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TS3004 데이터시트(PDF) 10 Page - Silicon Laboratories |
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TS3004 데이터시트(HTML) 10 Page - Silicon Laboratories |
10 / 12 page TS3004 Page 10 TS3004 Rev. 1.0 approximately 80µs. This is well above the required minimum pulse width of 40µs. Flashing Railroad Lights with the TS3004 With only three resistors and two off the shelf LEDs, the TS3004 can be configured into a flashing railroad lights circuit. With the input divider set to FDIV2:0 = 101 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 TS3004 and a Potentiometer to Dim an LED The TS3004 can be configured to dim an LED by modulating the pulse width of the PWMOUT output. With the input divider set to FDIV2:0 = 011 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: TS3004 Configured to Dim an LED with a Potentiometer Figure 4: Flashing Railroad Lights with the TS3004 |
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