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| 型号： | TC820CPL |
| 厂商： | Microchip Technology |
| 文件页数： | 16/34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
4.2.1
EOC/HOLD
4.2.2
OVER RANGE (OR),
EOC/HOLD is a dual purpose, bi-directional pin. As an
output, this pin goes low for 10 clock cycles at the end
of each conversion. This pulse latches the conversion
data into the display driver section of the TC820.
EOC/HOLD can be used to hold (or "FREEZE") the
display. Connecting this pin to V DD inhibits the display
update process. Conversions will continue, but the
display will not change. EOC/HOLD will hold the
display reading for either analog-to-digital, or frequency
measurements.
The input/output structure of the EOC/HOLD pin is
shown in Figure 4-2 . The output drive current is only a
UNDER RANGE (UR)
The OR output will be high when the analog input
signal is greater than full scale (3999 counts). The UR
output will be high when the display reading is 380
counts or less.
The OR and UR outputs can be used to provide an
auto-ranging meter function. By logically ANDing these
outputs with the inverted EOC/HOLD output, a single
pulse will be generated each time an under ranged or
over ranged conversion occurs ( Figure 4-2 ).
few microAmps, so EOC/HOLD can easily be over-
driven by an open collector logic gate, as well as a FET,
bipolar transistor, or mechanical switch. When used as
an output, EOC/HOLD will have a slow rise and fall
EOC/HOLD
UR
*
*
TC820
time due to the limited output current drive. A CMOS
Schmitt trigger buffer is recommended.
OR
*74HC132
*
EOC/HOLD
4
≈ 500k Ω
Display
Update
FIGURE 4-3: Generating Under Range
And Over Range Pulses.
4.2.3
V DISP
The V DISP input sets the peak-to-peak LCD drive
TC820
EOC
voltage. In the 40-pin package, V DISP is connected
internally to DGND, providing a typical LCD drive
voltage of 5V P-P . The 44-pin package includes a
separate V DISP input for applications requiring a
variable or temperature compensated LCD drive volt-
FIGURE 4-2:
DS21476C-page 16
EOC/HOLD Pin.
age. See the applications information for suggested
circuits.
? 2007 Microchip Technology Inc.
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