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STMPE812A датащи(PDF) 31 Page - STMicroelectronics

номер детали STMPE812A
подробное описание детали  Integrated 4-wire resistive touchscreen controller, pen-down/real-time mode, fullyautonomous
PDF  53 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE812A датащи(HTML) 31 Page - STMicroelectronics

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STMPE812A
Touchscreen controller
Doc ID 18225 Rev 4
31/53
11
Touchscreen controller
The STMPE812A is integrated with a hard-wired touchscreen controller for 4-wire resistive
type touchscreen. The touchscreen controller is able to operate completely autonomously,
and would interrupt the connected CPU only when pre-defined event occurs.
The TSC is based on an internal 20Ksamples/sec ADC, running off a 1 MHz (minimum
880 kHz) RC OSC.
Sampling time = touch detect delay*2 + (settling time + (ADC conversion time*MAV) ) *3
Figure 8.
Touchscreen controller internal RC OSC connection
Table 11.
Sampling time/frequency calculation
Oscillator speed
ADC
conversion
time
Touch
detect
delay
Settling
time
Median
average
Sampling time/freq
(complete X/Y/Z sample
sets)
880 kHz
50µs
40µs
40µs
None
40*2 + 3*(40+(50*1)) = 350 µs
(2.8K sample sets/sec)
880 kHz
50µs
40µs
40µs
10-2
40*2 + 3*(40+
(50*10))=1700 µs (588 sample
sets/sec)
880 kHz
50 µs
640 µs
640 µs
20-4
640*2 + 3*(640+ (50*20))
=6200 µs (161 sample
sets/sec)



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