CS8140 데이터 시트보기 (PDF) - Cherry semiconductor

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CS8140

5V, 500mA Linear Regulator with ENABLE, RESET, and Watchdog

Cherry semiconductor 

Figure 3: Timing Diagrams for Watchdog and ENABLE Functions

3a: VOUT when Watchdog is held high and ENABLE = HIGH.

Battery

VIN

ENABLE

Battery

WDI 0V

RESET 0V

VOUT 0V

POR Normal Operation

3b: VOUT when Watchdog is held low and ENABLE = HIGH.

Battery

VIN

ENABLE

WDI 0V

RESET 0V

Battery

VOUT 0V

POR Normal Operation

WDI held High

WDI held Low

3c: VOUT when Watchdog is too slow and ENABLE = HIGH.

Battery

VIN

ENABLE

WDI 0V

Battery

RESET 0V

VOUT 0V

POR Normal Operation

3d: VOUT when Watchdog is too fast and ENABLE = HIGH.

Slow WDI signal

VIN

ENABLE

WDI 0V

Battery

Battery

RESET 0V

VOUT 0V

POR Normal Operation

Fast WDI signal

3e: WDI held high after a normal period of operation; ENABLE = LOW.

Battery

VIN

ENABLE

WDI 0V

Battery

RESET 0V

VOUT 0V

POR

Normal Operation WDI

high

Sleep Mode

POR

3f: WDI held low or is too slow after a normal period of operation; ENABLE = LOW.

Battery

Normal Operation

VIN

ENABLE

Battery

WDI 0V

RESET 0V

VOUT 0V

POR Normal Operation WDI

low

Sleep Mode POR Normal Operation

3g: WDI frequency rises above the upper frequency threshold after a normal period of operation; ENABLE = LOW

(for the CS8140 only).

Battery

VIN

ENABLE

Battery

WDI 0V

RESET 0V

VOUT 0V

POR Normal Operation

Sleep Mode

7

POR Normal Operation

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