Rainbow Electronics DS28DG02 - Manual (Page 32)

DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
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Figure 24. Crystal Placement on PCB
Local ground
plane beneath
signal plane or on
other side of pcb
Guard ring on
signal plane
Crystal
Pad
Crystal
Pad
VIA to ground plane
X1
X2
RSTZ
NC X2 X1 NC
Crystal Pads
Local ground plane
beneath signal plane
or on other side of pcb
VIA to ground plane
Guard ring on
signal plane
TSSOP TQFN
Typical Operating Circuit
R
P
R
P
V
CC
MOSI
MISO
SCK
µC
PX.1
PX.0
INT
RST
GND
V
CC
SI PIO0-7
SO PIO8
SCK
CSZ
PIO9-11
DS28DG02
WPZ
WDI
WDOZ X1
ALMZ
X2
RSTZ
V
BAT
GND
V
CC
32KHz
3V
R1
Manual
Reset
R2
12.5pF load,
ESR
≤ 45kΩ
R1, R2 4.7k Ω LED
Piezo
Beeper
Push
Buttons
R
L