NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
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Revision V1.30
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5.32.4 Basic Configuration
The ADC peripheral clock can be enabled in ADC (PCLKEN1[24]). The ADC engine clock source
is selected by ADC_S (CLKDIV7[23:16]) and ADC engine clock divider is determined by ADC_N
(CLKDIV7[31:24]).
5.32.5 Functional Description
ADC Transfer Function
5.32.5.1
The ADC output coding is offset in binary, 1LSB=VREF/4096, the transfer characteristic is shown
in the following graph:
ADC_OUT
ADC_OUT
ANALOG INPUT
ANALOG INPUT
0
0
1
LS
B
1
LS
B
2
LS
B
2
LS
B
3
LS
B
3
LS
B
4
LS
B
4
LS
B
5
LS
B
5
LS
B
6
LS
B
6
LS
B
4
0
9
3
LS
B
4
0
9
3
LS
B
4
0
9
4
LS
B
4
0
9
4
LS
B
4
0
9
5
LS
B
4
0
9
5
LS
B
4
0
9
6
LS
B
4
0
9
6
LS
B
0000 0000 0001
0000 0000 0001
0000 0000 0010
0000 0000 0010
0000 0000 0011
0000 0000 0011
0000 0000 0100
0000 0000 0100
0000 0000 0000
0000 0000 0000
1111 1111 1100
1111 1111 1100
1111 1111 1101
1111 1111 1101
1111 1111 1110
1111 1111 1110
1111 1111 1111
1111 1111 1111
Figure 5.32-2 ADC Transfer Function
Selection of Input Signal
5.32.5.2
IN_SEL[2:0]
Select ADC Analog Input Signal
Description
000
VBT
ADC analog input, intended for battery voltage detection. It
includes an inherent resistor divider and a switch.
001
VHS
ADC high speed input, could support 1MS/S.
When HSPEED is set to high, it supports 1MS/S; when HSPEED
is set to low, it supports 200KS/S.
010
A_2
ADC low speed input, could support 200KS/S; Keypad signal
input pin.
011
VSENSE
ADC analog input, intended for 5-wire touch screen detection.