DP580 Service Manual
and the TX VCO for modulation.
4.6.Other Circuits
If required, such functions as Bluetooth, GPS and Man Down can be provided by adding corresponding
circuits.
4.7.Power Supply
The radio is powered by a 7.4V lithium battery. The RF amplifier and the audio amplifier are powered by the
B+ connected to a fuse. The voltage SB through a mechanical switch is converted by the DC-DC chip
MP2359 into 3.6V to power up the master chip LT1901 and the PMU in the Bluetooth chip. The PMU of the
LT1901 outputs 3M, AVDD_2V8, USB3.3V, D1V8 and D1V2A to power up other parts.
The voltage SB passes the LDO chip IC3 to output 5.5V to power up the phase-locked loop, and passes the
LDO chip IC24 to output 5V, which goes respectively through two switches consisting of triodes to output
5T to power up the transmitting circuit and to output 5R to power up the receiving circuit.
4.8.Port Definition for Master Chip LT1901
Pin NO.
Port NO.
Net Label
Description
A11
GPIO_D46
5SC
Power switch of phase-locked loop (on
at high level)
B13
GPIO_D47
5RC
Receiving power switch (on at high
level)
E13
GPIO_D48
5TC
Transmitting power switch (on at high
10
Summary of Contents for DP580
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Page 125: ...DP580 Service Manual Figure 5 Bottom Layer Layout Drawing of Main Board DP580 01 122 ...
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Page 129: ...DP580 Service Manual Figure 9 Bottom Layer Layout Drawing of Main Board DP580 05 126 ...