555 Timer.

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Presentation transcript:

555 Timer

Pin configuration The 555 timer consists of; Two voltage comparators A bi-stable flip flop A discharge transistor and a resistor divider network.

Internal Circuit Of 555 Timer

+ C1 C2 Q RD SD 5K T 2 4 5 6 7 8 3 1 VCC Reset VA Output VB RS-FF Control Voltage VA Threshold Output Trigger VB Discharge DischargeTransistor GND RS-FF Voltage Divider Comparator

The result for comparing 2/3 VCC + C1 C2 . 5K VA VB VCC RD SD 5 6 2 RD SD V6 V2 <2/3 VCC <1/3 VCC 1 >2/3 VCC >1/3 VCC 1 <2/3 VCC >1/3 VCC 1 >2/3 VCC <1/3 VCC Not permitted 1/3 VCC

Q RD SD T output RD SD Q T 1 1 off 1 on 1 1 V6 V2 <2/3 UCC 1 off 1 on 1 1 remain remain V6 V2 <2/3 UCC <1/3 UCC >2/3 UCC >1/3 UCC Q T 1 保持 on off remain remain

Monostable Multivibrator & Waveforms

uO Monostable Multivibrator (One-shot) Operation +VCC 4 8 R1 5 VA + 6 uC R1 +VCC ui VCC + C1 C2 Q RD SD 5K VA VB T 1 3 4 8 (Re) uO 6 5 2 7 1 Steady state 1 1 1 Q=0 >2/3 VCC on (grand)

Monostable Multivibrator (One-shot) Operation uC R1 +VCC ui VCC + C1 C2 Q RD SD 5K VA VB T 1 3 4 8 (reset) uO 6 5 2 7 Transiet state 1 1 1 Q=1 < 1/3 UCC off (grand)

Monostable Multivibrator(One-shot) Operation uc R1 +VCC ui VCC + C1 C2 Q RD SD 5K VA VB T 1 3 4 8 (reset) uO 6 5 2 7 1 Steady state 1 1 1 1 Q=1 Q=0 >2/3 VCC (grand)

ui t uC t uO t What is a monostable multivibrator? With one stable state uC t Normally in its stable state,to change to its unstable state only when triggered 2/3UCC uO t Once triggered,to remain in its unstable state for a predetermined length of time and then return to its stable state automatically tp =RC ln3=1.1RC

Astable Multivibrator & Waveforms

2) Astable Multivibrator(Oscillator) UCC + C1 C2 Q RD SD . 5K VA VB T 1 3 2 4 5 6 7 8 (grand) uO charge . uC R1 R2 + – 1 1 1 >2/3 UCC <1/3 UCC first uC=0 1 RD=1 SD=0 discharge

. uC uO uO 4 8 5 6 2 7 1 3 +VCC uC C R1 R2 tp1 tp2 t tp1 =(R1+R2)C ln2=0.7(R1+R2)C tp2 =R2C ln2=0.7R2C T=tp1+tp2 =0.7(R1+2R2)C What is an astable multivibrator? Duty Cycle = tp1/T With one stable state

Applications using 555 timer A light dimmer ; A car tachometer Traffic Lights ; Infra Red (IR) remote control ;