CPC5712

CPC5712
Voltage Monitor with Detectors
INTEGRATED CIRCUITS DIVISION
Features
Description
• CPC5712 Outputs:
• Two Independent Programmable Level Detectors
with Programmable Hysteresis
• Fixed-Level Polarity Detector with Hysteresis
• Differential Linear Output
• Minimum External Components
• Excellent Common-Mode Rejection Ratio
(CMRR) > 55dB
• Application circuits meet isolation requirements of
worldwide telephony standards
• Worldwide telephone network compatibility
• Single Supply Operation, 3.0V to 5.5V
• High differential input impedance
• Very low common-mode input impedance
• Fixed Gain
• TTL Compatible CMOS Logic Level outputs
• Small SOP 16-Pin package
The CPC5712 is a special purpose Voltage Monitor
with Detectors integrated circuit that is used in various
high-voltage telephony applications such as VoIP
gateways and IP-PBXs. The device monitors the
TIP/RING potential through a high-impedance divider
(resistor isolation) to derive two programmable signal
level detects, polarity information, and a scaled
representation of the phone line voltages. In use, the
resistor divider and the high input impedance of the
CPC5712 make the circuit practically undetectable on
the line.
The two voltage-level detects are programmed with
external resistors, which gives the designer complete
freedom with respect to line voltage detection levels.
The level settings also have programmable hysteresis
to prevent false triggering conditions. Detection of
these levels allows the user to determine the condition
of the line.
Applications
• VoIP Gateways, IP-PBX, xDSL
• TIP/RING Monitoring
• Line-In-Use Detection
• Polarity Detection for Caller ID, Enhanced 911
• Battery Detection, PSTN Check
• Non-telephony voltage level detection applications
• Instrumentation
• Industrial Controls
This device can also be used in non-telephony
applications such as instrumentation and industrial
controls, especially when a low-level differential level
needs to be detected in the presence of a large
common-mode voltage.
Ordering Information
e3
Pb
Part
Description
CPC5712U
CPC5712UTR
16-Pin SOP (100/Tube)
16-Pin SOP (2000/Reel)
CPC5712 With Support Components
V+
1
VCC
RIN1
TIP
OUT+ 5
7
IN+
+
8
IN-
-
RDIFF
RING
RIN2
CPC5712
G=5
OUT - 6
POLARITY 4
OUT+
DET1 3
DET2 2
VREF
GND
16
15
14
VL1
9
VH1
10
R1
DS-CPC5712-R02
+ Analog Output
R2
VL2
11
R3
- Analog Output
Polarity Output
Voltage Level Detect 1
Voltage Level Detect 2
VH2
12
R4
13
R5
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CPC5712
INTEGRATED CIRCUITS DIVISION
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Package Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
3
3
3
4
4
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Line Side Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Monitor Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Detector Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Detector Threshold Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5
5
5
5
6
6
3. Design Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Differential Input Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Voltage Detector Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1 Calculate Resistor Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2 Verify Resistor Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 High Voltage Detection Designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
8
8
8
8
9
9
4. Manufacturing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Moisture Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 ESD Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Board Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 CPC5712U 16-Pin SOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 CPC5712UTR Tape and Reel Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
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10
10
10
10
11
11
R02
CPC5712
INTEGRATED CIRCUITS DIVISION
1. Specifications
1.1 Package Pinout
1.2 Pin Description
Pin
DET2
DET1
POLARITY
OUT+
OUTIN+
IN-
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
Supply Voltage
2
3
4
5
6
7
8
Output, Detector 2
Output, Detector 1
Output, represents polarity of input signal
Output, amplifier non-inverting
Output, amplifier inverting
Input, amplifier non-inverting
Input, amplifier inverting
VH2
9
VL2
10
VL1
11
VH1
12
VL2
13
VH2
14
15
16
Not Used
Not Used
GND
GND
Not Used
Not Used
VH1
VL1
VREF
Description
1
DET2
DET1
POLARITY
OUT+
OUTIN+
INVREF
CPC5712 Pinout
VCC
Name
Output, Reference used to set threshold levels
Input, sets DET1 low voltage detection
threshold
Input, sets DET1 high voltage detection
threshold
Input, sets DET2 low voltage detection
threshold
Input, sets DET2 high voltage detection
threshold
Do not use, connect to ground
Do not use, connect to ground
Ground
1.3 Absolute Maximum Ratings
Parameter
VCC
Storage temperature
Power dissipation
Min
Max
Unit
-0.3
-40
-
6.0
+125
50
V
°C
mW
Absolute maximum ratings are stress ratings. Stresses in excess of these ratings can cause permanent
damage to the device. Functional operation of the device at conditions beyond those indicated in the
operational sections of this data sheet is not implied.
