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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TC818A датащи(PDF) 18 Page - Microchip Technology |
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TC818A датащи(HTML) 18 Page - Microchip Technology |
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18 / 24 page  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 VCC (Pin 28) to DGND (Pin 58). The signal is at VCC 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, Ω/LOΩ), 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 VIN = 250mV 4000 1000 Clock Pulses 100ms 1638.5 CP 8000 12000 Change Range Change Range Change Range Change Input VIN = 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 VCC 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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