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| 型号： | SI3232PPTX-EVB |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 69/128页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL W/DISCRETE INTERFACE |
| 标准包装： | 1 |
| 系列： | ProSLIC® |
| 主要目的： | 接口，模拟前端（AFE） |
| 已用 IC / 零件： | Si3232 |
| 已供物品： | 板，CD |
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Si3232
Preliminary Rev. 0.96
45
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4.12.1. Polarity Reversal
The Si3232 supports polarity reversal for message-
waiting functionality as well as various signaling modes.
The ramp rate can be programmed for a smooth
transition or an abrupt transition to accommodate
different application requirements. A wink function is
also provided for special equipment that responds to a
register bits required to program the polarity-reversal
modes.
An immediate reversal (hard reversal) of the line polarity
is achieved by setting the Linefeed register to the
opposite polarity. For example, a transition from
Forward Active mode to Reverse Active mode is
achieved by changing LF[2:0] from 001 to 101. Polarity
reversal can also be accommodated in the OHT and
ground-start modes. The POLREV bit is a read-only bit
that reflects whether the device is in polarity reversal
mode. A smooth polarity reversal is achieved by setting
the PREN bit to 1 and setting the RAMP bit to 0 or 1
depending on the desired ramp rate (see Table 27).
Polarity reversal is then accomplished by toggling the
linefeed register from forward to reverse modes as
desired.
A wink function is used to slowly ramp down the TIP-
RING voltage (VOC) to 1 followed by a return to the
original VOC value (set in the VOC RAM 0 location).
This scheme is used to light a message-waiting lamp in
certain handsets. To enable this function, no change to
the linefeed register is necessary. Instead, the user
must set the VOCZERO bit to 1 to cause the TIP-RING
voltage to collapse to 0 V at the rate programmed by the
RAMP bit. Setting the VOCZERO bit back to 0 causes
the TIP-RING voltage to return to its normal setting. A
software timer provided by the user can automate the
cadence of the wink function. Figure 23 illustrates the
wink function.
Table 27. Register and RAM Locations used for Polarity Reversal
Parameter
Programmable Range
Register/RAM Bits
Location
Linefeed
See Table 12
LF[2:0]
LINEFEED
Polarity Reversal Status
Read only
POLREV
Wink Function
(Smooth transition to Voc = 0 V)
1 = Ramp to 0 V
0 = Return to previous VOC
VOCZERO
POLREV
Smooth Polarity Reversal Enable
0 = Disabled
1=Enabled
PREN
POLREV
Smooth Polarity Reversal Ramp
Rate
0=1 V/125s
1=2 V/125s
RAMP
POLREV
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相关代理商/技术参数 |
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|---|---|
| SI3232-X-FQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING |
| SI3232-X-GQ | 制造商:SILABS 制造商全称:SILABS 功能描述:DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING |
| SI3233 | 制造商:SILABS 制造商全称:SILABS 功能描述:PROSLIC㈢ PROGRAMMABLE CMOS SLIC WITH RINGING/BATTERY VOLTAGE GENERATION |
| Si3233-C-FM | 功能描述:射频无线杂项 Single-Chan SLIC RoHS:否 制造商:Texas Instruments 工作频率:112 kHz to 205 kHz 电源电压-最大:3.6 V 电源电压-最小:3 V 电源电流:8 mA 最大功率耗散: 工作温度范围:- 40 C to + 110 C 封装 / 箱体:VQFN-48 封装:Reel |
| SI3233-C-FMR | 功能描述:电信线路管理 IC Single-CH SLIC only BJT/inductor dc-dc RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
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