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Microchip Technology AT97SC3205T-U3A1C-10
- Part No.:
- AT97SC3205T-U3A1C-10
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-U3A1C-10.pdf
- Description:
- FF IND I2C TPM 4.4MM TSSOP UEK
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
AT97SC3205T-U3A1C-10 from 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 (400kHz Fast Mode), targeting secure boot and platform authentication in embedded industrial control systems.
For engineers reviewing the AT97SC3205T-U3A1C-10 datasheet, AT97SC3205T-U3A1C-10 pinout, AT97SC3205T-U3A1C-10 application, or AT97SC3205T-U3A1C-10 equivalent, this page delivers verified package mapping (28-pin Thin TSSOP), confirmed I²C timing constraints, GPIO-Express-00 NV index assignment, TWI_Wakeup# dual-pin sleep recovery mechanism, and FIPS-140-2 module certification scope.
Technical Context
The AT97SC3205T-U3A1C-10 implements the full TCG TPM 1.2 specification stack in silicon, using an on-die AVR CPU to execute firmware-resident command parsing and cryptographic state management. Its hardware crypto engine accelerates RSA key generation and signing, while the FIPS-140-2 certified RNG feeds both internal key derivation and external system entropy requests.
Communication occurs exclusively via I²C (SM_DAT/SM_CLK), supporting 100kHz Standard Mode and 400kHz Fast Mode with strict pull-up requirements (800Ω on SM_DAT, 1.5kΩ on SM_CLK) and 50% duty-cycle sensitivity on SM_CLK for stability. Low-power operation is managed autonomously, with TWI_Wakeup# requiring coordinated low pulses on two pins to exit deep sleep.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation per TCG Main Specification Parts 1–3; not partial or subset compliance. |
| I²C Interface Speed | 400kHz Fast Mode or 100kHz Standard Mode; requires 800Ω pull-up on SM_DAT and 1.5kΩ on SM_CLK for reliable 400kHz operation. |
| Crypto Engines | FIPS-140-2 certified RNG, HMAC, AES, SHA, and RSA engines; RNG available to host system for entropy sourcing. |
| Non-Volatile Storage | 2066 bytes of user-defined NV space mapped to TPM_NV_INDEX_GPIO_00 and other indices; separate from RSA key EEPROM. |
| Supply Voltage | 3.3V ±10%; requires localized decoupling: 2200–4700pF capacitor <5mm from each VCC–GND pair plus 0.1μF at VCC node <10mm from device. |
| Operating Temperature | Industrial range: −40°C to +85°C; validated across full range for TCG command latency, crypto throughput, and I²C timing margin. |
| Package Type | 28-pin Thin TSSOP (4.40 × 9.70 mm, 0.65 mm pitch); RoHS-compliant, lead-free; no thermal pad required. |
Pinout & Package
AT97SC3205T-U3A1C-10 is supplied in a 28-pin Thin TSSOP package (4.40 mm × 9.70 mm body, 0.65 mm pitch), with exposed leads and no thermal pad. Pin 1 is marked by a beveled corner; pin numbering follows standard counter-clockwise convention from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply Input | 3.3V main supply; requires dedicated high-frequency decoupling (2200–4700pF) within 5mm of each VCC–GND pair. |
| LRESET# | Asynchronous Reset Input | Active-low reset; minimum pulse width 2μs; must remain asserted until VCC stabilizes at power-up. |
| SM_DAT | I²C Bidirectional Data Line | Open-drain data line; 800Ω pull-up required for stable 400kHz operation; supports TCG command framing and response payloads. |
| SM_CLK | I²C Clock Input | Input-only clock; 1.5kΩ pull-up recommended; 50% duty cycle critical for timing margin at 400kHz. |
| GPIO-Express-00 | Dedicated NV Index I/O | Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up; floats when unused; used for persistent GPIO state storage. |
| PP/GPIO | Physical Presence Indicator | Hardware physical presence input (active-high); also configurable as general-purpose GPIO with internal pull-down. |
| TWI_Wakeup# | Deep Sleep Recovery Signal | Two-pin coordinated wake signal; both pins must be pulsed low to exit TPM_DeepSleep mode; no single-pin wake capability. |
| PIRQ# | Interrupt Request Output | Open-drain interrupt output; asserts low to notify host of pending TPM events; requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 Turnkey 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 Module Certification | Certification covers RNG, HMAC, AES, SHA, and RSA engines as a unified cryptographic module; enables compliance documentation for regulated deployments. |
