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Microchip Technology AT97SC3205T-U3A19-AA
- Part No.:
- AT97SC3205T-U3A19-AA
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-U3A19-AA.pdf
- Description:
- CUST SPEC TPM 1.2 IND I2C4.4MM T
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT97SC3205T-U3A19-AA 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 up to 400kHz and supports industrial temperature range (−40°C to +85°C) in 32-pad QFN package.
For engineers reviewing the AT97SC3205T-U3A19-AA datasheet, AT97SC3205T-U3A19-AA pinout, AT97SC3205T-U3A19-AA application, or AT97SC3205T-U3A19-AA equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in secure boot and firmware attestation, and confirmed alternative TPM modules for embedded system design and supply continuity planning.
Technical Context
The AT97SC3205T-U3A19-AA implements the full TCG TPM 1.2 specification stack in silicon, including command parsing, cryptographic key management, and physical presence assertion via dedicated PP/GPIO pin. Its internal EEPROM stores RSA keys, while the hardware RNG feeds all protocol-level randomization requirements.
It uses a dedicated I²C interface (SM_DAT/SM_CLK) with configurable pull-up guidance (800Ω on SM_DAT, 1.5kΩ on SM_CLK for 400kHz operation), supports low-power deep-sleep recovery via TWI_Wakeup# dual-pin activation, and enforces secure boot integrity through tamper-resistant firmware and layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables standardized secure boot, remote attestation, and sealed storage in Windows/Linux enterprise environments. |
| Crypto Engine | Hardware-accelerated RSA, AES, SHA-1, HMAC - offloads CPU during key generation, signature verification, and hash operations without software library dependency. |
| I²C Interface | 400kHz Fast Mode / 100kHz Standard Mode - supports high-speed host communication with documented pull-up resistor values for signal integrity. |
| Supply Voltage | 3.3V ±10% - requires tight decoupling (2200–4700pF near each VCC pin, 0.1μF shared node) to maintain FIPS-140-2 certified operation across temperature. |
| NV Storage | 2066 bytes user-defined data space - persistent storage for platform configuration, policy blobs, or custom credentials outside TCG-defined indices. |
| Operating Temp | −40°C to +85°C - qualified for industrial embedded systems including network infrastructure, medical devices, and edge controllers. |
| Package | 32-pad QFN (4.0×4.0×0.90 mm, 0.40 mm pitch) - surface-mount compatible with automated assembly; exposed thermal pad tied to GND. |
Pinout & Package
AT97SC3205T-U3A19-AA is supplied in a 32-pad Very Thin QFN (32M3) package with 0.40 mm pitch and 4.0×4.0 mm body. The center thermal pad is internally connected to GND and may be left floating or soldered to GND for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3V main supply requiring localized decoupling (2200–4700pF) within 5 mm of each pin and shared 0.1μF capacitor ≤10 mm from device. |
| GND | Ground reference | System ground; center thermal pad is internally tied to GND and may be soldered for thermal relief. |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data; 800Ω pull-up recommended for reliable 400kHz operation; must be externally pulled up. |
| SM_CLK | I²C clock input | Open-drain I²C clock; 1.5kΩ pull-up recommended for 400kHz; 50% duty cycle improves timing margin. |
| PP/GPIO | Physical presence indicator | Active-high hardware presence signal; internal pull-down; floats high when asserted; used for BIOS-level TPM enablement. |
| TWI_Wakeup# | Low-power wake trigger | Two pins (TSSOP 7 & 22, QFN 13 & 28) must both be pulsed low to exit deep-sleep mode per TPM_DeepSleep command. |
| GPIO-Express-00 | Pre-mapped NV GPIO | Internally mapped to TPM_NV_INDEX_GPIO_00; internal pull-up; floats high when unused; used for platform-specific state signaling. |
