LDC1041 Datasheet, PDF (1/33 Pages) Texas Instruments – 8-bit Rp, 24-bit L Inductance-to-Digital Converter with SPI

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LDC1041
SNOSCY1 – MARCH 2014
LDC1041: 8-bit Rp, 24-bit L Inductance-to-Digital Converter with SPI
1 Features
•1 Remote sensor placement (decoupling the LDC
from harsh environments)
• High durability (by virtue of contactless operation)
• Higher flexibility for system design (using coils or
springs as sensors)
• Insensitive to non-conductive environmental
interferers (such as dirt, dust, oil etc.)
• Magnet-free operation
• Sub-micron precision
• Supply Voltage: 5 V, typ
• Supply voltage, IO: 1.8V to 5.5V
• Stand-by current: 250uA, typ
• Rp resolution: 8-bit
• L resolution: 24-bit
• LC frequency range: 5kHz to 5MHz
2 Applications
• Level sensing
• Proximity sensing
• Spring motion sensing
• Lateral and angular position sensing
• Metal composition detection
3 Description
Inductive sensing is a contactless, short-range
sensing technology enabling high-resolution and low-
cost position sensing of conductive targets, even in
harsh environments. Using a coil or spring as a
sensor, the LDC1041 inductance-to-digital converter
provides system designers a way to achieve high
performance and reliability at a lower system cost
than other competing solutions.
The LDC1041 is pin compatible with the LDC1000
(16-bit Rp/24-bit L) and the LDC1051 (8-bit Rp). This
family of devices offers system designers different
resolution options based on their application and
system requirements.
The LDC1041 is available in a 5mm x 4mm WSON-
16 package. Device programming via SPI allows for
easy configuration using a microcontroller.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
LDC1041NHRT
WSON (16)
5 mm × 4 mm
LDC1041NHRR
WSON (16)
5 mm × 4 mm
LDC1041NHRJ
WSON (16)
5 mm × 4 mm
Axial Distance Sensing Application
Application Schematic
5V
VIO
5V
LDO
VIO
DGND
MOSI
MISO
MCU
SCLK
GPIO
INT/GPIO
Timer/Aux CLK
VIO
VDD
SDI
SDO
SCLK
CSB ^LDC1041
INTB
TBCLK
INA
INB
CFA
CFB
DGND _CLDO
GND
DAP
Sensor
DGND
DGND
AGND
Rp vs Distance With 14mm PCB Coil
14
12
10
8
6
4
2
0
0
1
2
3
4
5
6
7
8
Distance (mm)
C002
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.