My Inquiry
My Account
Microchip Technology AT97SC3205T-H3M4420B
- Part No.:
- AT97SC3205T-H3M4420B
- Manufacturer:
- Microchip Technology
- Category:
- Application Specific Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
AT97SC3205T-H3M4420B.pdf
- Description:
- PROD STD IND I2C TPM 4X4 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,692
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT97SC3205T-H3M4420B from Microchip (acquired Atmel) is a TCG-compliant Trusted Platform Module implementing TPM 1.2 specification, featuring an AVR RISC microprocessor, hardware RSA crypto engine, FIPS-140-2 certified RNG/AES/SHA/HMAC engines, and 2066-byte NV user storage. It operates at 3.3V with I²C interface up to 400 kHz and supports industrial temperature range (–40°C to +85°C).
For engineers reviewing the AT97SC3205T-H3M4420B datasheet, AT97SC3205T-H3M4420B pinout, AT97SC3205T-H3M4420B application, or AT97SC3205T-H3M4420B equivalent, this page delivers verified package mapping (32-pad QFN), confirmed I²C timing constraints, GPIO-Express-00 and PP/GPIO functional roles, TWI_Wakeup# deep-sleep recovery behavior, and FIPS-140-2 module certification scope.
Technical Context
The AT97SC3205T-H3M4420B integrates a dedicated AVR 8-bit RISC CPU with on-chip EEPROM for RSA key storage and SRAM for runtime operations. Its cryptographic subsystem includes hardware-accelerated RSA, SHA-1, HMAC-SHA1, AES-128, and a FIPS-140-2 validated PRNG used for both TCG protocol functions and system-level random number generation.
Communication occurs exclusively via I²C (SM_DAT/SM_CLK) supporting 100 kHz standard mode and 400 kHz fast mode with defined pull-up requirements (800 Ω on SM_DAT, 1.5 kΩ on SM_CLK). The device implements low-power sleep recovery using dual TWI_Wakeup# pins and supports hardware physical presence assertion via the PP/GPIO pin with internal pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TCG Compliance | TPM 1.2 specification compliant - enables standardized secure boot, attestation, and sealed storage in PC/embedded platforms. |
| I²C Interface Speed | Up to 400 kHz fast mode - requires precise 800 Ω pull-up on SM_DAT and 1.5 kΩ on SM_CLK for stable high-speed operation. |
| Supply Voltage | 3.3 V ±10% - mandates tight decoupling: 2200–4700 pF caps <5 mm from each VCC–GND pair plus 0.1 µF at VCC node <10 mm away. |
| NV User Storage | 2066 bytes - allocated for customer-defined persistent data, accessible via TPM_NV_Write/TPM_NV_Read commands. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating; thermal design must accommodate full-range junction stability. |
| FIPS Certification | FIPS-140-2 Level 2 certified module - covers RNG, HMAC, AES, SHA, and RSA engines; validates cryptographic integrity for regulated deployments. |
| Package Type | 32-pad QFN (32M3), 4.0 × 4.0 × 0.90 mm, 0.40 mm pitch - exposes GND center pad tied internally to ground; requires solder paste stencil optimization for thermal reliability. |
Pinout & Package
AT97SC3205T-H3M4420B uses the 32-pad Very Thin QFN (32M3) package: 4.0 × 4.0 mm body, 0.40 mm pitch, exposed GND center pad internally connected to ground. Pin assignments are identical across all variants in the AT97SC3205T family per official Atmel documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.3 V main supply; requires localized 2200–4700 pF decoupling <5 mm to adjacent GND and global 0.1 µF cap <10 mm at VCC node. |
| GND | Ground reference | System ground return; center pad is electrically tied to internal GND - recommended for PCB thermal and electrical grounding. |
| SM_DAT | I²C bidirectional data line | Open-drain I²C data; requires external 800 Ω pull-up for reliable 400 kHz operation; supports TCG command framing and response payloads. |
| SM_CLK | I²C clock input | Input-only I²C clock; requires external 1.5 kΩ pull-up and near-50% duty cycle for optimal signal integrity at 400 kHz. |
| PP/GPIO | Hardware physical presence / GPIO | Active-high physical presence indicator with internal pull-down; defaults to GPIO input; asserts platform authorization for sensitive TPM operations. |
| GPIO-Express-00 | Dedicated NV-mapped GPIO | Maps to TPM_NV_INDEX_GPIO_00; internal pull-up enabled; serves as XOR chain output during I/O test mode; leave floating if unused. |
| TWI_Wakeup# | Deep-sleep recovery trigger | Two active-low pins (TSSOP pin 7 & 22, QFN pin 7 & 22); both must be pulsed low to exit TPM_DeepSleep state. |
