LDC1312 Datasheet, PDF (1/57 Pages) Texas Instruments – Multi-Channel 12-Bit Inductance to Digital Converter (LDC) for Inductive Sensing

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LDC1312, LDC1314
SNOSCZ0 – DECEMBER 2014
LDC1312, LDC1314 Multi-Channel 12-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
• 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
LDC1312
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 LDC1312 and LDC1314 are 2- and 4-channel,
12-bit inductance to digital converters (LDCs) for
inductive sensing solutions. With multiple channels
and support for remote sensing, the LDC1312 and
LDC1314 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 LDC1312 and LDC1314 offer well-matched
channels, which allow for differential and ratiometric
measurements. This enables 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
on existing sensing solutions and to introduce brand
new sensing capabilities to products in all markets,
especially consumer and industrial applications.
Inductive sensing offers better performance,
reliability, and flexibility than competitive sensing
technologies at lower system cost and power.
The LDC1312 and LDC1314 are easily configured via
an I2C interface. The two-channel LDC1312 is
available in a WSON-12 package and the four-
channel LDC1314 is available in a WQFN-16
package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LDC1312
WSON-12
4 mm × 4 mm
LDC1314
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
2.5
2.25
2
1.75
1.5
1.25
1
0.75
0.5
0.25
0
0
10% 20% 30% 40% 50% 60%
Sensing Range (Target Distance / WSENSOR)
70%
D001
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.