Datasheet

Ext +3.3V IN
TieNet
+3.3V OUT
3.3V
(GND1)
(GND2)
GND
Power & LEDs
Ext +5V IN
Jump cross J33, and Jump cross J34 (1-2), Open J34 and J39 - use ext +5V to supply +3.3V
Jump cross J34 (2-3), Open J33 and J39 - use external +3.3V
Jump cross J39, Open J38 - use USB to supply +3.3V
1
1
Parts not used
1
2
J33
TP10
TP16
R58
200
+
C42
10uF
+
C41
10uF
+
C36
10uF
1
2
J39
1
2
3
J34
1
2
3
4
J38
TP13
TP4
IN
GND
EN
FB
OUT
U5
TPS76333DBV
R19
10K
D1
LTST-C190YKT
R3
10K
D2
LTST-C190CKT
R1
100
R11
100
1
2
3
J5
R18
4.7K
R2
4.7K
1
2
3
J2
Q1
MMBT3904TT1G
Q2
MMBT3904TT1G
SH1
D5
LTST-C190YKT
R66
10
C38
1.0uF
C40
1.0uF
V33A
[1,2,8]
USB_V33
[6]
+3_3V
[1,2,4,5,6,9]
DGND
DGND
DGND
DGND
+3_3V
[1,2,4,5,6,9]
PWM0
[1,2,5]
SCI_TX0
[1,2,5]
SCI_RX0
[1,2,5]
PWM1
[1,2,5]
+3_3V
[1,2,4,5,6,9]
DGND
AGND
+3_3V
[1,2,4,5,6,9]
AGND
+5V_EXT
DGND
DGND
+3_3V
[1,2,4,5,6,9]
+3_3V
[1,2,4,5,6,9]
www.ti.com Schematics
Figure 4. UCD3138OL64EVM-031 Schematics (Bias and LEDs) 4 of 9
7
SLUUA10–October 2012 Using the UCD3138OL64EVM-031
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