| Hardware Asymmetric Crypto Engine | Dedicated RSA acceleration engine offloads key generation and signing from host CPU; reduces latency and eliminates software-side side-channel exposure. |
| Internal EEPROM for RSA Keys | Secure on-die EEPROM stores multiple RSA key pairs with tamper-resistant write protection; no external flash required for key persistence. |
| 2066-byte User NV Storage | Allocated NV space accessible via TCG commands; supports custom application data such as device certificates, configuration flags, or audit logs. |
Applications
| Secure Boot Authentication | Platform Integrity Verification |
|---|---|
Use Scenario: Verifying firmware signature before loading bootloader in industrial PLCs with remote firmware update capability. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor; performs SHA-1/SHA-256 hash verification and RSA signature validation during cold boot sequence. Use Value: Prevents unauthorized firmware execution by binding boot integrity to hardware-stored keys; leverages FIPS-certified SHA/RSA engines for deterministic, auditable validation. | Use Scenario: Measuring BIOS, UEFI, and hypervisor memory regions during power-on self-test in ruggedized edge servers. IC Role / Device Role / Timing Role: TPM serves as measurement accumulator; extends PCR registers with SHA-1 hashes of critical firmware blocks pre-boot. Use Value: Enables remote attestation of platform state; uses on-die SHA engine to avoid host CPU dependency and reduce measurement window vulnerability. |
| Hardware Physical Presence Control | Secure Credential Storage |
Use Scenario: Enabling administrative TPM clear operations only when a physical button is pressed on medical imaging equipment. IC Role / Device Role / Timing Role: PP/GPIO pin detects mechanical switch closure; triggers TPM physical presence assertion required by TCG policy for destructive commands. Use Value: Enforces human-in-the-loop authorization for sensitive operations; uses dedicated hardware pin with internal pull-down to prevent false triggering. | Use Scenario: Storing TLS client certificates and private keys for encrypted communication in smart grid gateways. IC Role / Device Role / Timing Role: TPM provides isolated NV storage and RSA signing service; keys never leave secure boundary during TLS handshake. Use Value: Eliminates software key storage risks; leverages 2066-byte user NV space and FIPS-certified RSA engine for end-to-end credential lifecycle protection. |
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 |
|---|---|---|---|
| ST33HTPH2Z2AI0 | ARM-based TPM with SPI interface; supports TPM 2.0 and 1.2; includes additional ECC acceleration. | Requires SPI host interface redesign; supports newer TPM 2.0 features like hierarchical key trees and policy-based authorization. | Select when migrating to TPM 2.0 or requiring ECC-based attestation; not drop-in compatible due to interface and command set differences. |
| Infineon SLB9670 | TPM 2.0 compliant; supports both I²C and LPC interfaces; certified to Common Criteria EAL4+. | Supports broader OS driver compatibility (Windows/Linux TPM 2.0 stacks); requires firmware update for TCG 2.0 command handling. | Select for long-term roadmap alignment with TPM 2.0 ecosystem; I²C pinout differs-requires PCB layout revision. |
Compared with ST33HTPH2Z2AI0 and SLB9670, the AT97SC3205T-U3A1C-10 offers proven TPM 1.2 interoperability with legacy BIOS implementations and minimal host driver dependencies, making it optimal for cost-sensitive industrial designs where TCG 1.2 compliance suffices and I²C footprint constraints are tight.
Availability
AT97SC3205T-U3A1C-10 is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity verification, and hardware physical presence control requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AT97SC3205T-U3A1C-10 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
Atmel Corporation, now part of Microchip Technology, is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and security ICs for embedded applications.
