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Mikroelektronika d.o.o.

LDC1101 Click-Platine

LDC1101 Click-Platine

Induktivität-Digital-Umsetzer
SKU: MIKROE-3240
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£24.50 GBP ohne MwSt
Normaler Preis £35.00 GBP Verkaufspreis
£24.50 GBP ohne MwSt
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Key Features

Zwei unabhängige kerne, einer gibt 16-bit-induktivitäts- und impedanzdaten aus, der andere gibt 24-bit-induktivitätsdaten aus. der breite betriebsfrequenzbereich ermöglicht die erfassung vieler objektarten. zuverlässige erfassung auch in rauen umgebungen
Basierend auf dem ldc1101, einem integrierten hochauflösenden, schnellen induktivität-digital-wandler von texas instruments
Es kann zum schnellen zählen von objekten, erfassen der motordrehzahl, zum entwickeln verschiedener tasten, tastaturen und anderer arten von hmi-basierten anwendungen verwendet werden. durch die fähigkeit, sowohl impedanz- als auch induktivitätseigenschaften zu erfassen, ist es möglich, anwendungen zur metallzusammensetzung und metallerkennung zu entwickeln.

Overview

Das LDC1101 Click Board™ ist ein Induktivität-Digital-Konverter. Es wurde für eine Reihe verschiedener Anwendungen entwickelt, die auf induktiven Messungen basieren. Sie können es verwenden, um die Position, Drehung oder Bewegung eines Objekts zu erkennen. LDC1101 enthält den LDC1101, den integrierten, hochauflösenden, schnellen Induktivität-Digital-Konverter. Der Konverter ermöglicht die Messung sowohl der Induktivität als auch der Impedanz. Der schnelle Impedanz- + Induktivitätsmodus (RP+L) bietet separate 16-Bit-Messwerte für beide Parameter, während der hochauflösende Induktivitätsmodus (LHR) einen einzelnen Messwert mit einer Auflösung von 24 Bit bietet.

Es wird in einem Paket geliefert, das auch die MikroSDK-Software und eine Bibliothek mit allen Funktionen enthält. Das LDC1101 Click Board™ wird als vollständig getesteter und zugelassener Prototyp geliefert und ist somit ein zuverlässiges Gerät, das sofort auf der Entwicklungsplatine verwendet werden kann.

Featuring a wide LC sensor frequency range, LDC1101 is capable of sensing a broad range of conductive materials. Thanks to the inheritably accurate and robust sensing technology, it can do so even in harsh industrial environments. A programmable threshold-driven interrupt engine (adjustable during the run-time) allows the LTC1101 click to be used for high-speed object counting, motor speed sensing, for developing various buttons, keypads and other types of HMI-based applications. Finally, its ability to sense both impedance and inductance properties makes it possible to develop metal composition and metal detection applications.

How Does The LDS1101 Click Board™ Work?

The main component of the LDS1101 Click Board™ is a integrated high-resolution, high-speed inductance-to-digital converter, by Texas Instruments. This IC is a very versatile inductance converter, used for fast, short-range, contactless position, rotation, or motion of an object. Due to the used technology which allows very precise and reliable inductivity sensing even in harsh environments, the LDC1101 is well-suited to be used both in industrial and in automotive applications. The LDC1101 uses the standard SPI interface to be interfaced with the host MCU.

LDC1101 Click Board™

Two sensing cores work independently. One core offers a fast impedance and inductance (RP+L) readings with 16-bit resolution, while the other core offers high-resolution 24-bit readings of the inductance (LHR). While the RP+L is capable of running without the input clock, the LHR mode requires a clock signal at the CLKIN pin. Therefore, the CLKIN pin is routed to the mikroBUS™ PWM pin. Without the valid clock at this pin, the LHR mode will not be available.

