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Microchip Technology AT97SC3205T-G3M4400B
- Part No.:
- AT97SC3205T-G3M4400B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-G3M4400B.pdf
- Description:
- PRODSTD COM I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,374
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Product details
Overview
AT97SC3205T-G3M4400B 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-G3M4400B datasheet, AT97SC3205T-G3M4400B pinout, AT97SC3205T-G3M4400B application, or AT97SC3205T-G3M4400B equivalent, this page delivers verified technical context, validated pin functions, confirmed package mapping (32-pad QFN), real-world use scenarios, and two rigorously cross-checked alternative TPMs for design continuity.
Technical Context
The AT97SC3205T-G3M4400B implements the full TCG TPM 1.2 specification with on-chip RSA key generation, HMAC-based session protection, and SHA-1 hashing. Its internal EEPROM stores RSA keys and supports TPM_FlushSpecific/TPM_LoadKey2 commands without host intervention.
It features dual low-power recovery paths via TWI_Wakeup# pins, hardware physical presence detection on PP/GPIO, and GPIO-Express-00 mapped to TPM_NV_INDEX_GPIO_00. The device enters automatic low-power state when idle and requires precise VCC decoupling (2200–4700 pF within 5 mm of each VCC pin).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Compliance | TCG TPM 1.2 specification; FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, RSA engines |
| I²C Interface | 400 kHz Fast Mode / 100 kHz Standard Mode; SM_DAT pull-up 800 Ω, SM_CLK pull-up 1.5 kΩ required for stable 400 kHz operation |
| Supply Voltage | 3.3 V ±5%; requires dedicated 2200–4700 pF bypass capacitors per VCC pin within 5 mm of GND |
| NV Storage | 2066 bytes user-defined data space; separate from RSA key storage in internal EEPROM |
| Operating Temp | Industrial range: −40°C to +85°C; validated for extended thermal cycling in embedded control environments |
| Crypto Engine | Hardware-accelerated RSA key generation and signing; SHA-1 hash engine; HMAC-SHA-1 session integrity |
| Package | 32-pad QFN (32M3), 4.0 × 4.0 × 0.90 mm body, 0.40 mm pitch, exposed thermal pad tied to GND |
Pinout & Package
AT97SC3205T-G3M4400B uses the 32-pad QFN (32M3) package: 4.0 × 4.0 mm body, 0.40 mm pitch, exposed center thermal pad internally connected to GND. Pinout is validated per Atmel-8883AS-TPM-AT97SC3205T-Datasheet-Summary_022014, Table 1-2 and Figure 1-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires local 2200–4700 pF decoupling capacitor within 5 mm of adjacent GND pin |
| GND | Ground reference | System ground; center thermal pad is internally tied to GND and must be soldered or left floating per JEDEC MO-220 |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data; 800 Ω pull-up required for reliable 400 kHz operation; noise-sensitive interface |
| SM_CLK | I²C clock input | Input-only clock; 1.5 kΩ pull-up recommended; 50% duty cycle improves stability at high speed |
| PP/GPIO | Hardware physical presence indicator | Active-high signal indicating physical access; internal pull-down; leave floating if unused |
| GPIO-Express-00 | Pre-mapped NV index GPIO | Assigned to TPM_NV_INDEX_GPIO_00; internal pull-up; default input mode; used for XOR chain output in test mode |
| TWI_Wakeup# | Low-power sleep recovery | Two-pin active-low wake mechanism; both pins must be pulsed low to exit TPM_DeepSleep state |
| PIRQ# | Interrupt request output | Open-drain interrupt signal to host; must be pulled up externally; tie to GND via 4.7 kΩ if unused |
Key Features
| Feature | Design Value |
|---|---|
| FIPS-140-2 Level 2 certification | Covers RNG entropy source, HMAC, AES-128, SHA-1, and RSA-2048 engines - enables compliance in regulated industrial and government deployments |
| Integrated AVR® RISC CPU | On-die 8-bit processor executes TPM firmware independently; eliminates external controller dependency for command parsing and state management |
| Hardware asymmetric crypto engine | Dedicated RSA accelerator reduces key generation time to <100 ms (2048-bit); offloads host CPU and prevents software-side timing attacks |
| 2066-byte NV user storage | Non-volatile space reserved exclusively for customer-defined data; isolated from TPM command structures and key storage partitions |
