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ST72589BW 数据表(PDF) 68 Page - STMicroelectronics |
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ST72589BW 数据表(HTML) 68 Page - STMicroelectronics |
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68 / 158 page  ST72589BW, ST72389BW 68/158 PWM/BRM GENERATOR (Cont’d) PWM/BRM Outputs The PWM/BRM outputs are assigned to dedicated pins. In these pins, the PWM/BRM outputs are connect- ed to a serial resistor which must be taken into ac- count to calculate the RC filter (see Figure 42). In any case, the RC filter time must be higher than TCPUx64. Figure 42. Typical PWM Output Filter Table 20. 6-Bit PWM Ripple After Filtering With RC filter (R=1K Ω), f CPU = 8 MHz VDD = 5V PWM Duty Cycle 50% R=Rint+Rext (Rext is optional). Note: after a reset these pins are tied low by de- fault and are not in a high impedance state. Figure 43. PWM Simplified Voltage Output After Filtering 1K (max) Cext OUTPUT VOLTAGE STAGE Rint OUTPUT Rext Cext (µF) V RIPPLE (mV) 0.128 78 1.28 7.8 12.8 0.78 V DD 0V 0V DD V Vripple (mV) V OUTAVG "CHARGE" "DISCHARGE" "CHARGE" "DISCHARGE" 0V V V 0V OUTAVG V (mV) ripple V "CHARGE" "DISCHARGE" "CHARGE" "DISCHARGE" PWMOUT DD DD PWMOUT OUTPUT VOLTAGE OUTPUT VOLTAGE |
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