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(8) Charging Detection, ID Data Detection
If the portable unit is put on the base unit to recharge it, the DC voltage is applied to the charge terminal on the por-
table unit. At this time, the output of the diode bridge becomes High, and the charging detection signal is output when
Q6 is changed from High to Low. Simultaneously, the differentiated signal is input to Q7 via C43 and Q7 outputs a low
pulse to the CPU. Each output of Q6 and Q7 is the charging detection signal which the CPU uses when the power
switch is on and off.
Q2 receives the ID data that the base unit sends during charging and transmits it to the CPU.
Battery recharging is carried out by the power supply from the diode bridge via R71 and R72.
ID
DATA
Base unit
(9) CPU Power Supply, Low Battery
The power is supplied to the CPU from the battery via D5.
The CPU detects that the battery is low by comparing the constant voltage of pin
In the standby mode, X4 of the subsidiary clock oscillates at 32.76 kHz.
In the operation mode, X3 of the main clock oscillates at 4 MHz.
Circuit Diagram
C
C
R71
+
+
–
–
Diode Bridge
CONNECT
Circuit Diagram
D5
+
C47
-
RXB
3 V
R155
R211
R210
R180
R60
Q2
R59
R61
R62
R72
R71
C43
BATT
R65
C45
Portable unit
CPU
Vcc
97
AVcc
1
IC6
Batt Low
5
| 183 |
KX-F910BX
CPU
pin
44
CPU
R63
pin
25
CHARGE
Q6
C44
R64
R66
CPU
pin
26
Q7
R67
with the battery voltage of pin
5
8
Main
~
3
CLK
9
11
Sub
4
~
CLK
12
.
1
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