VCC
R2
1k
PG7
PG6
OP5
OP4
OP3
OP4
1
2
J2
VCC
R1
1k
OP3
1
2
J1
VCC
R3
1k
OP5
1
2
J3
2
4
3
1
S1
SKQTLCE010
J9
SMA FEMALE
1
2
3
4
5
C19
1 PF
TP8
RESET
C18
NM
C1
100 nF
C2
2.2 PF
VCC_CORE
C7
2.2 PF
C4
2.2 PF
C8
100 nF
C3
100 nF
VCC
VCC_CORE
VCC
1
2
J10
VCC_CORE_IN
J5
UART
C13
1 PF
C14
1 PF
C15
1 PF
R15
NM
R13
OR
R16
NM
R17
OR
VCC
VCCVCCVCC
TP6
VIN
1
3
+
C11
1 PF
C9
100 pF
J7
BATTHOLDER
J6
DC-015PBT
5V MAX
1
3
2
+ -
C17
1 PF
C16
1PF
R4
330R
R5
330R
PG6 PG7
U2
MAX3225
U3
LP3965-3.3V
VOUT
BYPASS
GND
VIN
VEN
5
4
2
+
C12
1 PF
C9
100 nF
J8
DB9 MALE
TP1TP2TP3TP4
TP5
5
9
4
8
3
7
2
6
1
R14
OR
R18
NM
R11
10k
R12
10k
1
2
3
4
5
6
7
8
9
TXD
CTS#
RXD
RTS#
BAUD RATE SETTINGS
JUMPER
921K 115K NVS
SHORTSHORTSHORTJ1
OPENSHORTSHORTJ2
OPENOPENSHORTJ3
2
4
5
6
13
12
15
10
14
20
19
17
16
9
8
3
7
11
1
18
C1+
C1-
C2+
C2-
T_IN
T_IN
R_OUT
R_OUT
FORCEON
FORCEOFF
VCC
T_OUT
R_IN
R_IN
T_OUT
V+
V-
READY
GND
TP7
GND
1 2
D1
RED
1 2
D2
BLUE
R10
NM
R9
OR
R8
OR
R7
OR
R6
OR
J4
AUDIO
1
2
3
4
5
6
SCLK
STD
SFS
SRD
C6
22 pF
Y1
32.768 kHz
VCC
C5
22 pF
U1
LMX9838
19
7
25
26
16
44
43
28
27
42
41
40
23
22
21
20
39
38
37
15
14
13
12
36
35
10
11
6
34
33
8
9
5
2
1
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
32
31
30
29
24
18
17
4
3
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
GND
GND
GND
GND
GND
GND
GND
GND
GND
PG7
PG6
OP5
OP4/PG4
OP3
NC
NC
32k-
32k+
NC
NC
NC
SRD
STD
SFS
SCLK
NC
NC
NC
CTS#
RTS#
TXD
RXD
NC
NC
VCC
VCC_IO
MVCC
NC
NC
XOSCEN
VCC_CORE
NC
RESET#
NC
INVALD
Network required if using external source.
Vcc_core open if using internal regulator.
Vcc grounded if Vcc_core using external source.
(for Vcc_core using external source, refer to figure 12)
(for Vcc_core using internal source, refer to figures 10 and 11)
LMX9838
SNOSAZ9F –JULY 2007–REVISED DECEMBER 2014
www.ti.com
9.1.1 Design Requirements
9.1.1.1 Evaluation Design
28 Submit Documentation Feedback Copyright © 2007–2014, Texas Instruments Incorporated
Product Folder Links: LMX9838
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