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MPR121QR2 датащи(PDF) 12 Page - Freescale Semiconductor, Inc

номер детали MPR121QR2
подробное описание детали  Proximity Capactive touch Senosr controller
PDF  57 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPR121QR2 датащи(HTML) 12 Page - Freescale Semiconductor, Inc

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MPR121
Sensors
12
Freescale Semiconductor
Figure 4. MPR121 Electrode Measurement Charging Pad Capacitance
When measuring capacitance there are some inherent restrictions due to the methodology used. On the MPR121 the voltage
after charging must be in the range that is shown in Figure 5.
Figure 5.
The valid operating range of the electrode charging source is 0.7 V to (VDD - 0.7 V). This means that for a given VDD the valid
ADC (voltage visible to the digital interface) range is given by
,
Equation 3
and
.
Equation 4
These equations are represented in the graph. In the nominal case of VDD = 1.8 V the ADC range is shown below in Table 7.
Table 7.
VDD
ADChigh
ADClow
ADCmid
1.8
625.7778
398.2222
512
Electrode Charge Time
T
V
Electrode
Charging
Electrode
Discharging
Electrode voltage measured here
2T
Electrode Discharge Time
Valid ADC Value s vs. VDD
0
100
200
300
400
500
600
700
800
900
1.71
1.91
2.11
2.31
2.51
2.71
VDD (V)
ADChigh
ADCmid
ADClow
ADC
low
0.7
V
DD
------------ 1024
()
=
ADC
high
V
DD
0.7
–
V
DD
-------------------------- 1024
()
=



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