參數(shù)資料
型號(hào)： TSC2111IRGZTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 0.4 W, 1 CHANNEL, AUDIO AMPLIFIER, QCC48
封裝： PLASTIC, QFN-48
文件頁(yè)數(shù)： 79/99頁(yè)
文件大小： 1143K
代理商： TSC2111IRGZTG4
TSC2111
SLAS495A JUNE 2006 REVISED OCTOBER 2007
www.ti.com
80
CONVERSION TIME CALCULATIONS FOR THE TSC2111
Touch Screen Conversion Initiated at Touch Detect
The time needed to get a converted X/Y coordinate for reading can be calculated by (not including the time
needed to send the command over the SPI bus):
t
coordinate +
2
t
PRE )
t
SNS )
t
PVS
125 ns
t
OSC )
2
N
AVG
N
BITS )
1
8MHz
conv
) n
1 )
12
) 1
t
OSC )
18
t
OSC )
n
2
t
OSC )
n
3
t
OSC
where:
tcoordinate = time to convert X/Y coordinate
tPVS = Panel voltage stabilization time
tPRE = precharge time
tSNS = sense time
NAVG = number of averages; for no averaging, NAVG = 1
NBITS = number of bits of resolution
conv = A/D converter clock frequency
tOSC = Oscillator clock period
n1 = 6 ; if conv = 8 MHz
7 ; if
conv ≠ 8 MHz
n2 = 4 ; if tPVS = 0 s
0 ; if tPVS ≠ 0 s
n3 = 0 ; if tSNS = 32 s
2 ; if tSNS ≠ 32 s
tPGDEL = Programmable delay in between conversion for touch screen measurement
= 0: if programmable delay mode is disabled for touch screen measurement
(1) tPGDEL delay is generated by using: Internal oscillator clock whose typical frequency is 1 MHz, in internal clock
mode, or MCLK/CLKDIV (as programmed in control register 14H/pag1) in external clock mode.
(2) The above formula is valid exactly only when the codec is powered down. Also after touch detect the formula holds
true from second conversion onwards.
(3) If D15D14 of control register 01H/page 1 = 00, then in case of continuous touch PINTDAV remains high for
t
PRE )
t
SNS
t
OSC
125 ns
. If D15D14 of control register 01H/page 1 = 10/11, then in case of continuous touch
PINTDAC remains high for
t
PRE )
t
SNS
t
OSC
125 ns
) t
PGDEL .
Programmed
for Self
Controlled
XY Scan
Mode
Detecting Touch
Sample,Conversion &
Averaging for
YCoordinate
Reading
XData
Register
Reading
YData
Register
Detecting
Touch
Sample,Conversion &
Averaging for
XCoordinate
Detecting
Touch
Sample,Conversion &
Averaging for
YCoordinate
Detecting
Touch
SS DEACTIVATED
Touch Is Detected
(As PENIRQ
[D15D14 = 00])
PINTDAV
(As PENIRQ & DATA_AVA
[D15D14 = 10/11])
PINTDAV
Touch Is Detected
(As DATA_AVA
[D15D14 = 01])
PINTDAV
The time for a complete X/Y/Z1/Z2 coordinate conversion is given by(not including the time needed to send
the command over the SPI bus):
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