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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

Microchip Technology AT97SC3205T-G3M44-20

Name: AT97SC3205T-G3M44-20
Brand: Microchip Technology
SKU: AT97SC3205T-G3M44-20
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT97SC3205T-G3M44-20

Manufacturer:: Microchip Technology

Category:: Application Specific Microcontrollers

Package:: 32-VFQFN Exposed Pad

Datasheet:: AT97SC3205T-G3M44-20.pdf

Description:: PROD STD COM I2C TPM 4X4 32VQFN

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Product details

Overview

AT97SC3205T-G3M44-20 from Microchip Technology (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 (400 kHz Fast Mode) and targets secure boot, platform authentication, and key management in embedded computing systems.

For engineers reviewing the AT97SC3205T-G3M44-20 datasheet, AT97SC3205T-G3M44-20 pinout, AT97SC3205T-G3M44-20 application, or AT97SC3205T-G3M44-20 equivalent, this page delivers verified electrical specs, validated I²C timing constraints, confirmed GPIO-Express mapping, industrial temperature range (-40°C to +85°C), and QFN-32 package mechanical data per JEDEC MO-220.

Technical Context

The AT97SC3205T-G3M44-20 implements the full TCG TPM 1.2 specification using an on-die AVR 8-bit RISC CPU with dedicated crypto accelerators for RSA, SHA-1, HMAC, and AES. Its internal EEPROM stores RSA keys and supports dynamic key cache management without host intervention.

It uses a dual-voltage I²C interface (SM_DAT/SM_CLK) with strict pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK) for stable 400 kHz operation and includes hardware physical presence (PP/GPIO), tamper detection (XTAMPER via TestBI/GPIO/XTAMPER), and low-power deep-sleep recovery via TWI_Wakeup# pins.

Key Specifications

Parameter	Value and Actual Design Meaning
TCG Compliance	Full TPM 1.2 specification implementation - enables standardized platform integrity attestation and sealed storage.
I²C Interface Speed	400 kHz Fast Mode / 100 kHz Standard Mode - requires precise pull-up values (800 Ω SM_DAT, 1.5 kΩ SM_CLK) for reliable high-speed communication.
Supply Voltage	3.3 V ±10% - mandates tight decoupling: 2200–4700 pF caps <5 mm from each VCC pin and 0.1 µF cap <10 mm at VCC node.
NV User Storage	2066 bytes - allocated for customer-defined persistent data (e.g., certificates, configuration flags) accessible via TPM_NV_Write/Read commands.
Crypto Certification	FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, RSA - validates cryptographic primitives for government and regulated industry use.
Operating Temperature	-40°C to +85°C - qualified for industrial environments with no derating required across full range.
Package Type	32-pad QFN (32M3), 4.0 × 4.0 × 0.90 mm, 0.40 mm pitch, exposed thermal pad tied to GND - enables compact PCB layout and thermal dissipation.

Pinout & Package

AT97SC3205T-G3M44-20 is supplied in a 32-pad Very Thin QFN (VQFN) package per JEDEC MO-220 (32M3 drawing), with 4.0 × 4.0 mm body, 0.40 mm pitch, and exposed center thermal pad internally connected to GND.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Power supply input	3.3 V main supply; requires localized decoupling (2200–4700 pF <5 mm to adjacent GND) and system-level 0.1 µF bypass.
GND	Ground reference	System ground; center thermal pad is internally bonded to GND and must be soldered to PCB ground plane for thermal and EMI performance.
SM_DAT	I²C bidirectional data line	Open-drain I²C data; requires 800 Ω pull-up for stable 400 kHz operation; noise-sensitive - route away from switching nodes.
SM_CLK	I²C clock input	Open-drain I²C clock; requires 1.5 kΩ pull-up and near-50% duty cycle for optimal timing margin at 400 kHz.
PP/GPIO	Hardware physical presence indicator	Active-high GPIO with internal pull-down; signals physical access event to host firmware; must float if unused.
TestBI/GPIO/XTAMPER	Tamper detection input	Configurable as external tamper sensor (XTAMPER) or GPIO; active-high; tie to GND via 4.7 kΩ if unused.
TWI_Wakeup#	Low-power sleep recovery	Two-pin wake signal (pins 7 & 22); both must be pulsed low to exit TPM_DeepSleep mode; pin 22 must be tied to GND or VCC.
PIRQ#	Interrupt request output	Active-low open-drain interrupt to host processor; indicates pending TPM command completion or error; requires external pull-up.

Key Features

Feature	Design Value
Single-chip TPM 1.2 solution	Integrates AVR CPU, crypto engines, RNG, EEPROM, and I²C interface - eliminates external components and reduces BOM count by ≥4 discrete ICs.
FIPS-140-2 Level 2 certification	Covers RNG, HMAC, AES, SHA, and RSA - satisfies U.S. federal and global regulatory requirements for cryptographic module validation.
Hardware Physical Presence (PP)	Dedicated PP/GPIO pin with internal pull-down - enables BIOS-level enforcement of physical admin approval before sensitive operations (e.g., clearing TPM).
XTAMPER support	TestBI/GPIO/XTAMPER pin provides hardware tamper sensing - triggers immediate key zeroization upon detected enclosure breach or voltage glitch.
Dynamic key cache management	Automatic SRAM-based RSA key caching with TPM_FlushSpecific/TPM_LoadKey2 handling - relieves host software from memory management overhead.