| PIRQ# | Interrupt request output | Open-drain interrupt signal asserted by TPM to host processor upon event completion or error; requires external pull-up resistor. |
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 coordination, reduces BOM count and board area. |
| FIPS-140-2 Level 2 certification | Covers RNG, HMAC, AES, SHA, and RSA engines - satisfies compliance requirements for government, finance, and healthcare embedded systems. |
| Hardware asymmetric crypto engine | Accelerates RSA key generation, signing, and verification - offloads computationally intensive operations from host CPU and prevents software-side timing attacks. |
| Internal EEPROM for RSA keys | Stores multiple RSA key pairs securely within tamper-resistant silicon - eliminates need for external secure memory and simplifies key lifecycle management. |
| 2066-byte NV user storage | Provides persistent, authenticated storage space for firmware configuration, device identity tokens, or audit logs - accessible only via authorized TPM_NV commands. |
Applications
| Secure Boot Authentication | Platform Integrity Attestation |
|---|---|
Use Scenario: Verifying firmware image authenticity before execution in industrial gateways and medical edge devices. IC Role / Device Role / Timing Role: TPM performs SHA-1 hashing and RSA signature verification of boot firmware blocks using keys stored in internal EEPROM. Use Value: Prevents unauthorized firmware modification by cryptographically binding boot sequence to hardware-rooted keys - no host CPU involvement required for core verification logic. | Use Scenario: Reporting runtime system state (e.g., OS kernel hash, driver list) to remote management servers in enterprise servers. IC Role / Device Role / Timing Role: TPM generates signed quotes containing PCR values and nonce via TPM_Quote command; uses HMAC-SHA1 for message authentication. Use Value: Enables verifiable proof that platform configuration matches policy - leverages FIPS-certified HMAC engine and hardware-bound key protection. |
| Hardware-Based Key Sealing | Physical Presence Enforcement |
Use Scenario: Storing encrypted credentials (e.g., Wi-Fi PSK, TLS private key) in NV storage, bound to current platform configuration. IC Role / Device Role / Timing Role: TPM seals data using PCR values and encrypts with internal RSA key; unsealing fails if PCR values change post-boot. Use Value: Ensures credential confidentiality and integrity across reboots - relies on hardware-enforced binding between data and measured platform state. | Use Scenario: Requiring physical button press to authorize BIOS updates or TPM owner clear in kiosk terminals and ATMs. IC Role / Device Role / Timing Role: PP/GPIO pin detects hardware switch closure; TPM enforces physical presence flag before executing TPM_PhysicalPresence command. Use Value: Mitigates remote privilege escalation by enforcing out-of-band human confirmation - implemented via dedicated pin with internal pull-down and TCG-defined protocol flow. |
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 | Also TPM 1.2 compliant, 32-pin QFN, 3.3 V, I²C interface; lacks AVR CPU - uses proprietary secure core; FIPS-140-2 Level 2 certified but RNG implementation differs. | Same use cases (secure boot, attestation), but requires different driver stack due to non-AVR firmware architecture and register map. | Select when prioritizing Infineon's long-term supply commitment and broader automotive qualification; verify compatibility with existing TPM stack abstraction layer. |
| Nuvoton NPCT650YAXX | TPM 1.2, 32-pin QFN, 3.3 V, I²C; integrates ARM Cortex-M0+ instead of AVR; includes additional GPIOs and configurable wake sources not present in AT97SC3205T-H3M4420B. | Supports more complex host-side power management scenarios via extended GPIO control; requires updated HAL for M0+ register access and interrupt handling. | Choose for new designs needing enhanced host interaction flexibility and future-proofing toward TPM 2.0 migration paths; confirm bootloader integration with M0+ vector table layout. |
Compared with SLB9665TT2.0 and NPCT650YAXX, the AT97SC3205T-H3M4420B offers AVR-based firmware transparency and tightly integrated EEPROM key storage, while differing in core architecture and GPIO feature set - selection depends on legacy stack alignment, certification traceability, and host processor interface requirements.
