參數(shù)資料
型號(hào)： TSC2008TRGVRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC16
封裝： 4 X 4 MM, PLASTIC, VQFN-16
文件頁(yè)數(shù)： 8/35頁(yè)
文件大?。?/td> 418K
代理商： TSC2008TRGVRQ1
Converter
-REF
+REF
+IN
-IN
PenTouch
Control
Logic
A[2:0]
MedianValueFilter
and
AveragingFilter
(MAV)
V
DD
GND
TEMP1
TEMP2
R
IRQ
90kW
50kW
AUX
GND
X+
X-
Y+
Y-
VDD/REF
PENIRQ
SBAS552
– JUNE 2011
ANALOG-TO-DIGITAL CONVERTER
Figure 25 shows the analog inputs of the TSC2008-Q1. The analog inputs (X, Y, and Z touch panel coordinates,
chip temperature and auxiliary inputs) are provided via a multiplexer to the Successive Approximation Register
(SAR) analog-to-digital converter (ADC). The A/D architecture is based on capacitive redistribution architecture,
which inherently includes a sample-and-hold function.
Figure 25. Analog Input Section (Simplified Diagram)
A unique configuration of low on-resistance switches allows an unselected A/D converter input channel to
provide power and an accompanying pin to provide ground for driving the touch panel. By maintaining a
differential input to the converter and a differential reference input architecture, it is possible to negate errors
caused by the driver switch on-resistance.
Reference
The TSC2008-Q1 uses an external voltage reference applied to the VDD/REF pin. The upper reference voltage
range is the same as the supply voltage range, which allows for simple, 1.2V to 3.6V single-supply operation of
the chip.
16
Copyright
2011, Texas Instruments Incorporated
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