Integration Guide

SMK900 Integration Guide Revision 4
20
4
7
IO_9
MISO
I
(O)
Generic I/O. Alternately, hardware SPI Master In Slave
Out pin, or OC1A Timer C wave out Channel A.
21
14
IO_8
MOSI
I
(O)
Generic I/O. Alternately, hardware SPI Master Out Slave
In pin, or OC1B Timer C wave out Channel B.
22
17
20
IO_7
/SS
I
(O)
Generic I/O. Alternately, hardware SPI enable pin.
23
18
IO_10
SCK,
MIRROR
I
(O)
Generic I/O. Alternately, hardware SPI port clock, or
MCU event mirror output pin.
24
1, 13
4,16
3.3V
-
O
Stable, low-power 3.3V output. Use with low-power
devices only (<10 mA average power consumption, <20
mA peak consumption).
25
24
IO_0
ADC_EXT
_
REF
Generic I/O. Alternately, ADC external reference voltage
pin. The voltage at this pin can be used by the ADCs as a
reference for ratiometric measurements.
26
RSVD
-
27
RSVD
-
Reserved pin. Leave unconnected.
28
10
1,13,28
GND
-
Connect to the host circuit board ground plane.
29
RSVD
-
Reserved pin. Leave unconnected.
30
10
1,13,28
GND
-
Connect to the host circuit board ground plane.
2
DM
-
I/O
USB negative wire (white)
3
DP
-
I/O
USB positive wire (green)
13