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PICDEM TM Lab Development Board User’s Guide
4.2.6
4.2.6.1
Lab 3: Higher Resolution Sensor Readings Using a Single
Comparator
NEW REGISTERS USED IN THIS LAB
To configure the peripherals used in this lab, the following registers are used:
1. Timer1 Control Register: T1CON (Register 6-1 in Section 6 of the PIC16F690
data sheet)
- This register is used to control Timer1 and select various features of the
module. In this lab the register will be used to enable Timer1 and select the
clock source.
4.2.6.2
OVERVIEW
This lab expands on concepts discussed in the previous comparator lab by
implementing intelligence to create a higher resolution temperature sensor
measurement application. The comparator will be configured to operate as a simple
relaxation oscillator with the addition of a few external components. The internal
voltage reference will still be used to provide the non-inverting reference only this time
the 0.6V fixed voltage reference feature will be implemented.
The basic oscillator circuit is shown in Figure 4-4.
FIGURE 4-4:
BASIC RELAXATION OSCILLATOR CIRCUIT
PIC16F690
0.6V
V
t
C12IN0-
+
_
C1OUT
V
t
D1
R 1
V SS
C 1
V SS
Referring to Figure 4-4, at start-up, the capacitor connected to the inverting reference
of Comparator 1 is completely discharged. Therefore, the voltage present on the invert-
ing reference is 0V which is less than the 0.6V fixed voltage reference on the
non-inverting reference and Comparator 1’s output goes high. This rapidly charges the
capacitor through the diode (D1) to a level approximately equal to V DD . Once the Com-
parator detects that the inverting reference input is greater than the 0.6V fixed voltage
reference, the output transitions low. The charge across the capacitor then discharges
slowly across the resistor R1. Once the capacitor charge drops below the 0.6V fixed
DS41369A-page 68
? 2009 Microchip Technology Inc.
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