TS3005ITD1033 datasheet(10/12 Pages) SILABS

部品番号	TS3005ITD1033

部品情報	Single Resistor Sets Output Frequency

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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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