CDC3272G-C Micronas Intermetall GmbH, CDC3272G-C Datasheet - Page 9

• Manufacturer Part Number: CDC3272G-C
• Description: ARM7-Based Car Dashboard Controller
• Manufacturer: Micronas Intermetall GmbH

ADVANCE INFORMATION
2.4. External Components
Fig. 2–3:
To provide effective decoupling and to improve EMC behav-
iour, the small decoupling capacitors must be located as
close to the supply pins as possible. The self-inductance of
these capacitors and the parasitic inductance and capaci-
tance of the interconnecting traces determine the self-reso-
nant frequency of the decoupling network. Too low a fre-
quency will reduce decoupling effectiveness, will increase
RF emissions and may adversely affect device operation.
XTAL1 and XTAL2 quartz connections are especially sensi-
tive to capacitive coupling from other pc board signals. It is
strongly recommended to place quartz and oscillation capac-
itors as close to the pins as possible and to shield the XTAL1
and XTAL2 traces from other signals by embedding them in
a VSS trace.
The RESETQ pin adjacent to XTAL2 should be supplied with
a 47nF capacitor, to prevent fast RESETQ transients from
being coupled into XTAL2, to prevent XTAL2 from coupling
into RESETQ, and to guarantee a time constant of 200 s
sufficient for proper Wake Reset functionality.
Micronas
Supply
System
Ground
Resetq
+5V Supply
+5V
Low ESR
4k7
Tantal
CDC3207G-C: Recommended external supply and quartz connection.
10
100n to 150n
47n
Ceramic
220n
18p
18p
X7R
UVDD
UVSS
VDD
VSS
XTAL1
XTAL2
RESETQ
April 30, 2003; 6251-615-1AI
5V
2.5V
5V
2.5V
HVDD0 to 3
HVSS0 to 3
VREFINT
BVDD
AVDD
AVSS
100n to 150n
10n, Ceramic
150n
Ceramic
X7R
4 x 100n to 150n
CDC 3272G-C
+5V
Supply
System
Ground
Analog
Supply
Analog
Ground
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