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PCA2001 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA2001 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 30 page PCA2000_2001 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 08 — 23 August 2010 6 of 30 NXP Semiconductors PCA2000; PCA2001 32 kHz watch circuit with programmable adaptive motor pulse 7.2 Step detection Figure 5 shows a simplified diagram of the motor driving and step detection circuit, and Figure 6 shows the step detection sequence and corresponding sampling current. Between the motor driving pulses, the switches P1 and P2 are closed, which means the motor is short-circuited. For a pulse in one direction, P1 and N2 are open, and P2 and N1 are closed with the appropriate duty cycle; for a pulse in the opposite direction, P2 and N1 are open, and P1 and N2 closed. The step detection phase is initiated after the motor driving pulse. In phase 1 P1 and P2 are first closed for 0.98 ms and then in phase 2 all four drive switches (P1, N1, P2 and N2) are opened for 0.98 ms. As a result, the energy stored in the motor inductance is reduced as fast as possible. The induced current caused by the residual motor movement is then sampled in phase 3 (closing P3 and P2) and in phase 4 (closing P1 and P4). For step detection in the opposite direction P1 and P4 are closed during phase 3 and P2 and P3 during phase 4 (see Figure 6). Fig 5. Simplified diagram of motor driving and step detection circuit mgw352 VDD VSS MOTOR MOT1 N1 P1 D1 RD N2 P2 P4 P3 MOT2 |
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