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ST72141K 数据表(PDF) 122 Page - STMicroelectronics |
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ST72141K 数据表(HTML) 122 Page - STMicroelectronics |
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122 / 132 page  ST72141K 122/132 10.7 MEMORY AND PERIPHERAL CHARACTERISTICS Recommended operating conditions with TA=-40 to +125 oC and V DD-VSS=5V unless otherwise specified. Note: 1) Unless otherwise specified, typical data is based on TA = 25° C and VDD-VSS = 5 V. This data is provided only as de- sign guidelines and are not tested. 2) The VMTChyst hysteresis is constant. Figure 64. Motor Control Comparator Characteristics EPROM Symbol Parameter Conditions Min Typ Max Unit WERASE UV lamp Lamp wavelength 2537Å 15 W-sec/cm2 tERASE Erase Time UV lamp placed 1 inch from the device window without any interposed filters 15 20 min WATCHDOG Symbol Parameter Conditions Min Typ Max Unit tw(WDG) Watchdog time-out duration 12,288 786,432 tCPU fCPU=8MHz 1.54 98.3 ms tWDGRST Watchdog RESET pulse width 500 ns MOTOR CONTROL Symbol Parameter Conditions Min Typ 1) Max Unit VOFFSET Comparator offset error <10 100 mV VMTChyst MCIA/B/C comparator hysteresis 2) 35 80 130 mV tPROPAG Comparator propagation delay 1 µs Reference voltage tolerance 5 % R1 VCREF resistance bridge 30 k Ω R2 70 0.7 ∆α/αα tolerance 5% ∆V REF VREF α= R1+R2 R2 t COMPARATOR IDEAL REAL VIN tPROPAG tPROPAG VOFFSET VOFFSET VREF+ VMTChyst 2 VREF- VMTChyst 2 |
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