ZHCSM23 December   2021 LDC3114

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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 Timing Diagram
    9. 6.9 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 Multimode Operation
      2. 7.3.2 Multichannel and Single-Channel Operation
      3. 7.3.3 Raw Data Output
      4. 7.3.4 Button Output Interfaces
      5. 7.3.5 Programmable Button Sensitivity
      6. 7.3.6 Baseline Tracking
      7. 7.3.7 Integrated Button Algorithms
      8. 7.3.8 I2C Interface
        1. 7.3.8.1 I2C Interface Specifications
        2. 7.3.8.2 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 LDC3114 Registers
      2. 7.5.2 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 or Raw Data Scan Rate
      6. 8.1.6  Programming Button or Raw Data 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, Raw Data Ready 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
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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6.5 Electrical Characteristics

Over operating temperature range unless otherwise noted.
Over operating VDD range unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER
VDD Supply voltage 1.71 1.8 1.89 V
IDDNP Normal power mode supply current (4 channels)(1) (2) 4 channels, 40 SPS per channel,
1 ms sampling window per channel,
LPWRB = VDD
-40℃ ≤ TA ≤ 125℃		 0.46 2 mA
Normal power mode supply current (2 channels)(1)(2) 2 channels, 40 SPS per channel,
1 ms sampling window per channel,
LPWRB = VDD
-40℃ ≤ TA ≤ 125℃		 0.31 1 mA
IDDLP Low power mode supply current (1)(2) 1 channel, 1.25 SPS per channel,
1 ms sampling window per channel,
LPWRB = Ground
-40℃ ≤ TA ≤ 125℃		 10 35 µA
IDDSB Standby supply current No button active (EN = 0x00)
-40℃ ≤ TA ≤ 125℃		 7 22 µA
SENSOR
ISENSOR, MAX Maximum sensor current drive Registers SENSORn_CONFIG: RPn = 0(3) 2.5 mA
RP, MIN Minimum sensor parallel resonant impedance 350 Ω
RP, MAX Maximum sensor parallel resonant impedance 10 kΩ
fSENSOR Sensor resonant frequency(4) 5 30 MHz
QSENSOR, MIN Minimum sensor quality factor 5
QSENSOR, MAX Maximum sensor quality factor 30
VSENSOR, PP Sensor oscillation peak-to-peak voltage Measured on the INn(3) pins with reference to COM. 0.9 V
CIN Sensor input pin capacitance 17 pF
CONVERTER
SRNP, MIN Minimum normal power mode scan rate(5) LPWRB = VDD 7 10 13 SPS
SRNP, MAX Maximum normal power mode scan rate(5) LPWRB = VDD 56 80 104 SPS
SRLP, MIN Minimum low power mode scan rate(5) LPWRB = Ground 0.438 0.625 0.813 SPS
SRLP, MAX Maximum low power mode scan rate(5) LPWRB = Ground 3.5 5 6.5 SPS
fREF_CLK Internal Reference clock frequency TA=25℃ 44 MHz
fREF_CLK_TC Internal Reference clock frequency variation from TA=25℃ to over temperature -40℃ ≤ TA ≤ 125℃ 3 %
(1) Sensor configuration: LSENSOR = 0.85 µH, CSENSOR = 58 pF, QSENSOR = 11, RP = 0.7 kΩ.
(2) I2C communication and pull-up resistors current is not included.
(3) The italic n is the channel index, n = 0, 1, 2, or 3 for LDC3114.
(4) For optimal performance, configure the sensor frequency to be greater than 3 MHz
(5) For typical distribution of the scan rates, refer to Figure 6-9.
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