1.4 ESD Rating
ESD Rating (Human Body Model)
4000 V
R02
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CPC5712
INTEGRATED CIRCUITS DIVISION
1.5 Recommended Operating Conditions
Parameter
Symbol
Min
Max
Units
VCC
3.0
5.5
V
| ICM |
-
12
A
VCC
Input Common Mode Current 1
VREF
Loading 2
Resistive
Capacitive
OUT+ and OUT- Loading
Capacitive
Current
Operating Temperature
1
2
RREF
20
1000
k
CREF
-
220
pF
COUT
COUT
300
pF
IOUT
-500
+500
A
TA
-40
+85
°C
Input common-mode current per pin must not exceed limit.
Resistive and Capacitive loads on the VREF output must remain within these limits.
1.6 Electrical Characteristics
Unless otherwise specified, minimum and maximum
values are guaranteed by production testing.
Typical values are characteristic of the device at 25°C
and are the result of engineering evaluations. They are
Parameter
DC Characteristics
provided for informational purposes only and are not
part of the manufacturing testing requirements.
Unless otherwise noted, all electrical specifications
are listed for TA=25°C and VCC = 3V to 5.5V.
Conditions
Symbol
Min
Typ
Max
Units
VCC
3
-
5.5
V
1.1
1.5
1.42
1.72
1.9
2.4
mA
RIN
VOUT+
VOUT-
10
-5
-5
-
5
5
M
mV
mV
-
-20
-
20
mV
IIO
-45
-
45
nA
Supply Voltage
Supply Current
VREF and all outputs open,
Pins 14 and 15 = Gnd.
VCC=3V
VCC=5.5V
ICC
AC Characteristics
Differential Input Resistance
Output Offset Voltage
Comparator Input Offset Voltage
Input Offset Current
Reference Voltage
Common-Mode Rejection Ratio
Differential Gain
RDIFF = 806k,
VIN=0V
RDIFF = 806k,
From VIN through to the
comparators, Measured at
VOUT+ and VOUTICM=0A
VCC=3V, VCC=5.5V
IREF=0A, IREF=-80A
ICM < 12A, 0-120 Hz
0 < f < 20kHz
VREF
1.4
1.5
1.6
V
CMRR
-
55
4.85
5.00
5.15
dB
-
Differential signal applied to
IN+ and IN-
VIN
±22
±37
±54
mV
IOH=-5mA
IOL=5mA
VOH
VOL
VCC-0.6
-
0.4
V
V
Polarity Detection Characteristics
Polarity Detection Threshold Voltage
Digital Output Characteristics
Output Voltage, High
Output Voltage, Low
4
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R02
CPC5712
INTEGRATED CIRCUITS DIVISION
2. Functional Description
2.1 Overview
Clare’s CPC5712 is a generalized building block IC for
telephone systems that is connected, through a
resistor network, to the TIP and RING leads. From the
TIP and RING line voltage, the CPC5712 provides a
buffered and amplified differential linear representation
output voltage, a polarity detect signal, and two
programmable level detect signals. From these
detected levels, certain line conditions can be inferred
such as Line-In-Use and battery presence. The
CPC5712 provides TTL/CMOS compatible outputs for
the polarity and programmable level detectors.
The polarity detect and the two programmable level
detects all incorporate hysteresis to provide noise
immunity and eliminate rapid output state changes in
the presence of large voice signals. Hysteresis
settings for the two programmable level detects are
independently programmable; however, the polarity
hysteresis is internally fixed.
The high and low thresholds of the two programmable
level detectors are set with external resistors, the
selection of which is described below.
