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參數(shù)資料
| 型號： | L3234T |
| 英文描述： | Telephone Ringer |
| 中文描述： | 電話鈴聲 |
| 文件頁數(shù)： | 14/26頁 |
| 文件大小： | 457K |
| 代理商： | L3234T |
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OPERATING MODES
Stand-By
(SBY = 1 and RNG = 0)
In Stand-By mode the L3235 limits the DC Loop
current to 3 mA.
In this mode all the AC circuits are active and all
the AC characteristics are the same as in Active
Mode.
Also the two Line Current detectors (hook and
GND key) are active but due to the loop current
limited to 3 mA theywill not be activated.
This mode is useful in emergency condition when
it is very important to limits the system power dis-
sipation.
Ringing Mode
(SBY= 0 and RNG = 1)
When ringing mode is selected ”CS” pin is set to
1 inorder to activate theL3234 ringing injector.
See L3234 for detailed description.
Ring trip is detected by means of the same inter-
nal circuitry used for off-hookdetection.
An off-hook delay time lower than
1
2
F
RING
should
be selected.(see ext. componentslist).
When ring trip is detected ”CS” is automatically
set to ”0” allowing in this way a quick ringing dis-
connection.
After Ring trip detection the Card Controller must
set the L3235 in active mode to remove the inter-
nal latching of the ”CS” information.
Active mode
(SBY = 0 andCS1 = 0)
In Active mode the L3235 has the DC charac-
teristic show in Fig.13
The DC characteristicsof L3235 has two different
feedingconditions:
1)Current Limiting Region : (short loop) the DC
impedance of the SLIC is very high (>20
Kohm) therefore the system works as a cur-
rent generator. By the ext. resistor RLIM con-
nected at pin 19 it is possibleto programlimit-
ing currentvalues from 20 mA to 70 mA.
2) Voltage source region (long loop).
The DC impedance of the L3235 is almost
equal to zero therefore the system works like
a voltage generator with in series the two ex-
ternal protectionresistors Rp.
When a limiting current value higher than 40 mA
is programmed the device will automatically re-
duce to 40 mA the loop current for very short
loop.
This is done in order to limit the maximum power
dissipationin very short loop to values lower than
2W for the external transistor and lower than
0.5W for the L3235 itself.
This improve the system reliability reducing the
L3235 power dissipation and therefore the inter-
nal junctiontemperature.
Table 1.
OPERATING
MODE
INPUT PIN
LINE STATUS
OUTPUT PIN
SBY
RNG
0: ON HOOK
1: OFF HOOK
0: NO GND KEY
1: GND KEY ON
0
1
0
1
0
1
0
1
X
X
OH
GDK
PU
CS
ACTIVE
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
1
1
1
0
1
0
0
1
1
0
0
1
1
X
X
1
0
0
0
1
0
0
0
1
1
1
0
1
0
1
0
1
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
RINGING
0(*)
0(*)
0(*)
0
1
STAND-BY
(*)This status is latched and doesn’t change until RNG turn to 0
L3234 - L3235
14/26
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L3235T | Subscriber Line Interface Circuit |
| L3234 | CAP CER 1.5UF 50V 20% X7R 1812 |
| L3235N | HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS |
| L3235 | CAP CER 1.5UF 100V 10% X7R 1812 |
| L34024 | Optoelectronic |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L3235 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS |
| L3235-D2 | 功能描述:射頻無線雜項 SLIC PABX & Key Sys RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| L3235-D2/TR | 功能描述:電信集成電路 SLIC PABX & Key Sys RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| L3235N | 功能描述:電信集成電路 SLIC PABX & Key Sys RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| L3235N-TR | 制造商:STMicroelectronics 功能描述:SLIC 49DB 77MA 5V/100V 44TQFP - Tape and Reel |
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