Le9540
Dual Ringing Subscriber Line Interface Circuit
VE950 Series
Data Sheet
Features
•
•
Dual Architecture Integrates Two Channels of
SLIC Functionality
High Voltage High Bandwidth Design Supports 7-
kHz Wide Band Applications
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-
•
•
Up to –145 V ringing battery Le9540D
Up to –100 V ringing battery Le9540C
Version 7
Document Code
May 2019
PD-000303860
Ordering Information
Le9540CUQC
Le9540DUQC
40-pin QFN
40-pin QFN
Tray
Tray
Tape and Reel
Tape and Reel
Common Protection Reference Output
Operation Control and Status Report through
Serial Interface with Reset
-
-
SLIC Operation State/DC Current Limit/Test
Load Enable
DC Loop Closure/Ring Trip/Thermal Shutdown
Scan (Minimal Power Dissipation)
Active Forward (Default Power Up State)
Active Forward ICV
Active Reverse
Tip Open
Wink
Ringing
Disconnect
1. All devices are in green packages.The green package is Halo-
gen free and meets RoHS Directive 2002/95/EC of the Euro-
pean Council to minimize the environmental impact of electrical
equipment.
Description
•
Channel Independent Eight Operating States
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-
-
-
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FI
The Le9540 Dual Ringing SLIC device is a dual-
channel device optimized to provide battery feed,
ringing, and supervision on voice loops found in short-
loop VoIP applications. This device is optimized to
interface to the Broadcom BCM3383/85 SoC, or
equivalent. The SLIC operational control and status
report for both channels are communicated through a
serial interface with reset. The common protection
reference output can trigger either a common
protection device or per channel devices for both
channels. The SLIC supports wide-band applications.
R TF LT
GAIN = 13.67
V I TR
AAC
LO O P
S TA TU S
B A TTER Y
S U P P LY
an d
CO MMON
P R O TEC TI O N
R EF ER EN C E
S ER I A L
I N TER F A C E
R ES ET
EN
C LK
DIN
DOUT
VDD
I R EF
VCC
BIAS
AX
( I TR / 4 3 2 )
I TR
PT
C U R R EN T
S EN S E
PR
AR
+
–
RING
TES T
S W I TC H
TLD
DCF
RING P
G ai n = 1 5 0
AT
–
+
DC
F EED
V R EF
G ai n = 8
RCVP
AC
V R EF _ 1
V R EF _ 2
VBA T 1
V BAT 2
CPR
D
EN
TX I
V TX
-
•
•
•
•
Accepts driving signals from per channel voice
outputs as well as from PWM outputs
O
N
•
Per Channel Ringing Inputs for Optimized
Interface to BRCM SoC Devices
DC Current Limited in Active/Scan/Tip Open
States
Thermal Shutdown Protection with Hysteresis
Test Load Switch Supports integrated test
algorithms
C
Loop Start, Ring Trip, and Ring-Ground
Detections with two thresholds
TI
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R EC TI F I ER
Le9540CUQCT 40-pin QFN
Le9540DUQCT 40-pin QFN
Common to both channels
RN
Applications
•
•
Optimized design to work with BCM3383/85
Broadcom SoCs
Short loop residential gateways
One channel shown unless otherwise specified
Figure 1 - Block Diagram
1
Microsemi Corporation Confidential and Proprietary
Le9540
Table of Contents
Data Sheet
C
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operating States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Communication Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Environmental Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Line Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Serial Interface Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Serial Interface Operations and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Serial Interface Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Bit Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
In-rush Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Loop Closure and Ring Trip Detection Thresholds with Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Design Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Application Circuit Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
40-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Version 1 to Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Version 2 to Version 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Version 3 to Version 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Version 4 to Version 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Version 5 to Version 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Version 6 to Version 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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Microsemi Corporation Confidential and Proprietary
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Le9540
List of Figures
Data Sheet
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Microsemi Corporation Confidential and Proprietary
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Figure 1 - Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2 - 40 Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3 - Serial Interface Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 4 - Serial Interface Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 5 - Le9540 Basic Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 6 - Metallic PSRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 7 - Longitudinal PSRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 8 - Longitudinal Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 9 - AC Gains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 10 - Detection Thresholds with Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 11 - Protection Device Referenced to VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 12 - Protection Device Referenced to CPR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 13 - Shared Protection Device Referenced to CPR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 14 - Reference Schematic Interfacing Broadcom Codec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Le9540
Product Description
Data Sheet
The Le9540 device is a dual-channel device optimized to provide battery feed, ringing, and supervision on short
Plain Old Telephone Service (POTS) loops. This device is optimized to interface to Broadcom system-on-a-chip
(SoC) device for cable modem applications.
