參數(shù)資料
型號： TSC2008TRGVRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC16
封裝： 4 X 4 MM, PLASTIC, VQFN-16
文件頁數(shù)： 11/35頁
文件大?。?/td> 418K
代理商： TSC2008TRGVRQ1
GND
TEMP1
TEMP2
V
DD
PenTouch
X+
Y+
Y-
HighwhentheX+orY+
driverison,orwhenany
sensorconnection/short-
circuittestsareactivated.
GND
ON
Sense
Viasgotosystemanaloggroundplane.
GND
Highwhen
theX+orY+
driverison.
Control
Logic
R
IRQ
VDD/REF
PENIRQ
Connectto
AnalogSupply
7Acquired
Data
7
7m asu
e
rementsinput
intotemporaryarray
Sortby
descendingorder
7
Averagingoutp t
u
fromwindowof3
3
SBAS552
– JUNE 2011
Figure 28. Example of a Pen-Touch Induced Interrupt via the PENIRQ Pin
Preprocessing
The TSC2008-Q1 has a fixed combined MAV filter (median value filter and averaging filter).
MAV Filter
If the acquired signal source is noisy because of the digital switching circuit, it may necessary to evaluate the
data without noise. In this case, the median value filter operation helps remove the noise. The array of seven
converted results is sorted first. The middle three values are then averaged to produce the output value of the
MAV filter.
The MAV filter is applied to all measurements for all analog inputs including the touch screen inputs, temperature
measurements TEMP1 and TEMP2, and auxiliary input AUX. To shorten the conversion time, the MAV filter may
be bypassed though the setup command; see Table 2 and Table 4.
Figure 29. MAV Filter Operation (Patent Pending)
Copyright
2011, Texas Instruments Incorporated
19
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