Nordic 3 - Digital Microphones (Only for Use with Nrf52 DK); Nrf51 DK Interface

5 Hardware description: Smart Remote 3 DK add-on
Doc. ID 4374_139 v1.1
Page 37
R12
10R
C25
100nF
C24
100nF
I2S MCLK
I2C_DATA
I2C_CLK
I2S DOUT
I2S SCLK
I2S LRCK
R9
4k3
R10
4k3
C26
100nF
JP2
Jumper
P11
VMOB6027D
VCC
VCC
VCC VCC
+
C21
10
µ
F
C27
100nF
+
C22
10
µ
F
+
C20
10
µ
F
C17
1.0
µ
F
R17
0R
JP1
Jumper
C12
1.0
µ
F
1
2
3
P10
Pin List 1x3
C11
1.0
µ
F
C10
1.0
µ
F
R6
2k2
R5
0R
C8
100nF
R7
N.C.
R8
0R
VCC
VCC
C23
100nF
+
C19
10
µ
F
C13
N.C.
C14
N.C.
R18
33R
R16
33R
R14
33R
R13
0R
R11
0R
R15
1k
FB1
600R/0.3A
C9
1.0
µ
F
N.C.
+
C7
100
µ
F
1
2
P9
Pin List 1x2
L
2
R
3
GND
1
J1
JACK, PHONO
Vmic
C16
N.C.
C15
10nF
C18
N.C.
VCC
Vmic
SB16
SB15
MCLK
1
DVDD
2
LRCK
7
D
M
I
C
_
S
C
L
9
PVDD
3
DGND
4
N
C
1
0
N
C
1
1
GND
6
N
C
1
2
A
S
D
O
U
T
8
A
G
N
D
1
3
N
C
1
4
NC
15
M
I
C
BI
A
S
2
5
C
E
2
6
NC
16
AVDD
17
AGND
18
ADCVREF
19
VMID
20
RIN2
21
L
I
N
2
2
2
R
I
N
1
2
3
L
I
N
1
2
4
C
C
L
K
2
8
C
D
A
T
A
2
7
ES8218
SCLK
5
E
P
2
9
U1
ES8218
Figure 26: Codec and appurtenant components
5.3.8 Digital microphones (only for use with nRF52 DK)
The Smart Remote 3 DK add-on is equipped with two digital output PDM microphones.
The microphones are configured so that they can be used to sample stereo audio, but are by default set
to mono audio. The microphones are by default disconnected from the power supply and the interface
connectors. To connect to the development kit and enable power, solder bridges SB34, SB35, and SB27 must
be shorted, see the schematic below:
C36
10
µ
F
C35
10nF
MIC_CLK
MIC_DOUT
R22
100R
C40
15pF
C39
15pF
MIC_DOUT
MIC_CLK
VDD
3
LR
2
CLK
1
DOUT
4
GND
5
U4
MP34DB01
C43
10
µ
F
C42
10nF
R24
100R
C45
15pF
C44
15pF
VDD
3
LR
2
CLK
1
DOUT
4
GND
5
U6
MP34DB01
FB2
600R/0.5A
SB27
VCC_PDM
FB3
600R/0.5A
SB34
SB35
Figure 27: Digital microphones
5.3.9 nRF51 DK interface
Connectors P1, P3, P4, P6, P7, and P8 are used to connect the DK add-on to the nRF51 DK.
Through these connectors, all the functionality of the DK add-on can be accessed by the nRF51 DK. See Table
2: nRF51 DK interface connections on page 38 for pin information.