TIDA-00509 Reference Design

Texas Instruments

16-button Inductive Keypad Reference Design Using the LDC1314 Inductance-to-Digital Converter

Description

The LDC1314's unique inductive sensing capability is used to implement a contactless: 16 button: multi-function keypad. It uses standard PCB technology and easily manufactured components to implement a low cost solution.This reference design uses the LDC1314.  This reference design can also be used with LDC1312: LDC1612 and LDC1614.

Features
  • Contactless buttons: with superior reliability over electrical/mechanical contact solutionsCan be easily used to implement ruggedized: environmentally sealed keypad and keyboard solutions for harsh environmentsSupports simultaneous button pressesTemperature stableEasily scalable to larger key arrays
Applications
  • Clinical pulse oximeter
  • Video recorder
  • CPAP machine
  • Currency counter
  • Flat panel
  • Calling button operating panel
  • Intrusion HMI panel
  • Portable data terminal
  • HVAC gateway
  • Thermostat
  • CPU (PLC Controller)
  • Wearable fitness & activity monitor
  • Portable POS
  • Pachinko machine
  • Lab & field Instrumentation
  • Intrusion control panel
  • POS card reader
  • POS printer
  • Key panel
  • Multifunction relay
  • Appliances: battery charger
  • Power analyzer
  • Programmable DC power supply
  • Robotic lawn mower
  • Building security gateway
  • Professional video camera
  • Eye
  • ear
  • nose & throat exam
  • Mother & neonatal care monitor
  • Processor module
  • Compact relay
Product Categories
  • Sensors

End Equipment Reference Diagrams

Application Area End Equipment
Clinical pulse oximeter https://www.ti.com/solution/clinical-pulse-oximeter#referencedesigns
Video recorder https://www.ti.com/solution/video-recorder#referencedesigns
CPAP machine https://www.ti.com/solution/cpap-machine#referencedesigns
Currency counter https://www.ti.com/solution/currency-counter#referencedesigns
Flat panel https://www.ti.com/solution/flat-panel#referencedesigns
Calling button operating panel https://www.ti.com/solution/calling-button-operating-panel#referencedesigns
Intrusion HMI panel https://www.ti.com/solution/intrusion-hmi-panel#referencedesigns
Portable data terminal https://www.ti.com/solution/portable-data-terminal#referencedesigns
HVAC gateway https://www.ti.com/solution/hvac-gateway#referencedesigns
Thermostat https://www.ti.com/solution/thermostat#referencedesigns
CPU (PLC Controller) https://www.ti.com/solution/cpu-plc-controller#referencedesigns
Wearable fitness & activity monitor https://www.ti.com/solution/wearable-fitness-activity-monitor#referencedesigns
Portable POS https://www.ti.com/solution/portable-pos#referencedesigns
Pachinko machine https://www.ti.com/solution/pachinko-machine#referencedesigns
Lab & field Instrumentation https://www.ti.com/solution/lab-field-instrumentation#referencedesigns
Intrusion control panel https://www.ti.com/solution/intrusion-control-panel#referencedesigns
POS card reader https://www.ti.com/solution/pos-card-reader#referencedesigns
POS printer https://www.ti.com/solution/pos-printer#referencedesigns
Key panel https://www.ti.com/solution/key-panel#referencedesigns
Multifunction relay https://www.ti.com/solution/multi-function-relay#referencedesigns
Appliances: battery charger https://www.ti.com/solution/appliances-battery-charger#referencedesigns
Power analyzer https://www.ti.com/solution/power-analyzer#referencedesigns
Programmable DC power supply https://www.ti.com/solution/programmable-dc-power-supply#referencedesigns
Robotic lawn mower https://www.ti.com/solution/robotic-lawn-mower#referencedesigns
Building security gateway https://www.ti.com/solution/building-security-gateway#referencedesigns
Professional video camera https://www.ti.com/solution/professional-video-camera#referencedesigns
Eye https://www.ti.com/solution/eye-ear-nose-throat-exam#referencedesigns
ear https://www.ti.com/solution/mother-neonatal-care-monitor#referencedesigns
nose & throat exam https://www.ti.com/solution/processor-module#referencedesigns
Mother & neonatal care monitor https://www.ti.com/solution/compact-relay#referencedesigns
Processor module https://www.ti.com/solution/industrial-robot-teach-pendant-hmi#referencedesigns
Compact relay https://www.ti.com/solution/dj-equipment#referencedesigns
Robot teach pendant (HMI) https://www.ti.com/solution/piano-keyboard-synthesizer#referencedesigns
DJ equipment https://www.ti.com/solution/motorized-electronic-wheel-chair#referencedesigns
Piano https://www.ti.com/solution/medical-chair-table#referencedesigns
keyboard & synthesizer https://www.ti.com/solution/substation-automation#referencedesigns
Motorized electronic wheel chair https://www.ti.com/solution/mobile-pos#referencedesigns
Medical chair & table https://www.ti.com/solution/blood-pressure-monitor#referencedesigns
Substation automation https://www.ti.com/solution/circuit-breaker-acb-mccb-vcb#referencedesigns
Mobile POS https://www.ti.com/solution/operation-tables#referencedesigns
Blood pressure monitor https://www.ti.com/solution/dental-chairs#referencedesigns
Circuit breaker (ACB https://www.ti.com/solution/hmi-panel#referencedesigns

Parts

Part Number Name Companion Part
LP2985-N LP2985-N Buy Datasheet
MSP430F5528 MSP430F5528 Buy Datasheet
TPD4E004 TPD4E004 Buy Datasheet

Test Data

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Download the test file for TIDA-00509

Other Documents

Title Updated Type Size (KB)
TIDA-00509 Gerber (MCU) 24 Apr 2015 ZIP 109
TIDA-00509 Gerber (Keypad) 24 Apr 2015 ZIP 77
TIDA-00509 CAD Files (MCU) 24 Apr 2015 ZIP 138
TIDA-00509 CAD Files (Keypad) 24 Apr 2015 ZIP 220
TIDA-00509 PCB (MCU) 24 Apr 2015 PDF 275
TIDA-00509 PCB (Keypad) 24 Apr 2015 PDF 326
TIDA-00509 Assembly Drawing (MCU) 24 Apr 2015 PDF 293
TIDA-00509 Assembly Drawing (Keypad) 24 Apr 2015 PDF 74
TIDA-00509 BOM (MCU) 24 Apr 2015 PDF 207
TIDA-00509 BOM (Keypad) 24 Apr 2015 PDF 31
TIDA-00509 Schematic (MCU) 24 Apr 2015 PDF 38
TIDA-00509 Schematic (Keypad) 24 Apr 2015 PDF 60