PIC12F683-I/MD Microchip Technology Inc., PIC12F683-I/MD Datasheet - Page 54

• Manufacturer Part Number: PIC12F683-I/MD
• Description: 8 PIN, 3.5KB FLASH, 128 RAM, 6 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC12F683-I/MD

• A/d Inputs: 4-Channel, 10-Bit
• Comparators: 1
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Frequency: 20 MHz
• Input Output: 6
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 8-Pin PDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 Bytes
• Serial Interface: None
• 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

PIC12F683
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 8-5.
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 8-5:
DS41211B-page 52
VRR = 1 (Low Range): CV
VRR = 0 (High Range):
CV
V
DD
REF
Comparator
= (V
Comparator Reference
CV
CONFIGURING THE VOLTAGE
REFERENCE
DD
REF
VREN
Input
/4) + (VR3:VR0
to
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
REF
VR<3:0>
= (VR3:VR0/24) x V
X
16-1 Analog
V
DD
8R
MUX
/32)
R
VREN
VR<3:0> = 0000
VRR
DD
Preliminary
R
16 Stages
8.6.2
The full range of V
construction of the module. The transistors on the top
and bottom of the resistor ladder network (Figure 8-5)
keep CV
tion is when the module is disabled by clearing the VREN
bit (VRCON<7>). When disabled, the reference voltage
is V
(VRCON<5>) bit is set. This allows the comparator to
detect a zero-crossing and not consume CV
current.
The voltage reference is V
CV
tested absolute accuracy of the comparator voltage
reference can be found in Section 15.0 “Electrical
Specifications”.
REF
SS
R
output changes with fluctuations in V
REF
when VR<3:0> is ‘0000’ and the VRR
VOLTAGE REFERENCE
ACCURACY/ERROR
from approaching V
R
SS
to V
DD
 2004 Microchip Technology Inc.
DD
cannot be realized due to the
derived and therefore, the
8R
SS
or V
DD
. The excep-
REF
DD
VRR
module
. The