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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1344 of 1441
NXP Semiconductors
UM10503
Chapter 48: 12-bit ADC (ADCHS)
48.6.11 Speed register
The Speed register settings depend on the current settings CRS. For CRS = 0x3, all
DGEC should be set to -1 (0xF), for CRS = 0x4 all DGEC should be set to -2 (0xE). For all
other cases DGEC can be kept equal to 0. See also
.
48.6.12 Power control register
Power consumption and maximum speed of the ADC can be programmed by means of
the current settings signal CRS[3:0] as shown in
. Speed settings DCEC should
follow the CRS settings.
The input signals of the ADC can be either AC-coupled by means of two capacitors or
connected directly to the inputs (DC-coupled). For AC coupling, the DC biasing is
generated internally by setting DCINNEG= 1 and DCINPOS= 1.
5:4
THCMP_CROSS
Threshold Crossing Comparison result
00: No Threshold Crossing detected
01: Downward Threshold Crossing detected
10: Upward Threshold Crossing detected
11: Reserved
0x0
17:6
SAMPLE
12-Bit value of last converted sample for this channel
0x0
20:17 -
Reserved
0x0
31:21 -
Reserved
0x0
Table 1132.Last sample registers (LAST_SAMPLE[0:5], address 0x400F 0028 (LAST_SAMPLE0) to 0x400F 003C
(LAST_SAMPLE(5)) bit description
Bit
Symbol
Description
Reset
value
Table 1133.Speed register (ADC_SPEED, address 0x400F 0104) bit description
Bit
Symbol
Description
Reset value
3:0
DGEC0
Speed0
0x0
7:4
DGEC1
Speed1
0x0
11:8
DGEC2
Speed2
0x0
15:12
DGEC3
Speed3
0x0
19:16
DGEC4
Speed4
0x0
23:20
DGEC5
Speed5
0x0
31:24
-
Reserved
-
Table 1134.Power and speed programming
CRS[3:0]
Power [mW]
fADC [MS/s]
DGECi
0x0
20
20
0x0
0x1
30
30
0x0
0x2
45
50
0x0
0x3
60
65
0xF
0x4
75
80
0xE
0x5-0xF
do not use these
settings
n.a.
0x0