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| 型號： | SI3230PPQX-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 19/108頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL W/DISCRETE INTERFACE |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | ProSLIC® |
| 主要目的： | 接口，模擬前端（AFE） |
| 已用 IC / 零件： | Si3230 |
| 已供物品： | 板，CD |
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Si3230
18
Preliminary Rev. 0.96
Not
Recommended
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2. Functional Description
The Si3230 ProSLIC is a single low-voltage CMOS
device that provides all the SLIC, DTMF detection, and
signal generation functions needed for a complete
analog telephone interface when connected to an
external codec. The ProSLIC performs all battery,
overvoltage, ringing, supervision, and test functions.
Unlike most monolithic SLICs, the Si3230 does not
require
externally
supplied
high-voltage
battery
supplies. Instead, it generates all necessary battery
voltages from a positive dc supply using its own dc-dc
converter controller. Two fully programmable tone
generators can produce DTMF tones, phase continuous
FSK (caller ID) signaling, and call progress tones.
DTMF decoding and pulse metering signal generation
are also integrated. The Si3201 linefeed interface IC
performs all high voltage functions. As an option, the
Si3201 can also be replaced with low-cost discrete
components as shown in the typical application circuit in
The 3230 is primarily meant to be used with Broadcom
devices
BCM1101,
BCM3351/52,
and
BCM6352.
Special directions for interfacing and operating the
Si3230 are needed. Please contact Silicon Laboratories
for guidance with other applications.
The linefeed provides programmable on-hook voltage,
programmable off-hook loop current, reverse battery
operation, loop or ground start operation, and on-hook
transmission ringing voltage. Loop current and voltage
are continuously monitored using an integrated A/D
converter. Balanced 5 REN ringing with or without a
programmable dc offset is integrated. The available
offset, frequency, waveshape, and cadence options are
designed to ring the widest variety of terminal devices
and to reduce external controller requirements.
2.1. Linefeed Interface
The ProSLIC’s linefeed interface offers a rich set of
features and programmable flexibility to meet the
broadest applications requirements. The dc linefeed
characteristics are software programmable; key current,
voltage, and power measurements are acquired in
realtime and provided in software registers.
2.1.1. DC Feed Characteristics
The ProSLIC has programmable constant voltage and
constant current zones as depicted in Figure 8. Open
circuit TIP-to-RING voltage (VOC) defines the constant
voltage zone and is programmable from 0 V to 94.5 V in
1.5 V steps. The loop current limit (ILIM) defines the
constant current zone and is programmable from 20 mA
to 41 mA in 3 mA steps. The ProSLIC has an inherent
dc output resistance (RO) of 160 .
Figure 8. Simplified DC Current/Voltage
Linefeed Characteristic
The TIP-to-RING voltage (VOC) is offset from ground by
a programmable voltage (VCM) to provide voltage
headroom to the positive-most terminal (TIP in forward
polarity states and RING in reverse polarity states) for
carrying
audio
signals.
summarizes
the
parameters to be initialized before entering an active
state.
2.1.2. Linefeed Architecture
The ProSLIC is a low-voltage CMOS device that uses
either an Si3201 linefeed interface IC or low-cost
external components to control the high voltages
required for subscriber line interfaces.
The ProSLIC uses both voltage and current sensing to
control TIP and RING. DC and AC line voltages on TIP
and RING are measured through sense resistors RDC
and RAC, respectively. The ProSLIC uses linefeed
transistors QP and QN to drive TIP and RING. QDN
isolates the high-voltage base of QN from the ProSLIC.
The ProSLIC measures voltage at various nodes in
Table 19. Programmable Ranges of DC
Linefeed Characteristics
Parameter
Programmable
Range
Default
Value
Register
Bits
Location*
ILIM
20 to 41 mA
20 mA
ILIM[2:0]
Direct
Register 71
VOC
0 to 94.5 V
48 V
VOC[5:0]
Direct
Register 72
VCM
0 to 94.5 V
3 V
VCM[5:0]
Direct
Register 73
*Note:
The ProSLIC uses registers that are both directly
and indirectly mapped. A “direct” register is one that
is mapped directly.
V
(T IP-RING ) (V )
V
OC
C onstant
Voltage
Zone
R
O =160
Constant Current
Zone
I
LIM
I
LOOP(m A )
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