Hardware Guide
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3.3 USIM Card Interface
The module provides a USIM card interface complying with the ISO 7816-3 standard and supports both Class
B and Class C USIM cards.
Table 3-5 USIM card interface signals
Pin No.
Pin Name
Pad Type
Description
Typ. (V)
Q24
SIM0_RST
O
USIM card
reset
1.8/2.85
P23
SIM0_DATA
I/O
USIM card
data
1.8/2.85
Q22
SIM0_CLK
O
USIM card clock
1.8/2.85
3.4 Audio Interface
The module provides one PCM (Pulse Code Modulation) digital audio interface.
Table 3-6 Signals on the digital audio interface
Pin No.
Pin Name
Pad Type
Description
Typ. (V)
Comments
B7
SPEECH_I2S
_LRCK_CP
I
PCM
interface
L/R Channel
1.8
The pin is output when
the
module is used as
PCM
m
aster.
C8
SPEECH_I2S
_D_IN_CP
I
PCM interface
data in
1.8
-
B9
SPEECH_I2S
_D_OUT_CP
O
PCM
interface
data out
1.8
-
C6
SPEECH_I2S
_BCK_CP
I
PCM interface
clock
1.8
The pin is output when the
module is used as PCM
master.
The module PCM interface enables communication with an external codec to support linear format.
Figure 3-4 Recommended circuit diagram of the PCM interface (The module is used as PCM
master)
Module
PCM_SYNC
PCM_DIN
CODEC
PCM_SYNC
PCM_OUT
PCM_DOUT
PCM_CLK
PCM_IN
PCM_CLK