# Microcontroller Unit-Based Wireless Sensor Network Nodes: A Review
## 4 Technical Discussion
### 4.1. Note Specifications and Applications
#### 4.1.2 Power Consumption  
The Atmega328P has six sleep modes of operation to minimize power consumption. The JN5139 microcontroller consumes as much current in the active state as the other MCUs reviewed in Tables 2 and 3. The CC430F5137 is capable of ultra-low power operation, since it consumes as little as 2.0 uA in standby mode (LPM3 RTC mode). \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Flatoms**} & \multicolumn{4}{c}{**CPU**} & \multicolumn{4}{c}{**Radio Transceiver**} & \multirow{2}{*}{**Tc Power**} & \multirow{2}{*}{**Applications**} \\ \cline{2-2} \cline{6-9}  & **Type** & **RAM** & **FLASH** & **EEPROM** & **Type** & **Freq** & **Range** & \\ \hline InfnInTime [18] & \begin{tabular}{c} MSR40F8909 \\ microcontroller \\ \end{tabular} & 64 kB (RFAM) & Not mentioned & Not mentioned & NME4R16E-R & 400 MHz & Not mentioned & Not mentioned & \begin{tabular}{c} Human trading and monitoring \\ \end{tabular} \\ \hline \multirow{2}{*}{MoieNet [20]} & Atmega32P & 2 kB (SRAM) & 32 kB & 1 kB and & \begin{tabular}{c} 1 kB and \\ 25 IC10/401 MHz \\ ESPROM \\ \end{tabular} & RFMR60 CW & \
\begin{tabular}{c} 431 MHz/ \\ 880 MHz \\ \end{tabular} & 80 m & Not mentioned &
\begin{tabular}{c} Underground soil \\ monitoring \\ \end{tabular} \\ \hline
[19] & Atmega32P & 2 kB & 32 kB & 1 kB & nR24R01 & 2.4 GHz & 250 m &
\begin{tabular}{c} -18, -12, 16 or \\ 0 dBm \\ \end{tabular} & Sports (monitoring \\ \hline
[21] & STMB21.126 MCU & 16 kB SRAM & 128 kB & 4 kB & MRF2400 &
\begin{tabular}{c} 2.49 GHz- \\ 2.475 GHz \\ \end{tabular} & Above 120 m & Not mentioned & Rural monitoring and \\ \hline
[37] & JNS139 & 96 kB RAM & Not mentioned & 192 kB ROM & \
\begin{tabular}{c} IEEE 802.15, \\ compliant \\ \end{tabular} & 2.4 GHz & Not mentioned & 3 dBm &
\begin{tabular}{c} 1200 detection, \\ SPIM and wireless \\ vibration control \\ \end{tabular} \\ \hline
[23] & Atmega32P-FU & 2 kB & 32 kB & 1 kB & \begin{tabular}{c} 1 kB and \\ transceiver from \\ Texas Instruments \\ \end{tabular} & \begin{tabular}{c} 300-348 MHz and \\ 799-288 MHz and \\ 779-298 MHz \\ \end{tabular} & Over 400 m & 12 dBm & \begin{tabular}{c} Agriculture \\ monitoring \\ \end{tabular} \\ \hline FROC [22] & Atmega32U & 2.5 kB & 32 kB & 1 kB EEPROM & \
\begin{tabular}{c} Xube-PROX \\ radio system \\ \end{tabular} & 902-928 MHz & 45 km LOS & 24 dBm &
\begin{tabular}{c} Smart cities and \\ smart farming \\ \end{tabular} \\ \hline
[31] & 64-bit Cortex-A53 & \begin{tabular}{c} 1 GB RAM \\ and up to 64 GB \\ disk storage. \\ \end{tabular} & Not mentioned & Not mentioned & \begin{tabular}{c} NME received \\ Mogenic cloud \\ \end{tabular} & Not mentioned & Not mentioned & \
\begin{tabular}{c} Automotive \\ \end{tabular} \\ \hline MEGAN [14] & Atmega32 APA & 2 kB SRAM & 32 kB & 1 kB EEPROM &
\begin{tabular}{c} Xube series \\ (1/Rooth) \\ (RC-G)/CDFs, \\ Wi-F/CSM \\ \end{tabular} & 2.4 GHz & Net mentioned & Not mentioned & Multiple IoT \\ \hline
[34] & ATmega88 & 1 kB SRAM & 8 kB & 512 kB & \
\begin{tabular}{c} 1 kB transducer \\ (0)/R2F2 (10) and \\ BL E transducer \\ (0)/R0100 m (RFM) \\ \end{tabular} & 2.4 GHz &
\begin{tabular}{c} 10-30 m (BLE), \\ 400-1000 m (RFM) \\ \end{tabular} & Not mentioned & IoT-based \\ \hline
[24] & ATmega1281 & 8 kB SRAM & 128 kB FLASH & 4 kB EEPROM & \
\begin{tabular}{c} Xube-51 Pro and \\ Xube-POULP \\ \end{tabular} & 2.4 GHz, 900 MHz & Not mentioned & Not mentioned &
\begin{tabular}{c} Environmental \\ monitoring and critical \\ event detection \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: A summary of features and applications of sensor nodes from recent research articles. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Flatroom**} & \multicolumn{4}{c}{**CPU**} & \multicolumn{4}{c}{**Radio Transceiver**} & \multirow{2}{*}{**Tr Power**} & \multirow{2}{*}{**Applications**} \\ \cline{2-2} \cline{6-9}  & **Type** & **RAM** & **FLASH** & **EEPROM** & **Type** & **Freq** & **Range** & \\ \hline \multirow{3}{*}{[22]} & MSP430F8969 &