¡ Semiconductor
MSM7532
PIN AND FUNCTIONAL DESCRIPTIONS
TVE
Transmit voice signal output control pin.
Refer to the TAO pin description.
RVE
Receive voice signal output control pin.
Refer to the RVO pin description.
PDN
Power down control pin.
The four-step power down modes are controlled by the PDN, ME, RVE, and TVE pins.
PDN RVE TVE ME
Processing Section
Transmit Modem Receive Modem
Oscillation Circuit
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
1
1
1
0
0
0
1
0
1
0
X
0
X
X
X
1
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
ON
ON
ON
OFF
ON
ON
ON
ON
Voice signal
Crystal
Other than above
X: Don't care
In Mode 5, all the circuits are ON.
The MODEM demodulation circuit and FD pin are reset to zero by setting to Mode 1 or Mode 2 (PDN
= “1”, RVE = “0”).
After turning the power ON, set the LSI into one of these modes, then reset it before using. To hold
the voice signal processing section ON during transmission of MSK signals, set the ME and TVE pins
to "1". In this case, the input from TVI is not output to TAO. Refer to the TAO pin description.
FDE
Pin used to control the function of frame synchronous signal detection circuit.
If digital "0" is entered in this pin, the FD pin remains reset at "0" level. The RT and RD pins are always
active.
If digital "1" is entered in this pin, the frame synchronous signal detection circuit becomes active.
And the RT and RD pins are fixed at "1" level until the FD pin goes to "1" level by detecting the frame
synchronous signals.
Refer to Figure 3 "Receive Signal Timing".
BYP
Compander path selection pin.
BYP
0
1
Transmit side
Compressor is connected to the path.
Compressor is bypassed to the path.
Receive side
Expander is connected to the path.
Expander is bypassed to the path.
Note
SW1
When the expander is used, the maximum gain of expander is limited to approximately +12 dB. This
tendency will appear as the input signal level is increased when V
DD
is larger (e. g., 5 V) and V
CPDL
is smaller (e,g., 0.1 V); the input/output characteristics then change automatically from expander
characteristics to linear characteristics with constant gain.
4/21
OKI [ OKI ELECTRONIC COMPONETS ]