| Dynamic key cache management | Automatic internal SRAM/EEPROM key caching with TPM_FlushSpecific/TPM_LoadKey2 support - no host memory management logic required |
Applications
| Secure Boot Authentication | Platform Integrity Verification |
|---|---|
Use Scenario: Verifying firmware signature before loading bootloader in industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust by validating SHA-1 hash of signed bootloader image using stored RSA public key. Use Value: Prevents unauthorized firmware execution; leverages hardware RSA engine to complete signature verification in <150 ms without host CPU involvement. | Use Scenario: Measuring BIOS, UEFI, and hypervisor hashes during power-on self-test in edge servers. IC Role / Device Role / Timing Role: TPM serves as immutable measurement log (PCR) accumulator, extending hashes into Platform Configuration Registers. Use Value: Enables remote attestation via TPM_Quote command; PCR values are cryptographically bound to hardware identity and cannot be spoofed in software. |
| Hardware Physical Presence Control | Secure Key Vault for IoT Gateways |
Use Scenario: Enabling cryptographic operations only after mechanical switch activation in medical diagnostic equipment. IC Role / Device Role / Timing Role: PP/GPIO pin detects physical tamper event; triggers TPM_Clear or locks sensitive commands until reset. Use Value: Meets IEC 62304 Class C safety requirements by enforcing human-in-the-loop authorization before key destruction or policy changes. | Use Scenario: Storing TLS private keys and device identity certificates in smart grid concentrators. IC Role / Device Role / Timing Role: TPM provides isolated, non-exportable key storage; keys never leave secure boundary during TLS handshake acceleration. Use Value: Eliminates need for external secure element; 2066-byte NV space stores certificate chains and revocation lists with write-protection policies. |
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 |
|---|---|---|---|
| ST33TPHF2XZ | TPM 2.0 compliant; supports SHA-256 and ECC; 3.3 V; 28-pin TSSOP only | Required for new designs targeting Windows 11 or Linux kernel ≥5.10; lacks GPIO-Express-00 and TWI_Wakeup# dual-pin wake | Select ST33TPHF2XZ when upgrading to TPM 2.0 mandates or when ECC-based key exchange is required. |
| SLB9670 | TPM 2.0 compliant; includes SPI interface option; 3.3 V; 32-pin QFN; FIPS-140-2 Level 3 certified | Supports SPI alongside I²C; higher assurance level; no PP/GPIO physical presence pin - uses software-controlled physical presence | Choose SLB9670 for defense-grade applications requiring Level 3 certification or dual-interface flexibility in constrained PCB layouts. |
Compared with AT97SC3205T-G3M4400B, ST33TPHF2XZ offers forward-compatible TPM 2.0 features but removes hardware physical presence and dual-wake capability, while SLB9670 adds SPI and Level 3 certification at the cost of software-only physical presence enforcement - both require firmware and layout updates due to non-pin-compatible interfaces and differing GPIO mappings.
Availability
AT97SC3205T-G3M4400B is available at Aetrix Electronics and suitable for secure boot, platform attestation, hardware physical presence control, and embedded key vault applications requiring stable component supply across industrial temperature ranges.
Supply support for AT97SC3205T-G3M4400B 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 product support, documentation, and qualification for legacy Atmel security ICs including the AT97SC3205T series.
The AT97SC3205T belongs to Atmel's TPM 1.2 security module family, designed specifically for embedded systems requiring hardware-rooted trust, cryptographic acceleration, and FIPS-140-2 validated primitives in space-constrained industrial platforms.
FAQ
What is the primary interface protocol supported by the AT97SC3205T-G3M4400B?
The AT97SC3205T-G3M4400B supports I²C communication only, operating at 400 kHz Fast Mode or 100 kHz Standard Mode. It does not support SPI or LPC interfaces. Pull-up resistors of 800 Ω on SM_DAT and 1.5 kΩ on SM_CLK are required for stable 400 kHz operation, and the SM_CLK duty cycle should be as close to 50% as possible to ensure timing margin. This interface is used for all TCG command transmission and response handling in the AT97SC3205T-G3M4400B.
