参数资料
型号: AD7143ACPZ-1500RL7
厂商: Analog Devices Inc
文件页数: 6/57页
文件大小: 0K
描述: IC CTLR PROGRAMMABLE CDC 16LFCSP
标准包装: 1
类型: 电容数字转换器
输入类型: 逻辑
输出类型: 逻辑
接口: I²C
电流 - 电源: 1mA
安装类型: 表面贴装
封装/外壳: 16-VQFN 裸露焊盘,CSP
供应商设备封装: 16-LFCSP-VQ
包装: 标准包装
产品目录页面: 781 (CN2011-ZH PDF)
其它名称: AD7143ACPZ-1500RL7DKR
AD7143
Rev. 0 | Page 13 of 56
CAPACITANCE SENSOR INPUT CONFIGURATION
Each input connection from the external capacitance sensors to
the AD7143 converter can be uniquely configured by using the
registers in Table 38 and Table 39. These registers are used to
configure input pin connection setups, sensor offsets, sensor
sensitivities, and sensor limits for each stage. Each sensor can be
individually optimized. For example, a button sensor connected
to STAGE0 can have a different sensitivity and offset values
than a button with a different function that is connected to a
different stage.
CIN INPUT MULTIPLEXER SETUP
The CIN_CONNECTION_SETUP registers in Table 38 list the
available options for connecting the sensor input pin to the CDC.
The AD7143 has an on-chip multiplexer to route the input
signals from each pin to the input of the converter. Each input
pin can be tied to either the negative or the positive input of the
CDC or can be left floating. Each input can also be internally
connected to the CSHIELD signal to help prevent cross coupling. If
an input is not used, always connect it to CSHIELD.
Connecting a CINx input pin to the positive CDC input results
in a decrease in CDC output code when the corresponding
sensor is activated. Connecting a CINx input pin to the negative
CDC input results in an increase in CDC output code when the
corresponding sensor is activated.
Two bits in each sequencer stage register control the mux
setting for the input pin.
CIN CONNECTION SETUP BITS
CIN SETTING
00
CINx FLOATING
01
CINx CONNECTED TO
NEGATIVE CDC INPUT
10
CINx CONNECTED TO
POSITIVE CDC INPUT
11
CINx CONNECTED TO
INTERNAL BIAS
CIN0
CIN1
CIN2
CIN3
CIN4
CIN5
CIN6
CIN7
+
CDC
06
47
2-
01
8
Figure 20. Input Mux Configuration Options
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