參數(shù)資料
型號(hào)： TC815CBU
廠商： Microchip Technology Inc.
元件分類(lèi)： 顯示驅(qū)動(dòng)器
英文描述： 3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function
中文描述： 3-1/2數(shù)字自動(dòng)測(cè)距的A / D三層液晶顯示驅(qū)動(dòng)器和轉(zhuǎn)換器保持功能
文件頁(yè)數(shù)： 10/26頁(yè)
文件大?。?/td> 595K
代理商： TC815CBU
TC815
DS21474B-page 10
2002 Microchip Technology Inc.
3.5
Current Measurement
The TC815 measures current only under manual range
operation. The two user selectable full scale ranges
are: 20mA and 200mA. Select the current Measure-
ment mode by holding the I input (Pin 63) low at digital
ground potential. The OHM input (Pin 2) is left floating
or tied to the positive supply.
Two ranges are possible. The 20mA full scale range is
selected by connecting the 20mA input (Pin 3) to digital
ground. If left floating the 200mA full scale range is
selected.
External current to voltage conversion resistors are
used at the I
I
input (Pin 45). For 20mA measurements
a 10
resistor is used. The 200mA range needs a 1
resistor; full scale is 200mV.
PC board trace resistance between analog common
and R16 (see Figure 2-1) must be minimized. In the
200mA range, for example, a 0.05 trace resistance will
cause a 5% current to voltage conversion error at I
I
(Pin 45).
The extended resolution measurement option operates
during current measurements. To minimize rollover
error the potential difference between ANALOG COM
(Pin 29) and system common must be minimized.
3.6
Measurement Options
(AC to DC Measurements)
In voltage and current measurements, the TC815 can
be configured for AC measurements. An on-chip oper-
ational amplifier and external rectifier components per-
form the AC to DC conversion.
When power is first applied, the TC815 enters the DC
Measurement mode. For AC measurements (current or
voltage), AC/DC (Pin 62) is momentarily brought low to
digital ground potential; the TC815 sets-up for AC mea-
surements and the AC liquid crystal display annuncia-
tor activates. Toggling AC/DC low again will return the
TC815 to DC operation.
If the Manual Operating mode has been selected, tog-
gling AC/DC will reset the TC815 back to the Auto-
Range mode. In Manual mode operation, AC or DC
operation should be selected first and then the desired
range selected.
The minimum AC voltage full scale voltage range is 2V.
The DC full scale minimum voltage is 200mV. AC cur-
rent measurements are available on the 20mA and
100mA full scale current ranges.
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