Positive polarity, POLARITY = HIGH, is indicated for
an OUT+ level greater than the OUT- level while
negative polarity is indicated for an OUT+ level less
than OUT-. For a logic-high polarity detect output with
a normal battery feed of TIP more positive than RING,
the amplifier IN+ will need to be connected to the TIP
lead via the high impedance input resistors. Detection
and hysteresis thresholds for polarity are internal to
the device.
The CPC5712 is connected to the TIP/RING interface
through a high-impedance resistor divider to attenuate
the signal. The resistors in the divider network
become a distributed resistive isolation barrier
between the high-voltage line side and the low voltage
side. The attenuator and the CPC5712 present a high
impedance to TIP and RING, making the circuit almost
undetectable when used as a monitoring device.
2.2 Line Side Interface
IN+, IN-: Analog inputs. The differential signal across
these inputs is amplified and brought out to the pins
OUT+ and OUT-. A nominal reference voltage bias of
1.5V is applied to IN+ and IN- by circuitry internal to
R02
the chip. Because the voltage across TIP and RING
can be very large, TIP and RING cannot be directly
connected to IN+ and IN-. A resistor divider network
defined by RIN1, RIN2 and RDIFF attenuates the high
voltage signal across TIP and RING (see ). The
resulting low voltage differential signal across RDIFF is
applied to the inputs IN+ and IN-. Resistors RIN1, RIN2
and RDIFF are external resistors that must be supplied
by the user.
Any component sizing and value recommendations
given in the circuits described in this document will
need to be reviewed with regard to the regulatory and
safety requirements for each particular application. For
example, the resistors selected for RIN1 and RIN2,
shown in , are recommended to be a pair of 1206
surface mount size resistors in series to provide for
high-voltage isolation.
2.3 Monitor Output
OUT+, OUT-: Analog outputs. The differential signal
across these outputs is the same as the differential
input signal, except there has been a differential gain
of 5 applied to it. A nominal reference voltage bias of
1.5V is applied to OUT+ and OUT- by circuitry internal
to the chip.
2.4 Detector Outputs
DET2, DET1, POLARITY: Digital outputs. These
signals show whether threshold 2 has been crossed,
threshold 1 has been crossed, and the polarity of the
TIP to RING potential.
When configured as shown in , POLARITY will be high
after the TIP to RING potential (TIP more positive than
RING) has increased to a nominal 2V. POLARITY will
switch low after the TIP to RING voltage decreases to
approximately -2V. For example, if the TIP to RING
voltage starts at -48V, POLARITY will be low. As the
TIP to RING voltage increases to +1V, POLARITY will
remain low. As the TIP to RING voltage increases
beyond it’s internally set positive threshold, the
POLARITY output will switch high. POLARITY will
remain high until the TIP to RING voltage decreases
below it’s internally set negative threshold. Because
these polarity thresholds are set internally they are not
user adjustable.
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CPC5712
INTEGRATED CIRCUITS DIVISION
In the case of the detector 2 switching points, DET2
will be low after the |TIP/RING| voltage has decreased
below a threshold set at VL2. DET2 will not transition
high until after the |TIP/RING| voltage has increased
above a threshold set at VH2. This |TIP/RING| voltage
will be larger than the threshold set at VL2. As an
example, the voltage at VL2 represents a |TIP/RING|
threshold of 20V and VH2 represents a TIP/RING
threshold of 22V. DET2 will be low if the |TIP/RING|
voltage decreases below 20V, and it will remain low
until the |TIP/RING| voltage increases above 22V.
DET2 will change states for both positive and negative
values of TIP/RING voltage as represented by
|TIP/RING|. This means that DET2 will also be low if
the TIP/RING voltage decreases below -20V and will
remain low until the TIP/RING voltage increases
beyond -22V. The user must rely on POLARITY to
determine whether the TIP/RING threshold changed
due to a positive or negative differential signal since
DET2 does not contain any polarity information.
VREF: An analog output that is similar to the DC bias
level that is applied to OUT+ and OUT-. This voltage is
brought off chip so that it can be used to define
threshold detection levels. Load capacitance on this
pin must be kept less than the value recommended in
the table Recommended Operating Conditions.
The total load resistance on this pin must be within the
range specified in the table Recommended
Operating Conditions.
