PIC16F913-I/SP Microchip Technology Inc., PIC16F913-I/SP Datasheet - Page 100

• Manufacturer Part Number: PIC16F913-I/SP
• Description: 28 PIN, 7 KB FLASH, 352 RAM, 25 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F913-I/SP

• A/d Inputs: 5-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 25
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 7K Bytes
• Ram Size: 256 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F917/916/914/913
8.6
The comparator module also allows the selection of an
internally generated voltage reference for one of the
comparator inputs. The VRCON register, Register 8-3,
controls the voltage reference module shown in
Figure 8-6.
8.6.1
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 8-1:
FIGURE 8-6:
DS41250E-page 98
VRR = 1 (low range): CV
VRR = 0 (high range):
V
DD
Comparator
Comparator Reference
CV
CV
CONFIGURING THE VOLTAGE
REFERENCE
REF
REF
VREN
Input
= (V
to
DD
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
/4) + (VR3:VR0 x V
REF
VR<3:0>
= (VR3:VR0/24) x V
16-1 Analog
8R
MUX
DD
V
VR <3:0> = ‘0000’
VRR
R
REN
/32)
DD
Preliminary
R
16 Stages
8.6.2
The full range of V
the construction of the module. The transistors on the
top and bottom of the resistor ladder network
(Figure 8-6) keep CV
V
clearing the VREN bit (VRCON<7>). When disabled,
the reference voltage is V
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
reference can be found in Section 19.0 “Electrical
Specifications”.
DD
REF
. The exception is when the module is disabled by
R
output changes with fluctuations in V
VOLTAGE REFERENCE
ACCURACY/ERROR
R
SS
REF
to V
REF
© 2005 Microchip Technology Inc.
DD
module current.
DD
SS
from approaching V
cannot be realized due to
derived and therefore, the
8R
when VR<3:0> = 0000.
VRR
DD
SS
. The
or