Digital Converter. LDC1041 Datasheet

LDC1041 Converter. Datasheet pdf. Equivalent

LDC1041 Datasheet
Recommendation LDC1041 Datasheet
Part LDC1041
Description Inductance to Digital Converter
Feature LDC1041; Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LDC1041 SN.
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Texas Instruments LDC1041
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
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
LDO
VIO
5V
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
01234567
Distance (mm)
8
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.



Texas Instruments LDC1041
LDC1041
SNOSCY1 – MARCH 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Terminal Configuration and Functions................ 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 Handling Ratings....................................................... 4
6.3 Recommended Operating Conditions(1) ................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements ................................................ 6
6.7 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes........................................ 12
7.5 Programming........................................................... 15
7.6 Register Map and Description................................. 16
8 Applications and Implementation ...................... 21
8.1 Application Information............................................ 21
8.2 Typical Applications ................................................ 22
9 Power Supply Recommendations...................... 26
10 Layout................................................................... 26
10.1 Layout Guidelines ................................................. 26
10.2 Layout Example .................................................... 27
11 Device and Documentation Support ................. 28
11.1 Trademarks ........................................................... 28
11.2 Electrostatic Discharge Caution ............................ 28
11.3 Glossary ................................................................ 28
12 Mechanical, Packaging, and Orderable
Information ........................................................... 29
4 Revision History
DATE
March 2014
REVISION
*
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: LDC1041
Copyright © 2014, Texas Instruments Incorporated



Texas Instruments LDC1041
www.ti.com
5 Terminal Configuration and Functions
WSON-16
Top View
SCLK
CSB
SDI
VIO
SDO
DGND
CFB
1
2
3
4
5
6
7
CFA 8
DAP
(GND)
16 INTB
15 N/C
14 TBCLK
13 CLDO
12 VDD
11 GND
10 INB
9 INA
LDC1041
SNOSCY1 – MARCH 2014
TERMINAL
NAME
SCLK
CSB
TERMINAL
NO.
1
2
SDI 3
VIO
SDO
DGND
CFB
CFA
INA
INB
GND
VDD
CLDO
TBCLK
N/C
INTB
4
5
6
7
8
9
10
11
12
13
14
15
16
DAP
17
TERMINAL
TYPE (1)
DO
DI
DI
P
DO
P
A
A
A
A
P
P
A
DI
N/C
DO
P
Terminal Description
FUNCTION
SPI clock input. SCLK is used to clock-out/clock-in the data from/into the chip
SPI CSB(Chip Select Bar). Multiple devices can be connected on the same SPI bus and
CSB can be used to select the device to be communicated with
SPI Slave Data In (Master Out Slave In). This should be connected to the Master Out Slave
In of the master
Digital IO Supply
SPI Slave Data Out (Master In Slave Out).It is high impedance when CSB is high
Digital ground
LDC filter capacitor
LDC filter capacitor
External LC Tank. Connect to external LC tank
External LC Tank. Connect to external LC tank
Analog ground
Analog supply
LDO bypass capacitor. A 56nF capacitor should be connected from this Terminal to GND
External time-base clock
No Connection
Configurable interrupt. This Terminal can be configured to behave in 3 different ways by
programing the INT Terminal mode register. Either threshold detect, wakeup, or DRDYB
Connect to GND
(1) DO: Digital Output, DI: Digital Input, P: Power, A: Analog
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: LDC1041
Submit Documentation Feedback
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