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Microchip Technology AT97SC3205T-X3A1610B
- Part No.:
- AT97SC3205T-X3A1610B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-X3A1610B.pdf
- Description:
- MEM FF IND I2C TPM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,314
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Product details
Overview
AT97SC3205T-X3A1610B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring 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 up to 400 kHz and supports industrial temperature range (−40°C to +85°C).
For engineers reviewing the AT97SC3205T-X3A1610B datasheet, AT97SC3205T-X3A1610B pinout, AT97SC3205T-X3A1610B application, or AT97SC3205T-X3A1610B equivalent, this page delivers verified package mapping (32-pin QFN), confirmed I²C timing constraints, GPIO-Express-00 and PP/GPIO functional roles, low-power TWI_Wakeup# recovery behavior, and FIPS-140-2 module certification scope.
Technical Context
The AT97SC3205T-X3A1610B integrates a dedicated AVR 8-bit RISC CPU with on-chip EEPROM for RSA key storage and SRAM for runtime operations. Its crypto subsystem includes independent hardware engines for RSA, AES, SHA, and HMAC-all validated under FIPS-140-2 Level 2 certification, including the RNG.
Communication occurs exclusively via I²C (SM_DAT/SM_CLK), supporting 100 kHz standard mode and 400 kHz fast mode with strict pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK). The device enters low-power sleep autonomously and recovers only upon dual active-low assertion of TWI_Wakeup# pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification compliant; enables secure boot, remote attestation, and sealed storage in PC/embedded platforms. |
| I²C Interface Speed | Up to 400 kHz fast mode; requires precise pull-up values (800 Ω SM_DAT, 1.5 kΩ SM_CLK) and 50% duty cycle clock for stable communication. |
| Supply Voltage | 3.3 V nominal; mandates decoupling with 2200–4700 pF capacitors within 5 mm of each VCC pin and 0.1 µF at VCC node. |
| FIPS Certification | FIPS-140-2 Level 2 certified module covering RNG, HMAC, AES, SHA, and RSA engines-validates cryptographic integrity for government/compliance use. |
| NV Storage Capacity | 2066 bytes of user-defined non-volatile storage accessible via TPM_NV_Write/TPM_NV_Read commands. |
| Operating Temperature | −40°C to +85°C industrial grade; qualified for extended thermal cycling in embedded control and network infrastructure. |
| Package Options | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch); center thermal pad internally tied to GND. |
Pinout & Package
AT97SC3205T-X3A1610B is packaged in a 32-pad Very Thin QFN (32M3) with 0.40 mm pitch, 4.0 × 4.0 mm body, and exposed thermal pad tied to GND. Pinout matches the 32-pin QFN variant described in Atmel-8883AS, with no-connect (NC) pins at positions 7, 10–11, 13–16, 25–28, 31.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires localized 2200–4700 pF decoupling ≤5 mm from each VCC pin and global 0.1 µF bypass ≤10 mm from device. |
| GND | Ground reference | System ground; substrate center pad is internally connected to GND and may be left floating or soldered to PCB ground plane. |
| SM_DAT / SM_CLK | I²C bidirectional data/clock | Interface to host controller; supports 100/400 kHz modes; SM_DAT pull-up = 800 Ω, SM_CLK pull-up = 1.5 kΩ for reliable 400 kHz operation. |
| GPIO-Express-00 | Dedicated NV-indexed GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up enabled; floats high when unused; used for platform-specific signaling or status reporting. |
| PP/GPIO | Physical presence indicator | Hardware physical presence signal (active-high); internal pull-down; indicates authorized firmware update or configuration change initiation. |
| TWI_Wakeup# (pins 7 & 22) | Low-power recovery trigger | Both pins must be pulsed low simultaneously to exit deep-sleep state initiated by TPM_DeepSleep command. |
| PIRQ# | Interrupt request output | Active-low interrupt to host processor signaling pending TPM event (e.g., command completion, error condition); requires 4.7 kΩ pull-down if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 implementation | Eliminates external crypto co-processor and key storage ICs; reduces BOM count and board area in server, industrial PC, and edge gateway designs. |
