MC33161 データシートの表示（PDF） - Motorola => Freescale

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MC33161

Universal voltage monitor

Motorola => Freescale 

MC34161 MC33161

Figure 19. Positive Voltage Window Detector

VCC

8

Input VS

CH2 V4

V3

CH1

V2

V1

VHys2

VHys1

Output

Voltage

Pins 5, 6

Gnd

VCC

‘ON’

Gnd

LED ‘OFF’

LED ‘ON’ ‘OFF’ LED ‘ON’

VS 1

2.54V

Reference

–

R3

7

++

+

2.8V

2+ –

6

R2

1.27V

–

++

+

0.6V

R1

3+ –

1.27V

5

4

The above figure shows the MC34161 configured as a positive voltage window detector. This is accomplished by connecting channel 1 as an undervoltage detector,

and channel 2 as an overvoltage detector. When the input voltage VS falls out of the window established by V1 and V4, the LED will turn ‘ON’. As the input voltage

falls within the window, VS increasing from ground and exceeding V2, or VS decreasing from the peak towards ground and falling below V3, the LED will turn ‘OFF’.

With the dashed line output connection, the LED will turn ‘ON’ when the input voltage VS is within the window.

For known resistor values, the voltage trip points are:

+ * ǒ ) ) Ǔ + * ǒ ) ) Ǔ V1

(Vth1

VH1)

R3

R1 R2

1

V3

(Vth2

VH2)

R2 R3

R1

1

+ ǒ ) ) Ǔ + ǒ ) ) Ǔ V2

Vth1

R3

R1 R2

1

V4

Vth2

R2 R3

R1

1

For a specific trip voltage, the required resistor ratio is:

* R2

+ * * R1

V3(Vth2

V1(Vth1

VH2)

VH1)

1

* ) R3 V3(V1 Vth1 VH1)

+ * R1

V1(Vth2 VH2)

+ * R2

R1

V4 x Vth2

V2 x Vth1

1

+ * R3 V4(V2 Vth1)

R1

V2 x Vth2

Figure 20. Negative Voltage Window Detector

VCC

8

2.54V

Gnd

1

Reference

CH2 V1

Input –VS

V2

CH1 V3

V4

VHys2

VHys1

–

R3

7

++

+

2.8V

2+ –

6

R2

1.27V

–

++

Output

Voltage

Pins 5, 6

VCC

‘ON’

Gnd

LED ‘OFF’

LED ‘ON’ ‘OFF’ LED ‘ON’

+

0.6V

R1

3+ –

1.27V

5

–VS

4

The above figure shows the MC34161 configured as a negative voltage window detector. When the input voltage –VS falls out of the window established by V1 and

V4, the LED will turn ‘ON’. As the input voltage falls within the window, –VS increasing from ground and exceeding V2, or –VS decreasing from the peak towards ground

and falling below V3, the LED will turn ‘OFF’. With the dashed line output connection, the LED will turn ‘ON’ when the input voltage –VS is within the window.

For known resistor values, the voltage trip points are:

+ )* ) V1

R1(Vth2 Vref)

R2 R3

Vth2

+ *) * ) * V2

R1(Vth2 VH2 Vref)

R2 R3

Vth2

VH2

+ ) * ) V3

(R1

R2)(Vth1

R3

Vref)

Vth1

+ ) * * ) * V4

(R1

R2)(Vth1 VH1

R3

Vref)

Vth1

VH1

For a specific trip voltage, the required resistor ratio is:

* R1

) + * R2 R3

V1 Vth2

Vth2 Vref

* ) R1

) + * * R2 R3

V2 Vth2 VH2

Vth2 VH2 Vref

* R3

) + * R1 R2

Vth1 Vref

V3 Vth1

* * R3

) + ) * R1 R2

Vth1 VH1 Vref

V4 VH1 Vth1

MOTOROLA ANALOG IC DEVICE DATA

9

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