STMPE812 datasheet(29/51 Pages) STMICROELECTRONICS

部件名	STMPE812

功能描述	S-Touch® enhanced 4-wire resistive touchscreen controller with PWM

PDF	51 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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29 / 51 page

STMPE812

Touchscreen controller

Doc ID 17732 Rev 3

29/51

Touchscreen controller

The STMPE812 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 10.

Sampling time/frequency calculation

Oscillator speed

ADC

conversion

time

Touch

detect

delay

Settling

time

Median

averag

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)

Obsolete

Product(s)

- Obsolete

Product(s)

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