Datasheet

dsPIC33EPXXXGM3XX/6XX/7XX DS70000689D-page 328  2013-2014 Microchip Technology Inc.
FIGURE 23-1: ADCx MODULE BLOCK DIAGRAM WITH CONNECTION OPTIONS FOR ANx PINS AND OP AMPS
+
–
CMP1
/OA1
0x
10
11
VREFL
VREFL
VREFL
+
–
CH0
0
1
VREFL
AN0-ANx
OA1-OA3, OA5
CH0Sx
CH0Nx
CH123Nx
00000
11111
A
B
1
0
CH0SA<5:0>
(3)
CH0SB<5:0>
(3)
CH0Sx
CH0Nx
CH0NA
(3)
CH0NB
(3)
CSCNA
CH123Sx
CH123Nx
CH123SA<2:0>
CH123SB<2:0>
CH123NA<1:0>
CH123NB<1:0>
S&H1
Alternate Input
Selection
Channel Scan
This diagram depicts all of the available
ADCx connection options to the four S&H
amplifiers, which are designated: CH0,
CH1, CH2 and CH3.
The ANx analog pins or op amp outputs are
connected to the CH0-CH3 amplifiers
through the multiplexers, controlled by the
SFR control bits, CH0Sx, CH0Nx, CH123Sx
and CH123Nx.
A
B
A
B
A
B
+
–
CH1
+
–
CH2
+
–
CH3
CH123Sx
+
–
OA2
CH123Sx
0x
10
11
CH123Nx
0x
10
11
CH123Nx
+
–
OA3
CH123Sx
OA2OUT/AN0/C2IN4-/C4IN3-/RPI16//RA0
PGEC1/OA1IN+/AN4/C1IN3-/C1IN1+/C2IN3-/RPI34/RB2
PGED1/OA1IN-/AN5/C1IN1-/CTMUC/RP35/RTCC/RB3
PGEC3/CV
REF +/OA1OUT/AN3/C1IN4-/C4IN2-/
AN9/RPI27/RA11
OA2IN+/AN1/C2IN3-/C2IN1+/RPI17/RA1
AN10/RPI28/RA12
PGED3/OA2IN-/AN2/C2IN1-/SS1
/RPI32/CTED2/RB0
OA3IN+/AN8/C3IN3-/C3IN1+/RPI50/U1RTS
/BCLK1/FLT3/
OA3OUT/AN6/C3IN4-/C4IN4-/C4IN1+/RP48/OCFB/RC0
OA3IN-/AN7/C3IN1-/C4IN1-/RP49/RC1
AN11/C1IN2-/U1CTS
/FLT4/PMA12/RC11
OA1
V REF +
(1)
AV DD AV SS V REF -
(1)
VCFG<2:0>
ADC1BUF0
(4)
ADC1BUF1
(4)
ADC1BUF2
(4)
ADC1BUFF
(4)
ADC1BUFE
(4)
From CTMU
Current Source (CTMUI)
CTMU TEMP
S&H2
S&H3
S&H0
Note 1: VREF+, VREF- inputs can be multiplexed with other analog inputs.
2: Channels 1, 2 and 3 are not applicable for the 12-bit mode of operation.
3: These bits can be updated with Step commands from the PTG module. For more information, refer to the “Peripheral Trigger Generator (PTG)” chapter in the specific device data sheet.
4: When ADDMAEN (ADxCON4<8>) = 1, enabling DMA, only ADCxBUF0 is used.
OPEN
ALTS
(MUXA/MUXB)
000
001
010
011
1xx
000
001
010
011
1xx
+
–
OA5
000
001
010
011
1xx
OA5IN+/AN24/C5IN3-/C5IN1+/SDO1/RP20/T1CK/RA4
TMS/OA5IN-/AN27/C5IN1-/RP41/RB9
OA5OUT/AN25/C5IN4-/RP39/INT0/RB7
SAR ADC
V
REFH
VREFL
RPI33/CTED1/RB1
PMA13/RC2
+
–