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參數(shù)資料
| 型號： | TC815 |
| 廠商： | Microchip Technology Inc. |
| 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)字自動測距的A / D三層液晶顯示驅(qū)動器和轉(zhuǎn)換器保持功能 |
| 文件頁數(shù)： | 20/26頁 |
| 文件大?。?/td> | 595K |
| 代理商： | TC815 |
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TC815
DS21474B-page 20
2002 Microchip Technology Inc.
11.0
“BUZZER” DRIVE SIGNAL
The TC815 BUZ output (Pin 4) will drive a piezo electric
audio transducer. The signal is activated to indicate an
input overrange condition for current and voltage
measurements,
or
continuity
measurements.
during
resistance
During a resistance measurement, a reading less than
19 on any full scale range, causes a continuous 4kHz
signal to be output. This is used as a continuity
indication.
A voltage or current input measurement overrange is
indicated by a noncontinuous 4kHz signal at the BUZ
output. The LCD display MSD also flashes and the
three least significant digits are set to display zero.
The buzzer drive signal for over range is shown in
Figure 11-1 The buzzer output is active for any reading
over 2000 counts in both manual and auto-range oper-
ation. The buzzer is activated during an extended res-
olution measurement. The BUZ signal swings from V
CC
(Pin 28) to Digital Ground (Pin 58). The signal is at V
CC
when not active.
The BUZ output is also activated for 15msec whenever
a range change is made in auto-range or manual oper-
ation. Changing the type of measurement (voltage, cur-
rent, or resistance) or measurement option (AC/DC,
/LO
) will also activate the buzzer output for 15msec.
A range change during a current measurement will not
activate the buzzer output.
FIGURE 11-1:
TC815 WAVEFORM FOR BUZZER OUTPUT
122ms
122ms
122ms
122ms
122ms
610ms
Digital Ground
4kHz Signal
1 Conversion
Noncontinuous Buzzer Signal Indicates Input Overrange
Power-up
4000
8000
12000
Change Range
Change Range
Change Range
Change Input
V
IN
= 3.2V
V
IN
= 250mV
1000 Clock Pulses
100ms
1638.5CP
Integrate
De-integrate
Auto-Zero
BUZ
(Pin 4)
200mV Range
Over Range
2,000V Range
In Range
2,000V Range
In Range
2,000V Range
In Range
2,000V Range
Out of Range
200mV Range
Extended Range
Manual Range
Auto-Ranging
3000CP
250CP
2500CP
250CP
250CP
122ms
2000CP
Internal
TC815
Signals
4kHz
4kHz
4kHz
122ms 122ms122ms
Due to
Range
Change
Due to Manual
Range Change
4kHz
15ms
Due to
Range
Change
15ms
15ms
610ms
Buzzer activated due to
Previous Conversion Over Range
One Cycle of Over Range
Buzzer
Buzzer activated due
to Power-up
Buzzer
activated due
to Previous
Over Range
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