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3 Pin Microcontroller Power Supply Supervisor

ASM809, ASM810

October 2003

rev 1.0

Application Information

Negative VCC Transients

The ASM809/810 protect µPs from brownouts and low VCC.

Short duration transients of 100mV amplitude and 20µs or

less duration typically do not cause a false RESET.

Valid Reset with VCC under 1.1V

When VCC is under 1.1V, to ensure logic inputs connected to

the ASM809 RESET pin are in a known state, a 100k

Ω pull-

down resistor is needed at RESET . The value of the resistor

is not critical. A 100k

Ω pull-up resistor to VCC at RESET is

needed with the ASM810.

Bidirectional Reset Pin Interfacing

The ASM809/810 can interface with µP / µC bi-directional

reset pins by connecting a 4.7k

Ω resistor in series with the

ASM809/810 reset output and the µP/µC bi-directional reset

pin.

VCC

Power Supply

ASM809

RESET

GND

100kΩ

VCC

Power Supply

ASM810

RESET

GND

100kΩ

Power supply

BUF

Buffered

RESET

VCC

ASM809

GND

RESET

Input

µC or µP

4.7kΩ

Bi-directional I/O Pin

Figure 2: RESET valid with VCC under 1.1V

Figure 3: RESET valid with VCC under 1.1V

Figure 4: Bidirectional Reset Pin Interfacing

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