| FIPS-140-2 Level 2 certified crypto engines | Validates RNG entropy quality, AES/SHA/HMAC algorithm correctness, and RSA key generation integrity-required for U.S. federal and regulated industry deployments. |
| Internal EEPROM for RSA keys | Securely stores multiple asymmetric key pairs without host OS involvement; prevents key extraction via side-channel or memory dump attacks. |
| Hardware Physical Presence (PP) support | Enables tamper-evident firmware updates and configuration changes by requiring physical button press or hardware switch activation before sensitive operations. |
| Low-power deep-sleep with dual-wakeup | Reduces system standby power by >90%; recovery requires coordinated low pulse on two dedicated pins-prevents accidental wake-up from noise or single-point failure. |
Applications
| Server Secure Boot | Industrial Control Authentication |
|---|---|
Use Scenario: Verifying firmware integrity during BIOS/UEFI initialization in rack-mounted servers and blade systems. IC Role / Device Role / Timing Role: TPM 1.2 root-of-trust enforcing measured boot chain; generates and seals cryptographic hashes of bootloader, kernel, and hypervisor components. Use Value: Prevents unauthorized firmware modification or malware persistence by binding execution state to hardware-protected keys stored in AT97SC3205T-X3A1610B's internal EEPROM. | Use Scenario: Authenticating field devices and controllers in programmable logic controller (PLC) networks and SCADA systems. IC Role / Device Role / Timing Role: Secure identity anchor providing device-unique credentials and signed challenge-response authentication to central HMIs or gateways. Use Value: Enables mutual TLS handshake and encrypted parameter updates using AT97SC3205T-X3A1610B's FIPS-certified RSA and AES engines-blocking spoofing and man-in-the-middle attacks. |
| Edge Gateway Data Integrity | Medical Device Firmware Signing |
Use Scenario: Securing firmware over-the-air (FOTA) updates and sensor data signing in cellular-connected IoT gateways. IC Role / Device Role / Timing Role: Cryptographic service provider generating ECDSA signatures for firmware images and HMACs for telemetry payloads via I²C host interface. Use Value: Ensures end-to-end authenticity and integrity using AT97SC3205T-X3A1610B's hardware-accelerated SHA-256 and RSA-2048 engines-eliminating software-only crypto bottlenecks. | Use Scenario: Enforcing FDA-required firmware validation and anti-tampering in Class II/III medical imaging and monitoring equipment. IC Role / Device Role / Timing Role: Tamper-resistant key vault and signature generator for digitally signed firmware updates and audit log sealing. Use Value: Meets IEC 62304 and FDA cybersecurity guidance by storing private keys in AT97SC3205T-X3A1610B's FIPS-140-2 certified EEPROM and performing signing operations inside hardened physical security circuitry. |
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 SLB9665TT2.0 | Same TPM 1.2 compliance, 32-pin QFN, 3.3 V, but uses SPI interface instead of I²C; lacks GPIO-Express-00 and PP/GPIO pins. | Requires SPI-capable host MCU; unsuitable where I²C bus is constrained or legacy I²C TPM integration is mandated. | Select when SPI interface is preferred and physical presence signaling is not required. |
| Nuvoton NPCT750AA0GX | TPM 2.0 compliant, 32-pin QFN, 3.3 V, I²C interface, but includes additional LPC interface and lacks FIPS-140-2 Level 2 certification for full module. | Supports newer TCG protocols (e.g., PCR extension, policy-based authorization) but does not satisfy FIPS-140-2 validation requirements for federal deployments. | Select for forward-looking TPM 2.0 adoption where FIPS-140-2 Level 2 is not contractually required. |
Compared with Infineon SLB9665TT2.0 and Nuvoton NPCT750AA0GX, the AT97SC3205T-X3A1610B uniquely combines I²C interface, FIPS-140-2 Level 2 certification, GPIO-Express-00, and hardware physical presence in a single 32-pin QFN-making it optimal for industrial and medical systems needing validated crypto assurance without protocol migration.
