Z51F3220FNX Datasheet, PDF (48/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
7.22 Recommended Circuit and Layout
VDD
VSS
{ } This 0.1uF capacitor should be within
1cm from the VDD pin of MCU on the VDD VCC
PCB layout.
0.1uF
+
0.1uF
DC Power
I/O
XIN
XOUT
SXIN
SXOUT
0.01uF
VCC
High-Current Part
{ } Infrared LED,
FND( 7- Segment),
,,,,,
etc
{ } The MCU power line(VDD and VSS)
should be separated from the hig-h
current part at a DC power node on
the PCB layout.
{ } This 0.01uF capacitor is alternatively
for noise immunity.
X-tal
C1
C2
32.768kHz
The main and sub crystal should be
as close by the MCU as possible.
The load capacitors of the sub clock
- C1, C2: CL x 2 ± 15%
- CL = (C1 x C2)/(C1 + C2) - Cstray
- CL: the specific capacitor value of crystal
- Cstray: the parasitic capacitor of a PCB(1pF – 1.5pF)
Figure 7.15 Recommended Circuit and Layout
PS029902-0212
PRELIMINARY
45