- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16215 > SI3225DCX-EVB (Silicon Laboratories Inc)DAUGHTER CARD W/DISCRETE INTRFC PDF資料下載
參數(shù)資料
| 型號： | SI3225DCX-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 54/112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 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁當(dāng)前第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁
Si3220/25 Si3200/02
46
Rev. 1.3
Not
Recommended
fo
r N
ew
D
esi
gn
s
3.11. Ground Key Detection
Ground key detection detects an alerting signal from the
terminal equipment during the tip open or ring open
linefeed states. The functional blocks required to
implement a ground key detector are shown in
Figure 22 on page 48, and the register set for detecting
a ground key event is provided in Table 28 on page 49.
The primary input to the system is the longitudinal
current sense value provided by the voltage/current/
power monitoring circuitry and reported in the ILONG
RAM address. The ILONG value is produced in the ISP
provided the LFS bits in the linefeed register indicate
the device is in the tip open or ring open state.
The longitudinal current (ILONG) is computed as shown
in the following equation. Refer to Figure 18 on page 38
for the transistor references used in the equation (Q1,
Q2,
Q5,
and
Q6—note
that
the
Si3200/2
has
corresponding MOS transistors). The same ILONG
equation applies to the discrete bipolar linefeed as well
as the Si3200/2 linefeed device.
The output of the ISP (ILONG) is the input to a
programmable, digital low-pass filter, which removes
unwanted ac signal components before threshold
detection.
The low-pass filter coefficient is calculated using the
following equation and is entered into the LONGLPF
RAM location:
Where f = the desired cutoff frequency of the filter.
The programmable range of the filter is from 0h (blocks
all signals) to 4000h (unfiltered). A typical value of 10
(0A10h) is sufficient to filter out any unwanted ac
artifacts while allowing the dc information to pass
through the filter.
The output of the low-pass filter is compared to the
programmable threshold, LONGHITH. Hysteresis is
enabled
by
programming
a
second
threshold,
LONGLOTH, to detect when the ground key is released.
The threshold comparator output feeds a programmable
debounce filter.
Table 25. Register and RAM Locations Used for Loop Closure Detection
Parameter
Register/RAM
Mnemonic
Register/RAM Bits
Programmable
Range
LSB Size
Effective
Resolution
Loop Closure Interrupt
Pending
IRQVEC2
LOOPS
Yes/No
N/A
Loop Closure Interrupt Enable
IRQEN2
LOOPE
Yes/No
N/A
Linefeed Shadow
LINEFEED
LFS[2:0]
Monitor only
N/A
Loop Closure Detect Status
LCRRTP
LCR
Monitor only
N/A
Loop Closure Detect Debounce
Interval
LCRDBI
LCRDBI[15:0]
0 to 40.96 s
1.25 ms
Loop Current Sense
ILOOP
ILOOP[15:0]
50.54 to
101.09 mA
3.097 A
500 A1
Loop Closure Threshold
(on-hook to off-hook)
LCROFFHK
LCROFFHK[15:0]
0 to 101.09 mA2
3.097 A
396.4 A
Loop Closure Threshold
(off-hook to on-hook)
LCRONHK
LCRONHK[15:0]
0 to 101.09 mA2
3.097 A
396.4 A
Loop Closure Filter Coefficient
LCRLPF
LCRLPF[15:3]
0 to 4000h
N/A
Loop Closure Mask Interval
LCRMASK
LCRMASK[15:0]
0 to 40.96s
1.25 ms
Notes:
1. The effective ILOOP resolution is approximately 500 A.
2. The usable range for LCRONHK and LCROFFHK is limited to 61 mA. Entering a value > 61 mA will disable threshold
detection.
I
LONG
I
Q1
I
Q6
–
I
Q5
–
I
Q2
+
2
----------------------------------------------------
=
LONGLPF
2
f 4096
800
---------------------------------
2
3
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SK102M050ST | CAP ALUM 1000UF 50V 20% RADIAL |
| M3TTK-3036J | IDC CABLE - MSD30K/MC34G/MSD30K |
| SI3225DC0-EVB | DAUGHTER CARD W/SI3200 INTERFACE |
| SEK220M400ST | CAP ALUM 22UF 400V 20% RADIAL |
| CP2201EK | KIT EVAL FOR CP2201 ETH CTRLR |
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。