The AT97SC3205T product line delivers integrated TPM 1.2 modules targeting industrial and commercial embedded platforms needing hardware-rooted trust without host CPU overhead or external crypto components.
FAQ
What is the primary compliance standard met by the AT97SC3205T-U3A1C-10?
The AT97SC3205T-U3A1C-10 is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification. It implements all mandatory TCG 1.2 command sets, platform configuration register (PCR) architecture, and key hierarchy requirements. This compliance is verified through functional testing against the TCG TPM Main Specification Parts 1–3, not limited to electrical or mechanical conformance.
Does the AT97SC3205T-U3A1C-10 support TPM 2.0 functionality?
No, the AT97SC3205T-U3A1C-10 is designed exclusively for TPM 1.2 compliance and does not support TPM 2.0 commands, algorithms (e.g., ECC), or hierarchical key structures. Its firmware, crypto engine, and command parser are fixed to the TCG 1.2 specification. Migration to TPM 2.0 requires hardware replacement with a certified 2.0 module such as the Infineon SLB9670.
How is low-power operation managed in the AT97SC3205T-U3A1C-10?
The AT97SC3205T-U3A1C-10 enters low-power sleep automatically during idle periods. Recovery requires coordinated low pulses on both TWI_Wakeup# pins-pin 7 and pin 22 in the 28-pin TSSOP package-as defined in the Atmel-specific TPM_DeepSleep command. No host polling or clock gating is needed; the device handles state retention and wake synchronization internally.
What are the I²C pull-up resistor requirements for reliable 400kHz operation of the AT97SC3205T-U3A1C-10?
For stable 400kHz Fast Mode I²C operation, the AT97SC3205T-U3A1C-10 requires an 800Ω pull-up resistor on SM_DAT and a 1.5kΩ pull-up on SM_CLK. These values are empirically validated in Atmel's characterization; deviations may cause setup/hold violations or clock stretching. The SM_CLK duty cycle must also approach 50% to maintain timing margin at maximum speed.
Is the AT97SC3205T-U3A1C-10 qualified for automotive applications?
No, the AT97SC3205T-U3A1C-10 is specified only for Commercial (0°C to 70°C) and Industrial (−40°C to +85°C) temperature ranges and is not qualified for automotive use. Atmel explicitly states that its products-including the AT97SC3205T-U3A1C-10-are not intended, authorized, or warranted for automotive applications unless specifically designated as automotive-grade, which this variant is not.
AT97SC3205T-U3A1C-10 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
AT97SC3205T-U3A1C-10 FAQ
1.How can I place an order for AT97SC3205T-U3A1C-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A1C-10 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-U3A1C-10 reliable?
The price and inventory of AT97SC3205T-U3A1C-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A1C-10 is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-U3A1C-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A1C-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-U3A1C-10?
AT97SC3205T-U3A1C-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-U3A1C-10 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-U3A1C-10?
For technical support, including AT97SC3205T-U3A1C-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A1C-10 requirements.
6.How does Aetrix verify that AT97SC3205T-U3A1C-10 is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-U3A1C-10 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-U3A1C-10 meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-U3A1C-10?
All AT97SC3205T-U3A1C-10 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A1C-10, 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-U3A1C-10 part is unused and in its original packaging.
Return procedure for AT97SC3205T-U3A1C-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-U3A1C-10 Tags
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CYPD3175-24LQXQ
Infineon Technologies
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SLB9672VU20FW1523XTMA1
Infineon Technologies
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SLB9670VQ20FW785XTMA1
Infineon Technologies
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SLB9672XU20FW1523XTMA1
Infineon Technologies
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SLB9673XU20FW2613XTMA1
Infineon Technologies
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CYPD3125-40LQXIT
Infineon Technologies
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AT97SC3204-U2A1A-20
Microchip Technology
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AT97SC3204-U2A1A-10
Microchip Technology
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SLM9670AQ20FW1311XTMA1
Infineon Technologies
-
SLB9672XU20FW1613XTMA1
Infineon Technologies
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SLB9672AU20FW1613XTMA1
Infineon Technologies
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SLB9673AU20FW2613XTMA1
Infineon Technologies
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