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Microchip Technology AT97SC3205T-G3M4C20B
- Part No.:
- AT97SC3205T-G3M4C20B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4C20B.pdf
- Description:
- PROD FF COM I2C TPM 4X4 32VQFN S
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
AT97SC3205T-G3M4C20B from Microchip (formerly 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 400 kHz and targets secure boot, platform authentication, and key management in embedded systems.
For engineers reviewing the AT97SC3205T-G3M4C20B datasheet, AT97SC3205T-G3M4C20B pinout, AT97SC3205T-G3M4C20B application, or AT97SC3205T-G3M4C20B equivalent, this page delivers verified electrical specs, validated pin functions, confirmed package mapping (32-pin QFN), real-world use cases, and two documented alternative TPMs for design continuity.
Technical Context
The AT97SC3205T-G3M4C20B implements the full TCG TPM 1.2 specification in silicon, using an on-chip AVR 8-bit RISC CPU to execute firmware-based command parsing and state management. Its hardware crypto engine accelerates RSA key generation and signing, SHA-1 hashing, HMAC-SHA1, and AES encryption without host CPU involvement.
It supports dual I²C modes (100 kHz standard / 400 kHz fast), includes dedicated physical presence (PP/GPIO) and tamper detection (XTAMPER via TestBI/GPIO/XTAMPER), and enters low-power sleep via TWI_Wakeup#-controlled recovery - all managed by internal security circuitry compliant with FIPS-140-2 Level 2 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | Full TPM 1.2 specification implementation - enables interoperable trusted computing across BIOS, OS, and firmware stacks. |
| Crypto Engines | FIPS-140-2 certified RNG, AES-128, SHA-1, HMAC-SHA1, and RSA-2048 - offloads cryptographic operations from host processor. |
| I²C Interface | 400 kHz Fast Mode / 100 kHz Standard Mode - supports high-speed secure communication with host controllers without protocol translation. |
| Supply Voltage | 3.3 V ±10% - requires tight decoupling (2200–4700 pF near each VCC pin, 0.1 µF shared node) for stable operation over temperature. |
| Nonvolatile Storage | 2066 bytes user-defined NV space - stores persistent keys, certificates, or policy data independent of host memory. |
| Operating Temp | −40°C to +85°C industrial range - qualified for deployment in rugged embedded environments including industrial gateways and edge servers. |
| Package | 32-pad QFN (4.0 × 4.0 × 0.90 mm, 0.40 mm pitch) - surface-mount compatible with automated assembly and thermal performance suitable for dense PCB layouts. |
Pinout & Package
AT97SC3205T-G3M4C20B is packaged in a 32-pad Very Thin QFN (32M3) with exposed thermal pad tied internally to GND. Pin assignment follows the QFN variant shown in Figure 1-1 and Table 1-2 of the summary datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply requiring localized decoupling (2200–4700 pF) within 5 mm of each VCC pin and adjacent GND. |
| GND | Ground reference | System ground; substrate center pad is internally connected to GND - may be left floating or soldered to PCB ground plane. |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data pin; requires external pull-up (800 Ω recommended for 400 kHz operation). |
| SM_CLK | I²C clock input | Input-only I²C clock; 50% duty cycle improves stability at 400 kHz; 1.5 kΩ pull-up recommended. |
| PP/GPIO | Hardware physical presence indicator | Active-high GPIO used to assert physical presence during TPM initialization; internal pull-down ensures safe default state. |
| TestBI/GPIO/XTAMPER | Multiplexed tamper input or GPIO | Configurable as XTAMPER for external tamper detection or general-purpose I/O; tie to GND if unused. |
| TWI_Wakeup# | Low-power wake signal | Active-low input used with PP/GPIO to exit deep-sleep mode after TPM_DeepSleep command execution. |
| PIRQ# | Interrupt request output | Open-drain interrupt signal asserted by TPM to notify host of command completion or event; requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Single-chip TPM 1.2 solution | Integrates CPU, crypto engines, RNG, EEPROM, and I²C interface in one die - eliminates multi-chip timing and layout complexity. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies regulatory and enterprise security validation requirements out-of-box. |
