Mikroelektronika d.o.o.
Carte Click pour cellule de charge 2
Carte Click pour cellule de charge 2
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Overview
Le Load Cell 2 Click Board™ est un click de mesure de poids qui utilise un élément de cellule de charge, afin de mesurer avec précision le poids d'un objet. Le Load Cell 2 Click peut être utilisé avec les cellules de charge de type jauge de contrainte avec une plage de tension de référence différentielle externe de 0,1 V à 5 V. La cellule de charge à jauge de contrainte est généralement un circuit composé de quatre jauges de contrainte, connectées dans la configuration du pont de Wheatstone. De très petites variations de tension doivent être détectées avec précision et converties sous forme numérique. Le Load Cell 2 Click est basé sur le NAU7802, qui est un convertisseur analogique-numérique 24 bits, actionné via une simple commande I2C, de Nuvoton. Ce capteur possède de nombreuses fonctionnalités qui en font une solution parfaite pour les petites conceptions. L'une de ces caractéristiques est certainement son haut niveau d'intégration qui permet un nombre minimal de composants externes.
La carte Click Board™ Load Cell 2 est prise en charge par une bibliothèque compatible mikroSDK, qui comprend des fonctions qui simplifient le développement logiciel. Cette carte Click Board™ est un produit entièrement testé, prêt à être utilisé sur un système équipé de la prise mikroBUS™.
| General Information | |
|---|---|
Part Number (SKU) |
MIKROE-4047
|
Manufacturer |
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| Physical and Mechanical | |
Weight |
0.018 kg
|
| Other | |
Country of Origin |
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HS Code Customs Tariff code
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EAN |
8606018717118
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Warranty |
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How Does The Load Cell 2 Click Board™ Work?
The Load Cell 2 Click Board™ is based on the NAU7802 is a precision low-power 24-bit analog-to-digital converter (ADC), with an onboard low-noise programmable gain amplifier (PGA), onboard RC or Crystal oscillator, and a precision 24-bit sigma-delta (Σ-Δ) analog to digital converter (ADC). The NAU7802 device is capable of up to 23-bit ENOB (Effective Number Of Bits) performance. This device provides a complete front-end solution for bridge/sensor measurement such as in weigh scales, strain gauges, and many other high resolution, low sample rate applications.
The NAU7802 have many built-in features, which enable high performance applications with very low external parts count. Additionally, both operating current and standby current are very low, and many power management features are included. These enable powering only those elements of the chip that are needed, and also, to operate at greatly reduced power if the full 23-bit ENOB performance is not required.
The Programmable Gain Amplifier (PGA) provides selectable gains from 1 to 128. The A/D conversion is performed with a Sigma-Delta modulator and programmable FIR filter that provides a simultaneous 50Hz and 60Hz notch filter to effectively improve interference immunity. Also, this device provides a standard 2-wire interface compatible with I2C protocol for simple and straightforward connection to and interoperation with a wide range of possible host processors.
Calibration is not required for low accuracy applications, but may be needed in sensitive applications. When calibration is used the system designer has three options (details in NAU7802 datasheet).
The power supply is 3.3V and this allows only 3.3V MCUs to be interfaced with the Click boards™ directly.
SPECIFICATIONS
| Type | Force |
| Applications | NAU7802 provides a complete front-end solution for bridge/sensor measurement such as in weigh scales, strain gauges, and many other high resolution, low sample rate applications. |
| On-board modules | NAU7802 24-Bit Dual-Channel ADC For Bridge Sensors |
| Key Features | NAU7802 is a precision low-power 24-bit analog-to-digital converter (ADC), with an onboard low-noise programmable gain amplifier (PGA), onboard RC or Crystal oscillator, and a precision 24-bit sigma-delta (Σ-Δ) analog to digital converter (ADC) |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V |
PINOUT DIAGRAM
This table shows how the pinout of the Load Cell 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | RDY | Data Ready | |
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
Frequently Asked Questions
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