PIC16F785-I/SO Microchip Technology, PIC16F785-I/SO Datasheet - Page 71

• Manufacturer Part Number: PIC16F785-I/SO
• Description: IC PIC MCU FLASH 2KX14 20SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F785-I/SO

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 20-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: RS- 232/USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164120, DM163029
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SO1-1 - SOCKET TRANS ICE 20DIP TO 20SOICXLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILAC162060 - HEADER INTRFC MPLAB ICD2 20PINAC164039 - MODULE SKT PROMATE II 20DIP/SOIC
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

10.0
There are two voltage references available in the
PIC16F785: The voltage referred to as the comparator
reference (CV
The voltage referred to as the VR reference (VR) is a
fixed voltage derived from a stable bandgap source.
Each source may be individually routed internally to the
comparators or output, buffered or unbuffered, on the
RA1/AN1/C12IN0-/V
10.1
The comparator module also allows the selection of an
internally generated voltage reference for one of the
comparator inputs. The VRCON register
(Register 10-1) controls the voltage reference module
shown in Figure 10-1.
10.1.1
The voltage reference can output 32 distinct voltage
levels, 16 in a high range and 16 in a low range.
The following equation determines the output voltages:
EQUATION 10-1:
FIGURE 10-1:
 2004 Microchip Technology Inc.
VRR = 1 (low range):
VRR = 0 (high range):
Comparator 1
Comparator 2
CV
CV
C1V
V
C2V
DD
VOLTAGE REFERENCES
Comparator Reference
REF
REF
REF
REF
CONFIGURING THE VOLTAGE
REFERENCE
Input
Input
= VR<3:0>
= (V
CVREN
REF
CVROE
to
to
CV
DD
) is a variable voltage based on V
REF
/4) + (VR<3:0>
REF
(1)
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
X
/ICSPCLK pin.
1
V
0
1
0
DD
/24
X
8R
V
DD
C1VREN
C2VREN
16-1 Analog
/32)
15
MUX
0
· ·
·
R
1.2 V
VR3:VR0
VR
Preliminary
DD
R
;
16 Stages
Note 1: See Register 10-1, Bits 3-0.
10.1.2
The full range of V
the construction of the module. The transistors on the
top and bottom of the resistor ladder network
(Figure 10-1) keep CV
V
clearing all CVROE, C1VREN and C2VREN bits.
When disabled, the reference voltage is V
VR<3:0> is ‘0000’ and the VRR (VRCON<5>) bit is
set. This allows the comparators to detect a zero-
crossing and not consume CV
The voltage reference is V
CV
tested absolute accuracy of the comparator voltage ref-
erence can be found in Table 18-8.
DD
REF
. The exception is when the module is disabled by
R
output changes with fluctuations in V
VOLTAGE REFERENCE
ACCURACY/ERROR
R
SS
to V
REF
DD
DD
PIC16F785
from approaching V
cannot be realized due to
derived and therefore, the
8R
REF
module current.
DS41249A-page 69
SS
DD
VRR
when
. The
SS
or