My Inquiry
My Account
Microchip Technology AT97SC3205T-X3A1C20B
- Part No.:
- AT97SC3205T-X3A1C20B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT97SC3205T-X3A1C20B.pdf
- Description:
- FF COM I2C TPM 4.4MM TSSOP SEK
- Quantity:
- Payment:
- Shipping:
Inventory:522
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT97SC3205T-X3A1C20B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module (TPM) 1.2 security IC implementing hardware-based asymmetric cryptography, FIPS-140-2 certified RNG/AES/SHA/RSA engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface (400kHz Fast Mode), housed in 28-pin Thin TSSOP package for embedded platform root-of-trust applications.
For engineers reviewing the AT97SC3205T-X3A1C20B datasheet, AT97SC3205T-X3A1C20B pinout, AT97SC3205T-X3A1C20B application, or AT97SC3205T-X3A1C20B equivalent, key selection criteria include TPM 1.2 compliance, I²C timing constraints (SM_DAT/SM_CLK pull-up guidance), GPIO-Express-00 mapping to TPM_NV_INDEX_GPIO_00, low-power TWI_Wakeup# recovery sequence, and industrial temperature support (-40°C to +85°C).
Technical Context
The AT97SC3205T-X3A1C20B integrates an AVR® 8-bit RISC microprocessor with dedicated crypto hardware - including FIPS-140-2 validated RNG, HMAC, AES, SHA, and RSA engines - enabling secure key generation, storage, and cryptographic operations without host CPU involvement. Its internal EEPROM stores RSA keys and supports dynamic key cache management via TCG commands like TPM_FlushSpecific and TPM_LoadKey2.
Communication occurs exclusively over I²C (SM_DAT/SM_CLK), with strict layout requirements: SM_DAT pull-up ≤800Ω and SM_CLK pull-up ≤1.5kΩ for stable 400kHz operation, plus decoupling capacitors (2200–4700pF near each VCC pin, 0.1μF at VCC node) to ensure noise immunity and reliable reset behavior during power stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification compliant - enables standardized firmware/hardware trust anchor integration in PC, server, and embedded BIOS/UEFI stacks. |
| I²C Interface | 400kHz Fast Mode / 100kHz Standard Mode - requires precise pull-up sizing (SM_DAT ≤800Ω, SM_CLK ≤1.5kΩ) and 50% duty cycle clock for stable communication. |
| Supply Voltage | 3.3V ±5% - mandates tight decoupling: 2200–4700pF caps <5mm from each VCC-GND pair, plus 0.1μF cap <10mm at VCC node junction. |
| NV Storage | 2066 bytes user-defined data space - mapped via TPM_NV_INDEX_GPIO_00 for GPIO-Express-00, enabling persistent configuration or credential storage. |
| Operating Temp | -40°C to +85°C industrial range - validated for extended thermal cycling in network appliances, industrial controllers, and edge gateways. |
| FIPS Certification | FIPS-140-2 Level 2 certified module - covers RNG, HMAC, AES, SHA, and RSA engines, satisfying government and regulated-sector cryptographic validation requirements. |
| Package | 28-pin Thin TSSOP (4.4 × 9.7 mm, 0.65 mm pitch) - RoHS-compliant, lead-free, with NC pins (5, 12–15, 27–28) configurable as GND/VCC/floating. |
Pinout & Package
AT97SC3205T-X3A1C20B uses a 28-pin Thin TSSOP package (4.4 mm × 9.7 mm body, 0.65 mm pitch), RoHS-compliant and lead-free. Pin 1 is marked by a dot; substrate pad is not present in TSSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | 3.3V main supply requiring localized decoupling (2200–4700pF <5mm to adjacent GND); multiple VCC pins enable distributed power delivery. |
| GND | Ground Reference | System ground return path; adjacent placement to VCC pins critical for low-impedance decoupling and noise suppression. |
| LRESET# | Active-Low Reset | Asynchronous reset input; minimum 2μs pulse width required; must remain asserted until VCC stabilizes post-power-up. |
| SM_DAT | I²C Data Line | Bidirectional open-drain I²C data; pull-up ≤800Ω required for reliable 400kHz operation; sensitive to trace capacitance and noise coupling. |
| SM_CLK | I²C Clock Line | Input-only I²C clock; pull-up ≤1.5kΩ recommended; 50% duty cycle improves timing margin at max speed. |
| GPIO-Express-00 | TPM-NV Mapped GPIO | Hardwired to TPM_NV_INDEX_GPIO_00; internal pull-up; floats when unused; used for persistent state signaling or tamper flag storage. |
