CDC3207G-C Micronas Intermetall GmbH, CDC3207G-C Datasheet - Page 9

• Manufacturer Part Number: CDC3207G-C
• Description: ARM7-Based Car Dashboard Controller
• Manufacturer: Micronas Intermetall GmbH

PRELIMINARY DATA SHEET
2.4. External Components
Fig. 2–2:
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
+5V Supply
ESR < 14
Low ESR
4.7k
Tantal
CDC3207G-C: Recommended external supply and quartz connection.
3.3
Tantal
10
100n to 150n
47n
Ceramic
Ceramic
470n
220n
18p
18p
X7R
X7R
FVDD
FVSS
UVDD
UVSS
VDD
VSS
XTAL1
XTAL2
RESETQ
June 12, 2003; 6251-589-1PD
3.3V
5V
2.5V
5V
Flash
5V
2.5V
HVDD0 to 3
HVSS0 to 3
VREFINT
BVDD
AVDD
AVSS
4 x 100n to 150n
10n, Ceramic
150n
Ceramic, X7R
100n to 150n
CDC 3207G-C
+5V
Supply
System
Ground
Analog
Supply
Analog
Ground
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