Applications

Secure Boot Authentication	Platform Integrity Attestation
Use Scenario: Verifying firmware signature and measuring boot sequence integrity during power-on self-test (POST) in industrial gateways. IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, storing PCR (Platform Configuration Register) values and signing measurement logs via RSA-2048. Use Value: Prevents unauthorized firmware execution by binding boot measurements to hardware-bound keys stored in AT97SC3205T-G3M44-20's internal EEPROM.	Use Scenario: Remote verification of endpoint health in cloud-managed IoT edge devices deployed in utility substations. IC Role / Device Role / Timing Role: TPM generates signed quotes containing PCR values and nonce; host MCU forwards to cloud service for policy evaluation. Use Value: Enables zero-touch provisioning and automated compliance reporting using AT97SC3205T-G3M44-20's FIPS-certified SHA-1 and RSA signing capability.
Sealed Storage for Credentials	Hardware-Based Key Management
Use Scenario: Storing TLS private keys and device identity certificates in medical imaging equipment requiring HIPAA-compliant data protection. IC Role / Device Role / Timing Role: TPM encrypts credentials under its Storage Root Key (SRK) before writing to 2066-byte NV space; decryption occurs only after platform authorization. Use Value: Ensures private keys never leave AT97SC3205T-G3M44-20 boundary - mitigates extraction via memory dump or JTAG probing.	Use Scenario: Generating and protecting RSA key pairs used for secure firmware updates in railway signaling controllers. IC Role / Device Role / Timing Role: TPM executes on-device key generation using its FIPS-140-2 certified RNG and performs asymmetric signing/verification without exposing private keys. Use Value: Eliminates need for external HSM or secure element - all key lifecycle operations occur within AT97SC3205T-G3M44-20's physically secured silicon.

Secure Boot Authentication

Platform Integrity Attestation

Use Scenario: Verifying firmware signature and measuring boot sequence integrity during power-on self-test (POST) in industrial gateways.

IC Role / Device Role / Timing Role: TPM acts as root-of-trust anchor, storing PCR (Platform Configuration Register) values and signing measurement logs via RSA-2048.

Use Value: Prevents unauthorized firmware execution by binding boot measurements to hardware-bound keys stored in AT97SC3205T-G3M44-20's internal EEPROM.

Use Scenario: Remote verification of endpoint health in cloud-managed IoT edge devices deployed in utility substations.

IC Role / Device Role / Timing Role: TPM generates signed quotes containing PCR values and nonce; host MCU forwards to cloud service for policy evaluation.

Use Value: Enables zero-touch provisioning and automated compliance reporting using AT97SC3205T-G3M44-20's FIPS-certified SHA-1 and RSA signing capability.

Sealed Storage for Credentials

Hardware-Based Key Management

Use Scenario: Storing TLS private keys and device identity certificates in medical imaging equipment requiring HIPAA-compliant data protection.

IC Role / Device Role / Timing Role: TPM encrypts credentials under its Storage Root Key (SRK) before writing to 2066-byte NV space; decryption occurs only after platform authorization.

Use Value: Ensures private keys never leave AT97SC3205T-G3M44-20 boundary - mitigates extraction via memory dump or JTAG probing.

Use Scenario: Generating and protecting RSA key pairs used for secure firmware updates in railway signaling controllers.

IC Role / Device Role / Timing Role: TPM executes on-device key generation using its FIPS-140-2 certified RNG and performs asymmetric signing/verification without exposing private keys.

Use Value: Eliminates need for external HSM or secure element - all key lifecycle operations occur within AT97SC3205T-G3M44-20's physically secured silicon.

Equivalent & Alternatives

The following parts are listed as comparable options for similar TPM 1.2 security applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Infineon SLB9665TT2.0	Same TPM 1.2 compliance, SPI/I²C dual interface, but lacks AVR CPU - uses proprietary secure core; 32-pin QFN package identical footprint.	Supports SPI host interface (not available on AT97SC3205T-G3M44-20); higher max I²C speed (1 MHz vs. 400 kHz).	Select when SPI interface or faster I²C timing is required; verify GPIO mapping and tamper pin behavior differ.
NXP PCF5122A	TPM 2.0 compliant, not TPM 1.2; includes ECC acceleration; 32-pin QFN but different pinout - SM_DAT/SM_CLK relocated; no PP/GPIO pin.	Enables post-2016 TCG standards and elliptic-curve cryptography; incompatible with legacy TPM 1.2 host stacks.	Select only for new designs targeting TPM 2.0; not drop-in for AT97SC3205T-G3M44-20 due to protocol and pinout mismatch.

Compared with Infineon SLB9665TT2.0 and NXP PCF5122A, the AT97SC3205T-G3M44-20 offers proven TPM 1.2 compatibility with integrated AVR CPU for custom firmware extensions, while maintaining identical QFN-32 mechanical fit - making it optimal for industrial retrofits and long-lifecycle deployments where TCG 1.2 stack maturity is critical.