Power Supplies
The Le9540 device is powered by a Vcc for analog circuits of both channels, a VDD for the serial logic circuits and
a per channel VBAT for DC feed and power ringing. The maximum of VBAT is rated at –100 V for Le9540C and
–145 V for Le9540D. The VBAT is expected to be a full tracking supply. The device depends on the tracking power
supply to reduce the battery amplitude during off-hook conditions and by doing so may save overall operating
power consumption. The VBAT should be no more negative than –100V for Le9540D other than in ringing mode.
Also, when –145 V is used for ringing special care should be taken to prevent certain faults from happening, such
as tip to ring, tip or ring to ground, or similar alike.
Operating States
The Le9540 device uses a voltage-feed-current-sense architecture. Each channel of this device has active, scan,
tip open, wink and disconnect operation states. Power ringing is also provided to the subscriber loop through
amplification of a low-voltage input. The active forward state with the low (ILL) dc current limit and the test switch
turned off is the default power up state.
Active
There are three active states: Active Forward, Active Reverse and Active Forward ICV.
In the Active Forward state the DC feed voltage on PT is positive with respect to the voltage on PR. In the Active
Reverse state the DC feed voltage on PT is negative with respect to the voltage on PR.
In the Active Forward ICV state the PT voltage is forced to be near -20V. The channel will be operating with an
Increased Common mode Voltage (ICV).
Scan
Tip Open
The Tip Open state is the Scan state with high impedance into PT.
Wink
The Wink state is an Active state but the voltages on PT and PR are forced to be the same and near ground.
Disconnect
Both PT and PR are in high impedance.
C
Scan is a simple low-power operation state. It is designed primarily for on hook operation. It provides forward DC
feed with the voltage on PT positive with respect to the voltage on PR. The loop closure detector is active. The DC
feed current is limited and fixed. The AC transmission path and on-hook transmission are not active.
O
N
For AC operation the SLIC supports off-hook talk mode and on-hook transmission mode as may be required during
the quiet interval of ringing. The overhead is about 6 to 8 V, allowing for on-hook transmission of an undistorted
signal of 3.14 dBm into 900
Ω,
or 500mV of meter pulse.
FI
The DC feed current is limited and can be programmed to either ILL or ILH. There is in the order of a 10 kΩ slope to
the I/V characteristic in the current-limit region; thus, once in current limit, the actual loop current will increase
slightly as loop length decreases.
Microsemi Corporation Confidential and Proprietary
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Le9540
Ringing
Data Sheet
In the Ringing state the signals on RINGP and RN are amplified and provided to the tip/ring pair as the power
ringing signal. The signals on RINGP and RN may be a sine wave or a filtered square wave to produce a sine wave
or trapezoidal output. A DC offset may also be applied.
The signals on RINGP and RN are desirable to be referenced to V
REF
or near V
REF
potential for maximum dynamic
ranges on the inputs.
Communication Interface
A serial interface is used for device operational control and for device status reporting. For operational control
through DIN, the operation state, dc current limit and test load switch operation can be set on a per channel basis.
The upstream status reporting on DOUT are loop closure, ring trip and thermal shutdown. There are two loop
closure outputs related to two detection thresholds, two ring trip detection outputs related to two detection
thresholds, and one thermal shutdown indication for each channel.
The serial interface has a RESET which is active low. When the RESET pin is a logic 0 the device will enter its
default state of active forward with the low (ILL) dc current limit and the test switch turned off. This operation
controls both channel simultaneously. The RESET pin has an internal pull down.
Protection
Thermal
C
O
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In case of reaching the thermal shutdown temperature, the channel will automatically enter an all off state. Upon
cooling, the device will re-enter the state contained in the serial interface control registers. Hysteresis is built in to
prevent fast oscillation. This is a self protection operation. Thermal shutdown will not cause performance
degradation once the device goes back to normal operation.
FI
Microsemi Corporation Confidential and Proprietary
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The device is packaged in a small 40-pin QFN (6mm x 6mm). The Exposed Pad must be connected to a ground
plane on the printed circuit board for thermal conduction. Also, the internal analog grounds and battery grounds are
connected to the exposed pad, as well as to the GND pin. The single GND pin may not be sufficient for peak current
return. The ground plane to which the exposed pad connects is used as analog signal ground and battery ground.
EN
A Common Protection Reference (CPR) output is available. It provides the gate reference voltage for a common
shared protector or independent per line protectors for both channels. The reference voltage will be the more
negative of VBAT1 and VBAT2. When the circuit is activated it will source at least 10mA of gate trigger current.
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