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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCA1462U/7 датащи(PDF) 7 Page - NXP Semiconductors |
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PCA1462U/7 датащи(HTML) 7 Page - NXP Semiconductors |
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7 / 24 page  1998 Apr 21 7 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series Voltage level detector The supply voltage is compared with the internal voltage reference VLIT and VEOL every minute. The first voltage level detection is carried out 30 ms after RESET. When a lithium voltage level is detected (VDD ≥ VLIT), the circuit starts operating in the lithium mode (Fig.4). When the detected VDD voltage level is between VLIT and VEOL, the circuit operates in the silver-oxide mode (Fig.3). If the battery end-of-life is detected (VDD <VEOL), the detection and stage control is switched OFF and the waveform produced is an unchopped version of the stage 8 waveform. To indicate this condition the waveform is produced in bursts of 4 pulses every 4 s. Detection of motor movement After a motor pulse, the motor is short-circuited to VDD for 1 ms. Afterwards the energy in the motor inductor will be dissipated to measure only the current generated by the induced motor voltage. During the time tDI (dissipation of energy time) all switches shown in Fig.5 are open to reduce the current as fast as possible. The current will now flow through the diodes D3 and D2, or D4 and D1. Then the first of 52 possible measurement cycles (tMC) starts to measure the induced current. Fig.5 Motor driving and detecting circuit. MSA941 VDD VSS MOTOR M1 M2 N1 D3 P1 D1 L1 L2 N2 D4 P2 D2 |
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