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| 型号： | W671571P |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 18/42页 |
| 文件大小： | 1230K |
| 代理商： | W671571P |
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W671500 SERIES
7.2.8.2. Thermal Shutdown
In the event the safe die temperature is exceeded, the ALM output will go LOW and DET will go
HIGH and the part will automatically shut down. When the device cools, ALM will go HIGH and
DET
will reflect the loop status. If the thermal fault persists, ALM will go LOW again and the part
will shut down. Programming Power Denial will permanently shutdown the device and stop the self-
cooling cycling.
7.3. BATTERY SWITCHING
The integrated battery switch selects between the high battery and low battery. The battery switch is
controlled with the logic input BSEL. When BSEL is a logic HIGH, the high battery is selected and
when a logic LOW, the low battery is selected. All operating modes of the device can operate from
high or low battery except Forward Loop Back.
7.3.1. Functionality
The logic control is independent of the operating mode decode. Independent logic control provides
maximum flexibility and will support all application configurations.
When changing device operating states, battery switching should occur simultaneously with or prior to
changing the operating mode. In most cases, this will minimize overall power dissipation and prevent
glitches on the DET output.
The only external component required to support the battery switch is a diode in series with the VBH
supply lead. In the event that high battery is removed, the diode allows the device to transition to low
battery operation.
7.3.2. Low Battery Operation
All off-hook operating conditions should use the low battery. The prime benefit will be reduced power
dissipation. The typical low battery for the device is -24V. However this may be increased to support
longer loop lengths or high loop current requirements. Standby conditions may also operate from the
low battery if MTU compliance is not required, further reducing standby power dissipation.
7.3.3. High Battery Operation
Other than ringing, the high battery should be used for standby conditions which must provide MTU
compliance. During standby operation the power consumption is typically 85mW with -100V battery. If
ringing requirements do not require full 100V operation, then a lower battery will result in lower
standby power.
7.3.4. High Voltage Decoupling
The 100V rating of the device will require a capacitor of higher voltage rating for decoupling.
Suggested decoupling values for all device pins are 0.1F. Standard surface mount ceramic
Publication Release Date: April 2004
- 25 -
Revision 1.0
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