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Cordless Handset consists of the following ICs as shown in
(CORDLESS HANDSET)
).
-
DECT BBIC (Base Band IC): IC1
-
All data signals (forming/analyzing ACK or CMD signal)
-
All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD)
-
RF Module: IC3
-
PLL Oscillator
-
Detector
-
Compress/Expander
-
Amplifier for transmission and reception
-
AMP: IC2
-
Single OP_AMP for SP
-
MIDI (Musical Instrument Digital Interface): IC4
-
16-Tone 32-Poly PCM Sound Generator
-
Port (LED direct driver with PWM)
-
EEPROM: IC10
-
Temporary operating parameters (for RF, etc.)
Refer to
EEPROM LAYOUT (CORDLESS HANDSET)
).
23.2. Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Cordless Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6V: J1)
The Reset signal generates IC1 (78) and 1.8V.
(
L1, D1, Q2 (1.8V)
119
BLOCK DIAGRAM
(
Q3 (2.7V)
Q1 (4.0V)
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