Neoway N21 Series - Page 5

N21
Hardware User Guide
Copyright © Neoway Technology Co., Ltd. All rights reserved.
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Table of Figures
Figure 1-1 Block Diagram .................................................................................................................. 2
Figure 2-1 Pin definition of N21 .......................................................................................................... 4
Figure 3-1 Recommended circuit design 1 ........................................................................................ 8
Figure 3-2 Recommended schematic design 2 ................................................................................. 9
Figure 3-3 Reference design of startup controlled by button ............................................................ 11
Figure 3-4 Reference design of startup controlled by MCU .............................................................. 11
Figure 3-5 Reference design of automatic start once powered up ................................................... 11
Figure 3-6 Startup timing .................................................................................................................. 12
Figure 3-7 Shutdown timing ............................................................................................................. 13
Figure 3-8 Reset controlled by button .............................................................................................. 13
Figure 3-9 Reset circuit with triode separating ................................................................................. 14
Figure 3-10 Reset timing of N21 ...................................................................................................... 14
Figure 3-11 UART connection .......................................................................................................... 15
Figure 3-12 Recommended level shifting circuit 1 ........................................................................... 16
Figure 3-13 Recommended level shifting circuit 2 ........................................................................... 16
Figure 3-14 Recommended level shifting circuit 3 ........................................................................... 18
Figure 3-15 Reference design of USIM card interface ..................................................................... 19
Figure 3-16 L network ...................................................................................................................... 20
Figure 3-17 T network ...................................................................................................................... 20
Figure 3-18 Pi network ..................................................................................................................... 21
Figure 3-19 Recommended RF PCB design ................................................................................... 21
Figure 3-20 Specifications of MM9329-2700RA1 ............................................................................ 22
Figure 3-21 RF connections ............................................................................................................. 22
Figure 3-22 Reference design of WAKEUP ..................................................................................... 23
Figure 3-23 Driving LED directly ...................................................................................................... 23
Figure 3-24 Driving LED with a triode .............................................................................................. 24
Figure 6-1 N21 dimensions (Unit: mm) ............................................................................................ 28