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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ZAMC4100 датащи(PDF) 73 Page - Renesas Technology Corp |
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ZAMC4100 датащи(HTML) 73 Page - Renesas Technology Corp |
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73 / 156 page  ZAMC4100 Datasheet © 2016 Integrated Device Technology, Inc. 73 January 26, 2016 Figure 3.19 ECM Driver Structure VDDE VSS ECMEN EC_M EC_RES EN ECMOSF 6 ECMCSHEN RECMp CECM VSS DAC OVT Reset OVIF UVIF CSH CSL RECMs ECMCSLEN Open/Short Detect Error Amplifier HS Ctrl OC Detect LS ctrl ECM Control ECMOCIF DSCEN 3.11.1. ECM Driver Current/Voltage Limitation and Protection against Short to GND or Vbat The limitation of the current through the load to safe levels for all conditions is achieved by adding an external resistor between the EC_RES pin and the mirror terminal. Its value is chosen considering the characteristics of the EC mirror and the nominal supply voltage of the system (see Table 6.1 for recommended external com- ponents). In addition, the maximum voltage at the output of the driver is limited to the level specified in Table 1.9. The limitation of this voltage relies on the feedback connection between the mirror terminal and the EC_M pin. If this connection is missing, the voltage applied by the driver to its load could rise up to the supply of the system, so an important step before activating the driver is to perform an open/short diagnostic check (see 3.11.3). The current through both transistors (high-side and low-side) of the output stage is sensed for protecting the driver against a short to Vbat or GND of both output pins (EC_RES and EC_M). In the event of such failures, if the current exceeds a specified threshold level (see Table 1.9), the output stage of the ECM driver is automatically disabled. This event generates an interrupt to the MCU and the ECMOCIF flag bit in the ECMDIAG register is set (the ECMOCIF bit in IRQSTAT register is set; see |
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