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采用接地电容传感器的电容式感应是一种具有超低功耗、低成本和高分辨率的非接触式感应技术,适用于接近感应、手势识别、材料分析和远程液位感应等各类应用。电容式感应系统中的传感器可以采用任意金属或导体,因此可实现高度灵活的低成本系统设计。
FDC1004-Q1 是一款面向电容式传感解决方案的高分辨率 4 通道电容数字转换器,并且符合 AEC-Q100 标准。每个通道的满量程范围均为 ±15pF,可处理高达 100pF 的传感器偏移电容,该偏移电容既可以在内部编程,也可以是一个外部电容,用于跟踪环境随时间和温度的变化。凭借高偏移电容,可以使用远程传感器。
此外,FDC1004-Q1 还包含用于实现传感器屏蔽的屏蔽驱动器,不但可降低电磁干扰 (EMI),而且有助于聚焦电容传感器的感应方向。FDC1004-Q1 外形小巧,非常适合空间受限类应用。FDC1004-Q1 采用 10 引脚 VSSOP 封装,支持在量产过程中进行光学检测,并且具有一个用于连接 MCU 的 I2C 接口。
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
SHLD1 | 1 | A | Capacitive Input Active AC Shielding. |
CIN1 | 2 | A | Capacitive Input. The measured capacitance is connected between the CIN1 pin and GND. If not used, leave this pin as an open circuit. |
CIN2 | 3 | A | Capacitive Input. The measured capacitance is connected between the CIN2 pin and GND. If not used, leave this pin as an open circuit. |
CIN3 | 4 | A | Capacitive Input. The measured capacitance is connected between the CIN3 pin and GND. If not used, leave this pin as an open circuit. |
CIN4 | 5 | A | Capacitive Input. The measured capacitance is connected between the CIN4 pin and GND. If not used, leave this pin as an open circuit. |
SHLD2 | 6 | A | Capacitive Input Active AC Shielding. |
GND | 7 | G | Ground |
VDD | 8 | P | Power Supply Voltage. Decouple this pin to GND, using a low impedance capacitor, for example in combination with a 1μF tantalum and a 0.1μF multilayer ceramic. |
SCL | 9 | I | Serial Interface Clock Input. Connects to the controller clock line. Requires pullup resistor if not already provided elsewhere in the system. |
SDA | 10 | I/O | Serial Interface Bidirectional Data. Connects to the controller data line. Requires a pullup resistor if not provided elsewhere in the system. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Input voltage | VDD | –0.3 | 6 | V |
SCL, SDA | –0.3 | 6 | V | |
at any other pin | –0.3 | VDD+0.3 | V | |
Input current | at any pin | 3 | mA | |
Junction temperature(2) | 150 | °C | ||
Storage Temperature | TSTG | -65 | 150 | °C |