| Hardware asymmetric crypto acceleration | Offloads RSA-2048 key generation and signing from host CPU - reduces latency and prevents software-side side-channel leakage. |
| 2066-byte user NV storage | Dedicated nonvolatile memory space mapped to TPM_NV_INDEX - enables secure storage of custom keys, policies, or attestation logs without host OS dependency. |
| Industrial temperature support | Rated −40°C to +85°C - validated for continuous operation in uncontrolled environments such as factory automation and telecom infrastructure. |
Applications
| Secure Boot Authentication | Platform Integrity Verification |
|---|---|
Use Scenario: Verifying firmware signature before loading UEFI or bootloader in industrial controllers. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, performing SHA-1 hash and RSA-2048 signature verification of boot images stored in flash. Use Value: Prevents unauthorized firmware modification by binding measurement to hardware-locked keys stored in internal EEPROM. | Use Scenario: Measuring and reporting system configuration (e.g., BIOS version, driver hashes) to remote attestation servers. IC Role / Device Role / Timing Role: TPM collects PCR (Platform Configuration Register) values via TCG-defined extend operations during boot and runtime. Use Value: Enables verifiable proof of system state integrity - critical for compliance audits and zero-trust network access control. |
| Hardware-Based Key Management | Physical Presence Enforcement |
Use Scenario: Storing and protecting TLS private keys used by edge gateway devices communicating with cloud services. IC Role / Device Role / Timing Role: TPM serves as secure key vault - generates, wraps, and unwraps keys using internal RSA engine and NV storage. Use Value: Eliminates exposure of private keys in RAM or file systems; keys never leave the TPM boundary during cryptographic operations. | Use Scenario: Requiring manual button press before enabling sensitive TPM commands like ClearOwner or DictionaryAttackLockReset. IC Role / Device Role / Timing Role: PP/GPIO pin detects hardware-level physical presence assertion - gates privileged command execution per TCG spec. Use Value: Enforces human-in-the-loop authorization for security-critical operations, mitigating remote privilege escalation attacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TPM security module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST33TPHF2XSS | TPM 2.0 compliant; supports SHA-256, ECC, and PCR banks beyond TPM 1.2 scope; 3.3 V I²C interface; 32-pin QFN package. | Required for new designs targeting Windows 11, Linux kernel ≥5.12, or FIDO2-compliant platforms where TPM 2.0 is mandated. | Select ST33TPHF2XSS when upgrading to TPM 2.0 compliance is required; not drop-in compatible due to protocol and command set differences. |
| Infineon SLB9670 | TPM 2.0 certified; integrated SHA-256 and ECC crypto engines; supports both I²C and SPI interfaces; 32-pin QFN package. | Suitable for designs needing dual-interface flexibility or higher throughput via SPI; broader OEM qualification history in PC/server markets. | Choose SLB9670 for SPI-capable hosts or where Infineon's long-term supply assurance and automotive-grade variants are prioritized. |
Compared with AT97SC3205T-G3M4C20B, ST33TPHF2XSS and SLB9670 offer TPM 2.0 functionality essential for modern OS requirements but require firmware redesign due to non-interoperable command sets and extended PCR architectures - making them alternatives rather than direct replacements.
Availability
AT97SC3205T-G3M4C20B is available at Aetrix Electronics and suitable for secure boot, platform attestation, hardware key vaulting, and physical presence enforcement requiring stable component supply across industrial and embedded product lifecycles.
Supply support for AT97SC3205T-G3M4C20B 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 legacy Atmel security products under its Secure Products division. The company specializes in microcontrollers, analog, and security ICs for industrial, automotive, and IoT applications.
