KGP-2A/2B
8
1. Power Supply Circuit
The KGP-2A/2B power supply circuit uses a dedicated
regulator IC for each circuit application so that the circuits
do not interfere with each other. (Figure 1)
2. Digital Control Circuit
■
GPS module (KGP-2A only)
The location data is measured by the internal GPS mod-
ule. When the KGP-2A is turned OFF, it enters the backup
mode and the power is supplied by the internal rechargeable
lithium battery. It takes approximately 40 seconds to calcu-
late the location data when the KGP-2A is “cold” started (full
initializing).
COMPONENTS DESCRIPTION
CIRCUIT DESCRIPTION
IC3
IC10
IC13
8V
IC4
8V
3.3V
1.8V
3.3V DSP I/O
(KGP-2B CPU)
1.8V DSP Core
5V analog
(KGP-2A CPU)
GPS module
3.3V analog
SB
IC7
IC11
5V
3.3V
GPS module
VANT
IC34
3.3V
Fig. 1
Control Unit (X53-3980-XX)
Ref. No.
Use / Function
Operation / Condition
IC1
Reset IC
Monitor of SB power supply voltage
IC3,4
Regulator
8V (1A)
IC6
RS-232C driver
Level converter 5V
↔
RS-232C
IC7
Regulator
5V (500mA)
IC9
Extended I/O
Radio control, Serial/parallel conver-
sion
IC10,11 Regulator
3.3V
IC12
Shift register
LED (D26~28) control, Power
switch of GPS module
IC13
Regulator
1.8V
IC14
Reset IC
Monitor of CPU power supply voltage
IC15
EEPROM
Memory backup
IC16
Amplifi er
Input data
IC17
CPU
16 Bit
IC18
D/A converter
IC19
Level converter
5V
↔
3V
IC20,21 Level converter
5V
→
3V
IC22
CODEC IC
A/D,D/A conversion
IC23
Gate IC
IC19 direction control
IC24
Gate IC
A19 (IC17) Logic inverter
IC25
Memory IC
3.3V FLASH ROM
IC26
Ampifi er
Output data
IC28
Clock demultiplier for DSP
IC29
DSP IC
IC31
Level converter
5V
→
3V
Ref. No.
Use / Function
Operation / Condition
IC32
Amplifi er
Microphone input signal
IC34
Regulator
3.3V
Q1,2
Switching
Level converter 3V
→
5V
Q4
Switching
Power switch of GPS module
Q5,6
Switching
Output terminal open-collector
Q7,8
Switching
Output terminal open-collector
Q10~14
Switching
Level converter 3V
→
5V
Q15
Switching
Logic inverter
Q16~26
Switching
Level converter 3V
→
5V
D1
Over current
protection
0.75A
D2
Backward voltage
protection
D5
Reverse current
protection
D7~9
Surge absorption
D12
Surge absorption
D18
Reverse current
protection
D24
Surge absorption
D26
LED
DC SOURCE (Power)
D27
LED
GPS
D28
LED
DATA (TX/RX)
D30
Reverse current
protection
D31~48 Surge absorption
D50~62 Surge absorption
