Samsung OFFICESERV 7100, Service Manual

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CHAPTER 12 .
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2-24
© SAMSUNG Electronics Co., Ltd.
2.5.6 4SLM Module
The 4SLM module is mounted on the UNI board and provides 4-port SLT interface.
The module embeds Sinewave/Square wave internal Ringer and can change Ring
Frequency/Power and Feeding Current/Voltage in software, not in hardware.
The most functions are performed by Le88241, which is the SLIC/SLAC integration IC of
Legerity Inc., and are controlled in software via the SPI interface.
2.5.6.1 Block Diagram
Figure 2.13 Block diagram of the 4SLM Module
2.5.6.2 Major Features
Module Interface Part
The UNI module interface of the 4SLM board is roughly divided into Power, PCM and SPI.
y
Power: +3.3 V, +5 V and -54 V are supplied in the UNI board.
y
3.3 V: Supply the power for Le88241 Operation and operates LCX125, a Highway
buffer.
y
+5 V: Input power of the switching regulator in Le88241
y
-54 V: Is converted into +12 V power via LT1170 Switching Regulator. The +12 V
power is used as the input power of the switching regulator in Le88241.
y
PCM: Connects to the PCM highway provided from the UNI board.
Dual ABS
(Le88241)
VDD
3.3 V
HWR/HWX
CLX
FSX
SPI-DI
SPI-DO
SPI_SCLK
CS1
RST1
Switching
Regulator
Circuit
5 V
Tip1
Ring1
Tip2
Ring2
Dual ABS
(Le88241)
VDD
3.3 V
HWR/HWX
CLX
FSX
SPI-DI
SPI-DO
SPI_SCLK
CS2
RST2
Switching
Regulator
Circuit
5 V
Tip3
Ring3
Tip4
Ring5