Rref Connection; Crystal Connection; Figure 7-2. Rref Connection; Figure 7-3. Crystal Connection - Renesas mPD720231 User Manual

μ
PD720231

7.3 RREF Connection

Remark The board layout should minimize the total path length from RREF through the resistor to GND
and path length to GND. GND must be stable.
Due to analog sensitivity, 1.60 K within
parallel should not be used in place of a single 1.60 K resistor.

7.4 Crystal Connection

The following crystal is evaluated on our reference design board. Table 7-2 shows the external parameters.
NDK
Remark Clock shall be 30 MHz within 100ppm. Moreover optimal crystal
R19UH0094EJ0100 Rev 1.00
Mar 1, 2013
Figure 7-2.
Figure 7-3.
µPD720231
XT1
XT2
Table 7-2.
Vendor Crystal
NX2520SA, 30MHz
parameters and RC component values may be affected by the PCB
layout.
7. How to Connect to External Elements
RREF Connection
µPD720231
RREF
1.6 Kohm ± 1%
GND
1% must be used, and two or more resistors in series or
±
Crystal Connection
Crystal
R
C2
External Parameters
R
100 Ω
C1
C1 C2
12 pF 12 pF
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