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參數(shù)資料
| 型號： | TSC2101IRGZR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| 封裝： | GREEN, PLASTIC, VQFN-48 |
| 文件頁數(shù)： | 73/95頁 |
| 文件大小： | 1217K |
| 代理商： | TSC2101IRGZR |
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TSC2101
SLAS392D JUNE 2003 REVISED MAY 2005
www.ti.com
75
CONVERSION TIME CALCULATIONS FOR THE TSC2101
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):
tcoordinate + 2
tPRE ) tSNS ) tPVS
125 ns
tOSC ) 2
NAVG NBITS ) 1
8MHz
conv
) n1 ) 12 ) 1
tOSC ) 18 tOSC ) n2 tOSC ) n3 tOSC
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
tPRE ) tSNS
tOSC 125 ns . If D15D14 of control register 01H/page 1 = 10/11, then in case of continuous touch
PINTDAC remains high for
tPRE ) tSNS
tOSC 125 ns ) tPGDEL .
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
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