DET1 behaves similarly to DET2, except that it is
triggered based on the voltage set at VL1 and VH1.
This means that DET1 will be low after the |TIP/RING|
voltage has decreased below the value set by the
voltage at VL1 and will not change high until after the
|TIP/RING| voltage has increased above the value set
by the voltage at VH1. DET1 does not give any polarity
information for the same reasons as defined for DET2.
In the application circuit provided, the TIP/RING
threshold levels of DET2 will always be higher than the
threshold levels of DET1.
Then use the following algorithm to find the values of
R2, R3, R4 and R5.
2.5 Detector Threshold Operation
VL1, VH1, VL2, and VH2: Inputs used to set the
|TIP/RING| threshold levels that are to be detected.
VH1 and VL1 are used to set the high and low threshold
levels. The difference between VH1 and VL1 sets the
Resistors R1, R2, R3, R4 and R5 are external
resistors, which must be provided by the user. The
selection of the resistors determines the voltages at
VL2, VH2, VL1 and VH1 and therefore the threshold and
hysteresis values for the 2 detectors.
The values for R1, R2, R3, R4, and R5 are easily
determined. Select voltage levels for the 1st and 2nd
threshold and hysteresis settings such that:
VH2 > VL2 > VH1 > VL1
1. Select a value for R1.
2. R2 = (R1(VH1-VL1)) / VL1
3. R3 = (R1(VL2-VH1))/ VL1
4. R4 = (R1(VH2-VL2)) / VL1
5. R5 = (R1(VREF/A-VH2)) / VL1
• VREF = 1.5V
• A = (2.5 (RDIFF)) / (RIN1 + RIN2 + RDIFF), which
typically calculates to 0.05; in this case: 0.04938.
See Figure 1.
Also, as shown in the table of Recommended
Operating Conditions, the resistive load on the VREF
pin must fall within the range:
20k < (R1 + R2 + R3 + R4 + R5) < 1M
hysteresis for the 1st threshold level. VH2 and VL2 are
used to set the threshold and hysteresis for the 2nd
threshold level. There is a digital output for both the 1st
and 2nd threshold levels that shows when the
|TIP/RING| voltage has crossed a threshold level and
when it has exceeded the configured hysteresis level.
This was explained in the DET1 and DET2 definitions.
In general, the digital output will be low when the
|TIP/RING| voltage has fallen below the VL# level and
will change high again once the |TIP/RING| voltage
has risen above the VH# level.
6
2.6 Power Connections
VCC, Ground: Power supply pins. These are used to
supply voltage and ground to the chip.
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R02
CPC5712
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.
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.
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
Figure 1 CPC5712 Application Circuit
V+
0.1µF
1
VCC
CPC5712
OUT+ 5
TIP
806K
1%
RING
7
IN+
8
IN-
+
-
G=5
OUT - 6
(4)
10M
1%
1206
POLARITY 4
OUT+
DET1 3
DET2 2
VREF
GND
16
15
14
VL1
9
VH1
10
R1
26.7K
1%
R02
+ Analog Output
R2
VL2
11
R3
VH2
12
R4
− Analog Output
Polarity Output
Voltage Level Detect 1
Voltage Level Detect 2
13
R5
17.8K 61.9K 26.7K 137K
1%
1%
1%
1%
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CPC5712
INTEGRATED CIRCUITS DIVISION
3.1 Line Interface
3.3 Voltage Detector Design
Between the CPC5712 and the TIP/RING line is a
high impedance resistive divider network that provides
sufficient impedance to meet the barrier insulation
specifications in safety regulations and comply with
the on-hook DC leakage to ground requirements from
the various network compatibility specifications.
From the application requirements given above, the
desired LIU detector threshold voltages are therefore:
• VH2 = 15V
• VL2 = 12V
and the detector thresholds for the LOOP detector are:
To ensure regulatory compliance, a 20M or greater
resistance is required from the individual TIP and
RING leads to the IN+ and IN- inputs. For most
applications where the tip and ring interface does not
have a ground referenced surge protector, Clare
recommends using two 1206-size 10M resistors in
series to provide the minimum impedance and to meet
surge requirements. Resistors having a smaller
physical footprint may be used when ground
referenced surge protection is available.
