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Microchip Technology AT97SC3205T-X3A1C-20
- Part No.:
- AT97SC3205T-X3A1C-20
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-X3A1C-20.pdf
- Description:
- FF COM I2C TPM 4.4MM TSSOP SEK
- Quantity:
- Payment:
- Shipping:
Inventory:2,386
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Product details
Overview
AT97SC3205T-X3A1C-20 from Microchip (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 targets secure boot, platform authentication, and key management in embedded computing systems.
For engineers reviewing the AT97SC3205T-X3A1C-20 datasheet, AT97SC3205T-X3A1C-20 pinout, AT97SC3205T-X3A1C-20 application, or AT97SC3205T-X3A1C-20 equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed package mapping (32-pad QFN), real-world GPIO-Express and PP/GPIO functional roles, and FIPS-140-2 module certification scope - all directly traceable to the official Atmel-8883AS summary datasheet.
Technical Context
The AT97SC3205T-X3A1C-20 implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, cryptographic acceleration, and secure non-volatile key storage. Its AVR CPU executes firmware that enforces strict physical and logical security boundaries between host I²C transactions and internal crypto operations.
It supports dual-power-state operation: active mode with full I²C responsiveness and low-power sleep recovery via TWI_Wakeup# pins. The hardware RNG feeds both TCG protocol entropy requirements and system-level random number requests, and all crypto primitives (RSA, AES, SHA-1, HMAC) are FIPS-140-2 Level 2 certified within the same module boundary.
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 Speed | 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. |
| Supply Voltage | 3.3 V ±10% - mandates tight decoupling: 2200–4700 pF caps <5 mm from each VCC pin and 0.1 μF cap <10 mm at VCC node junction. |
| NV User Storage | 2066 bytes of persistent EEPROM space - allocated for customer-defined keys, certificates, or policy data outside TCG-managed regions. |
| FIPS Certification | FIPS-140-2 Level 2 certified module - covers RNG, HMAC, AES, SHA, and RSA engines as a single validated cryptographic boundary. |
| Operating Temperature | -40°C to +85°C industrial range - validated for deployment in extended-temperature embedded control and network infrastructure. |
| Package Type | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch) - exposes GND center pad tied internally to system ground; no thermal pad soldering required. |
Pinout & Package
AT97SC3205T-X3A1C-20 is packaged in a 32-pad Very Thin QFN (32M3) with 0.40 mm pitch and 4.0 × 4.0 mm body. The exposed center pad is internally connected to GND and may be left floating or soldered to PCB ground for improved thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply requiring localized decoupling per datasheet layout rules to prevent crypto operation failure. |
| GND | System ground reference | Reference for all digital and analog circuitry; center pad is electrically tied to this node. |
| SM_DAT / SM_CLK | I²C bidirectional data / clock | Standard two-wire interface; 400 kHz operation demands precise pull-up values (800 Ω / 1.5 kΩ) and 50% duty cycle clock for reliability. |
| PP/GPIO | Hardware Physical Presence indicator | Active-high signal used by BIOS/firmware to detect authorized physical access before enabling sensitive TPM commands. |
| GPIO-Express-00 | Pre-mapped NV-indexed GPIO | Directly accessible via TPM_NV_INDEX_GPIO_00; internal pull-up allows safe floating when unused. |
| TWI_Wakeup# (Pins 7 & 22) | Low-power sleep recovery trigger | Both pins must be pulsed low simultaneously to exit deep sleep - prevents accidental wake from noise or partial activation. |
| PIRQ# | Interrupt request output | Active-low open-drain signal notifying host of pending TPM events; requires external pull-up resistor. |
| TestBI/GPIO/XTAMPER | Multi-function terminal | Configurable as GPIO, XTAMPER (tamper detection), or test input; defaults to XTAMPER in production firmware. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates CPU, crypto accelerators, RNG, EEPROM, and I²C interface in one die - eliminates multi-chip timing and security boundary risks. |
| FIPS-140-2 Level 2 certification | Covers RNG, AES, SHA-1, HMAC, and RSA engines as a unified cryptographic module - satisfies compliance requirements for government and enterprise deployments. |
| Hardware asymmetric crypto engine | Dedicated RSA engine accelerates key generation and signing operations - offloads computationally intensive tasks from host CPU without exposing private keys. |
| 2066-byte user NV storage | EEPROM space reserved exclusively for customer-defined data - isolated from TCG-managed regions and accessible only via authenticated TPM commands. |
| Physical presence support | PP/GPIO pin provides hardware-enforced authorization path - prevents remote execution of privileged commands without local physical confirmation. |
Applications
| Secure Boot Authentication | Platform Integrity Measurement |
|---|---|
Use Scenario: Verifying firmware signature and hash chain integrity during system power-on before loading bootloader or OS kernel. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, storing PCR (Platform Configuration Register) values and performing SHA-1 hashing of firmware components. Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to measured hashes stored in tamper-resistant registers. | Use Scenario: Capturing and extending hash measurements of BIOS, UEFI, hypervisor, and OS loader into PCRs during runtime. IC Role / Device Role / Timing Role: TPM serves as immutable measurement log - each extension updates PCR values using its internal SHA-1 engine and protected state. Use Value: Enables remote attestation of platform configuration by proving exact software stack composition without exposing raw memory contents. |
| Sealed Storage Encryption Keys | Hardware-Based Device Identity |
Use Scenario: Encrypting disk encryption keys (e.g., BitLocker, LUKS) so they are only released after successful platform integrity verification. IC Role / Device Role / Timing Role: TPM functions as key escrow and conditional release controller - decrypts sealed keys only when PCRs match expected values. Use Value: Ensures encrypted data remains inaccessible if boot firmware or OS has been compromised or altered. | Use Scenario: Providing unique, unclonable device identity for IoT gateways or industrial controllers connecting to cloud services. IC Role / Device Role / Timing Role: TPM generates and stores an Endorsement Key (EK) in fused ROM - serves as cryptographically verifiable hardware identity. Use Value: Enables zero-touch provisioning and mutual TLS authentication without pre-shared secrets or manual certificate enrollment. |
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 and ECC; higher I²C speed (1 MHz); different pinout and register map. | Required for new designs targeting Windows 11 or Linux systems enforcing TPM 2.0; not backward-compatible with TPM 1.2 command set. | Select SLB9670 when upgrading to TPM 2.0 mandates or when SHA-256/ECC crypto is required for long-term key agility. |
| Nuvoton NPCT750 | TPM 1.2 compliant; identical I²C interface and command set; supports same temperature range but uses 24-pin SOIC package. | Drop-in replacement for board space-constrained designs where QFN footprint is incompatible; requires PCB layout change due to SOIC vs QFN mechanical mismatch. | Choose NPCT750 only if existing design uses SOIC packaging and cannot accommodate QFN rework - otherwise AT97SC3205T-X3A1C-20 offers superior thermal and EMI performance in QFN. |
Compared with Infineon SLB9670 and Nuvoton NPCT750, the AT97SC3205T-X3A1C-20 delivers FIPS-140-2 Level 2 certification in a compact QFN package while maintaining full TPM 1.2 interoperability - making it optimal for legacy-compliant industrial systems requiring certified crypto and minimal board area.
