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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TC815 датащи(PDF) 20 Page - Microchip Technology |
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TC815 датащи(HTML) 20 Page - Microchip Technology |
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20 / 26 page  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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