• VH1 = 5V
• VL1 = 3V
3.3.1 Calculate Resistor Values
From the design equations provided in
Section 2.5 “Detector Threshold Operation” on
page 6 this gives:
In practice, each 1206-size resistor is capable of
withstanding the 2000V peak waveforms typical of
lightning surges on the phone line. Hence, two 1206
resistors can withstand 4000V lightning pulses.
• R1=R1
• R2=0.666667 R1
• R3=2.333333 R1
• R4=R1
• R5=5.125558 R1
Summing these equations provides the following
result:
3.2 Differential Input Resistor
R1+R2+R3+R4+R5 = 10.12556 R1
and since this sum is bound by:
20k < (R1 + R2 + R3 + R4 + R5) < 1M
The differential input resistor placed across the IN+
and IN- inputs provides two functions.
this reduces to: 20k < (10.12556 R1) < 1M
From the application perspective, this component
provides a scaled down representation of the tip and
ring line voltage to the CPC5712 inputs. The voltage
applied to the inputs is easily calculated because it is
derived from a simple resistive divider comprising the
tip and ring input resistors and the differential input
resistor.
For improved performance, the CPC5712 signal path
is trimmed at the factory to reduce comparator
detection errors caused by offset currents and
voltages. The CPC5712’s input offset effects are
reduced by trimming the device with an 806kinput
resistor. Using any other value resistor at the inputs
negates the trim and introduces offset errors.
Taking into account the additional constraint of resistor
tolerance, 1% in this example, the range of allowable
values for R1 is further reduced and becomes:
1.995k < R1 < 97.782k permitting a value
for R1 to be chosen.
Selecting a standard value from the E96, 1% table for
R1 of 26.7k the calculated values for the remaining
resistors becomes:
•
•
•
•
R2=17.8k
R3=62.3k
R4=26.7k
R5=136.85k
Since the calculated values of R3 and R5 are not
standard values, a reasonable compromise for these
resistors is: R3=61.9k, R5=137k. See Figure 1.
8
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CPC5712
INTEGRATED CIRCUITS DIVISION
3.3.2 Verify Resistor Selection
Once the resistor values are chosen it is necessary to
back calculate the nominal detector thresholds.
To do this the following equations are provided for two
variables:
R  = R IN1 + R IN2 + R DIFF
where R is the sum of the resistive interface network
and RREF is the sum of the resistor divider network on
the reference voltage output.
The following values are also needed to perform the
threshold calculations. They are:
VREF = 1.5V
RIN1 = RIN2 = 2 x 10M = 20M
RDIFF = 806k
G=2.5 (Single ended gain of input amplifier)
which gives:
• R = 40.806M and
• RREF = 270.1k
The threshold equations are:
VL1 = 3.00280V
VH1 = 5.00467V
VL2 = 11.9662V
VH2 = 14.9690V
3.4 High Voltage Detection Designs
Designs that require higher detection levels greater
than approximately 17V will necessitate a different
voltage divider ratio to accommodate the operational
range of the CPC5712’s internal circuitry. Changes to
the input resistor divider network are restricted to the
high impedance resistors from the tip and ring leads to
the IN+ and IN- inputs. Changing the differential input
resistor value from 806k is not recommended as this
will introduce offset errors. The degree of offset error
caused by changing this component’s value is not
measured and therefore not calculable.
The design procedure for higher voltage detect levels
is the same as presented above. Remember to begin
with the equations shown in Section 2.5 “Detector
Threshold Operation” on page 6 and use the
updated value for the “A” term based on the new input
resistor values.
1.
V REF  R   R1
V L1 = ---------------------------------------G  R DIFF  R REF
2.
V REF  R    R1 + R2 
V H1 = ----------------------------------------------------G  R DIFF  R REF
3.
V REF  R    R1 + R2 + R3 
V L2 = -----------------------------------------------------------------G  R DIFF  R REF
4.
V REF  R    R1 + R2 + R3 + R4 
V H2 = -------------------------------------------------------------------------------G  R DIFF  R REF
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•
•
•
•
As can be seen, the error from using standard value
resistors is less than 0.1% for VL1 and VH1 and is less
than 0.3% for VL2 and VH2.