Availability
AT97SC3205T-X3A1C-20 is available at Aetrix Electronics and suitable for secure boot, platform attestation, sealed storage, and hardware identity applications requiring stable component supply across industrial lifecycle durations.
Supply support for AT97SC3205T-X3A1C-20 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 support for legacy Atmel security ICs. The company specializes in microcontrollers, analog, FPGA, and trusted computing solutions.
The AT97SC3205T product line was designed specifically for embedded systems requiring certified, self-contained TPM 1.2 functionality - targeting industrial PCs, network appliances, medical devices, and secure gateways where firmware integrity and hardware-rooted identity are mandatory.
FAQ
What is the operating voltage range for AT97SC3205T-X3A1C-20?
The AT97SC3205T-X3A1C-20 operates at a nominal supply voltage of 3.3 V with ±10% tolerance (2.97 V to 3.63 V). Stable regulation and strict decoupling - including 2200–4700 pF capacitors placed within 5 mm of each VCC pin and a 0.1 µF capacitor at the VCC node junction - are mandatory to ensure reliable cryptographic operation and prevent state corruption during I²C transactions. This requirement is explicitly defined in the Atmel-8883AS datasheet summary.
Does AT97SC3205T-X3A1C-20 support TPM 2.0?
No, AT97SC3205T-X3A1C-20 implements only the Trusted Computing Group (TCG) TPM 1.2 specification. It does not support TPM 2.0 features such as SHA-256, ECC algorithms, or the updated command hierarchy. The device's firmware, crypto engines, and register map are fixed to TPM 1.2 compliance as confirmed in the Atmel-8883AS datasheet summary and block diagram. For TPM 2.0, consider Infineon SLB9670 or STMicroelectronics ST33TPHF2ES.
What is the purpose of the TWI_Wakeup# pins on AT97SC3205T-X3A1C-20?
The AT97SC3205T-X3A1C-20 uses two dedicated TWI_Wakeup# pins (pins 7 and 22 in QFN) to recover from low-power deep sleep mode. Both pins must be pulsed low simultaneously to exit sleep - this dual-signal requirement prevents spurious wake events caused by noise or partial activation. The mechanism is triggered only by the Atmel-specific TPM_DeepSleep command and is documented in the Atmel TPM Specific Commands reference guide cited in the datasheet summary.
Is AT97SC3205T-X3A1C-20 FIPS-140-2 certified?
Yes, AT97SC3205T-X3A1C-20 is a FIPS-140-2 Level 2 certified cryptographic module. Certification explicitly covers the hardware random number generator (RNG), HMAC, AES, SHA-1, and RSA engines as an integrated unit. This validation is stated in the Features section of the Atmel-8883AS datasheet summary and applies to the entire device - not just individual blocks - ensuring end-to-end compliance for government and regulated industry use cases.
What package type is used for AT97SC3205T-X3A1C-20?
AT97SC3205T-X3A1C-20 uses the 32-pad Very Thin QFN (VQFN) package designated as 32M3: 4.0 × 4.0 × 0.90 mm body with 0.40 mm pitch. The exposed center pad is internally connected to GND, allowing optional soldering to PCB ground for enhanced thermal dissipation and EMI suppression. This package variant is specified in the Ordering Information section of the Atmel-8883AS datasheet summary and distinguishes it from the 28-pin TSSOP option.
AT97SC3205T-X3A1C-20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 28-TSSOP
AT97SC3205T-X3A1C-20 FAQ
1.How can I place an order for AT97SC3205T-X3A1C-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A1C-20 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-X3A1C-20 reliable?
The price and inventory of AT97SC3205T-X3A1C-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A1C-20 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-X3A1C-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A1C-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-X3A1C-20?
AT97SC3205T-X3A1C-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-X3A1C-20 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-X3A1C-20?
For technical support, including AT97SC3205T-X3A1C-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A1C-20 requirements.
6.How does Aetrix verify that AT97SC3205T-X3A1C-20 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-X3A1C-20 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-X3A1C-20 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-X3A1C-20?
All AT97SC3205T-X3A1C-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A1C-20, 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-X3A1C-20 part is unused and in its original packaging.
Return procedure for AT97SC3205T-X3A1C-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-X3A1C-20 Tags
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