msm7617 Oki Semiconductor, msm7617 Datasheet - Page 10

• Manufacturer Part Number: msm7617
• Description: 2-channel Echo Canceler
• Manufacturer: Oki Semiconductor

¡ Semiconductor
PIN DESCRIPTIONS (Continued)
Pin
31
32
38
39
40
41
42
Symbol
PWDWN
SYNCO
ECDM0
ECDM1
WDT1
SCKO
DF1
Type
O
O
O
O
I
I
ECDM1
Tone disabler flag output pin for channel 1.
This pin outputs a disable flag when the ECDM pins are used for tone disabler
mode.
Not used. Leave this pin open.
Output pin for internal SYNC signal (8 kHz).
This pin is used as the transmit/receive synchronization signal for PCM signals.
Connect it to the SYNC pin and PCM CODEC’s synchronization signal pin. Leave
this pin open if using an external SYNC.
Output pin for internal SCK signal (256 kHz).
This pin is used for the transfer clock of PCM signals. Connect it to the PCM
CODEC’s synchronization signal pin. Leave open if using an external SYNC.
Tone disabler control pin common to channel 1 and channel 2.
These pins detect answer tones generated by modems (2100 Hz), and then
disable the echo canceler.
Common pin for channel 1 and channel 2.
This pin controls the power-down mode to reduce current consumption
when the device is not being used.
During power-down mode all input pins are invalid, and output pins will enter
the following states.
Previous state: DF1, WDT1, DF2, WDT2
Reset the device after power-down mode is released.
"H": Echo canceler disabled
"L": Echo canceler enabled
"L": Power down
"H": Normal operation
Hi-Z: SOUT1, SOUT2, ROUT1, ROUT2
"L": SYNCO, SCKO
0
0
1
1
ECDM0
0
1
0
1
Tone Disabler Mode
Off
2100 Hz tone detection: On
2100 Hz and phase reversal detection: On
Inhibited
Description
MSM7617
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