The AT97SC3205T-G3M4C20B belongs to Atmel's legacy TPM family designed specifically for embedded systems requiring TCG-compliant hardware-rooted trust - emphasizing integration, FIPS certification, and industrial temperature resilience over protocol evolution.
FAQ
What is the primary security function of the AT97SC3205T-G3M4C20B?
The AT97SC3205T-G3M4C20B serves as a hardware-rooted trust anchor implementing the TCG TPM 1.2 specification. It provides secure key generation and storage, cryptographic acceleration (RSA-2048, SHA-1, AES-128), platform configuration measurement, and physical presence enforcement - all within a FIPS-140-2 Level 2 certified silicon boundary. Its core purpose is to establish verifiable system integrity from power-on.
Does the AT97SC3205T-G3M4C20B support TPM 2.0?
No, the AT97SC3205T-G3M4C20B implements only the TCG TPM 1.2 specification. It does not support TPM 2.0 features such as SHA-256, ECC algorithms, hierarchical key structures, or the updated command set. For TPM 2.0 compliance, alternatives like the ST33TPHF2XSS or Infineon SLB9670 must be evaluated - and firmware adaptation is required due to fundamental protocol incompatibility.
What package type is used for the AT97SC3205T-G3M4C20B?
The AT97SC3205T-G3M4C20B uses a 32-pad Very Thin QFN (VQFN) package designated as 32M3: 4.0 mm × 4.0 mm body, 0.40 mm pitch, and 0.90 mm height. The exposed thermal pad is internally connected to GND, allowing optional soldering to the PCB ground plane for improved thermal dissipation and EMI performance.
How is the I²C interface configured on the AT97SC3205T-G3M4C20B?
The AT97SC3205T-G3M4C20B uses open-drain I²C signaling on SM_DAT and SM_CLK pins, supporting both 100 kHz (Standard Mode) and 400 kHz (Fast Mode). Pull-up resistors are mandatory: 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK are validated for reliable 400 kHz operation. Clock duty cycle should approach 50% to maximize communication stability.
What is the purpose of the PP/GPIO and TWI_Wakeup# pins on the AT97SC3205T-G3M4C20B?
The PP/GPIO pin serves dual roles: as a hardware physical presence indicator (active-high) for gating privileged TPM commands, and as a general-purpose input/output with internal pull-down. The TWI_Wakeup# pin - used together with PP/GPIO - enables recovery from low-power deep-sleep mode after execution of the TPM_DeepSleep command, requiring both pins to be pulsed low to resume operation.
AT97SC3205T-G3M4C20B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- 32-VQFN (4x4)
AT97SC3205T-G3M4C20B FAQ
1.How can I place an order for AT97SC3205T-G3M4C20B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4C20B 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-G3M4C20B reliable?
The price and inventory of AT97SC3205T-G3M4C20B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4C20B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4C20B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4C20B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4C20B?
AT97SC3205T-G3M4C20B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4C20B 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-G3M4C20B?
For technical support, including AT97SC3205T-G3M4C20B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4C20B requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4C20B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4C20B 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-G3M4C20B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4C20B?
All AT97SC3205T-G3M4C20B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4C20B, 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-G3M4C20B part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4C20B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4C20B Tags
-
CYPD3175-24LQXQ
Infineon Technologies
-
SLB9672VU20FW1523XTMA1
Infineon Technologies
-
SLB9670VQ20FW785XTMA1
Infineon Technologies
-
SLB9672XU20FW1523XTMA1
Infineon Technologies
-
SLB9673XU20FW2613XTMA1
Infineon Technologies
-
CYPD3125-40LQXIT
Infineon Technologies
-
AT97SC3204-U2A1A-20
Microchip Technology
-
AT97SC3204-U2A1A-10
Microchip Technology
-
SLM9670AQ20FW1311XTMA1
Infineon Technologies
-
SLB9672XU20FW1613XTMA1
Infineon Technologies
-
SLB9672AU20FW1613XTMA1
Infineon Technologies
-
SLB9673AU20FW2613XTMA1
Infineon Technologies
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