R REF = R1 + R2 + R3 + R4 + R5
•
•
•
•
Using the selected standard 1% resistor values, and
back calculating to the threshold voltages produces
these results:
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CPC5712
INTEGRATED CIRCUITS DIVISION
4. Manufacturing Information
4.1 Moisture Sensitivity
All plastic encapsulated semiconductor packages are susceptible to moisture ingression. IXYS Integrated
Circuits Division classified all of its plastic encapsulated devices for moisture sensitivity according to the
latest version of the joint industry standard, IPC/JEDEC J-STD-020, in force at the time of product
evaluation. We test all of our products to the maximum conditions set forth in the standard, and guarantee
proper operation of our devices when handled according to the limitations and information in that standard as well as
to any limitations set forth in the information or standards referenced below.
Failure to adhere to the warnings or limitations as established by the listed specifications could result in reduced
product performance, reduction of operable life, and/or reduction of overall reliability.
This product carries a Moisture Sensitivity Level (MSL) rating as shown below, and should be handled according to
the requirements of the latest version of the joint industry standard IPC/JEDEC J-STD-033.
Device
Moisture Sensitivity Level (MSL) Rating
CPC5712U
MSL 1
4.2 ESD Sensitivity
This product is ESD Sensitive, and should be handled according to the industry standard
JESD-625.
4.3 Reflow Profile
This product has a maximum body temperature and time rating as shown below. All other guidelines of
J-STD-020 must be observed.
Device
Maximum Temperature x Time
CPC5712U
260°C for 30 seconds
4.4 Board Wash
IXYS Integrated Circuits Division recommends the use of no-clean flux formulations. However, board washing to
remove flux residue is acceptable, and the use of a short drying bake may be necessary. Chlorine-based or
Fluorine-based solvents or fluxes should not be used. Cleaning methods that employ ultrasonic energy should not be
used.
Pb
10
e3
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CPC5712
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4.5 CPC5712U 16-Pin SOP Package
0.254 MAX - 0.178 MIN
(0.010 MAX - 0.007 MIN)
4.902 ± 0.102
(0.193 ± 0.004)
PCB Land Pattern
0.712 ± 0.051
(0.028 ± 0.002)
3.812 ± 0.076
(0.150 ± 0.003)
5.40
(0.213)
6.045 ± 0.153
(0.238 ± 0.006)
1.55
(0.061)
Pin 1
0.635
(0.025)
0.254 ± 0.051
(0.010 ± 0.002)
0.762 MAX - 0.508 MIN
(0.030 MAX - 0.020 MIN)
0.635
(0.025)
0.051 MIN, 0.305 MAX
(0.002 MIN, 0.012 MAX)
1.447 ± 0.076
(0.057 ± 0.003)
0.40
(0.0157)
Dimensions
mm
(inches)
1.829 MAX
(0.072 MAX)
4.6 CPC5712UTR Tape and Reel Packaging
330.2 DIA.
(13.00 DIA.)
Top Cover
Tape Thickness
0.102 MAX.
(0.004 MAX.)
W=12.00
(0.472)
B0=5.30
(0.209)
K0= 2.10
(0.083)
A0=6.50
(0.256)
P=8.00
(0.315)
User Direction of Feed
Embossed Carrier
Embossment
Dimensions
mm
(inches)
NOTE: Tape dimensions not shown comply with JEDEC Standard EIA-481-2
For additional information please visit www.ixysic.com
IXYS Integrated Circuits Division makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and
reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed
or implied. Except as set forth in IXYS Integrated Circuits Division’s Standard Terms and Conditions of Sale, IXYS Integrated Circuits Division assumes no liability
whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a
particular purpose, or infringement of any intellectual property right.
The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into
the body, or in other applications intended to support or sustain life, or where malfunction of IXYS Integrated Circuits Division’s product may result in direct physical
harm, injury, or death to a person or severe property or environmental damage. IXYS Integrated Circuits Division reserves the right to discontinue or make changes
to its products at any time without notice.
Specification: DS-CPC5712-R02
© Copyright 2012, IXYS Integrated Circuits Division
All rights reserved. Printed in USA.
12/22/2012
R02
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11