User's Manual

LoRa/BLE Modules
Hardware Integration Guide
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/wireless
12
© Copyright 2016 Laird. All Rights Reserved
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
the setup of internal pull-up/pull-down. Therefore, when I2C interface is selected, pull-up resistors on I2C SDA
and I2C SCL MUST be connected externally as per I2C standard.
UART_RX, UART_TX, UART_CTS are Vcc logic levels (if VCC is 3.3 V, i.e. SIO pin I/O levels track VCC). For example,
when RX and TX are idle, they sit at 3.3 V (if VCC is 3.3 V). Conversely, handshaking pins CTS and RTS at 0 V are
treated as assertions.
Pin 6 (nAutoRUN) is an input, with active low logic. In the development kit (DVK-RM1xx-SM) it is connected so
that the state is driven by the host’s DTR output line. The nAutoRUN pin must be externally held high or low to
select between the following two operating modes:
 Self-contained Run mode (nAutoRUN pin held at 0 V).
 Interactive / development mode (nAutoRUN pin held at VCC).
smartBASIC runtime engine firmware checks for the status of nAutoRUN during power-up or reset. If it is low
and if there is a smartBASIC application script named $autorun$, then the smartBASIC runtime engine FW
executes the application script automatically; hence the name Self-contained Run Mode.
Electrical Specifications
Absolute Maximum Ratings
Absolute maximum ratings for supply voltage and voltages on digital and analogue pins of the module are listed
below; exceeding these values causes permanent damage (Table 3).
Table 3: Maximum Current Ratings
Parameter
Minimum
Maximum
Unit
Voltage at VCC_BLE &
VCC_LORA pin
-0.3
+3.6 (Note 1)
V
Voltage at GND pin
0
V
Voltage at SIO pin
-0.3
VCC+0.3
V
Storage temperature
-40
+85
ºC
Note 1: Absolute Max Rating for VCC pin (max) is 3.6V, however we recommend 3.3V +/-5% as the spec for
maximum Vcc. The LoRa transmitter shuts down if the voltage exceeds 3.5V .
Recommended Operating Parameters
Table 4: Power Supply Operating Parameters
Parameter
Minimum
Typical
Maximum
Unit
VCC
1
1.8
3
3.5
V
VCC Maximum ripple or noise
2
10
mV
VCC rise time
TBD
mS
Operating Temperature Range
-40
-
+85
ºC
Note 1: Internal DCDC is used if VCC >2.1 V on power-up; otherwise internal LDO is used.
If supply voltage is greater than 3.5V, the LoRa transmitter will be disabled.
Note 2: The maximum VCC ripple or noise (at any frequency) that does not disturb the radio.