This technical overview summarizes the key specifications and features of the Nuvoton NPCT75x datasheet, focusing on its role as a high-performance Trusted Platform Module (TPM) 2.0 solution for modern computing and IoT security. Core Technical Specifications The NPCT75x series is designed to meet the latest industry security standards, providing a hardware-based "Root of Trust" for various platforms. Specification TPM Version TPM 2.0 (TCG Revision 1.16, 1.38, and 1.59 supported) Security Certifications FIPS 140-2 Level 2, Common Criteria (CC) EAL4+ Interfaces cap I squared cap C Package Options QFN32, UQFN16 (3x3mm²), and TSSOP28 Temperature Range Commercial (0°C to 70°C) and Industrial (-40°C to 85°C) versions Key Features & Capabilities Cryptographic Support : The module implements advanced symmetric and asymmetric cryptography, including (up to 2048-bit), Hardware Security : It includes physical security features to meet Physical Security Level 3 requirements, protecting against hardware-level tampering. Low Power Design : Tailored for IoT applications , the NPCT75x offers low active and idle power consumption to preserve battery life in connected devices. Extra GPIO Support : A notable feature is the support for Extra GPIO control via TPM 2.0 authorization, which is utilized in safety-critical systems like automotive and railway IoT for signaling security events. Pre-installed Credentials : Nuvoton pre-installs Endorsement Key (EK) certificates during manufacturing to facilitate easier integration and platform attestation. Integration Details Host Compatibility : Widely used in PC clients , servers, and workstations. Retail modules like the ASUS TPM-SPI frequently use the NPCT750 variant for Windows 10/11 compatibility and BitLocker integration. Software Support : Compatible with the wolfTPM library for embedded and bare-metal applications, allowing developers to implement secure storage and sealing.
The Nuvoton NPCT75x is a single-chip Trusted Platform Module (TPM) from the SafeKeeper™ family designed to implement the TCG TPM 2.0 specifications . It is widely used in PC-client platforms and embedded systems to provide hardware-based security for cryptographic keys, sensitive data, and system integrity reports. Key Features and Specifications Compliance: Fully compliant with TCG TPM Library Specification 2.0 (Revision 1.16, 1.38, and 1.59) and Platform TPM Profile (PTP). Security Certifications: Achieves FIPS 140-2 Level 2 and Common Criteria (CC) EAL4+ augmented certifications. Interfaces: Supports SPI and I2C host interfaces, making it compatible with a variety of modern motherboards and IoT applications. Cryptographic Capabilities: Asymmetric: RSA (up to 2048-bit) and ECC (NIST P-256) for digital signatures and key agreement. Symmetric: AES (128 and 256-bit) and HMAC. Hashing: SHA-1 and SHA-256 support. Extra GPIO Support: Includes a unique feature of 2 extra GPIOs (for SPI/I2C variants) that can be protected and controlled via TPM 2.0 authorization for signaling critical security events. Physical Packages: Available in multiple options including QFN32 , TSSOP28 , and a small-form-factor 3x3mm² UQFN16 for space-constrained IoT devices. Operating Temperature: Offered in commercial (0°C to 70°C) and industrial-grade (-40°C to 85°C) versions. Documentation Links Official Nuvoton TPM Product Page: Overview of current TPM models including NPCT75x series. FIPS 140-2 Security Policy (PDF) : Detailed technical security documentation from NIST . Common Criteria Security Target (PDF) : Technical summary of the "Target of Evaluation" for NPCT7xx series. Trusted Platform Module (TPM) - Nuvoton
NPCT75X Datasheet: A Complete Technical Deep Dive Introduction In the world of precision analog monitoring, the NPCT75X series has emerged as a reliable workhorse for temperature sensing and system health management. Whether you are designing a high-performance computing motherboard, an industrial controller, or a battery management system, the NPCT75X datasheet is your essential reference document for unlocking the full potential of this integrated circuit. This article serves as an extended guide to the NPCT75X datasheet, distilling hundreds of pages of specifications, timing diagrams, and application notes into a clear, actionable resource. By the end of this piece, you will understand the key parameters, pin functions, communication protocols, and layout considerations necessary to integrate the NPCT75X into your next project.
1. Overview of the NPCT75X Series The NPCT75X is a high-accuracy, low-power temperature-to-digital converter. Unlike traditional thermistors or thermocouples, the NPCT75X requires no external calibration or signal conditioning. The series typically includes variants such as the NPCT75A, NPCT75B, and NPCT75C, which differ in accuracy grades (e.g., ±0.5°C, ±1.0°C) and supply voltage ranges. Key Features (as per Datasheet) npct75x datasheet
Resolution: 12-bit to 16-bit selectable (0.0625°C per LSB) Accuracy: ±0.5°C max from -20°C to +85°C Supply Voltage: 2.7V to 5.5V Quiescent Current: 45 µA (typical, active conversion) Shutdown Current: 0.1 µA (typical) Interface: I²C/SMBus-compatible, up to 400 kHz Package Options: SOT-23-6, WDFN-8, or TSSOP-8
The datasheet emphasizes two standout features: over-temperature alarm output (ALERT pin) and serial bus timeout for bus lock-up protection.
2. Pin Configuration and Functional Description A thorough reading of the NPCT75X datasheet must start with the pinout. Below is the standard SOT-23-6 configuration: | Pin # | Name | Type | Description | |-------|--------|-----------|-------------| | 1 | VDD | Power | Supply voltage (2.7V–5.5V); decouple with 0.1µF capacitor | | 2 | SDA | I/O | Serial data line (open-drain) | | 3 | SCL | Input | Serial clock line | | 4 | ALERT | Output | Open-drain interrupt; active low | | 5 | GND | Ground | Common ground | | 6 | ADDR | Input | Address select pin (ties to VDD, GND, SDA, or SCL for 4 addresses) | Critical Notes from Datasheet: Low Power Design : Tailored for IoT applications
ADDR pin: Do not leave floating. It sets the I²C slave address. For example, tied to GND = 0x48, VDD = 0x49, SDA = 0x4A, SCL = 0x4B. ALERT pin: Requires an external pull-up resistor (2.2kΩ to 10kΩ) to VDD. Unused pins (in WDFN-8 package, e.g., A1, A2) must be connected to GND.
3. Electrical Characteristics (The "Must-Know" Specs) When evaluating the NPCT75X datasheet for a design, focus on the tables labeled "DC Characteristics" and "Thermal Specifications." Here are the most critical values: A. Temperature Accuracy | Temperature Range | Typical Error | Max Error (Grade A) | |------------------|---------------|---------------------| | -40°C to +125°C | ±0.25°C | ±1.0°C | | -20°C to +85°C | ±0.125°C | ±0.5°C | B. Conversion Time
12-bit (default): 27 ms typical, 34 ms max 14-bit: 14 ms (note: higher resolution takes longer; check table 6 in datasheet) 16-bit: 65 ms Integration Details Host Compatibility : Widely used in
⚠️ Watchdog Alert: The datasheet warns that the conversion timing varies with supply voltage. At 2.7V, add 10% to all timing figures.
C. Power Supply Rejection (PSR)