LDC1101 Datasheet, PDF (1/55 Pages) Texas Instruments – 1.8-V High-Resolution, High-Speed Inductance-to-Digital Converter

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
LDC1101
SNOSD01C – MAY 2015 – REVISED FEBRUARY 2016
LDC1101 1.8-V High-Resolution, High-Speed Inductance-to-Digital Converter
1 Features
•1 Wide Operating Voltage Range: 1.8 V to 3.3 V
• Sensor Frequency Range: 500 kHz to 10 MHz
• R_P Resolution: 16-Bit
• L Resolution: 16- or 24-Bit
• 180-kSPS Conversion Rate
• Threshold Detection Functionality
• 1% Part-to-Part Variation in R_P Measurement
• Supply Current:
– 1.4-µA Shutdown mode
– 135-µA Sleep mode
– 1.9-mA Active Mode (no sensor connected)
• Sub-Micron Distance Resolution Achievable
• Remote Sensor Placement Isolating the LDC from
Harsh Environments
• Robust Against Environmental Interferences such
as Oil, Water, Dirt, or Dust
• Minimal External Components
• Magnet-Free Operation
• Operating Temperature: –40°C to +125°C
2 Applications
• High-Speed Gear Counting
• High-Speed Event Counting
• Motor Speed Sensing
• Knobs and Dials for Appliances, Automotive, and
Consumer Applications
• HMI for Appliances, Automotive, and Consumer
Applications
• Buttons and Keypads
• Motor Control
• Metal Detection
3 Description
The LDC1101 is a 1.8-V to 3.3-V, high-resolution
inductance-to-digital converter for short-range, high-
speed, contactless sensing of position, rotation, or
motion, enabling reliable, accurate measurements
even in the presence of dust or dirt, making it ideal
for open or harsh environments.
The LDC1101 features dual inductive measurement
cores, allowing for > 150 ksps 16-bit R_P and L
measurements simultaneous with a high-resolution L
measurement which can sample at > 180 ksps with a
resolution of up to 24 bits. The LDC1101 includes a
threshold-compare function which can be dynamically
updated while the device is running.
Inductive sensing technology enables precise
measurement of linear/angular position,
displacement, motion, compression, vibration, metal
composition, and many other applications in markets
including automotive, consumer, computer, industrial,
medical, and communications. Inductive sensing
offers better performance and reliability at lower cost
than other, competing solutions.
The LDC1101 offers these benefits of inductive
sensing in a small 3-mm × 3-mm 10-pin VSON
package. The LDC1101 can be easily configured by a
microcontroller using the 4-pin SPI™.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LDC1101
VSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
1.8V
1.8V
Sensor
VDD
INA
Sensor
INB _Driver
GND
LDC1101
High Res
L Meas
RP + L
Meas
Threshold
Compare
CLKIN
CLDO
Registers
+ Logic
CSB
SCLK
SPI _SDI
SDO
CLKOUT
MCU
VDD
CSB
SCLK
MOSI
MISO
SPI
Peripheral
GND
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.