Welch Allyn Atlas - Page 6

A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
Supply RF/EMI
Filters and Reset
Circuits
FPGA decoupling caps
MPC823 decoupling caps
System Clock
1536*830 < XFC < 1536*1470 pf Value selected for the final mulitplication ratio
RF Suppression
to CPU
System
Place decoupling capacitors next to CPU VDDSYN pin B1 and VSSSYN pin A1 and A2
Split ground plane under these components
’244
decoupling cap
DRAM decoupling caps
Place these components
as close to the
processor as possible
Use separate PPL VDDSYN power plane from 3.3V plain
to CPU PLL pins A1
and A2
FPGA Clock
FLASH decoupling caps
to CPU PLL
pin B1
to CPU 32KHz
Clock
PLL Filter
Capacitor
MPC823 PLL
Supply
RF Suppression
Oscillator
decoupling
cap
Jim Belesiu
Jim Belesiu
Mar 5, 1999
Mar 5, 1999
620005.dsn
5-39173
JAC
3/18/99 LPP
L. Phillips
Z. Psenicnik
J. Bello
3/19/99
3/19/99
3/19/99
FM Section for spreading RF
emissions. R2 selects the
deviation.
Load C107 w/1.5uF and unload C1 for non-FM clocking
From FPGA
B
ZIP4/15/99JJC5-39353
frequency modulation
Component change for
Change Reset IC U3,
No Load C40
C 6/24/995-39830 LPP
620005
C
Power Distribution, Clocks and Reset
C
66Thursday, June 24, 1999
Title
Size
Document Number
Rev
Date: Sheet of
Welch Allyn Inc.
Schematic:
Release For Production
Approved
Checked
Designed
Drawn
Initial Date
REV
Description
ECN/ECO Init
Date Ckd
A Release to Production
xtalp
VCLK
VSSSYN
Q1-Base
PORESET-Input
XFCX
+3.3V_unfiltered
HRESET
HRESET_n
Video-Clock-25
Vbackup
EXTAL
PORESET_n
EXTCLK
XFC
+3.3V_unfiltered
XTAL
PA14
VDDH
VDDSYN
VDDH
VDDL
VDDH
VDDH
KAPWR
VDDH
VDDH
VDDH
VDDH
VDDH
C111
6.8uF
12
C110
6.8uF
12
C28
100nF
12
C130
NL
12
C29
100nF
12
C108
22pF
12
C43
100nF
12
Y1
32768Hz
1 2
C44
100nF
12
C115
330pF
1 2
R118
NL
R513.9M
R119
NL
R50 200K
C41
100nF
12
C42
100nF
12
C39
100nF
12
L1
Ferrite-120
1 2
C106
100nF
12
R123
100K
C16
6.8uF
12
L3
Ferrite-120
1 2
R122
12.4K
C18
6.8uF
12
U3
2.0V
12
3
Reset_nInput
Gnd
Q1
NL
3
1
2
R94
NL
R121
NL
C37
6.8uF
12
C116
330pF
12
C120
6.8uF
12
C38
6.8uF
12
R52
33
C114
330pF
1 2
C13
100nF
12
C15
100nF
12
C6
100nF
12
C14
6.8uF
12
C118
330pF
1 2
C7
100nF
12
C109
22pF
12
R2
1K
R117
200K
C17
100nF
12
C119
330pF
1 2
C1
1.5uF
12
R124
1.58K
C36
100nF
12
C128
100nF
12
C40
100nF
12
R1
100
C4
100nF
12
C5
100nF
12
C2
100nF
12
C12
6.8uF
12
C21
100nF
12
C22
100nF
12
C107
NL
12
L2 Ferrite-120
1 2
C19
100nF
12
U2
3.0V
12
3
Reset_nInput
Gnd
G1
SG-636PCE-25.175M
1
2 3
4
OE
GND OUT
VDD
C20
100nF
12
C30
100nF
12
C113
6.8uF
12
C31
100nF
12
C117
330pF
12
C112
6.8uF
12
C32
100nF
12