Ublox LENA-R8 Series, System Integration Manual

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LENA-R8 series - System integration manual
UBX-22015376 - R02 Design-in Page 85 of 116
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• The module’s I2S interface is connected to the related pins of the external audio codec.
•
The GPIO6 digital clock output is connected to the clock input of the external audio codec to
provide clock reference.
• The external audio codec is controlled by the LENA-R8 series module using the I2C interface, which
can concurrently communicate with other I2C devices and control an external audio codec.
• The V_INT 1.8 V supply output is connected to some supply input pins of the external audio codec.
•
Additional components are provided for EMC / EMI / ESD immunity: a 10 nF bypass capacitor and
a series ferrite bead noise/EMI suppression filter provided on each microphone line and speaker
line of the external codec. The necessity of these or other additional parts for possible EMC, EMI
or ESD immunity improvement may depend on the specific application board design.
As various external audio codecs other than the one described in Figure 65 and Table 46 can be used
to provide voice capability, the appropriate specific application circuit must be implemented and
configured according to the particular external digital audio device or audio codec used and according
to the application requirements.
LENA-R8 series
BCLK
GND
U1
LRCLK
Audio
Codec
DACDAT
ADCDAT
SDA
SCL
MCLK
C4 C2 C1
1V8
1V8
MICBIAS
C17 R3
C5
C6
INN
INP
D1
Microphone
Connector MIC
C12 C11
J1
R4
C8 C7
D2
SPK
Speaker
Connector
LOUTP
LOUTN
J2
C10 C9 C14 C13
EMI3
EMI4
EMI1
EMI2
GPIO6
26
SDA
27
SCL
19
GND
4
V_INT
36
I2S_CLK
34
I2S_WA
35
I2S_TXD
37
I2S_RXD
R1 R2
C15
C16
3V0
3V0
C3
Figure 65: Illustrative application circuit for the I2S interface with an external audio codec to provide voice capability
Reference Description Part number - manufacturer
C1, C3 10 µF Capacitor Ceramic X5R 0603 20% 6.3 V GRM188R60J106ME47 – Murata
C2, C4 100 nF Capacitor Ceramic X5R 0402 10% 10V GRM155R71C104KA01 – Murata
C5, C6, C15, C16 1 µF Capacitor Ceramic X5R 0402 10% 6.3 V GRM155R60J105KE19 – Murata
C17 4.7 µF Capacitor Ceramic X5R 0402 20% 6.3 V GRM155R60J475ME47 – Murata
C7, C8, C9, C10 27 pF Capacitor Ceramic COG 0402 5% 25 V GRM1555C1H270JZ01 – Murata
C11, C12, C13,
C14 10 nF Capacitor Ceramic X5R 0402 10% 50V GRM155R71C103KA88 – Murata
D1, D2 Low Capacitance ESD Protection USB0002RP or USB0002DP – AVX
EMI1, EMI2,
EMI3, EMI4 Chip Ferrite Bead Noise/EMI Suppression Filter
1800 Ohm at 100 MHz, 2700 Ohm at 1 GHz BLM15HD182SN1 – Murata
J1 Microphone Connector Various manufacturers
J2 Speaker Connector Various manufacturers
MIC 2.2 k  Electret Microphone Various manufacturers
R1, R2
10 k

Resistor
Various manufacturers
R3, R4 2.2 k  Resistor Various manufacturers
SPK 32  Speaker Various manufacturers
U1 Ultra-Low Power Audio CODEC ALC5616 – Realtek Semiconductor
Table 46: Example of components for audio voice codec application circuit