Siemens MC45 Manual page 64

MC45 Hardware Interface Description
P R E L I M I N A R Y
Function Signal name
RS-232 (0) /RXD0
interface
/TXD0
/CTS0
/RTS0
/DTR0
/DCD0
/DSR0
/RING0
RS-232 (1) /RXD1
interface
/TXD1
/CTS1
/RTS1
Digital audio RFSDAI
interface
RXDDAI
SCLK
TFSDAI
TXDDAI
Analog audio EPP2
interfaces
EPN2
EPP1
EPN1
MICP1
MICN1
MICP2
MICN2
AGND
MC45_HD_01_V00.02a
IO Signal form and level
O
V max = 0.2V at I = 1mA
OL
V min = 2.35V at I = -1mA
I
OH
V max = 2.73V
OH
O
I
V max = 0.5V
IL
V min = 1.95V, V max=3.3V
I IH IH
/DTR0, RTS0: Imax = -90µA at V
O
/TXD0: Imax = -260µA at V
O
O
O
V max = 0.2V at I = 1mA
OL
V min = 2.35V at I = -1mA
OH
V max = 2.73V
OH
I
V max = 0.5V
IL
V min = 1.95V, V max=3.3V
O
IH IH
I max = -90µA at V
I IN
I
I V max = 0.2V at I = 1mA
OL
V min = 2.35V at I = -1mA
I
OH
V max = 2.73V
OH
I
O
V max = 0.5V
IL
V min = 1.95V, V max=3.3V
O
IH IH
I max = 330µA at V
I IN
O
V max = 3.7Vpp
O
See also Table 32.
O
O
V max = 3.7Vpp
O
See also Table 32.
O
I
R ≈ 50k W differential
I
V max = 1.03Vpp
I
I
See also Table 33.
I
= 2k W differential
R
I
V max = 1.03Vpp
I
I
See also Table 33.
Page 64 of 90
Comments
First serial interface for AT
commands or data stream.
Please note that the /TXD0
pin draws, for 350ms, an
additional current of max.
60µA
activated.
= 0V
IN
characteristics in Figure 6
= 0V
IN
If unused keep pins open.
Second serial interface for
AT commands.
Please note that the /TXD1
pin draws, for 350ms, an
additional current of max.
60µA
activated.
= 0V
characteristics in Figure 6
If unused keep pins open.
If unused keep pins open.
= 3.3V
The audio output is
balanced and can directly
operate an earpiece.
If unused keep pins open.
Balanced audio output.
Can be used to directly
operate an earpiece.
If unused keep pins open.
Balanced microphone
input. To be decoupled
with 2 capacitors (C
100nF), if connected to a
microphone or another
device.
If unused keep pins open.
Balanced microphone
input. Can be used to
directly feed an active
microphone.
If used for another signal
source, e.g. op amp, to be
decoupled with capacitors.
If unused keep pins open.
Separate ground
connection for external
audio circuits.
when MC45 is
See timing
when MC45 is
See timing
=
K
12.08.2002