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XC6101~XC6107, XC6111~XC6117 Series

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OPERATIONAL EXPLANATION

The XC6101~XC6107, XC6111~XC6117 series compare, using the error amplifier, the voltage of the internal voltage

<RESETB / RESET Pin Output Signal>

reaches the release voltage. If neither rising nor falling signals are applied to the WD pin within the watchdog timeout period,

reaches the release voltage. If neither rising nor falling signals are applied to the WD pin within the watchdog timeout period,

<Hysteresis>

When the internal comparator output is high, the NMOS transistor connected in parallel to R3 is turned ON, activating the

hysteresis circuit. The difference between the release and detect voltages represents the hysteresis range, as shown by the

following calculations:

* Please refer to the block diagrams for R1, R2, R3 and Vref.

<Watchdog (WD) Pin>

The XC6101~XC6107, XC6111~XC6117 series use a watchdog timer to detect malfunction or “runaway” of the

microprocessor. If neither rising nor falling signals are applied from the microprocessor within the watchdog timeout period,

RESET/RESETB pin output returns to the release state (Please refer to the FUNCTION CHART). The timer in the watchdog

6.25msec.

<MRB Pin>

Using the MRB pin input, the RESET/RESETB pin signal can be forced to the detection state. When the MRB pin is driven

voltage level, leave the MRB pin open if unused (Please refer to the FUNCTION CHART). A diode, which is an input

on the MRB pin.

<Release Delay Time>

timeout period expires with no rising signal applied to the WD pin, until the RESET/RESETB pin output is released from the

200msec, 100msec, 50msec, 25msec, 3.13msec.

<Detect Delay Time>

RESETB pin output goes into the detection state.