msm7570l-01 Oki Semiconductor, msm7570l-01 Datasheet - Page 24

• Manufacturer Part Number: msm7570l-01
• Description: Multi-function Adpcm Codec Msm7570l-01/02multi-function Adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
(7) CR6 (VOX function control)
B7 ... VOX function enable;
B6, B5 ... Transmit signal energy detect (Transmit VOX) threshold
B4 ... Hang-over time (Fig.2, T
B3 ... Receive VOX function setting;
B2 ... Background noise amplitude setting;
B1, B0 ... (0, 0):
(8) CR7 (Detect register, read only)
B7 ... Transmit VOX function result;
B6, B5 ... Transmit silence level (indicator); (at 1000 Hz)
B4 ... Not used
B3 ... Not used
B2 ... Not used
B1 ... Not used
B0 ... Not used
CR6
Initial Value
CR7
Initial Value
Automatic : Set the noise at the voice signal amplitude when B3 (or VOXI) changes from
When using this data for control, set pin VOXI at “0” level.
“1” to digital “0”.
(0, 1): –55 dBm0
(1, 0): –45 dBm0
(1, 1): –35 dBm0
(0, 0): –30 dBm0
(0, 1): –35 dBm0
(1, 0): –40 dBm0
(1, 1): –45 dBm0
(0, 0) : Below –60 dBm0
(0, 1) : –50 to –60 dBm0
(1, 0) : –40 to –50 dBm0
(1, 1) : Above –40 dBm0
No noise
ON/OFF
VOX
VOX
OUT
B7
B7
0
0
TX NOISE
LVL1
LVL1
VXOFF)
B6
ON
B6
0
0
0/Disable, 1/Enable
;
TX NOISE
LVL0
LVL0
B5
ON
B5
0
0
0/160 ms, 1/320 ms
0/Background noise transmit, 1/Voice signal detect
0/Silence, 1/Voice
Note: These outputs are valid only when the VOX
function is enabled by CR6-B7.
TIME
0/Automatic, 1/Programmable by B1 and B0
OFF
B4
B4
—
0
*
VOX IN
B3
B3
—
0
*
LEVEL SEL
RX NOISE
B2
B2
—
0
*
MSM7570L-01/02
RX NOISE
LVL1
B1
B1
—
0
*
*
For IC test
RX NOISE
LVL0
24/26
B0
B0
—
0
*