Availability
AT97SC3205T-H3M4420B is available at Aetrix Electronics and suitable for secure boot authentication, platform integrity attestation, hardware-based key sealing, and physical presence enforcement requiring stable component supply across industrial and enterprise embedded programs.
Supply support for AT97SC3205T-H3M4420B 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 belongs to Atmel's Trusted Platform Module product line, designed specifically to deliver TCG-compliant hardware root-of-trust for embedded systems where firmware integrity, remote attestation, and cryptographic key protection are mandatory.
FAQ
What is the primary function of the AT97SC3205T-H3M4420B in a secure system?
The AT97SC3205T-H3M4420B serves as a hardware root-of-trust implementing the TCG TPM 1.2 specification. It provides cryptographic services including RSA key generation and signing, SHA-1 hashing, HMAC authentication, and secure NV storage - all within a FIPS-140-2 Level 2 certified module. Its role is to ensure platform integrity, enable secure boot, and protect sensitive keys from software extraction.
Does the AT97SC3205T-H3M4420B support both commercial and industrial temperature ranges?
Yes, the AT97SC3205T-H3M4420B is qualified for industrial temperature operation from –40°C to +85°C. This rating is explicitly confirmed in the official Atmel ordering information and applies to the H3M4420B variant, which uses the 32-pad QFN package. No derating is required across this full range.
How does the TWI_Wakeup# functionality work on the AT97SC3205T-H3M4420B?
The AT97SC3205T-H3M4420B uses two dedicated TWI_Wakeup# pins (QFN pins 7 and 22) to recover from deep-sleep mode. Both pins must be pulsed low simultaneously to exit the low-power state initiated by the TPM_DeepSleep command. If unused, pin 7 may float or tie to GND; pin 22 must be tied to GND or VCC.
What are the I²C pull-up resistor requirements for reliable 400 kHz operation of the AT97SC3205T-H3M4420B?
For stable 400 kHz I²C communication, the AT97SC3205T-H3M4420B requires an 800 Ω pull-up resistor on SM_DAT and a 1.5 kΩ pull-up on SM_CLK. These values are empirically validated in the datasheet summary; deviations may cause timing violations or bus arbitration failures at maximum speed.
Is the internal EEPROM in the AT97SC3205T-H3M4420B used exclusively for RSA keys?
No - the internal EEPROM in the AT97SC3205T-H3M4420B stores RSA key pairs and firmware-related TCG objects, while the separate 2066-byte NV user storage (accessible via TPM_NV commands) is reserved for application-defined data. Both are physically isolated and protected by distinct access controls enforced in hardware.
AT97SC3205T-H3M4420B 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (4x4)
AT97SC3205T-H3M4420B FAQ
1.How can I place an order for AT97SC3205T-H3M4420B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT97SC3205T-H3M4420B 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-H3M4420B reliable?
The price and inventory of AT97SC3205T-H3M4420B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT97SC3205T-H3M4420B is usually 5 days.
3.What payment methods are accepted for AT97SC3205T-H3M4420B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT97SC3205T-H3M4420B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT97SC3205T-H3M4420B?
AT97SC3205T-H3M4420B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT97SC3205T-H3M4420B 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-H3M4420B?
For technical support, including AT97SC3205T-H3M4420B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT97SC3205T-H3M4420B requirements.
6.How does Aetrix verify that AT97SC3205T-H3M4420B is sourced from the original manufacturer or authorized distributors?
All AT97SC3205T-H3M4420B 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-H3M4420B meets industry standards.
7.What is the process for return or replacement of AT97SC3205T-H3M4420B?
All AT97SC3205T-H3M4420B units undergo pre-shipment inspection (PSI). If there is an issue with AT97SC3205T-H3M4420B, 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-H3M4420B part is unused and in its original packaging.
Return procedure for AT97SC3205T-H3M4420B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT97SC3205T-H3M4420B 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…
