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KX-TDA100DUP
hold 2 is input from CN300 and is made A/D conversion in IC302 via AGC (Auto Gain Control) circuit, which consists of IC306,
Q304, Q306 and other CR, and then is connected to the call line HW. The external music on hold 2 and IC308 is exclusively
connected to IC302 input (by software control).
The various tones & DTMF tone and the voice data generated in IC102 (ASIC) are made D/A conversion in IC301 and IC302.
They are output via CN300 respectively.
Q304, Q306 and other CR, and then is connected to the call line HW. The external music on hold 2 and IC308 is exclusively
connected to IC302 input (by software control).
The various tones & DTMF tone and the voice data generated in IC102 (ASIC) are made D/A conversion in IC301 and IC302.
They are output via CN300 respectively.
• Power Supply block
Configuration: IC300 (DC/DC converter), IC304 (1.8V regulator), IC303 (1.9V regulator), IC305 (OP Amp), Q300, Q301 (tran-
sistor), L301, C308, D302~D304, BAT300, F300 (FUSE) and so on.
Function:
+15V input is made step-down to +3.3V by DC/DC converter circuit that consists of IC300, L301, Q301 and C308, and is sup-
plied to each IC power. Also, it monitors +3.3V output voltage and turns ON Q300 to block +15V input when over voltage is
supplied.
+3.3V generated in DC/DC converter is converted to 1.8V IC304 and supplied to IC5 core power, and also is converted to 1.9V
in IC303 via the back-flow prevention diode D302 and supplied to IC5 clock block power.
BAT300, which is a lithium battery for memory backup, is connected to the power supply of IC202, IC203 (SRAM) via D303,
D304.
IC305 compares BAT300 output voltage to the reference voltage (about 2.8V) and drives LED (BATALM) that indicates drop-
ping of backup voltage.
sistor), L301, C308, D302~D304, BAT300, F300 (FUSE) and so on.
Function:
+15V input is made step-down to +3.3V by DC/DC converter circuit that consists of IC300, L301, Q301 and C308, and is sup-
plied to each IC power. Also, it monitors +3.3V output voltage and turns ON Q300 to block +15V input when over voltage is
supplied.
+3.3V generated in DC/DC converter is converted to 1.8V IC304 and supplied to IC5 core power, and also is converted to 1.9V
in IC303 via the back-flow prevention diode D302 and supplied to IC5 clock block power.
BAT300, which is a lithium battery for memory backup, is connected to the power supply of IC202, IC203 (SRAM) via D303,
D304.
IC305 compares BAT300 output voltage to the reference voltage (about 2.8V) and drives LED (BATALM) that indicates drop-
ping of backup voltage.
5.3.
Back Board Circuit Operation
The back board (BB) connects signals between all cards in main unit. It also supplies power from the power supply unit (PSU) to
the cards.
CONNECTORS EXPLANATION
(1) Power Supply Unit Connector: CN100
(2) Free Slot Connectors: CN101-CN107
(3) DMPR Card Connector: CN112
(4) LED Connector: CN114
CN114 is connected to LED Board on the product.
the cards.
CONNECTORS EXPLANATION
(1) Power Supply Unit Connector: CN100
(2) Free Slot Connectors: CN101-CN107
(3) DMPR Card Connector: CN112
(4) LED Connector: CN114
CN114 is connected to LED Board on the product.
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