Laird BA600, User Manual, Page: 27 / 30

Bx600 Series of Breakout Boards for BL600 module
User Guide
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth 27 Laird
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A
PPENDIX
I – N
ON
-
POPULATED
C
IRCUITRY ON
B
REAKOUT
B
OARDS
5.1 ADC Input Voltage Scaling through R4, R5, and C5
Figure 27 schematic shows the ADC input scaling circuit only. The BA600 and BB600 breakout boards have R4
populated as 0 ohms and must be modified when R5 is fitted to match ADC configuration. Customer injects an
external analog voltage (greater than BL600 Maximum allowed ADC input voltage into BL600 of 3.6V) to sense
into PTH via 6. Refer to the BL600 HIG pages for how to select value of C5 that needs to be fitted.
Figure 27: ADC input voltage scaling circuit for ADC on SIO_4
C5
NOPOP
R4
0R
SIO_4
R5
NOPOP
U1
CON_SM_44
GND
1
SIO_1/AIN
2
GND
3
SIO_2/AIN
4
SIO_3/AIN
5
SIO_4/AIN
6
VCC
10
GND
11
SIO_8
12
SI
O_1
0
14
SI
O_1
1
15
SI
O_1
2
16
GN
D
17
SI
O_1
3
18
SIO_5/AIN
7
SIO_6/AIN
8
SI
O_1
6
21
nR
ESET
22
NC
23
SI
O_1
7
24
SI
O_1
8
25
SI
O_1
9
26
SI
O_2
0/
N
C
27
GN
D
28
SI
O_2
8
40
SI
O_2
7/
N
C
39
SI
O_2
6/
N
C
38
GN
D
37
SI
O_2
5
36
SI
O_2
3
34
SI
O_2
4
35
SI
O_2
2
33
SI
O_2
1
32
GN
D
31
R
F
_AN
T
30
GN
D
29
SIO_7
9
SI
O_9
13
SI
O_1
4
19
SI
O_1
5
20
SI
O_2
9
41
SI
O_3
0
42
GN
D
43
SI
O_0
44
GND
6
1