STMPE812ABJR datasheet(31/53 Pages) STMICROELECTRONICS

부품명	STMPE812ABJR

상세설명	Integrated 4-wire resistive touchscreen controller, pen-down/real-time mode, fullyautonomous

PDF	53 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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31 / 53 page

STMPE812A

Touchscreen controller

Doc ID 18225 Rev 4

31/53

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

None

40*2 + 3*(40+(50*1)) = 350 µs

(2.8K sample sets/sec)

880 kHz

50µs

40µs

10-2

40*2 + 3*(40+

(50*10))=1700 µs (588 sample

sets/sec)

880 kHz

50 µs

640 µs

20-4

640*2 + 3*(640+ (50*20))

=6200 µs (161 sample

sets/sec)

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