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TS3005 Scheda tecnica(PDF) 10 Page - Silicon Laboratories |
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TS3005 Scheda tecnica(HTML) 10 Page - Silicon Laboratories |
10 / 12 page TS3005 Page 10 TS3005 Rev. 1.0 can be calculated using Equation 2. In Figure 3, a value of 4.32M Ω for RSET sets the FOUT output period to 20.5ms. A CPWM capacitor of 0.1µF was chosen, which sets the pulse width of PWMOUT to approximately 30ms. This is well above the required minimum pulse width of 20.5ms. Flashing Railroad Lights with the TS3005 With only three resistors and two off the shelf LEDs, the TS3005 can be configured into a flashing railroad lights circuit. With the input divider set to FDIV2:0 = 010 and RSET= 3.24M Ω, the FOUT output frequency is 1Hz. Refer to Figure 4. During the time the output is HIGH, only the pull-down LED is on while when the output is LOW, only the pull-up LED is on. The supply voltage of the circuit is 5V. Using the TS3005 and a Potentiometer to Dim an LED The TS3005 can be configured to dim an LED by modulating the pulse width of the PWMOUT output. With the input divider set to FDIV2:0 = 000 and RSET= 2M Ω, the FOUT output frequency is approximately 100Hz (or 10ms period). Refer to Figure 5. The CPWM capacitor was calculated using Equation 2 with a pulse width of 8.1ms. To reduce the pulse width from 8.1ms and in turn, dim the LED, a 1M Ω potentiometer is used. The potentiometer is connected to the PWM_CNTRL pin in a voltage divider configuration. The supply voltage of the circuit is 5V. . Figure 5: TS3005 Configured to Dim an LED with a Potentiometer Figure 4: Flashing Railroad Lights with the TS3005 |
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