ZHCSKH7 November 2019 LDC1001
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3 Feature Description
- 7.4 Device Functional Modes
- 7.5 Programming
- 7.6
Register Maps
- 7.6.1
Register Description
- 7.6.1.1 Revision ID (Address = 0x00)
- 7.6.1.2 RP_MAX (Address = 0x01)
- 7.6.1.3 RP_MIN (Address = 0x02)
- 7.6.1.4 Watchdog Timer Frequency (Address = 0x03)
- 7.6.1.5 LDC Configuration (Address = 0x04)
- 7.6.1.6 Clock Configuration (Address = 0x05)
- 7.6.1.7 Comparator Threshold High LSB (Address = 0x06)
- 7.6.1.8 Comparator Threshold High MSB (Address = 0x07)
- 7.6.1.9 Comparator Threshold Low LSB (Address = 0x08)
- 7.6.1.10 Comparator Threshold Low MSB (Address = 0x09)
- 7.6.1.11 INTB Pin Configuration (Address = 0x0A)
- 7.6.1.12 Power Configuration (Address = 0x0B)
- 7.6.1.13 Status (Address = 0x20)
- 7.6.1.14 Proximity Data LSB (Address = 0x21)
- 7.6.1.15 Proximity Data MSB (Address = 0x22)
- 7.6.1.16 Frequency Counter LSB (Address = 0x23)
- 7.6.1.17 Frequency Counter Mid-Byte (Address = 0x24)
- 7.6.1.18 Frequency Counter MSB (Address = 0x25)
- 7.6.1
Register Description
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
8.2.1.2.2 Calculating Sensor Capacitor
Sensor frequency depends on various factors in the application. In this example, use Equation 8 to calculate the sensor frequency to achieve an output data rate of 28 KSPS per the design parameter.
With an LDC1001 RESPONSE_TIME setting of 384 and an output data rate specification of 28 KSPS, the sensor frequency calculated in Equation 8 is 3.6 MHz.
Using Equation 9, the sensor capacitor is 108 pF with the sensor inductance of 18 µH. A 100-pF sensor capacitor will slightly increase the sensor frequency to 3.75 MHz and provide a sample rate of 29.3 KSPS.
As the target interacts with the sensor inductance, the apparent inductance will decrease. When the target is at the 1-mm minimum distance for this application, the maximum interaction will occur, and the sensor frequency will increase to 3.95 MHz.