M3000

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 6

www.unisonic.com.tw

QW-R502-473.a

FUNCTIONAL DESCRIPTIONS

1. Re-Triggerable Mode

Re-Triggerable Waveform

Operational amplifier OP1 composed sensor signal pre-processing circuit. The amplified signal coupled to the

operational amplifier OP2, and elevated DC level to VM (≈0.5VDD), The output signal V2 input to Bi-directional level

detector(COP1&COP2), detected the effective signal Vs. As the VH≈0.7VDD, VL≈0.3VDD, while VDD=5V, it is

immune to the ±1V noise interference and can improve system reliability.

COP3 is a condition comparator. When the input voltage Vc<VR(≈0.2VDD), COP3 output is low, it disabled the

Vs transmission to State Control circuit; When Vc>VR, COP3 output is high, chip access to extension time period.

When pin A connect to "0", any change of V2 have been ignored until the end of Tx period, which called

non-retriggerable mode. When the Tx period ended, Vo jump back to the low level, chip access to the lock period Ti.

During the Ti period, any changes of V2 can not make Vo jumping to valid state (high level), it can inhibit a variety of

interference when the load changed.

2. Non-Retriggerable mode

V2

A

Tx

Ti

Tx

Ti

Non-Retriggerable Waveform

During the time of Vc="0", A="0"，signal Vs can not trigger Vo to a valid state; When Vc="1", A="1", Vs can

repeatable trigger Vo to the valid state, and keep the state in Tx period.

In the Tx period, if Vs jump to "1", then Vo extend to an another Tx; if Vs keep "1" state, Vo maintains the valid

state; if Vs keep "0 "state, after the period of Tx, Vo change to invalid state, and in the Ti time, any change of Vs can

not trigger Vo to a valid state.