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TC815 데이터시트(PDF) 20 Page - Microchip Technology

부품명 TC815
상세설명  3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function
PDF  26 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC815 데이터시트(HTML) 20 Page - Microchip Technology

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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
during
resistance
measurements.
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 VCC
(Pin 28) to Digital Ground (Pin 58). The signal is at VCC
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,
Ω/LOΩ) 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
VIN = 3.2V
VIN = 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
Due to
Range
Change
Due to Manual
Range Change
4kHz
15ms
15ms
15ms
610ms
122ms 122ms122ms
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
Due to
Range
Change



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