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3.3
Power Supply
The S5U13781R00C100 reference board is designed to supply VDDCORE (1.5V) and LED back light
power (LED+/LED-) from the 2.7V to 5.5V input of J4-4 (VDD DCDC).
The voltage output of 2.7V to 3.3V from J4-3 (VDDIO) is used for the U4 (S1D13781 Display
Controller) power supply, D2 (LED indicator) and Y1(SG-310SCF 24MHz OSC).
The power for U2 (M25P-16-VMN6P SPI flash memory) is supplied via J1-2 (FLASH-VCC).
3.3.1 VDDCORE
VDDCORE (1.5V) is generated from U1 (BU15TD3WG Voltage regulator) and is used to supply power
to COREVDD and PLLVDD of U4 (S1D13781 Display Controller).
3.3.2 LED Back Light LED+/LED- Power Supply
The LED back light power supply (Maximum voltage between LED+ and LED- is 38V) is generated by
U3 (TPS61161A voltage booster).
The output current is set by J3 as described in Table 3-2, Jumper Settings. Connecting one of J3 3-4, J3 5-
6 or J3 7-8 allows 20mA, connecting any two of them allows 40mA and connecting all of them allows
60mA output, maximum.
Power Supply
VDDIO
Input
VDDDCDC
Input
FLASH-VCC
Input
VDDCORE
Output
LED+ / LED-
Output
Note: Do not short the power supply pins to any other pins.
X94A-G-004-01
Issue Date: 2012/03/26
Table 3-3 Power Supply for S5U13781R00C100
Usage
IOVDD for U4 (S1D13781 Display Controller)
Power supply for Y1 （SG-310SCF 24MHz OSC）
Power supply for D2(SML-E12M8WT86 LED)
Power supply for U1 (BU15TD3WG 1.5V LDO regulator）
Power supply for U3(TPS61161A voltage booster)
Power supply for U2(M25P16-VMN6P SPＩ flash memory
COREVDD and PLLVDD for U4 (S1D13781 LCD
controller)
LED back light power supply
Seiko Epson Corporation
Voltage Range
2.7V ～ 3.6V
2.7V ～ 5.5V
2.7V ～ 3.6V
1.5V (Fixed)
VDDDCDC ～ 38V
S5U13781R00C100 Reference Board User Manual
Page 9
Revision 1.0
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