參數(shù)資料
型號(hào): AD7143ACPZ-1500RL7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 6/57頁(yè)
文件大小: 0K
描述: IC CTLR PROGRAMMABLE CDC 16LFCSP
標(biāo)準(zhǔn)包裝: 1
類型: 電容數(shù)字轉(zhuǎn)換器
輸入類型: 邏輯
輸出類型: 邏輯
接口: I²C
電流 - 電源: 1mA
安裝類型: 表面貼裝
封裝/外殼: 16-VQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 16-LFCSP-VQ
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 781 (CN2011-ZH PDF)
其它名稱: 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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