Specifications

LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary System description
Page 37 of 75
LEON-G100/G200
37
43
44
MIC_BIAS1
MIC_GND1
HS_P
Audio Device
Single-ended Analog Output
Reference
Single-ended Analog Input
10 µF
GND
Reference
10 µF
LEON-G100/G200
37
43
44
MIC_BIAS1
MIC_GND1
HS_P
Audio Device
Positive Analog Input
10 µF
GND
Reference
Negative Analog Input
Single-ended
to
Differential
Positive Analog Output
10 µF
Reference
Negative Analog Output
Differential
to
Single-ended
LEON-G100/G200
37
43
44
MIC_BIAS1
MIC_GND1
HS_P
Audio Device
Single-ended Analog Output
Reference
Single-ended Analog Input
10 µF
GND
Reference
10 µF
LEON-G100/G200
37
43
44
MIC_BIAS1
MIC_GND1
HS_P
Audio Device
Positive Analog Input
10 µF
GND
Reference
Negative Analog Input
Single-ended
to
Differential
Positive Analog Output
10 µF
Reference
Negative Analog Output
Differential
to
Single-ended
Figure 23: Application circuits to connect the LEON module to external audio devices with appropriate single-ended or
differential analog audio inputs/outputs
1.9.2 Digital Audio interface (LEON-G200 only)
LEON-G200 supports a bidirectional 4-wire I2S digital audio interface. The module acts as master only. The I2S
pins are listed in Table 6:
Name
Description
Remarks
I2S_WA
I2S word alignment
Module output (master)
I2S_TXD
I2S transmit data
Module output
I2S_CLK
I2S clock
Module output (master)
I2S_RXD
I2S receive data
Module input
Table 6: I2S interface pins
The I2S interface can be can be used in two modes:
PCM mode: I2Sx
Normal I2S mode: I2Sy
Beyond the supported transmission modality, the main difference between the PCM mode and the normal I2S
mode is represented by the logical connection to the digital audio processing system integrated in the chipset
firmware (see Figure 24):
In PCM mode provides complete audio processing functionality
Normal I2S mode: digital filters, digital gains, side tone, some audio resources as tone generator, info tones
(e.g. free tone, connection tone, low battery alarm), and ringer are not available
The I2S interface is activated and configured using AT commands, see the u-blox AT commands manual [2].