ZULU
Pin Description (continued)
Pin No
17
18
19
20
21
22
23
24
25
26
27
Name
P2.5
P2.4
P2.3
P2.2
XTAL4
XTAL3
P2.1
P2.0
P1.7
P1.6
P1.5
Direction
D In / Out
or A In
D In / Out
or A In
D In/Out
or A In
D In/Out
or A In
AO
A in
D In/Out
or A In
D In/Out
or A In
D In/Out
or A In
D In/Out
or A In
D In/Out
or A In
Description
Port 2.5.
See Si1000 Port I/O section for a complete description.
Port 2.4.
See Si1000 Port I/O section for a complete description.
Port 2.3. See Si1000 Port I/O section for a complete
description.
Port 2.2. See Si1000 Port I/O section for a complete
description.
SmaRTClock Oscillator Crystal Output.
SmaRTClock Oscillator Crystal Input.
Port 2.1.
See Si1000 Port I/O section for a complete description.
Port 2.0.
See Si1000 Port I/O section for a complete description.
Port 1.7.
See Si1000 Port I/O section for a complete description.
Port 1.6.
See Si1000 Port I/O section for a complete description.
Port 1.5.
See Si1000 Port I/O section for a complete description.
RF22 peripheral interrupt status pin. Will be set low to
indicate a pending EZRadioPro interrupt event. See the
Silabs AN440 Control Logic Registers for more details.
This pin is an open-drain output with a 220k internal pull-
up resistor. An external pull-up resistor is recommend-
ed.
AO EZRadioPro peripheral crystal oscillator output. Con-
nect to an external 30 MHz crystal or leave floating if
driving the XIN pin with an external signal source.
EZRadioPro peripheral crystal oscillator input. Connect
to an external 30 MHz crystal or to an external source.
If using an external clock source with no crystal, dc cou-
pling with a nominal 0.8 VDC level is recommended with
a minimum ac amplitude of 700 mVpp.
28
NIRQ
D Out
29
XOUT
A Out
30
XIN
A in
DS-ZULU-2
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