Le9541
Ringing Subscriber Line Interface Circuit
VE950 Series
Preliminary Data Sheet
Features
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•
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Single Channel High Voltage Ringing SLIC
Functionally Equivalent of Le9540 One Channel
High Voltage High Bandwidth Design Supports 7-
kHz Wide Band Applications
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•
Up to –145 V ringing battery Le9541D
Up to –100 V ringing battery Le9541C
Document Code PD-000245729
Version 9
May 2019
Ordering Information
Le9541CUQC
Le9541DUQC
Le9541CUQCT
Le9541DUQCT
40-pin QFN
40-pin QFN
40-pin QFN
40-pin QFN
Tray
Tray
Tape and Reel
Tape and Reel
Operation Control and Status Report through
Serial Interface with Reset
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-
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 package.The green package is Halogen
free and meets RoHS Directive 2002/95/EC of the European
Council to minimize the environmental impact of electrical
equipment.
Description
•
Eight Operating States
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FI
D
The Le9541 Ringing SLIC device is a single-channel
device and equivalent of channel 1 of Le9540 in the
same 40-pin QFN package. It is 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 are communicated through a serial
interface with reset. The SLIC supports wide-band
applications.
EN
GAIN = 13.67
V I TR
AAC
TX I
V TX
AX
( I TR / 4 3 2 )
I TR
PT
PR
TES T
S W I TCH
TLD
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Ringing Inputs for Optimized Interface to BRCM
SoC Devices
-
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RTF LT
V BA T
LO O P
S TA TU S
RECTI F I ER
BA TTERY
S U P P LY
G ain = 8
AT
CU RREN T
S EN S E
AR
+
–
RI N G
–
+
DC
F EED
AC
G ain = 1 5 0
D CF
RES ET
S ERI A L
I N TERF A CE
EN
CLK
DIN
DOUT
VDD
Accepts driving signals from per channel voice
outputs as well as from PWM outputs
•
•
•
•
•
DC Current Limited in Active/Scan/Tip Open
States
BI A S
I REF
V CC
V REF
C
Loop Start, Ring Trip, and Ring-Ground
Detections with Two Thresholds
Thermal Shutdown Protection with Hysteresis
Test Load Switch Supports Integrated Test
Algorithms
Available in 40-pin QFN package that is “pin-to-
pin” compatible with (channel 1 of) Le9540.
RCV P
RN
V REF
RI N G P
Applications
•
Optimized to work with BCM3383/85 Broadcom
SoCs for short loop residential gateways
1
Microsemi Corporation Confidential and Propritary
Figure 1 - Block Diagram
Le9541
Table of Contents
Preliminary Data Sheet
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operating States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Communication Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
In-rush Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Loop Closure and Ring Trip Detection Thresholds with Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Design Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Application Circuit Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
40-pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 1 to Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 2 to Version 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 3 to Version 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 4 to Version 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 5 to Version 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 6 to Version 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 7 to Version 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Version 8 to Version 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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Microsemi Corporation Confidential and Proprietary
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Le9541
List of Figures
Preliminary Data Sheet
C
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Microsemi Corporation Confidential and Proprietary
FI
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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 - Le9541 Basic Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 6 - Metallic PSRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 7 - Longitudinal PSRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 8 - Longitudinal Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 9 - AC Gains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 10 - Detection Thresholds with Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 11 - Reference Schematic Interfacing Broadcom Codec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Le9541
Product Description
Preliminary Data Sheet
The Le9541 device is a single-channel design from Le9540. It is 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 Le9541 device is powered by a Vcc for analog circuits, a VDD for the serial logic circuits and a VBAT for DC
feed and power ringing. The maximum of VBAT is rated at –100 V for Le9541C and –145 V for Le9541D. 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 Le9541D 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 Le9541 device uses a voltage-feed-current-sense architecture. The 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.
4
Microsemi Corporation Confidential and Proprietary
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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
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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.
D
EN
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Le9541
Ringing
Preliminary 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. 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 indications.
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. The RESET pin has
an internal pull down.
Package
Protection
Thermal
C
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.
O
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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.
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Microsemi Corporation Confidential and Proprietary
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A battery referenced protection device should reference to VBAT. Connect the gate of the battery referenced
protection device to VBAT or to PRT_REF. PRT_REF is available on pin 36 where CPR is on Le9540 to enable
drop-in use of the Le9541 in a Le9540 design where CPR is used. PRT_REF should not be used to replace VBAT
pin as battery supply.
EN
Le9541 is available in a 40-pin QFN package (6mm x 6mm). It is the same package used for Le9540. The pin
assignments of Le9541 are exactly the same as Le9540 on channel 1 making it possible to share the same
package footprint on a PCB with Le9540.
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PCB Design
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