000-0046140-111
Page 130 of 169
SLG46140
20.0 Voltage Reference (VREF)
20.1 Voltage Reference Overview
The SLG46140 has a Voltage Reference Macrocell to provide references to the two analog comparators. This macrocell can
supply a user selection of fixed voltage references, /3 and /4 reference off of the V
DD
power supply to the device, and externally
supplied voltage references from pins 4 and 5. The macrocell also has the option to output reference voltages on pin 3. See table
below for the available selections for each analog comparator. Also see
below, which shows the reference output
structure.
Table 79. VREF Selection Table
reg_acmpx-
ref_sel <4:0>
ACMP0_VREF
ACMP1_VREF
11111
DAC0_out
DAC0_out
11110
DAC1_out
DAC1_out
11101
vref_ext_ac-
mp0 / 2
vref_ext_ac-
mp0 / 2
11100
vref_ext_ac-
mp1 / 2
vref_ext_ac-
mp1 / 2
11011
vref_ext_acmp0 vref_ext_acmp0
11010
vref_ext_acmp1 vref_ext_acmp1
11001
vdd/4
vdd/4
11000
vdd/3
vdd/3
10111
1.20
1.20
10110
1.15
1.15
10101
1.10
1.10
10100
1.05
1.05
10011
1.00
1.00
10010
0.95
0.95
10001
0.90
0.90
10000
0.85
0.85
01111
0.80
0.80
01110
0.75
0.75
01101
0.70
0.70
01100
0.65
0.65
01011
0.60
0.60
01010
0.55
0.55
01001
0.50
0.50
01000
0.45
0.45
00111
0.40
0.40
00110
0.35
0.35
00101
0.30
0.30
00100
0.25
0.25
00011
0.20
0.20
00010
0.15
0.15
00001
0.10
0.10
00000
0.05
0.05
Содержание GreenPAK SLG46140
Страница 102: ...000 0046140 111 Page 101 of 169 SLG46140 14 1 Initial Polarity Operations Figure 54 DFF Polarity Operations ...
Страница 103: ...000 0046140 111 Page 102 of 169 SLG46140 Figure 55 DFF Polarity Operations with nReset ...
Страница 104: ...000 0046140 111 Page 103 of 169 SLG46140 Figure 56 DFF Polarity Operations with nSet ...