AD7147
目录
特点................................................. ............................................. 1
应用................................................. ...................................... 1
一般说明................................................ .......................... 1
功能框图............................................... ............... 1
修订历史................................................ ............................... 2
规格................................................. .................................... 3
SPI时序规范（ AD7147 ） ......................................... 5
I
2
I2C时序规范（ AD7147-1 ） ..................................... 6
绝对最大额定值............................................... ............. 7
ESD注意事项................................................ .................................. 7
引脚配置和功能描述........................... 8
典型性能特征............................................. 9
工作原理............................................... ....................... 11
电容感应原理.............................................. ...... 11
BIAS引脚................................................ ....................................... 12
操作模式................................................ ........................ 12
Capacitiance - 数字转换器............................................ ... 14
过采样的CDC输出.............................................. 14
电容式传感器偏移控制.......................................... 14
转换序列................................................ ............... 14
CDC转换序列时间............................................ 16
CDC转换结果............................................... ............ 16
电容传感器输入配置.................................... 17
CINx输入多路复用器设置.............................................. .... 17
单端连接到CDC .................................. 17
非接触式接近检测............................................... .. 18
重新校准................................................. .............................. 18
接近灵敏度................................................ .................. 18
FF_SKIP_CNT ................................................. ........................... 21
T
电容传感器的行为，无需校准............... 23
电容传感器行为与校准...................... 24
慢FIFO ................................................ .................................... 24
SLOW_FILTER_UPDATE_LVL .............................................. 24
自适应阈值和灵敏度............................................. 25
中断输出................................................ ............................. 27
CDC转换完成中断.................................... 27
传感器触摸中断.............................................. ............... 27
GPIO INT输出控制.............................................. ......... 29
输出................................................. ........................................... 31
AC
盾
输出................................................. ......................... 31
GPIO ................................................. ........................................... 31
使用GPIO来打开/关闭的LED ................................ 31
串行接口................................................ ................................ 32
SPI接口................................................ ................................ 32
I
2
C兼容接口.............................................. ............ 34
V
DRIVE
输入................................................. ................................ 36
PCB设计指南............................................... .................. 37
电容式传感器板机械规格............. 37
芯片级封装............................................... .................... 37
上电排序.............................................. ......................... 38
典型应用电路............................................... .......... 39
注册地图................................................ ................................... 40
详细寄存器说明............................................... ...... 41
银行1寄存器............................................... .......................... 41
银行2寄存器............................................... .......................... 51
银行3寄存器............................................... .......................... 56
外形尺寸................................................ ....................... 68
订购指南................................................ .......................... 68
环境校准................................................ ........... 23
修订历史
9月7日 - 修订版0 ：初始版
第0版|第68 2
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