| PIRQ# | Interrupt request output | Active-low interrupt to host processor upon TPM event completion; must be pulled down if unused. |
Key Features
| Feature | Design Value |
|---|---|
| FIPS-140-2 Certification | Certified RNG, HMAC, AES, SHA, and RSA engines - eliminates need for external validation in regulated industries (e.g., healthcare, finance). |
| Single-Chip Turnkey TPM | Integrates AVR CPU, crypto accelerators, EEPROM, SRAM, and physical security circuitry - no external components required for full TPM 1.2 compliance. |
| Secure Key Storage | Internal EEPROM stores RSA keys with hardware-enforced access control - prevents extraction via side-channel or fault injection attacks. |
| Hardware Physical Presence | Dedicated PP/GPIO pin with internal pull-down - enables BIOS-level user consent for critical TPM operations (e.g., clearing ownership). |
| Low-Power Deep Sleep | TPM_DeepSleep command reduces current draw; recovery requires dual-pin TWI_Wakeup# pulse - extends battery life in portable/embedded platforms. |
Applications
| Secure Boot Validation | Firmware Attestation |
|---|---|
Use Scenario: Verifying integrity of bootloader and OS kernel before execution in industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust by measuring code hashes into Platform Configuration Registers (PCRs) and signing attestations. Use Value: Prevents unauthorized firmware modification; enables remote verification of runtime state using AT97SC3205T-U3A19-AA's certified SHA-1 and RSA signing capability. | Use Scenario: Confirming firmware version and patch level of field-deployed medical imaging devices during service calls. IC Role / Device Role / Timing Role: TPM generates time-bound signed reports containing PCR values and platform identity. Use Value: Provides cryptographically verifiable proof of firmware authenticity using AT97SC3205T-U3A19-AA's FIPS-140-2 certified HMAC and RSA engines. |
| Hardware-Based Disk Encryption | Platform Identity Binding |
Use Scenario: Enabling BitLocker or LUKS encryption keys bound to specific hardware in enterprise laptops and rugged tablets. IC Role / Device Role / Timing Role: TPM seals encryption keys to PCR values representing boot state; unseals only when measured state matches. Use Value: Ensures encrypted data remains inaccessible if drive is moved to another system - enforced by AT97SC3205T-U3A19-AA's internal key storage and binding logic. | Use Scenario: Uniquely identifying network switches during zero-touch provisioning in SD-WAN deployments. IC Role / Device Role / Timing Role: TPM generates and stores an Endorsement Key (EK) and Attestation Identity Key (AIK) tied to silicon identity. Use Value: Enables certificate-based authentication without exposing private keys - leveraging AT97SC3205T-U3A19-AA's hardware-isolated key generation and storage. |
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 | TPM 2.0 compliant; supports SHA-256 and ECC; higher power consumption in active mode. | Required for new designs targeting Windows 11 or Linux distributions mandating TPM 2.0; not backward-compatible with legacy TPM 1.2 stacks. | Select SLB9665TT2.0 only when upgrading to TPM 2.0 is mandatory; AT97SC3205T-U3A19-AA remains optimal for existing TPM 1.2 infrastructure. |
| Nuvoton NPCT650KB0DX | TPM 1.2 compliant; same I²C interface; smaller 24-pin QFN package; lower NV storage (1024 bytes). | Suitable for space-constrained designs where full 2066-byte NV space is not required; identical TCG command set and integration effort. | Choose NPCT650KB0DX for compact PCB layouts; retain AT97SC3205T-U3A19-AA when extended NV storage or industrial temp range is critical. |
Compared with Infineon SLB9665TT2.0 and Nuvoton NPCT650KB0DX, AT97SC3205T-U3A19-AA uniquely balances FIPS-140-2 certification, industrial temperature support, and 2066-byte NV storage in a mature TPM 1.2 implementation - making it ideal for long-lifecycle embedded systems where specification stability outweighs feature expansion.