| PP/GPIO | Physical Presence Indicator | Hardware physical presence signal (active-high); internal pull-down; floats when unused; enables BIOS-level admin override enforcement. |
| TWI_Wakeup# | Low-Power Recovery | Paired active-low signal (pins 7 & 22) required to exit deep sleep; both must be pulsed low simultaneously per TPM_DeepSleep command. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Asymmetric Crypto Engine | Offloads RSA key generation, signing, and encryption from host CPU - reduces latency and eliminates software-side private key exposure. |
| FIPS-140-2 Certified RNG | Validated entropy source feeding all cryptographic operations - satisfies NIST SP 800-90A/B/C requirements for key derivation and protocol randomness. |
| Internal EEPROM Key Storage | Dedicated non-volatile memory for RSA keys - prevents extraction via memory dump; access controlled exclusively through TPM command interface. |
| GPIO-Express-00 Mapping | Direct NV index binding enables atomic read/write of critical flags (e.g., secure boot status) without host driver intervention or OS dependency. |
| Industrial Temperature Range | Guaranteed operation from -40°C to +85°C - qualified for deployment in uncontrolled environments such as factory automation PLCs and outdoor telecom nodes. |
Applications
| Server Boot Integrity | Industrial PLC Security |
|---|---|
Use Scenario: Verifying firmware signature and measuring boot components before OS load in rack-mounted servers. IC Role / Device Role / Timing Role: Root-of-trust anchor performing SHA-1/SHA-256 hashing and RSA signature verification during Power-On Self-Test (POST). Use Value: Prevents unauthorized firmware modification by cryptographically attesting boot sequence integrity - enforced before any code execution begins. | Use Scenario: Securing firmware updates and runtime parameter configuration in programmable logic controllers deployed on factory floors. IC Role / Device Role / Timing Role: Secure credential vault and cryptographic service provider for encrypted OTA updates and authenticated HMI access. Use Value: Enables tamper-evident logging and signed firmware validation - meeting IEC 62443-3-3 SL2 requirements for industrial control systems. |
| Network Appliance TPM | Embedded Gateway Authentication |
Use Scenario: Providing hardware-backed identity and TLS key storage in enterprise firewalls and SD-WAN edge devices. IC Role / Device Role / Timing Role: Dedicated TPM 1.2 endpoint handling certificate enrollment, key wrapping, and attestation reporting over I²C. Use Value: Isolates private key material from main SoC - mitigates side-channel and software exploit risks during PKI operations. | Use Scenario: Authenticating device identity and establishing secure MQTT/TLS sessions in smart grid gateways operating in remote substations. IC Role / Device Role / Timing Role: Trust anchor managing device certificates, secure boot logs, and hardware-bound symmetric keys for sensor data encryption. Use Value: Ensures end-to-end chain-of-trust from sensor node to cloud - satisfying NISTIR 7628 Rev. 2 cybersecurity guidelines for energy infrastructure. |
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 secure MCU with TPM 1.2 stack; 32-pin QFN; supports SPI/I²C; lacks AVR core and GPIO-Express-00 NV mapping. | Requires SPI host interface adaptation; no direct GPIO-Express-00 equivalent - NV storage accessed via generic TPM_NV_DefineSpace. | Select when SPI interface is preferred or ARM-based firmware ecosystem already exists; verify I²C timing compatibility if retaining same bus. |
| SLB9670TT20I | Infineon OPTIGA™ TPM with TPM 2.0 support; 32-pin QFN; includes ECC acceleration; no AVR core; different I²C address and command set. | TPM 2.0 protocol stack incompatible with legacy TPM 1.2 BIOS/firmware; requires full stack migration and qualification. | Choose only for new designs targeting TPM 2.0 compliance; not suitable as drop-in replacement for AT97SC3205T-X3A1C20B in existing TPM 1.2 deployments. |
Compared with ST33HTPH2Z2AI0 and SLB9670TT20I, the AT97SC3205T-X3A1C20B offers native TPM 1.2 compliance with integrated AVR processor, GPIO-Express-00 NV indexing, and verified 400kHz I²C timing - making it optimal for cost-sensitive, firmware-constrained embedded platforms requiring minimal host intervention.