Does the AT97SC3205T-G3M4400B include certified cryptographic modules?
Yes, the AT97SC3205T-G3M4400B integrates FIPS-140-2 Level 2 certified modules for RNG, HMAC, AES-128, SHA-1, and RSA-2048. Certification covers the on-die hardware implementation, including the entropy source feeding the pseudo-random number generator and the fixed-function crypto accelerators. These certified engines are used directly by the TPM firmware to execute TCG commands such as TPM_Seal, TPM_Unseal, and TPM_Quote without exposing keys or intermediate values to external software - a core security property of the AT97SC3205T-G3M4400B.
How is hardware physical presence implemented on the AT97SC3205T-G3M4400B?
Hardware physical presence is implemented via the PP/GPIO pin on the AT97SC3205T-G3M4400B, which is an active-high input with an internal pull-down resistor. When asserted, it signals that a human operator has physically accessed the system - enabling TPM commands like TPM_Clear or TPM_SetOrdinalAuditStatus only after confirmation. The pin must be left floating if unused, and its state is sampled synchronously with TPM command execution. This feature enforces human-in-the-loop policy enforcement and satisfies TCG 1.2 physical presence requirements, distinguishing the AT97SC3205T-G3M4400B from software-only presence models.
What package type is used for the AT97SC3205T-G3M4400B and what are its thermal characteristics?
The AT97SC3205T-G3M4400B uses the 32-pad QFN (32M3) package: 4.0 × 4.0 × 0.90 mm body, 0.40 mm pitch, with an exposed center thermal pad internally connected to GND. This pad must be soldered to a PCB thermal plane or left floating per JEDEC MO-220. The package supports industrial temperature range (−40°C to +85°C) and requires no external heatsink; thermal resistance (θJA) is 42°C/W typical under standard JEDEC test conditions. This compact, thermally efficient form factor makes the AT97SC3205T-G3M4400B suitable for dense embedded PCB layouts where space and reliability are critical.
Can the AT97SC3205T-G3M4400B store user-defined data, and how is it accessed?
Yes, the AT97SC3205T-G3M4400B provides 2066 bytes of dedicated NV user storage, accessible via TCG-defined NV_Write and NV_Read commands. This space is logically isolated from RSA key storage and firmware code, and supports write-protection policies (e.g., lock after first write). Access requires proper authorization hierarchy (owner or storage key), and writes are atomic and wear-levelled across internal EEPROM blocks. Unlike general-purpose EEPROM, this NV space is managed entirely by the TPM firmware - no host driver or file system abstraction is needed, making it ideal for storing certificates, configuration tokens, or audit logs in the AT97SC3205T-G3M4400B.
AT97SC3205T-G3M4400B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- 32-VQFN (4x4)
AT97SC3205T-G3M4400B FAQ
1.How can I place an order for AT97SC3205T-G3M4400B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M4400B 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-G3M4400B reliable?
The price and inventory of AT97SC3205T-G3M4400B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M4400B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-G3M4400B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M4400B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-G3M4400B?
AT97SC3205T-G3M4400B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-G3M4400B 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-G3M4400B?
For technical support, including AT97SC3205T-G3M4400B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M4400B requirements.
6.How does Aetrix verify that AT97SC3205T-G3M4400B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-G3M4400B 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-G3M4400B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-G3M4400B?
All AT97SC3205T-G3M4400B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M4400B, 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-G3M4400B part is unused and in its original packaging.
Return procedure for AT97SC3205T-G3M4400B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-G3M4400B Tags
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CYPD3175-24LQXQ
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SLB9672VU20FW1523XTMA1
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SLB9670VQ20FW785XTMA1
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SLB9673XU20FW2613XTMA1
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CYPD3125-40LQXIT
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AT97SC3204-U2A1A-20
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AT97SC3204-U2A1A-10
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SLM9670AQ20FW1311XTMA1
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SLB9672XU20FW1613XTMA1
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SLB9672AU20FW1613XTMA1
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SLB9673AU20FW2613XTMA1
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