AN2344 Freescale Semiconductor / Motorola, AN2344 Datasheet - Page 3

• Manufacturer Part Number: AN2344
• Description: HC908EY16 EMI Radiated Emission Results
• Manufacturer: Freescale Semiconductor / Motorola

TEM Cell Test Board Information
Test PCB Hardware
MOTOROLA
TP5
IRQ
CONNECTION
TP3
TEST POINT
TP1
TEST POINT
VSS
R13
1K
SW PUSHBUTTON
1
VSS
S1
VSS
+
10uF
C1
2
VSS
VDD
R12
10K
C2
0.1uF
VSS
VDD
VSS
VDD
VSS
VDD
VSS
D1
9V1
SOT-23(AKN)
R19
10K
VDD
C11
0.1uF
VSS
C3
0.1uF
VDD
C7
0.1uF
RESET
C5
0.1uF
C4
1nF
C8
1nF
C6
1nF
IRQ
RESET
The standard board used for TEM Cell testing is specified by the SAE J1752/3
specification. It is a 4-inch square board consisting of 1 ground plane, which
serves as a shield and is electrically connected to the body of the TEM, 2
signals layers and a ground plane. Only the IC being evaluated and necessary
vias and traces are located on the bottom side of the board to obtain the most
accurate measurement of emissions from the device. All support circuitry and
cabling is located on the top side of the board. The schematic for the TEM cell
PCB for the HC908EY16 is shown in
28
27
29
26
30
25
17
13
Freescale Semiconductor, Inc.
U1
HC908EY16 (REV0.3)
VDD
VSS
VDDA
VSSA
VREFH
VREFL
IRQ
RST
HC908EY16 EMI Radiated Emissions Results
For More Information On This Product,
Figure 1. TEM Cell PCB Schematic
PTB6/TBCH0/AD6
PTB7/TBCH1/AD7
PTA5/SPSCK
PTD0/TACH0
PTD1/TACH1
PTC2/MCLK
PTC3/OSC2
PTC4/OSC1
PTA0/KBD0
PTA1/KBD1
PTA2/KBD2
PTA3/KBD3
PTA4/KBD4
PTC0/MISO
PTC1/MOSI
PTE1/RXD
PTB0/AD0
PTB1/AD1
PTB2/AD2
PTB3/AD3
PTB4/AD4
PTB5/AD5
PTE0/TXD
PTA6/SS
Go to: www.freescale.com
3
2
1
32
31
20
19
18
14
12
11
10
9
5
4
22
21
8
7
6
15
16
23
24
VSS
VSS
PTA0
10K
10K
10K
10K
10K
10K
10K
10K
10K
10K
10K
10K
VDD
R1
10K
R9
R11
R17
R3
R2
R6
R7
R14
R16
R15
R5
R4
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
TP2
TEST POINT
CONNECTION TO
FUNCTION GENERATOR
R18
330R
R8
10M
TP4
MONITOR
MODE
CONNECTION
1
D2
Figure 1 . TEM Cell PCB
R10
0R
8MHz
Y1
2
VSS
C10
C9
22pF
22pF
VSS
Y1, R8, R10, C9 and C10 are not
fitted when ICG is used.
Title
Size
Date:
B
TEM Cell Test Board Information
MC68HC908EY16 SAE J1752/3 EMC BOARD
Document Number
<Doc>
Friday, June 14, 2002
Schematic.
Sheet
1
AN2344/D
of
1
Rev
1
3