Panasonic KX-TDA0174 Service Manual page 28

16port single line telephone extension card
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switching power supply of IC7, Q12 and L7.As protective circuits, IP4 that protects from +3.3V
short circuit, IP5 that protects from +5V short circuit, and an overvoltage protection that breaks
IP1 by turning on FET in Q14 when a rise in voltage of +3.3V/+5V is detected.
8.16. SOFTWARE INTERFACE SPECIFICATIONS
- SLC16 ADDRESS MAP
9. IC DATA
9.1. IC14(ASIC)
28

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