TK-2317
26
5-2. Memory Circuit
The Memory circuit consists of the MCU (IC820) and
EEPROM (IC810). The EEPROM has a capacity of 512k bits
and stores the channel information, the last channel data,
the scan on status, and other parameters.
■
EEPROM
Note:
The EEPROM stores tuning data (Deviation, Squelch,
etc.).
Realign the transceiver after replacing the EEPROM.
5-3. Low Battery Warning
The battery voltage is monitored by the MCU (IC820 pin
63: BATT). When the battery voltage falls below the voltage
set by the Low Battery Warning adjustment, the red LED
blinks, notifying the operator that it is time to replace the bat-
tery (when the always option (default setting) under the Bat-
tery Warning function in the FPU is selected). If the battery
voltage falls bellow 5.6V, the transceiver does not transmit
and the warning tone beeps while the PTT switch is pressed.
Low battery warning
Battery status
The red LED blinks during
transmission.
The battery voltage is low but
the transceiver is still usable.
The red LED blinks and the
warning tone beeps while the
PTT switch is pressed.
The battery voltage is lowand
the transceiver cannotbe used
to make calls.
IC812
Baseband IC
H: OFF
L: ON
MCU
XIN
X802
39
40
XOUT
XIN
Q806
C846
R857
MCU
BSHIFT
Fig. 7 Frequency shift circuit /
图 7 频率偏移电路
MCU
EEPROM
IC820
IC810
63
IC820
MCU
BATT
R824
SB
R82
9
Fig. 8 Memory circuit /
图 8 存储电路
Fig. 9 Low battery warning /
图 9 低电池电量警告
CIRCUIT DESCRIPTION /
电路说明
5-2. 存储电路
存储电路由微处理器 (IC820) 和 EEPROM(IC810) 组成。有
512k 位的容量，包含微处理器用的对讲机控制程序以及信道
和操作功能这样的数据。
■ EEPROM
注意 :
EEPROM 保存调谐数据 ( 频偏、静噪等 )。
更换 EEPROM 后，请重新校正手持对讲机。
5-3. 低电池电量警告
电池电压由微处理器 (IC820 针脚 63:BATT) 监控。发射期
间，当电池电压低于低电池电量警告调节设置的电压时，红
色 L E D 闪烁，通知操作者应该更换电池了 ( 当选择了 F P U 电
池告警功能下的选项 ( 默认 ) 时 )。如果电池电压低于 5.9V，
按下 PTT 开关时手持对讲机不发射并响起警告音。
低 电 池 电 量 警 告
电 池 状 态
发射期间红色 LED 闪烁。
电池电压低，但手持对讲机仍
能使用。
按下 PTT 开关时，红色 LED 闪
烁并响起警告音。
电池电压低，不能使用手持对
讲机进行呼叫。