Availability
AT97SC3205T-U3A19-AA is available at Aetrix Electronics and suitable for secure boot validation, firmware attestation, hardware-based disk encryption, and platform identity binding requiring stable component supply across industrial and medical electronics programs.
Supply support for AT97SC3205T-U3A19-AA 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. The company specializes in microcontrollers, analog, and security ICs for industrial, automotive, and communications markets.
AT97SC3205T-U3A19-AA belongs to Atmel's TPM security controller family, designed specifically to deliver certified, single-chip Trusted Platform Module functionality for embedded systems needing hardware-rooted trust without external crypto co-processors.
FAQ
What is the operating voltage range for the AT97SC3205T-U3A19-AA?
The AT97SC3205T-U3A19-AA operates at a nominal supply voltage of 3.3V ±10%, meaning it accepts 2.97V to 3.63V. Stable regulation and strict decoupling (2200–4700pF capacitors within 5 mm of each VCC pin, plus a shared 0.1μF capacitor ≤10 mm from the device) are mandatory to sustain FIPS-140-2 certified operation across its full −40°C to +85°C industrial temperature range.
Does the AT97SC3205T-U3A19-AA support TPM 2.0?
No, the AT97SC3205T-U3A19-AA 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. For TPM 2.0 compliance, consider alternatives like the Infineon SLB9665TT2.0 - but note that AT97SC3205T-U3A19-AA remains fully supported for legacy and maintenance-focused TPM 1.2 deployments.
How is the AT97SC3205T-U3A19-AA's NV storage allocated and accessed?
The AT97SC3205T-U3A19-AA provides 2066 bytes of non-volatile user-defined storage, accessible via standard TCG TPM 1.2 commands (e.g., TPM_NV_DefineSpace, TPM_NV_Write). This space is separate from internal key storage and PCR registers. Access is subject to authorization policies defined during space creation, and data persists across power cycles - enabling secure storage of platform-specific credentials, configuration tokens, or audit logs within the AT97SC3205T-U3A19-AA's protected boundary.
What is the function of the PP/GPIO pin on the AT97SC3205T-U3A19-AA?
The PP/GPIO pin on the AT97SC3205T-U3A19-AA serves as the Hardware Physical Presence indicator - an active-high signal used by the BIOS/UEFI to confirm user intent before executing sensitive TPM operations (e.g., clearing ownership or disabling the TPM). It has an internal pull-down resistor, so it floats low when inactive and must be driven high by the platform to assert presence. In unused configurations, it should be left floating per AT97SC3205T-U3A19-AA datasheet guidance.
Can the AT97SC3205T-U3A19-AA enter low-power mode, and how is it woken?
Yes, the AT97SC3205T-U3A19-AA supports low-power deep-sleep mode triggered by the TPM_DeepSleep command. Recovery requires pulsing both TWI_Wakeup# pins (QFN pins 13 and 28) low simultaneously - a dual-pin activation mechanism preventing accidental wake events. This behavior is unique to the AT97SC3205T-U3A19-AA and differs from simpler single-pin wake schemes found in other security ICs.
AT97SC3205T-U3A19-AA 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-U3A19-AA FAQ
1.How can I place an order for AT97SC3205T-U3A19-AA through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-U3A19-AA 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-U3A19-AA reliable?
The price and inventory of AT97SC3205T-U3A19-AA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-U3A19-AA is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-U3A19-AA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-U3A19-AA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-U3A19-AA?
AT97SC3205T-U3A19-AA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-U3A19-AA 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-U3A19-AA?
For technical support, including AT97SC3205T-U3A19-AA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-U3A19-AA requirements.
6.How does Aetrix verify that AT97SC3205T-U3A19-AA is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-U3A19-AA 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-U3A19-AA meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-U3A19-AA?
All AT97SC3205T-U3A19-AA units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-U3A19-AA, 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-U3A19-AA part is unused and in its original packaging.
Return procedure for AT97SC3205T-U3A19-AA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-U3A19-AA Tags
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CYPD3175-24LQXQ
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