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CPC5712

Voltage Monitor with Detectors

IXYS CORPORATION 

INTEGRATED CIRCUITS DIVISION

3. Design Example

An application circuit that is based on information

discussed in Section 2.5 “Detector Threshold

Operation” on page 6 is shown in Figure 1.

In the following telephony design example, it is desired

to have a Line-In-Use (LIU) detector set at 12V with a

hysteresis of 3V, and a loop or battery-presence

(LOOP) detector set at 5V with a hysteresis of 2V. The

CPC5712

LIU detector will monitor the Public Switched

Telephone Network (PSTN) twisted pair TIP and RING

leads for a voltage level that indicates a device on the

line is off-hook while the LOOP detector monitors for

the presence of battery feed. In this example

detector 2 (DET2) will be the LIU detector as it has the

greater voltage detect thresholds.

Figure 1 CPC5712 Application Circuit

TIP

RING

V+

0.1µF

1

VCC

CPC5712

(4)

10M

1%

1206

7 IN+ +

806K

1%

G=5

- 8 IN-

OUT+ 5

OUT - 6

GND

VREF

16 15 14 9

POLARITY 4

OUT+

DET1 3

VL1

VH1 VL2

VH2

DET2 2

10 11 12 13

R1

26.7K

1%

R2 R3 R4 R5

17.8K 61.9K 26.7K 137K

1% 1% 1% 1%

+ Analog Output

− Analog Output

Polarity Output

Voltage Level Detect 1

Voltage Level Detect 2

R02

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