Sharp FO-CC500 Service Manual page 73

2. Charger circuit
CHARGER CIRCUIT
+
TERMINAL
–
HSCHG
F1
CONNECTOR
FOR BATTERY
This system use two methods of charging to the battery.
One is quick charge, another is trikle charge.
The quick charge is that HSCHG signal level is high.
The current of quick charge is about 160mA - 92mA.
The control of trikle charge is shown as below.
1
HSCHG
0
5.8SEC
CURRENT
Ex.) The current of quick charge mode to the battery
CHARGER CIRCUIT
+
TERMINAL
–
HSCHG
F1
CONNECTOR
FOR BATTERY
3. 2.4GHz DSSS Technical Specifications
No. Item
1 FREQUENCY
2 NUMBER OF CHANNEL
3 CHANNEL SPACING
4 ACCESS METHOD
5 SPREAD METHOD
6 CHIP RATE
7 DATA TRANSFER RATE
8 RATE OF BASE BAND DATA 1200kbps
9 MODULATION METHOD
R9
R10
VCC BAT
TO REGULATOR
Fig. 15
54.2SEC
about 100mA
8mA
Fig. 16
R9
R10
VCC BAT
TO REGULATOR
Fig. 17
Specifications
2.4GHz ISM BAND
40CH
1.8MHz
FDMA-TDD
(Frequency Division Multiple
Access, Time Division Duplex)
DSSS
(Direct Sequence Spread Spectrum)
12chips/bit
100kbps
DBPSK
(Differential Binary Phase Shift Keying)
4. Channel Frequency
Using channel are shown as below.
The frequency spacing is 1.8MHz, not overlapping.
Channel Center
Channel
Number Frequency (MHz)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
5. TX Wideband Response
Fig. 18 shows a typical plot of random spread spectrum data as viewed
at the antenna. This plot can be used to check that the system per-
forms to the FCC out-of-band emission requirements.
Ref Level
40 dBm
10.9 dB Offset
30
20
10
0
-10
-20
-30
-40
-50
Test Conditions:
High Power Mode
VBATT: +3.6 V -60
Center 2439.0 MHz
Fig. 18 RF Spectrum of Merlin 2400 MHz
5 – 23
FO-CC500A
FO-K01A
Channel Channel Center
Frequency (MHz)
Number
2404.8 21
2406.6 22
2408.4 23
2410.2 24
2412.0 25
2413.8 26
2415.6 27
2417.4 28
2419.2 29
2421.0 30
2422.8 31
2424.6 32
2426.4 33
2428.2 34
2430.0 35
2431.8 36
2433.6 37
2435.4 38
2437.2 39
2439.0 40
RBW 100 kHz
RF Att
VBW 1 MHz
SWT 5 ms
Unit
500 kHz
2440.8
2442.6
2444.4
2446.2
2448.0
2449.8
2451.6
2453.4
2455.2
2457.0
2458.8
2460.6
2462.4
2464.2
2466.0
2467.8
2469.6
2471.4
2473.2
2475.0
40 dB
dBm
Span 5 MHz