Datasheet > LP5810BDSDR

LP5810BDSDR

更新时间： 2024-01-18 18:34:41

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
18页	918K
描述
4-channel RGBW LED driver with I2C and auto animation control \| DSD \| 8 \| -40 to 85

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LP5810BDSDR 数据手册

The reset delay needed depends on the power-up character-

istics of the system power supply. R₁and C₁are selected to

allow enough time for the power supply to stabilize. D₁

provides rapid reset if power is lost. In this example, the

R₁• C₁time constant is 10mS.

POWER-ON RESET

The reset circuit shown in Figure 4 provides a time delayed

release of reset to the MSP430 microcontroller. Operation of

the circuit is based on a stabilization time constant of the

supply voltage, rather than on a predetermined voltage

value. The negative input is a reference voltage created by

the internal voltage reference. The positive input is an RC

circuit that provides a power-up delay. When power is ap-

plied, the output of the comparator is low, holding the

processor in the reset condition. Only after allowing time for

the supply voltage to stabilize does the positive input of the

comparator become higher than the negative input, resulting

in a high output state, releasing the processor for operation.

The stabilization time required for the supply voltage is

adjustable by the selection of the RC component values. Use

of a lower-valued resistor in this portion of the circuit will not

increase current consumption because no current flows

through the RC circuit after the supply has stabilized.

RELAXATION OSCILLATOR

The TLV3012 can be configured as a relaxation oscillator as

in Figure 5 to provide a simple and inexpensive clock output.

The capacitor is charged at a rate of T = 0.69RC. It also

discharges at a rate of 0.69RC. Therefore, the period is

T = 1.38RC. R₁may be a different value than R₂.

V_C

2/3 (V+)

1/3 (V+)

T₁T₂

V+

R₁

1000pF

1MΩ

V_OUT

R₁

1MΩ

(1)

R_PULL-UP

MSP430

10kΩ

TLV3012

C₁

10nF

R₂

1MΩ

R₂

1MΩ

RESET

TLV301x

F = 724Hz

1.242V

V+

REF

R₂

1MΩ

NOTE: (1) Use R_PULL-UPwith the TLV3011 only.

FIGURE 5. TLV3012 Configured as a Relaxation Oscillator.

FIGURE 4. The TLV3011 or TLV3012 Configured as a

Power Up Reset Circuit for the MSP430.

TLV3011, TLV3012

SBOS300B

www.ti.com

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