Availability
AT97SC3205T-X3A1C20B is available at Aetrix Electronics and suitable for server boot integrity, industrial PLC security, and network appliance TPM applications requiring stable component supply, long-term lifecycle assurance, and industrial temperature grade performance.
Supply support for AT97SC3205T-X3A1C20B 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, delivering secure microcontrollers, TPMs, and cryptographic solutions for industrial, communications, and computing markets.
The AT97SC3205T-X3A1C20B belongs to Atmel's TPM security IC family, designed specifically to provide hardware-rooted trust for embedded systems requiring TCG-compliant platform integrity, secure key storage, and FIPS-validated cryptographic services.
FAQ
What is the primary compliance standard met by the AT97SC3205T-X3A1C20B?
The AT97SC3205T-X3A1C20B is fully compliant with the Trusted Computing Group (TCG) Trusted Platform Module (TPM) Version 1.2 Specification. It implements all mandatory TCG 1.2 commands and protocols, including PCR extension, key hierarchy management, and sealed storage. This compliance enables interoperability with industry-standard BIOS/UEFI implementations and Windows BitLocker, Linux tpm-tools, and other TCG-aware software stacks. The AT97SC3205T-X3A1C20B does not support TPM 2.0.
How does the AT97SC3205T-X3A1C20B handle secure key storage and protection?
The AT97SC3205T-X3A1C20B stores RSA private keys in internal EEPROM that is inaccessible outside the TPM boundary - keys cannot be read out, only used for signing or decryption under strict authorization policies. All cryptographic operations occur within the hardened crypto engine, isolated from the host processor. The AT97SC3205T-X3A1C20B also features FIPS-140-2 Level 2 certified RNG, HMAC, AES, SHA, and RSA engines, ensuring keys are generated and processed in a validated, tamper-resistant environment.
What are the I²C interface requirements for reliable operation of the AT97SC3205T-X3A1C20B at 400kHz?
For stable 400kHz Fast Mode I²C operation, the AT97SC3205T-X3A1C20B requires SM_DAT pull-up ≤800Ω and SM_CLK pull-up ≤1.5kΩ, with clock duty cycle as close to 50% as possible. Signal integrity depends on minimizing trace capacitance and noise coupling; decoupling capacitors (2200–4700pF) must be placed <5mm between each VCC and adjacent GND pin. The AT97SC3205T-X3A1C20B supports Standard Mode (100kHz) as fallback if timing margins are insufficient at full speed.
What is the function and usage guidance for the GPIO-Express-00 pin on the AT97SC3205T-X3A1C20B?
The GPIO-Express-00 pin on the AT97SC3205T-X3A1C20B is hard-mapped to TPM_NV_INDEX_GPIO_00, enabling direct NV storage access for application-specific flags or state variables. It features an internal pull-up resistor and defaults to GPIO input mode. When unused, it should be left floating - no external biasing is required. The AT97SC3205T-X3A1C20B leverages this pin to simplify persistent state management without host-side driver complexity or additional NV memory.
Does the AT97SC3205T-X3A1C20B support low-power operation, and how is wake-up managed?
Yes, the AT97SC3205T-X3A1C20B enters low-power sleep automatically when idle and supports deep sleep via the TPM_DeepSleep command. Recovery requires simultaneous active-low pulses on both TWI_Wakeup# pins (TSSOP pins 7 and 22). This dual-signal requirement prevents spurious wake-ups and ensures deterministic resume behavior. The AT97SC3205T-X3A1C20B does not support single-pin wake-up or interrupt-driven wake events outside this defined sequence.
AT97SC3205T-X3A1C20B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 28-TSSOP
AT97SC3205T-X3A1C20B FAQ
1.How can I place an order for AT97SC3205T-X3A1C20B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-X3A1C20B 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-X3A1C20B reliable?
The price and inventory of AT97SC3205T-X3A1C20B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-X3A1C20B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-X3A1C20B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-X3A1C20B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-X3A1C20B?
AT97SC3205T-X3A1C20B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-X3A1C20B 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-X3A1C20B?
For technical support, including AT97SC3205T-X3A1C20B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-X3A1C20B requirements.
6.How does Aetrix verify that AT97SC3205T-X3A1C20B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-X3A1C20B 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-X3A1C20B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-X3A1C20B?
All AT97SC3205T-X3A1C20B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-X3A1C20B, 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-X3A1C20B part is unused and in its original packaging.
Return procedure for AT97SC3205T-X3A1C20B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-X3A1C20B 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
