Preliminary
HT9015
¨
Battery saving control
0 ¼¼¼¼Operation
1 ¼¼¼¼Battery saving
Bit
Control Block
TX-RF
TX-AF
TX-PLL
MIC AMP, Compressor, Splatter
TX-RF= 1 and
RX-RF= 1
LOCAL OSC= OFF
RX-VCO, RX-PLL, 1st MIX, 2nd MIX IF AMP, NOISE DET,
DATA COMP, RSSI
RX-RF
RX-AF
Pre AMP, Expander, Receiver AMP
¨
MUTE control
0 ¼¼¼¼normal
1 ¼¼¼¼MUTE
MUTE for Compressor output.
These bits prevent the compander block going into a battery saving mode. Current consumption
therefore does not decrease.
¨
Charge pump current control
PLL loop performance such as lock-up time can be changed by these control bits.
Bit
Control Output
0
1
TX CP
RX CP
TX-PLL Charge Pump Output Current
RX-PLL Charge Pump Output Current
200mA
200mA
400mA
400mA
¨
BATTERY ALARM detection setting
There are has four threshold levels for low battery detection.
These threshold levels are shown on the table below.
(1)BC
BA1
BA2
VBAT-L
3.00V
3.25V
3.30V
3.45V
0
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
(2)Battery Saving
(1) BC bit in REF divider
(2) Only for BATTERY ALARM block
12
April 10, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