Availability
AT97SC3205T-X3A1610B is available at Aetrix Electronics and suitable for server secure boot, industrial control authentication, and medical device firmware signing requiring stable component supply across long-lifecycle embedded programs.
Supply support for AT97SC3205T-X3A1610B 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 trusted computing product lines, including TPM modules designed for hardware-rooted security in enterprise and industrial systems.
The AT97SC3205T-X3A1610B belongs to Atmel's TPM security controller family, engineered to deliver TCG-compliant, FIPS-validated cryptographic services in resource-constrained embedded platforms with minimal host software overhead.
FAQ
What is the interface type and maximum speed supported by the AT97SC3205T-X3A1610B?
The AT97SC3205T-X3A1610B uses an I²C interface compliant with both standard mode (100 kHz) and fast mode (400 kHz). For reliable 400 kHz operation, the datasheet specifies 800 Ω pull-up on SM_DAT and 1.5 kΩ on SM_CLK, with emphasis on maintaining a 50% duty cycle clock signal. The AT97SC3205T-X3A1610B does not support SPI or LPC interfaces.
Does the AT97SC3205T-X3A1610B have FIPS-140-2 certification, and what components does it cover?
Yes, the AT97SC3205T-X3A1610B is a FIPS-140-2 Level 2 certified module. Certification covers the integrated hardware random number generator (RNG), HMAC, AES, SHA, and RSA cryptographic engines-including key generation, encryption, and signature operations performed within the device. The AT97SC3205T-X3A1610B's EEPROM storage for RSA keys and NV user data falls under the same validated boundary.
What is the purpose of the PP/GPIO and GPIO-Express-00 pins on the AT97SC3205T-X3A1610B?
The PP/GPIO pin serves as a hardware physical presence indicator-active-high signal used to authorize sensitive TPM operations like dictionary attack lockout reset or owner hierarchy clear. GPIO-Express-00 is a dedicated general-purpose I/O mapped to TPM_NV_INDEX_GPIO_00, with internal pull-up, intended for platform-specific signaling such as chassis intrusion detection or secure boot status indication. Both pins are defined in the AT97SC3205T-X3A1610B's pinout and functional specification.
How does the AT97SC3205T-X3A1610B enter and exit low-power sleep mode?
The AT97SC3205T-X3A1610B automatically enters low-power sleep when idle. Recovery requires issuing the TPM_DeepSleep command followed by simultaneous active-low pulses on both TWI_Wakeup# pins (QFN pins 7 and 22). This dual-pin requirement prevents spurious wake-up events. The AT97SC3205T-X3A1610B does not support single-pin or timer-based wake-up mechanisms.
What package variant does the AT97SC3205T-X3A1610B use, and are there any special layout considerations?
The AT97SC3205T-X3A1610B uses the 32-pad Very Thin QFN (32M3) package: 4.0 × 4.0 × 0.90 mm body, 0.40 mm pitch, with exposed thermal pad internally connected to GND. Layout requires soldering the center pad to PCB ground plane for thermal and electrical stability. Decoupling capacitors (2200–4700 pF) must be placed within 5 mm of each VCC pin, and a 0.1 µF capacitor at the VCC node within 10 mm-per AT97SC3205T-X3A1610B design guidelines.
AT97SC3205T-X3A1610B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 28-TSSOP
AT97SC3205T-X3A1610B FAQ
1.How can I place an order for AT97SC3205T-X3A1610B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A1610B 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-X3A1610B reliable?
The price and inventory of AT97SC3205T-X3A1610B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A1610B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-X3A1610B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A1610B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-X3A1610B?
AT97SC3205T-X3A1610B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-X3A1610B 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-X3A1610B?
For technical support, including AT97SC3205T-X3A1610B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A1610B requirements.
6.How does Aetrix verify that AT97SC3205T-X3A1610B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-X3A1610B 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-X3A1610B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-X3A1610B?
All AT97SC3205T-X3A1610B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A1610B, 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-X3A1610B part is unused and in its original packaging.
Return procedure for AT97SC3205T-X3A1610B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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