LDC1612_15 Datasheet, PDF (1/58 Pages) Texas Instruments – LDC1612, LDC1614 Multi-Channel 28-Bit Inductance to Digital Converter (LDC) for Inductive Sensing

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LDC1612, LDC1614
SNOSCY9 – DECEMBER 2014
LDC1612, LDC1614 Multi-Channel 28-Bit Inductance to Digital Converter (LDC) for
Inductive Sensing
1 Features
•1 Easy-to-use – minimal configuration required
• Measure up to 4 sensors with one IC
• Multiple channels support environmental and
aging compensation
• Multi-channel remote sensing provides lowest
system cost
• Pin-compatible medium and high-resolution
options
– LDC1312/4: 2/4-ch 12-bit LDC
– LDC1612/4: 2/4-ch 28-bit LDC
• Sensing range beyond two coil diameters
• Supports wide sensor frequency range of 1kHz to
10MHz
• Power consumption:
– 35 µA Low Power Sleep Mode
– 200 nA Shutdown Mode
• 3.3V operation
• Support internal or external reference clock
• Immune to DC magnetic fields and magnets
2 Applications
• Knobs in consumer, appliances, and automotive
• Linear and rotational encoders
• Buttons in home electronics, wearables,
manufacturing, and automotive
• Keypads in manufacturing and appliances
• Slider buttons in consumer products
• Metal detection in industrial and automotive
• POS and EPOS
• Flow meters in consumer and appliances
Simplified Schematic
40 MHz
CLKIN
Target
Sensor 0
IN0A
IN0B
Target
Sensor 1
IN1A
IN1B
GND
LDC1612
3.3 V
VDD
SD
INTB
3.3 V
GPIO
GPIO
MCU
VDD
Core
SDA
I²C
SCL
ADDR
3.3 V
I²C
Peripheral
GND
3 Description
The LDC1612 and LDC1614 are 2- and 4-channel,
28-bit inductance to digital converters (LDCs) for
inductive sensing solutions. With multiple channels
and support for remote sensing, the LDC1612 and
LDC1614 enable the performance and reliability
benefits of inductive sensing to be realized at minimal
cost and power. The products are easy to use, only
requiring that the sensor frequency be within 1 kHz
and 10 MHz to begin sensing. The wide 1 kHz to 10
MHz sensor frequency range also enables use of
very small PCB coils, further reducing sensing
solution cost and size.
The high resolution channels allow for a much larger
sensing range, maintaining good performance
beyond two coil diameters. Well-matched channels
allow for differential and ratiometric measurements,
which enable designers to use one channel to
compensate their sensing for environmental and
aging conditions such as temperature, humidity, and
mechanical drift.
Given their ease of use, low power, and low system
cost these products enable designers to greatly
improve performance, reliability, and flexibility over
existing sensing solutions and to introduce brand new
sensing capabilities to products in all markets,
especially consumer and industrial applications.
These devices are easily configured via an I2C
interface. The two-channel LDC1612 is available in a
WSON-12 package and the four-channel LDC1614 is
available in a WQFN-16 package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LDC1612
WSON-12
4 mm × 4 mm
LDC1614
WQFN-16
4 mm × 4 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Measurement Precision vs. Target Distance
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
20%
40%
60%
80%
Sensing Range (Target Distance / WSENSOR)
100%
D002
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.