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DS1677

Portable System Controller

Dallas Semiconductor -> Maxim Integrated 

DS1677

DETAILED DESCRIPTION

The microprocessor monitor circuitry of the DS1677 provides three basic functions. First, a precision

temperature-compensated reference and comparator circuit monitors the status of VCC. When an out-of-

tolerance condition occurs, an internal power-fail signal is generated which forces the to RST the active

state. When VCC returns to an in-tolerance condition, the RST signal is kept in the active state for 250ms

to allow the power supply and processor to stabilize. The DS1677 debounces a pushbutton input and

guarantees an active RST pulse width of 250ms. The third function is a watchdog timer. The DS1677 has

an internal timer that forces the RST signal to the active state if the strobe input is not driven low prior to

watchdog timeout.

The DS1677 also provides a 3-channel 8-bit successive approximation ADC. The converter has an

internal 2.55V (typical) reference voltage generated by an on-board band-gap circuit. The ADC is

monotonic (no missing codes) and has an internal analog filter to reduce high-frequency noise.

OPERATION

The block diagram in Figure 1 shows the main elements of the DS1677. The following paragraphs

describe the function of each pin.

DS1677 BLOCK DIAGRAM Figure 1

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