ARM ARM7TDMI - Power Supply; A.3 Power Supply

Open Access
A-4
ARM Development Board (ARM7TDMI Version)
Hardware Reference Guide
ARM DUI 0017C
Board Schematics
A.3 Power Supply
Date: February 26, 1996 Sheet
Size Document Number
B ARM EOI-0011B (POWER
Title
Power Supply
CB1 4JN
Cambridge
Cherry Hinton
Fulbourn Road
(c) ADVANCED RISC MACHI
N
INSERT LOAD IF REQUIRED
JP2
JUMPER
C3
10u
VPP
GND GND
BOARD GROUND
BOARD 5V
PCMCIA VPP SUPPLY (optional)
GND
VCC
VPP
DC_OK FROM PC PSU
P8
P9
-5V FROM PC PSU
-12V FROM PC PSU
1
2
3
4
5
6
7
8
9
10
11
12
J1
CON12
PSU5V
PSU12V
PSUGND
PSUGND
PSUGND
PSUGND
PSU5V
PSU5V
PSU5V
PC STYLE POWER CONNECTOR
C4
10u
IN
3
OUT
2
ADJ
1
U1
LM317T
PSU5V
HEADER POWER SUPPLY - VDD (3V3)
D1
1N4001
C2
1u
JP1
JUMPER
D2
1N4148
R2
200R
1206
POWER (3V3)
VPP IS REQUIRED WHEN USING PCMCIA
INTERFACE, EVEN IF 12V IS NOT
ACTUALLY REQUIRED BY THE CARD
R4
470R
VDD
VDD
POWER (5V)
R1
470R
VCC
D3
LED
GREEN
GND
D4
LED
GREEN
GND
GND
C1
10u
R3
330R
1206
Vout = 1.25(1 + (R3/R2)) + .00005.R3
VOLTAGE REGULATOR OUTPUT
PSUGND
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