Data Sheet

RM1xx LoRa/BLE Modules
Datasheet
https://connectivity.lairdtech.com/wireless-
modules/lorawan-solutions
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Table 14: I2C Power Consumption
Parameter Min Typ Max Unit
I2C Run current @ 100 kbps 380 uA
I2C Run current @ 400 kbps 400 uA
I2C Bit rate 100 400 kbps
Table 15: ADC Power Consumption
Parameter Min Typ Max Unit
ADC current during conversion 260 uA
For asynchronous interface like the UART (asynchronous as the other end can communicate at any time), the UART (on
RM1xx) must kept open (by a command in smartBASIC application script) resulting in the base current consumption penalty.
For synchronous interface like the I2C or SPI (since RM1xx side is the master), the interface can be closed and opened only
when needed (by a command in smart
BASIC application script), resulting in current saving (no base current consumption
penalty). There’s a similar argument for ADC (open ADC when needed).
4 FUNCTIONAL DESCRIPTION
The RM1xx module is a self-contained LoRa/Bluetooth Low Energy product and requires only power and a user’s
smartBASIC application to implement full LoRa and BLE functionality. The LoRa radio in conjunction with an externaltwo dBi
antenna implements a long range, low data rate connection to a LoRa gateway up to 15 kilometers. The integrated, high
performance BLE antenna combined with the RF and base-band circuitry provides the Bluetooth Low Energy wireless link to
connect to local BLE sensors. The RM1xx SIO lines provide the OEM’s chosen interface connection to the wired
serial/SPI/I2C/analog sensors. The user’s smartBASIC application binds the sensors to the LoRa and BLE wireless
functionality.
The variety of hardware interfaces and the smartBASIC programming language allow the RM1xx module to serve a wide
range of wired/wireless applications, whilst reducing overall time to market and the learning curve for developing LoRa and
BLE products.
To provide the widest scope for integration, a variety of physical host interfaces/sensors are provided. The major RM1xx
series module functional blocks are described below.
4.1 Power Management (includes brown-out and power on reset)
Power management features:
 System Standby Doze/Deep Sleep modes
 Brownout Reset
 Open/Close peripherals (UART, SPI, I2C, SIO’s and ADC). Peripherals consume current when open; each peripheral can
be individually closed to save power consumption (with a command in a smartBASIC application script).
 Two-region RAM retention (No RAM retention in Deep Sleep mode)
 smartBASIC command allows the VCC voltage to be read (through the internal ADC)
 Pin wake-up system from deep sleep
Power supply features:
 Supervisor hardware to manage power on reset, brownout (and power fail).
 1.8V to 3.5V supply range.