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參數(shù)資料
| 型號： | TC818 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| 中文描述： | 自動測距模擬到數(shù)字轉(zhuǎn)換器與數(shù)字顯示3-1/2 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大小： | 583K |
| 代理商： | TC818 |
TC818A
DS21475B-page 18
2002 Microchip Technology Inc.
3.17
“Buzzer” Drive Signal
The BUZ output (Pin 4) will drive a piezo electric audio
transducer. The signal is activated to indicate an input
over range condition for current and voltage measure-
ments, 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 over range is
indicated by a noncontinuous 4kHz signal at the BUZ
output. The LCD most significant digit also flashes and
the three least significant digits are set to display zero.
The buzzer drive signal for over range is shown in
Figure 3-14. The BUZ 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 DGND
(Pin 58). The signal is at V
CC
when not active.
The BUZ output is also activated for 15ms whenever a
range change is made in auto-range or manual opera-
tion. Changing the type of measurement (voltage, cur-
rent, or resistance), or measurement option (AC/DC,
/LO
), also activates the buzzer output for 15msec.
A range change during a current measurement will not
activate the buzzer output.
FIGURE 3-14:
TC818A TIMING WAVEFORM FOR BUZZER OUTPUT
Power-up
V
IN
= 250mV
4000
1000 Clock
Pulses
100ms
1638.5
CP
8000
12000
Change
Range
Change
Range
Change
Range
Change Input
V
IN
= 3.2V
Noncontinuous Buzzer Signal Indicates Input Over Range
3000CP
250CP
250CP
250CP
122ms
2000
CP
AZ
DEINT
INT
Integrate
TSC818A
Signals
BUZ
(Pin 4)
Auto-Ranging
200mV
Range
Over Range
2V
Range
In Range
2V
Range
In Range
200mV
Range
Extended
Range
Manual Range
2V
Range
In Range
2V Range
Out of Range
One Cycle of
Over Range Buzzer
4kHz
4kHz
1 Conversion
Digital Ground
V
CC
Buzzer Activated due
to Power-up
15ms
Due to Manual
Range Change
Due to
Range Change
15ms
Buzzer Activated due
to Previous Conversion
Over Range
122ms
122ms
122ms
122ms
122ms
610ms
Buzzer Activated
due to Previous
Conversion
Over Range
4kHz
4kHz
610ms
122ms
4kHz Signal
15ms
2500CP
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