SNOSD15B December   2016  – April 2017 LDC2112 , LDC2114

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Digital Interface
    7. 6.7 I2C Interface
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Multi-Channel and Single-Channel Operation
      2. 7.3.2 Button Output Interfaces
      3. 7.3.3 Programmable Button Sensitivity
      4. 7.3.4 Baseline Tracking
      5. 7.3.5 Integrated Button Algorithms
      6. 7.3.6 I2C Interface
        1. 7.3.6.1 Selectable I2C Address (LDC2112 Only)
        2. 7.3.6.2 I2C Interface Specifications
        3. 7.3.6.3 I2C Bus Control
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Power Mode
      2. 7.4.2 Low Power Mode
      3. 7.4.3 Configuration Mode
    5. 7.5 Register Maps
      1. 7.5.1 Individual Register Listings
        1. 7.5.1.1 Gain Table for Registers GAIN0, GAIN1, GAIN2, and GAIN3
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1  Theory of Operation
      2. 8.1.2  Designing Sensor Parameters
      3. 8.1.3  Setting COM Pin Capacitor
      4. 8.1.4  Defining Power-On Timing
      5. 8.1.5  Configuring Button Scan Rate
      6. 8.1.6  Programming Button Sampling Window
      7. 8.1.7  Scaling Frequency Counter Output
      8. 8.1.8  Setting Button Triggering Threshold
      9. 8.1.9  Tracking Baseline
      10. 8.1.10 Mitigating False Button Detections
        1. 8.1.10.1 Eliminating Common-Mode Change (Anti-Common)
        2. 8.1.10.2 Resolving Simultaneous Button Presses (Max-Win)
        3. 8.1.10.3 Overcoming Case Twisting (Anti-Twist)
        4. 8.1.10.4 Mitigating Metal Deformation (Anti-Deform)
      11. 8.1.11 Reporting Interrupts for Button Presses and Error Conditions
      12. 8.1.12 Estimating Supply Current
    2. 8.2 Typical Application
      1. 8.2.1 Touch Button Design
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 DSBGA Light Sensitivity
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Export Control Notice
    8. 11.8 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

LDC2112
16-Pin DSBGA
Top View (Bumps Down)
LDC2112 LDC2114 ldc2114-pin-out-top-view-bumps-down-wcsp16-ldc2112-version-snosd15.gif
LDC2112
16-Pin TSSOP
Top View
LDC2112 LDC2114 ldc2114-pin-out-top-view-tssop16-ldc2112-version-snosd15.gif

Pin Functions - LDC2112

PIN I/O(1) DESCRIPTION
NAME DSBGA NO. TSSOP NO.
VDD C1 4 P Power supply
GND D1 2 G Ground(2)
A4 10
INTB B2 5 O Interrupt output
Polarity can be configured in Register 0x11.
LPWRB C2 3 I Normal / Low Power Mode select
Set LPWRB to VDD for Normal Power Mode or ground for Low Power Mode.
COM D2 1 A Common return current path for all LC resonator sensors
A capacitor should be connected from this pin to GND. Refer to Setting COM Pin Capacitor.
IN0 A3 9 A Channel 0 LC sensor input
IN1 A2 8 A Channel 1 LC sensor input
OUT0 D4 15 O Channel 0 logic output
Polarity can be configured in Register 0x1C.
OUT1 C4 13 O Channel 1 logic output
Polarity can be configured in Register 0x1C.
ADDR B3 11 I I2C address
When ADDR = Ground, I2C address = 0x2A. When ADDR = VDD, I2C address = 0x2B.
SCL D3 16 I I2C clock
SDA C3 14 I/O I2C data
NC A1 7 — No connect
Leave them floating.
B1 6
B4 12
(1) I = Input, O = Output, P=Power, G=Ground, A=Analog
(2) Both pins should be connected to the system ground on the PCB.
LDC2114
16-Pin DSBGA
Top View (Bumps Down)
LDC2112 LDC2114 ldc2114-pin-out-top-view-bumps-down-wcsp16-ldc2114-version-snosd15.gif
LDC2114
16-Pin TSSOP
Top View
LDC2112 LDC2114 ldc2114-pin-out-top-view-tssop16-ldc2114-version-snosd15.gif

Pin Functions - LDC2114

PIN I/O(1) DESCRIPTION
NAME DSBGA NO. TSSOP NO.
VDD C1 4 P Power supply
GND D1 2 G Ground(2)
A4 10
INTB B2 5 O Interrupt output
Polarity can be configured in Register 0x11.
LPWRB C2 3 I Normal / Low Power Mode select
Set LPWRB to VDD for Normal Power Mode or ground for Low Power Mode.
COM D2 1 A Common return current path for all LC resonator sensors
A capacitor should be connected from this pin to GND. Refer to Setting COM Pin Capacitor.
IN0 A3 9 A Channel 0 LC sensor input
IN1 A2 8 A Channel 1 LC sensor input
IN2 A1 7 A Channel 2 LC sensor input
IN3 B1 6 A Channel 3 LC sensor input
OUT0 D4 15 O Channel 0 logic output
Polarity can be configured in Register 0x1C.
OUT1 C4 13 O Channel 1 logic output
Polarity can be configured in Register 0x1C.
OUT2 B4 12 O Channel 2 logic output
Polarity can be configured in Register 0x1C.
OUT3 B3 11 O Channel 3 logic output
Polarity can be configured in Register 0x1C.
SCL D3 16 I I2C clock
SDA C3 14 I/O I2C data
I2C address = 0x2A.
(1) I = Input, O = Output, P=Power, G=Ground, A=Analog
(2) Both pins should be connected to the system ground on the PCB.