomously during I²C idle periods and recovers only upon dual active-low TWI_Wakeup# assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables standardized platform attestation and sealed storage across OS and firmware layers. |
| I²C Interface | 400 kHz Fast Mode / 100 kHz Standard Mode - requires 800 Ω pull-up on SM_DAT and 1.5 kΩ on SM_CLK for stable high-speed operation. |
| FIPS Certification | FIPS-140-2 Level 2 certified module - covers RNG, HMAC, AES, SHA, and RSA engines; validates cryptographic integrity for government and regulated systems. |
| Supply Voltage | 3.3 V ±10% - mandates tight decoupling: 2200–4700 pF capacitor <5 mm from each VCC pin and 0.1 μF at VCC node <10 mm from device. |
| NV Storage | 2066 bytes user-defined non-volatile space - allocated in TPM_NV_INDEX address space, accessible via TCG-defined NV write/read commands. |
| Operating Temp | −40°C to +85°C industrial range - qualified for extended thermal cycling in industrial control and networking equipment. |
| Package | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch) - exposes GND center pad internally tied to ground; supports automated optical inspection and reflow compatibility. |
Pinout & Package
AT97SC3205T-G3M4420B uses the 32-pad Very Thin QFN (32M3) package: 4.0 mm × 4.0 mm body, 0.40 mm pitch, exposed GND center pad. Pinout optimized for I²C-based TPM integration with dedicated physical presence (PP/GPIO), tamper sensing (XTAMPER), and low-power wake control (TWI_Wakeup#).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V primary rail; requires localized decoupling per datasheet layout rules to prevent crypto engine timing faults. |
| GND | System ground reference | Includes exposed center pad tied internally to GND - must be soldered for thermal and EMI performance. |
| SM_DAT / SM_CLK | I²C bidirectional data/clock | Compliant with SMBus timing; SM_DAT pull-up ≤800 Ω required for 400 kHz; SM_CLK duty cycle near 50% improves stability. |
| PP/GPIO | Hardware physical presence indicator | Active-high signal indicating authorized firmware update mode; internal pull-down - leave floating if unused. |
| TestBI/GPIO/XTAMPER | Tamper detection input | Configurable as external tamper sensor (active high); also serves as GPIO when XTAMPER disabled per firmware configuration. |
| TWI_Wakeup# | Low-power sleep recovery | Two independent pins (TSSOP pins 7 & 22, QFN pins 7 & 22) - both must be pulsed low to exit deep sleep state. |
| GPIO-Express-00 | Pre-mapped NV index GPIO | Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up - default input mode; used for platform-specific event signaling. |
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-processor coordination and reduces BOM count. |
| FIPS-140-2 Level 2 certification | Covers RNG entropy source, AES-128 encryption, SHA-1 hashing, HMAC-SHA1, and RSA-2048 key operations - satisfies compliance requirements for federal and financial systems. |
| Hardware asymmetric crypto engine | Accelerates RSA key generation (≥1024-bit) and signing in <50 ms - offloads computationally intensive operations from host processor. |
| Internal EEPROM key storage | Dynamically manages multiple RSA keys in protected EEPROM - no host-side key cache management required; secured by TPM_FlushSpecific command. |
| Low-power sleep with wake control | Enters autonomous sleep after I²C inactivity; recovers only upon synchronized TWI_Wakeup# assertion - prevents unintended wake events and extends system standby time. |
Applications
| Secure Boot Authentication | Platform Integrity Verification |
|---|---|
Use Scenario: Verifying firmware signature before loading bootloader in industrial gateways. IC Role / Device Role / Timing Role: TPM performs SHA-1 hash of boot image and validates RSA signature using stored root key - executed before CPU execution begins. Use Value: Prevents unauthorized firmware modification; ensures only cryptographically signed code executes, meeting IEC 62443-3-3 SL2 requirements. | Use Scenario: Measuring BIOS, UEFI, and hypervisor hashes into PCR registers during server power-on self-test. IC Role / Device Role / Timing Role: Acts as trusted measurement anchor - records immutable hashes into Platform Configuration Registers (PCRs) before any software layer loads. Use Value: Enables remote attestation of runtime state; detects rootkit or bootkit injection by comparing PCR values against known-good baselines. |
| Hardware-Based Key Management | Physical Presence Enforcement |
Use Scenario: Storing and protecting TLS private keys for encrypted communication in network appliances. IC Role / Device Role / Timing Role: Generates, stores, and signs with RSA-2048 keys inside shielded EEPROM - private keys never exposed to host memory or bus. Use Value: Mitigates key extraction attacks; meets PCI DSS requirement for cryptographic key protection in payment infrastructure. | Use Scenario: Requiring physical button press before enabling firmware update in medical imaging devices. IC Role / Device Role / Timing Role: PP/GPIO pin monitors mechanical switch state - TPM firmware blocks TPM_PhysicalPresence command unless signal is asserted. Use Value: Enforces human-in-the-loop authorization for privileged operations; satisfies FDA cybersecurity guidance for Class II devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM 1.2 security applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon SLB9665TT2.0 | Same TPM 1.2 compliance, 32-pin QFN, 3.3 V, but uses SPI interface instead of I²C; lacks AVR CPU - relies on host for command parsing. | Requires host driver support for SPI protocol stack; no native GPIO-Express-00 or XTAMPER functionality. | Select when SPI is preferred over I²C and host has sufficient resources to handle TPM command dispatching. |
| Nuvoton NPCT750YAXX | TPM 1.2 compliant, 32-pin QFN, 3.3 V, I²C interface, but uses ARM Cortex-M0 core instead of AVR; FIPS-140-2 Level 1 certified (not Level 2). | Limited RNG and crypto engine validation scope; no certified AES/SHA/RSA acceleration - relies more on firmware. | Select for cost-sensitive designs where full FIPS-140-2 Level 2 certification is not mandated. |
Compared with SLB9665TT2.0 and NPCT750YAXX, the AT97SC3205T-G3M4420B provides integrated AVR CPU for autonomous command execution, FIPS-140-2 Level 2 coverage across all crypto primitives, and dedicated I²C-optimized pinout - making it optimal for resource-constrained hosts requiring certified, self-contained TPM functionality.
