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| 型号： | W671561Y |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, QCC32 |
| 封装： | 7 X 7 MM, 0.65 MM PITCH, QFN-32 |
| 文件页数： | 41/42页 |
| 文件大小： | 1230K |
| 代理商： | W671561Y |
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W671500 SERIES
7. FUNCTIONAL DESCRIPTION
7.1 DESIGN EQUATIONS
7.1.1. Switch Hook Detect
The switch hook detect threshold is set by a single external resistor, RSH calculated as follows.
RSH
600 ISH
=
(EQ. 1)
The term ISH is the desired DC loop current threshold. The loop current threshold programming range
is from 5mA to 15mA.
7.1.2. Ground Key Detect
The Ground Key Detector senses a DC current imbalance between the Tip and Ring terminals when
the ring terminal is connected to ground. The Ground Key Detect threshold is not externally
programmable and is internally fixed to 12 mA regardless of the switch hook threshold.
7.1.3. Ring Trip Detect
The Ring Trip Detect threshold is set by a single external resistor, RRT. IRT should be set between the
peak ringing current and the peak off hook current while still ringing.
RRT
1800 IRT
=
(EQ. 2)
In addition, the Ring Trip current must be set below the transient current limit, including tolerances.
The capacitor CRT, in parallel with RRT, will set the Ring Trip response time.
7.1.4. Loop Current Limit
The loop current limit of the device is programmed by the external resistor RIL. The value of RIL can be
calculated as follows.
RIL
1760
ILIM
-------------
=
(EQ. 3)
The term ILIM is the desired loop current limit, programmable between 15mA and 45mA.
7.1.5. Transient Current Limit
The drive current capability of the output tip and ring amplifiers is determined by an output current limit
circuit and is externally programmable at pin TL. This output current limit is separate from the DC
loop current limit function. The current limit circuit works in both the source and sink direction, with an
internally fixed offset to prevent the current limit functions from turning on simultaneously. The current
limit function is provided by sensing line current and reducing the voltage drive to the load when the
externally set threshold is exceeded, hence forcing a constant source or sink current.
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