µ
PD9930
Figure 2-5 Power Down Control
Register address
0
0
0
AMPCR
MICPDB XAUXPDB REC1PDB RAUXPDB RINGPDB
TXGCR
1
1
0
REC2PDB
TXAG
HEX
Note
Register address
0
0
0
Power up command
0
1
1
1
1
0
—
—
M
78H
L
1EH
Power down command
0
1
1
1
0
0
—
—
HEX
Note
M
70H
L
0EH
Note
M: HEX value with MSB first L: HEX value with LSB first
PLL
Microphone input
–
+
Stand-by
Stand-by
"1" = Power ON
MICPDB
Pre-filter
+ mixer
A/D
to XACOMI
Accessory input
–
+
to V
ref
When all input amplifiers are
in the power down state,
these also enter power
down state.
"1" = Power ON
XAUXPDB
Digital signal
processor
Accessory output
–
+
"1" = Power ON
RAUXPDB
Receiver 1
–
+
"1" = Power ON
REC1PDB
Receiver 2
–
+
to V
ref
Stand-by
D/A
Stand-by
When both accessory output
and receiver 1 amplifiers are
in the power down state, these
also enter power down state.
Stand-by
"1" = Power ON
–
+
to V
ref
REC2PDB
Ringer output
Stand-by
"1" = Ringer output
RINGPDB
Caution MICPDB and XAUXPDB cannot enter the power up state at the same time (MICPDB = XAUXPDB =
"1").
13
NEC [ NEC ]