Availability
AT97SC3205T-G3M4420B is available at Aetrix Electronics and suitable for secure boot, platform attestation, hardware key storage, and physical presence enforcement requiring stable component supply across industrial, networking, and medical electronics programs.
Supply support for AT97SC3205T-G3M4420B 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-G3M4420B belongs to Atmel's TPM security controller family, designed specifically to deliver certified, single-chip trusted computing capabilities for embedded platforms needing hardware-rooted security without host CPU overhead.
FAQ
What is the I²C clock speed supported by AT97SC3205T-G3M4420B?
The AT97SC3205T-G3M4420B supports I²C Fast Mode up to 400 kHz and Standard Mode at 100 kHz. Stable operation at 400 kHz requires a 1.5 kΩ pull-up resistor on SM_CLK and strict adherence to 50% duty cycle timing. The AT97SC3205T-G3M4420B datasheet specifies these values as validated for reliable communication under industrial temperature conditions.
Does AT97SC3205T-G3M4420B require external EEPROM for key storage?
No, the AT97SC3205T-G3M4420B integrates internal EEPROM specifically for RSA key storage and supports dynamic key caching without host intervention. The AT97SC3205T-G3M4420B uses on-die EEPROM managed by its firmware to store multiple keys securely, eliminating need for external non-volatile memory.
How is physical presence enforced on AT97SC3205T-G3M4420B?
Physical presence is enforced via the PP/GPIO pin, which is an active-high input with internal pull-down. The AT97SC3205T-G3M4420B firmware blocks privileged commands like TPM_PhysicalPresence unless this pin is asserted, ensuring human authorization before critical operations. This behavior is defined in the TCG TPM 1.2 specification and implemented in the AT97SC3205T-G3M4420B's ROM firmware.
What FIPS-140-2 validation level applies to AT97SC3205T-G3M4420B?
The AT97SC3205T-G3M4420B is certified to FIPS-140-2 Level 2, covering its hardware random number generator (RNG), HMAC-SHA1, AES-128, SHA-1, and RSA-2048 engines. This certification was issued under Atmel's module certificate and remains valid post-Microchip acquisition. The AT97SC3205T-G3M4420B documentation references certificate #1752 for full validation scope.
Can AT97SC3205T-G3M4420B enter low-power mode automatically?
Yes, the AT97SC3205T-G3M4420B enters low-power sleep autonomously after I²C inactivity and requires dual active-low pulses on TWI_Wakeup# pins to resume operation. This behavior is hardware-enforced and does not depend on host polling or firmware commands - the AT97SC3205T-G3M4420B handles sleep/wake state transitions independently.
AT97SC3205T-G3M4420B 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
AT97SC3205T-G3M4420B FAQ
1.How can I place an order for AT97SC3205T-G3M4420B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4420B 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-G3M4420B reliable?
The price and inventory of AT97SC3205T-G3M4420B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4420B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4420B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4420B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4420B?
AT97SC3205T-G3M4420B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4420B 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-G3M4420B?
For technical support, including AT97SC3205T-G3M4420B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4420B requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4420B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4420B 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-G3M4420B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4420B?
All AT97SC3205T-G3M4420B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4420B, 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-G3M4420B part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4420B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4420B Tags
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CYPD3175-24LQXQ
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SLB9672VU20FW1523XTMA1
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SLB9670VQ20FW785XTMA1
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CYPD3125-40LQXIT
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AT97SC3204-U2A1A-20
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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