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STMPE811 Datasheet(PDF) 28 Page - STMicroelectronics

Part # STMPE811
Description  8-bit port expander with advanced touchscreen controller
Download  54 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE811 Datasheet(HTML) 28 Page - STMicroelectronics

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Analog-to-digital converter
STMPE811
28/54
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.
11
10
987
6543
2
1
0
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
36
5.5
μs (180 kHz)
11
μs (90 kHz)
22
μs (45 kHz)
001
44
6.8
μs (147 kHz)
13.6
μs (74 kHz)
27
μs (36 kHz)
010
56
8.6
μs (116 kHz)
17.2
μs (58 kHz)
34.4
μs (29 kHz)
011
64
9.9
μs (101 kHz)
19.8
μs (51 kHz)
39.6
μs (25 kHz)
100
80
12.3
μs (81.5 kHz) 24.6 μs (41 kHz)
49.2
μs (20 kHz)
101
96
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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