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Integration Guide

ManualsBrandsSmartrek Technologies ManualsElectronics900 MHz Mesh Network Long Range Transceiver Module
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SMK900 Integration Guide Revision 4
Module Pin Out
Electrical connections to the SMK900 are made through the I/O pads and through the I/O pins
(depending on whether it is the SMT castellated or the through-hole version). The hardware I/O
functions are detailed in the table below (note that the MCU alias is useful only when using advanced
VM programming using accessible native MCU functionalities, and only the mutable generic I/O pins
are available for such purposes, and are denoted by the principal name IO_x, where x is the generic pin
number as used in VM programming):
PIN
TH
PIN
XB
PIN
SMD
NAME
ALIAS
I/O
DESCRIPTION
1
10
1,13, 28
GND
-
-
Power supply and signal ground. Connect to the host
ground.
2
6
9
IO_12
TX_LED
O
(I)
Transmit LED pin. This pin activates only when a radio
transmission is active.
3
9
12
IO_11
BCAST_
LED
O
(I)
Broadcast LED pin. This pin activates/deactivates itself in
order to mark the beginning and the end of a broadcast
cycle.
4
15
I2C_PWR
-
O
I2C Power pin. Can be configured by changing the
powerBusMode byte in the I2C configuration register.
Allows to turn on/off an I2C peripheral connected to the
module on demand when required (usually when a VM
execution is running after a broadcast cycle).
5
2
5
TXD
-
O
Serial data output from the radio.
6
3
6
RXD
-
I
Serial data input to the radio.
7
12
15
/CTS
-
O
Host serial port CTS pin. When the line goes high, the
host must stop sending data.
8
14
IO_2
RTS
I
(O)
Generic I/O.
9
8
11
IO_5
DAC0
I
(O)
Generic I/O. Alternately, hardware DAC channel 0.
10
7
10
I2C_SCL
-
O
I2C Master SCL clock pin. This pin should be pulled via
resistor to a 3.3V high line (possibly the 3.3V_OUT pin).
11
19
22
I2C_SDA
-
I/O
I2C Master SDA data pin. This pin should be pulled via
resistor to a 3.3V high line (possibly the 3.3V_OUT pin).
12
20
23
IO_1
-
I
(O)
Generic I/O.
13
IO_6
DAC1
I
(O)
Generic I/O. Alternately, hardware DAC channel 1.
14
VCC
-
I
Power supply input, +3.3 to +5.5 Vdc.
15
10
1,13,28
GND
-
-
Power supply and signal ground. Connect to the host
ground.
16
10
1,13,28
GND
-
-
Power supply and signal ground. Connect to the host
ground.
17
5
8
/RESET
-
I
Active low module hardware reset.
18
IO_3
ADC0
I
(O)
Generic I/O. Alternately, hardware ADC channel 0.
19
IO_4
ADC1
I
(O)
Generic I/O. Alternately, hardware ADC channel 1.
12