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參數(shù)資料
| 型號： | W671570P |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 9/42頁 |
| 文件大?。?/td> | 1230K |
| 代理商： | W671570P |
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W671500 SERIES
PSLC ISLC
VBH 1 ISLCx1200
+ +
(
)
×
=
(EQ. 25)
Most applications do not specify charging current requirements during standby. When specified, the
typical charging current may be as high as 5 mA.
7.2.2. Forward Active Mode
The Forward Active mode (FA, 001) is the primary AC transmission mode of the device. On-hook
transmission, DC loop feed and voice transmission are supported during Forward Active. Loop
supervision is provided by either the Switch Hook Detector (E0 = 1) or the Ground Key Detector
(E0 = 0). The device may be operated from either high or low battery for on-hook transmission and
low battery for loop feed.
7.2.2.1. On-Hook Transmission
The primary purpose of On-hook transmission is to support caller ID and other advanced signalling
features. The transmission over load level while On-hook is 3.5VPEAK.
When operating from the high battery, the DC voltages at Tip and Ring are MTU compliant. The
typical Tip voltage is -4V. For battery voltages less than -60V, the Ring voltage is a function of the
battery voltage and is calculated as follows.
VRING
VBH 4
+
=
(EQ. 26)
Loop supervision is provided by the Switch Hook Detector at the DET output. When DET goes low,
the low battery should be selected for DC loop feed and voice transmission.
7.2.2.2. Feed Architecture
The design implements a voltage feed/current sense architecture. The device controls the voltage
across Tip and Ring though sensing of load current. Resistors are placed in series with Tip and Ring
outputs to provide the current sensing. The diagram below illustrates the concept.
+
-
+
-
V
IN
V
OUT
R
C
R
CS
R
L
R
B
R
A
K
S
FIGURE 7: VOLTAGE FEED CURRENT SENSE DIAGRAM
Publication Release Date: April 2004
- 17 -
Revision 1.0
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