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参数资料
| 型号： | TC820CLW |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 10/28页 |
| 文件大小： | 616K |
| 代理商： | TC820CLW |
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TC820
DS21476B-page 18
2002 Microchip Technology Inc.
FIGURE 5-4:
SUGGESTED CRYSTAL
OSCILLATOR CIRCUIT
Where low cost is important, the RC circuit of Figure 5-5
can be used. The frequency of this circuit will be
approximately:
EQUATION 5-1:
FIGURE 5-5:
RC OSCILLATOR CIRCUIT
Typical values are R = 10k
and C = 68pF. The resis-
tor value should be
≥ 100k. For accurate frequency
measurement, an RC oscillator frequency of 40kHz is
required.
5.5
System Timing
All system timing is derived from the clock oscillator.
The clock oscillator is divided by 2 prior to clocking the
A/D counters. The clock is also divided by 8 to drive the
buzzer, by 240 to generate the LCD backplane fre-
quency, and by 40,000 for the frequency counter time-
base. A simplified diagram of the system clock is
shown in Figure 5-6.
FIGURE 5-6:
SYSTEM CLOCK
GENERATION
5.6
Component Value Selection
5.6.1
AUTO-ZERO CAPACITOR - CAZ
The value of the auto-zero capacitor (CAZ)has some
influence on system noise. A 0.47
F capacitor is rec-
ommended; a low dielectric absorption capacitor
(Mylar) is required.
5.6.2
REFERENCE VOLTAGE
CAPACITOR - CREF
The reference voltage capacitor used to ramp the inte-
grator output voltage back to zero during the reference
integrate cycle is stored on CREF.A 0.1F capacitor is
typical. A good quality, low leakage capacitor (such as
Mylar) should be used.
TC820
40kHz
38
39
5pF
10pF
22M
470k
37
TOSC =
0.3
RC
5pF
37
38
39
110k
10pF
75pF
TC820
A/D
Counter
TC820
÷ 40,000
Counter
Time-Base
÷ 240
LCD
Backplane
Driver
÷ 8
Buzzer
÷ 2
OSC1
OSC2
OSC3
XTAL
Oscillator
Components
RC
Oscillator
Components
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