參數(shù)資料
型號： SI3225DCX-EVB
廠商： Silicon Laboratories Inc
文件頁數(shù)： 71/112頁
文件大?。?/td> 0K
描述： DAUGHTER CARD W/DISCRETE INTRFC
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： Si3225
已供物品： 板，CD
Si3220/25 Si3200/02
Rev. 1.3
61
Not
Recommended
fo
r N
ew
D
esi
gn
s
Setting the linefeed register to the opposite polarity
immediately reverses (hard reversal) the line polarity.
For example, to transition from Forward Active mode to
Reverse Active mode changes LF[2:0] from 001 to 101.
Polarity reversal is accommodated in the OHT and
ground start modes. The POLREV bit is a read-only bit
that reflects if the device is in polarity reversal mode.
For smooth polarity reversal, set the PREN bit to 1 and
the RAMP bit to 0 or 1 depending on the desired ramp
rate
(see
Polarity
reversal
is
then
accomplished by toggling the linefeed register from
forward to reverse modes as desired.
A wink function slowly ramps down the TIP-RING
voltage (VOC) to 1 followed by a return to the original
VOC value (set in the VOC RAM location). This scheme
lights a message-waiting lamp in certain handsets. No
change to the linefeed register is necessary to enable
this function. Instead, the user sets the VOCZERO bit to
1 so that the TIP-RING voltage collapses to 0 V at the
rate programmed by the RAMP bit. Setting the
VOCZERO bit back to 0 returns the TIP-RING voltage
to its normal setting. With a software timer, the user can
automate the cadence of the wink function. Figure 32
illustrates the wink function.
Figure 32. Wink Function with Programmable Ramp Rate
Table 33. Register and RAM Locations used for Polarity Reversal
Parameter
Programmable Range
Register/RAM
Bits
Register/RAM
Mnemonic
Linefeed
LF[2:0]
LINEFEED
Polarity Reversal Status
Read only
POLREV
Wink Function
(Smooth transition to Voc=0V)
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=1V/125 s
1=2V/125 s
RAMP
POLREV
V
TIP/RING (V)
0
-10
-20
-30
-40
-50
Time (ms)
50
40
30
20
10
60
70
80
0
2 V/125 s slope
set by RAMP bit
Set VOCZERO bit to 1
Set VOCZERO bit to 0
V
cm
V
ov
V
oc
V
TIP
V
BAT
V
RING
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
Si3225-FQ 功能描述:電信線路管理 IC Dual-Channel SLIC/ codec RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
SI3225-FQR 制造商:Silicon Laboratories Inc 功能描述:
Si3225-G-FQ 功能描述:電信線路管理 IC Dual-Channel SLIC codec RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
SI3225-G-FQR 功能描述:電信線路管理 IC Dual-CH SLIC/codec Ext Ringing Support RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
Si3225-G-GQ 功能描述:電信線路管理 IC Dual-Channel SLIC codec RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
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