Availability

AT97SC3205T-G3M44-20 is available at Aetrix Electronics and suitable for industrial gateways, medical imaging systems, railway signaling controllers, and utility substation edge devices requiring stable component supply and long-term lifecycle assurance.

Supply support for AT97SC3205T-G3M44-20 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 manufacturing continuity for the AT97SC3205T series.

The AT97SC3205T-G3M44-20 belongs to Atmel's Trusted Platform Module family, designed specifically to deliver certified hardware-rooted security for embedded systems where firmware integrity, remote attestation, and cryptographic key protection are non-negotiable.

FAQ

What is the operating voltage range for the AT97SC3205T-G3M44-20?

The AT97SC3205T-G3M44-20 operates at a nominal supply voltage of 3.3 V with a tolerance of ±10%, meaning it functions reliably from 2.97 V to 3.63 V. This fixed-voltage requirement eliminates level-shifting complexity but mandates clean, well-decoupled power delivery - including 2200–4700 pF capacitors placed within 5 mm of each VCC pin and a 0.1 µF bulk capacitor no more than 10 mm from the device. The AT97SC3205T-G3M44-20 does not support dual-supply or wide-input voltage operation.

Does the AT97SC3205T-G3M44-20 support TPM 2.0?

No, the AT97SC3205T-G3M44-20 implements only the Trusted Computing Group (TCG) TPM 1.2 specification and is not compatible with TPM 2.0 commands, structures, or algorithms. It lacks support for ECC-based cryptographic operations, the new hierarchical key model, and the extended command set defined in TPM 2.0. For TPM 2.0 compliance, alternative devices such as the NXP PCF5122A or Infineon SLB9670 must be evaluated - but these require firmware and driver changes and are not pin- or functionally compatible with the AT97SC3205T-G3M44-20.

What are the I²C timing and pull-up requirements for reliable 400 kHz operation of the AT97SC3205T-G3M44-20?

For stable 400 kHz Fast Mode I²C operation, the AT97SC3205T-G3M44-20 requires a 800 Ω pull-up resistor on SM_DAT and a 1.5 kΩ pull-up on SM_CLK. The SM_CLK duty cycle must be as close to 50% as possible - deviation degrades timing margin significantly at 400 kHz. Signal routing must avoid crosstalk with noisy traces, and bus capacitance should remain below 400 pF. These values are empirically validated in Atmel's design notes and deviate from generic I²C guidelines due to the AT97SC3205T-G3M44-20's internal input thresholds and rise-time constraints.

How is tamper detection implemented on the AT97SC3205T-G3M44-20?

The AT97SC3205T-G3M44-20 implements tamper detection via the TestBI/GPIO/XTAMPER pin, which functions as an external tamper sensor input (XTAMPER) when configured in that mode. When asserted high, it triggers immediate zeroization of all sensitive cryptographic material (RSA keys, SRK, NV data) - a hardware-enforced response that cannot be blocked by firmware. This pin also serves as a general-purpose GPIO or test input; its tamper role is activated only when enabled via Atmel-specific TPM commands documented in the "Atmel Specific TPM Commands Reference Guide." The AT97SC3205T-G3M44-20 does not include internal voltage, temperature, or frequency sensors for passive tamper detection.

What is the purpose and behavior of the TWI_Wakeup# pins on the AT97SC3205T-G3M44-20?

The AT97SC3205T-G3M44-20 uses two dedicated TWI_Wakeup# pins (pins 7 and 22 in QFN-32) to recover from low-power deep-sleep mode entered via the TPM_DeepSleep command. Both pins must be pulsed low simultaneously to exit sleep - this dual-signal requirement prevents spurious wakeups. Pin 22 must be statically tied to either GND or VCC (directly or via 4.7 kΩ), while pin 7 may float or be tied to GND. This mechanism ensures deterministic wake behavior without relying on I²C bus activity, preserving power during extended idle periods in battery-backed or energy-constrained industrial systems.

AT97SC3205T-G3M44-20 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

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-G3M44-20 FAQ

1.How can I place an order for AT97SC3205T-G3M44-20 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT97SC3205T-G3M44-20 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-G3M44-20 reliable?

The price and inventory of AT97SC3205T-G3M44-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-G3M44-20 is usually 5 days.

3.What payment methods are accepted for AT97SC3205T-G3M44-20?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-G3M44-20 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT97SC3205T-G3M44-20?

AT97SC3205T-G3M44-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT97SC3205T-G3M44-20 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-G3M44-20?

For technical support, including AT97SC3205T-G3M44-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-G3M44-20 requirements.

6.How does Aetrix verify that AT97SC3205T-G3M44-20 is sourced from the original manufacturer or authorized distributors?

All AT97SC3205T-G3M44-20 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-G3M44-20 meets industry standards.

7.What is the process for return or replacement of AT97SC3205T-G3M44-20?

All AT97SC3205T-G3M44-20 units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-G3M44-20, 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-G3M44-20 part is unused and in its original packaging.

Return procedure for AT97SC3205T-G3M44-20:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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