The LDC 1101 offers two low power modes: Shutdown mode, and Sleep mode. In both modes, the IC does not actively run any conversions. While in the Shutdown mode, all the sections of the LDC1101 are turned off, so the least current is consumed. The logic section of the LDC1101 becomes active while in Sleep mode, and this mode is used to configure the working parameters. Configuring the IC is only valid when in Sleep mode. The Active mode uses the most power as the entire IC becomes operational.

The main working principle is based on measuring the parameters of the LC oscillator, formed by a PCB copper trace and a capacitor: when a conductive object approaches, it becomes magnetically coupled with the LC oscillator, driven by the LDC1101 IC. The LDC1101 then measures the amount of energy it needs to provide, in order to sustain the oscillation. The power loss of the oscillator circuit is proportional to the impedance of the conducting object, which is then sampled and becomes available as a digital value. Since the impedance value is affected by the distance of the object, it can be used to determine the object's distance from the LC oscillator. Similarly, having a fixed, known distance of the conductive object, and by measuring the impedance (and inductance) parameters, it is possible to determine its composition. The PCB copper trace becomes an impedance sensor in this case.

In the case when more accurate inductance sensing is required, the LHR mode is a better choice. Unlike the impedance, the inductivity of a conductive object is not affected by its temperature that much. By utilizing the ability of the LDC1101 to measure the resonant frequency of the LC oscillator it is also possible to accurately measure the distance of an object. The resonant frequency of the LC oscillator is affected by the conductive object which becomes magnetically coupled with it. The resonant frequency of the LC oscillator is a function of the inductance, so by measuring the change in the resonant frequency, it is possible to calculate the influence of the conductive object, and therefore to calculate its distance, very accurately. However, to use the LHR mode, an accurate clock signal is required on the mikroBUS™ PWM pin.

An integrated interrupt engine allows various events to be reported to the host MCU. For example, it is important to read the data before the result is corrupted by another conversion cycle. The interrupt can be triggered at the end of the conversion cycle for the RP+L mode, as well as for the LHR mode so that the MCU can fetch the data before the next conversion is started. The LDC1101 can also trigger an interrupt when a threshold is exceeded: if the conversion data is below or above the configured thresholds for both the inductance and the impedance parameters, an interrupt event will be triggered. Depending on the interrupt type, the INTB pin of the LDC1101 will be driven to a LOW logic level in case of an interrupt. This pin is multiplexed with the SDO pin, so there is a certain procedure to be followed when using this pin as the interrupt output: besides configuring the SDO/INTB pin as the interrupt pin, an onboard SMD jumper needs to be switched to the appropriate position, routing the interrupt signal to the INT pin of the mikroBUS™.

SPECIFICATIONS

Type Inductance
Applications It can be used for high-speed object counting, motor speed sensing, for developing various buttons, keypads and other types of HMI-based applications. Utilizing the ability to sense both impedance and inductance properties, it is possible to develop metal composition and metal detection applications.
On-board modules LDC1101, an integrated high-resolution, high-speed inductance-to-digital converter, by Texas Instruments
Key Features Two independent cores, one that outputs 16-bit inductance and impedance data, and the other that outputs 24-bit inductance data. Wide operating frequency range allows many kinds of objects to be sensed. Reliable sensing even in harsh environments
Interface SPI
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)
Input Voltage 3.3V

PINOUT DIAGRAM

This table shows how the pinout on LDC1101 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
NC 1 AN PWM 16 PWM Clock Signal IN
NC 2 RST INT 15 INT Interrupt
SPI chip CS 3 CS RX 14 NC
SPI Serial Data Clock SCK 4 SCK TX 13 NC
SPI Serial Data OUT SDO 5 MISO SCL 12 NC
SPI Serial Data IN SDI 6 MOSI SDA 11 NC
Power supply 3V3 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
JP1 MODE SEL Left SDO/INTB pin mode selection: left position (SDO) - SPI Serial Data OUT on SDO pin, right position (INTB) - interrupt reporting on the INT pin

 

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