STMPE811_08 datasheet(28/54 Pages) STMICROELECTRONICS

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Analog-to-digital converter

STMPE811

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ADC_DATA_CHn

ADC channel data registers

Address:

Add address

Type:

R/W

Reset:

0x0000

Description:

ADC data register 0-7 (DATA_CHn=0 -7)

The ADC in STMPE811 operates on an internal RC clock with a typical frequency of

6.5 MHz. The total conversion time in ADC mode depends on the "SampleTime" setting,

and the clock division field 'Freq'.

The following table shows the conversion time based on 6.5 MHz, 3.25 MHz and 1.625 MHz

clock.

987

6543

DATA[11:0]

[11:0] DATA[11:0]: ADC channel data

If TSC is enabled, CH3-0 is used for TSC and all readings to these channels give 0x0000

Table 13.

ADC conversion time

Sample time

setting

Conversion time

in ADC clock

6.5 MHz

(154 ns)

3.25 MHz

(308 ns)

1.625 MHz

(615 ns)

000

5.5

μs (180 kHz)

μs (90 kHz)

μs (45 kHz)

001

6.8

μs (147 kHz)

13.6

μs (74 kHz)

μs (36 kHz)

010

8.6

μs (116 kHz)

17.2

μs (58 kHz)

34.4

μs (29 kHz)

011

9.9

μs (101 kHz)

19.8

μs (51 kHz)

39.6

μs (25 kHz)

100

12.3

μs (81.5 kHz) 24.6 μs (41 kHz)

49.2

μs (20 kHz)

101

14.8

μs (67.6 kHz) 28.8 μs (33 kHz)

59.2

μs (17 kHz)

110

124

19.1

μs (52.3 kHz) 38.2 μs (26 kHz)

56.4

μs (13 kHz)

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