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LDC1312 Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza LDC1312
Descripción Electrónicos  LDC1312, LDC1314 Multi-Channel 12-Bit Inductance to Digital Converter (LDC) for Inductive Sensing
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

LDC1312 Datasheet(HTML) 9 Page - Texas Instruments

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IN0A
IN0B
VDD
Core
GND
SCL
SDA
I
2C
CLKIN
ADDR
INTB
SD
Resonant
Circuit
Driver
IN1A
IN1B
Resonant
Circuit
Driver
IN0A
IN0B
VDD
GND
SCL
SDA
I
2C
CLKIN
ADDR
INTB
SD
Resonant
Circuit
Driver
IN3A
IN3B
Resonant
Circuit
Driver
fREF
fIN
Core
fREF
fIN
40 MHz
40 MHz
LDC1312, LDC1314
www.ti.com
SNOSCZ0 – DECEMBER 2014
7 Detailed Description
7.1 Overview
Conductive objects brought in contact with an AC electromagnetic (EM) field will induce field changes that can be
detected using a sensor such as an inductor. Conveniently, an inductor, along with a capacitor, can be used to
construct an L-C resonator, also known as an L-C tank, which can be used to produce an EM field. In the case of
an L-C tank, the effect of the field disturbance is an apparent shift in the inductance of the sensor, which can be
observed as a shift in the resonant frequency. Using this principle, the LDC1312/1314 is an inductance-to-digital
converter (LDC) that measures the oscillation frequency of an LC resonator. The device outputs a digital value
that is proportional to frequency. This frequency measurement can be converted to an equivalent inductance.
7.2 Functional Block Diagram
Figure 10. Block Diagrams for the LDC1312 (left) and LDC1314 (right)
The LDC1312/LDC1314 is composed of front-end resonant circuit drivers, followed by a multiplexer that
sequences through the active channels, connecting them to the core that measures and digitizes the sensor
frequency (fSENSOR). The core uses a reference frequency (fREF) to measure the sensor frequency. fREF is derived
from either an internal reference clock (oscillator), or an externally supplied clock. The digitized output for each
channel is proportional to the ratio of fSENSOR/fREF. The I2C interface is used to support device configuration and
to transmit the digitized frequency values to a host processor. The LDC can be placed in shutdown mode, saving
current, using the SD pin. The INTB pin may be configured to notify the host of changes in system status.
7.3 Feature Description
7.3.1 Clocking Architecture
Figure 11 shows the clock dividers and multiplexers of the LDC.
Copyright © 2014, Texas Instruments Incorporated
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