CDC1631F-E Micronas Intermetall GmbH, CDC1631F-E Datasheet - Page 11

• Manufacturer Part Number: CDC1631F-E
• Description: Automotive Controller Specification
• Manufacturer: Micronas Intermetall GmbH

ADVANCE INFORMATION
2.3. External Components
Fig. 2–2: Recommended external supply and quartz connection for low electromagnetic interference (EMI)
To provide effective decoupling and to improve EMC behav-
ior, 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 capacitance of
the interconnecting traces determine the self-resonant fre-
quency of the decoupling network. A frequency too low will
reduce decoupling effectiveness, increase RF emissions and
may affect device operation adversely.
XTAL1 and XTAL2 quartz connections are especially sensi-
tive to capacitive coupling from other printed circuit board
signals. It is strongly recommended to place quartz and
oscillation capacitors 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 47 nF 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
sufficient for proper Wake Reset functionality.
Micronas
C = 100 n to 150 n
System
Ground
Resetq
+5 V
+5 V
4.7 k
C
47 n
C
L
18 p
18 p
June 11, 2003; 6251-617-1AI
200 s,
UVSS
VDD
XTAL1
XTAL2
UVDD
RESETQ
VSS
IC
HVDD 0 to 1
HVSS 0 to 1
AVDD
VREF
AVSS
10 n
C = 100 n to 150 n
2 * C
C
+5 V
+5 V
System
Ground
Analog
Ground
CDC1631F-E
Analog
11