¡ Semiconductor
MSM6889
Pin Number
RS
GS
33
23
34
25
35
26
36
27
37
28
38
30
39
31
40
—
41
32
42
34
Name
CP
PB1
PB2
PB3
PB4
SP
PON
NC
VD2
VD
I/O
Description
Call progress tone (CPT) detect output.
O When a CPT is detected, the waveform selected by ICT1 is output.
(See Fig. 9. )
O
Receive PB tone code outputs.
O
The output impedance of these pins becomes high except when the
O
device operates as PB tone receiver. (See Fig. 7 and Fig. 8. )
O
PB tone receive data present.
O Digital "1" represents that this pin is receiving the PB tone.
(See Fig. 8. )
Power down mode select. Digital "1" on this pin puts the whole
I
circuit of the device into the power down state.
— No connection.
Power supply for digital interface output.
The supply voltage from +2.5 V to VD is possible for VD2. For
example, when the device interfaces to the MCU working on +3 V
supply, the +3 V supply has to be applied to the VD2 pin.
—
Note that this function is effective to all of digital output pins
except X1, X2, and CLK.
There is no restriction regarding the power supplies (VD and VD2)
applying procedure.
+5 V power supply (digital circuit).
When power is turned on or the power down mode is released, the
—
device must be put into the PB tone transmit mode or PB tone
detect mode.
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