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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 18/34页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 3/4DGT LGC PROBE 40DIP |
| 标准包装： | 10 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 数字或字符： | A/D，3.75 位数字 |
| 电流 - 电源： | 1mA |
| 电源电压： | 9V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
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TC820
TC820
TC820
5pF
10pF
RC
Oscillator
Components
XTAL
37
38
470k Ω
39
Oscillator
Components
40kHz
22M Ω
FIGURE 5-4:
Suggested Crystal Oscillator
Circuit.
can be used. The frequency of this circuit will be
approximately:
EQUATION 5-1:
OSC1
OSC2
A/D
Counter
Buzzer
OSC3
÷ 2
÷ 8
T OSC =
0.3
RC
LCD
Backplane
Driver
÷ 240
TC820
Counter
Time-Base
÷ 40,000
FIGURE 5-6:
System Clock Generation.
5pF
10pF
5.6
5.6.1
Component Value Selection
AUTO-ZERO CAPACITOR - C AZ
37
110k Ω
38
75pF
39
The value of the auto-zero capacitor (C AZ ) has some
influence on system noise. A 0.47 μF capacitor is
recommended; a low dielectric absorption capacitor
(Mylar) is required.
FIGURE 5-5:
RC Oscillator Circuit.
5.6.2
REFERENCE VOLTAGE
Typical values are R = 10 k Ω and C = 68pF. The
resistor value should be ≥ 100 k Ω . For accurate
frequency measurement, an RC oscillator frequency of
40 kHz is required.
CAPACITOR - C REF
The reference voltage capacitor used to ramp the
integrator output voltage back to zero during the
reference integrate cycle is stored on C REF . A 0.1 μF
5.5
System Timing
capacitor is typical. A good quality, low leakage
capacitor (such as Mylar) should be used.
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
frequency, and by 40,000 for the frequency counter
time-base. A simplified diagram of the system clock is
DS21476C-page 18
? 2007 Microchip Technology Inc.
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