Quectel LTE OPEN EVB User Manual

LTE Module Series
LTE OPEN EVB User Guide
LTE_OPEN_EVB_User_Guide 26 / 62
LTE OPEN EVB provides a Micro-USB interface J0601 for connection with a host device. The USB data
lines USB_DP and USB_DM are connected directly to the LTE-QuecOpen modules. The USB_VBUS line
can be used for USB connection detection and EVB power supply.
4.5. Audio Interfaces
LTE OPEN EVB provides one digital audio codec board interface (PCM) J0804 and three analog audio
interfaces J0801, J0802 and J0805.
4.5.1. Digital Audio Codec Board Interface (J0804)
LTE OPEN EVB supports two different kinds of external digital audio codecs named ALC5616 and
TLV320AIC3104. The codec circuit is assembled on an independent small board which can be
interconnected with EVB via the BTB connector J0501.
Customers can select different codecs according to their own application demands, and also can use AT
command to switch between codecs. Two examples are provided below. For more details, please refer to
document [5].
 AT+QDAI=3: switch codec from TLV320AIC3104 to ALC5616
 AT+QDAI=5: switch codec from ALC5616 to TLV320AIC3104
The following figure show a reference design for the connection between digital audio codec boards and
the EVB.
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
U0101
ALC5616/TLV3104
LTE-QuecOpen
Module
VDD_EXT
4.7K 4.7K
BCLK
LRCK
DACDAT1
ADCDAT1
SCL
SDA
MIC_BIAS
MIC_BIAS
IN2P
IN2N
LOUDL/P
LOUDR/N
R
C
HPO_R
HPO_L
J0802
J0801
speaker
J0805
NCP2823
2
4
5
3
1
6
J0801
MIC
BTB CON
BTB CON
J0804 J0804
Figure 13: Reference Design for Connection between Codec Board and EVB

Quectel LTE OPEN EVB Specifications

General

Brand	Quectel
Model	LTE OPEN EVB
Category	Control Unit
Language	English