PIC16C781T-I/SO Microchip Technology, PIC16C781T-I/SO Datasheet - Page 71

• Manufacturer Part Number: PIC16C781T-I/SO
• Description: IC MCU CMOS 8BIT 1K 20MHZ 20SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C781T-I/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 13
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x8b; D/A 1x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• For Use With: AC164028 - MODULE SKT PROMATEII 20SOIC/DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Other names: PIC16C781TI/SO

9.0
The 8-bit ADC module, shown in Figure 9-1, has 10
inputs in the PIC16C781/782:
• 8 external channels, AN<7:0> (RA<3:0> and
• 2 internal channels, V
The ADC allows conversion of an analog input signal to
a corresponding 8-bit digital value. The desired chan-
nel is connected to a Sample-and-Hold by the input
multiplexers. The output of the Sample-and-Hold cap-
FIGURE 9-1:
RB<3:0>)
2001 Microchip Technology Inc.
RB0/INT/AN4/V
RA2/AN2/V
RA3/AN3/V
RA0/AN0/OPA+
RA1/AN1/OPA-
RB1/AN5/V
RB3/AN7/OPA
ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
RB2/AN6
REF
REF
DAC
2
1
R
ADC MODULE BLOCK DIAGRAM
R
and V
DAC
0
1
2
3
4
5
6
7
8
9
Preliminary
VOLTAGE COMPARATOR MODULE
OPA MODULE
4
DAC MODULE
AV
V
V
V
V
REF
R
DAC
R
tures a snapshot of the voltage and holds it for the
ADC. The ADC then generates the 8-bit result via suc-
cessive approximation.
The analog reference voltage (ADC
selectable from the following options:
• The analog positive supply: AV
• The reference input for Comparator C1: V
• The Voltage Reference module output: V
• The DAC Converter module output: V
The ADC has the unique feature of being able to oper-
ate while the device is in SLEEP mode. To operate in
SLEEP, the ADC conversion clock must be derived
from the ADC’s dedicated internal RC oscillator.
DD
MODULE
CHS<3:0>
1
0
1
2
3
PIC16C781/782
VCFG<1:0>
GO/DONE
ADON
Sample
Hold
and
ADC
DD
ADC
REF
DS41171A-page 69
REF
DAC
) is software
R
REF
8
1