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Neoway N21 Series User Manual
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N21
Hardware User Guide
Copyright © Neoway
T
echnology Co., Lt
d.
All right
s reserved.
20
3.4 RF Interface
Signal
Pin
I/O
Function
Remarks
ANT
22
AI/O
Antenna
50Ω impedance
3.4.1 Antenna Design
ANT of N21 require a characteristic impedance of 50 Ω.
Control the impedance of the traces
between
the
pins
and
antenna
to
ensure
the
RF
performance.
An
impedance
matching
circuit,
such
as
L
network, T
network, and pi network is mandatory in between. Pi network is recommended.
Fi
gu
re
3
-
16
L
ne
tw
or
k
ANT
N21
module
Z1
Z2
D1
Fi
gu
re
3
-
17
T
n
et
wo
rk
ANT
N21
module
Z1
Z2
D1
Z3
28
30
Table of Contents
Table of Contents
3
About this Document
8
Scope
8
Audience
8
Revision History
8
Symbols and Conventions
9
Related Documents
9
About N21
10
Product Overview
10
Block Diagram
10
Table 1-1 Variants and Bands
10
Basic Features
11
Figure 1-1 Block Diagram
11
Module Pins
13
Pad Layout
13
Figure 2-1 Pin Definition of N21
13
Pin Description
14
Table 2-1 IO Definition
14
Table 2-2 Pin Description
14
Application Interfaces
16
Power Supply
16
Vbat
16
Figure 3-1 Recommended Circuit Design 1
17
Figure 3-2 Recommended Schematic Design 2
18
Vddio_2P8
19
Control Interfaces
19
Pwrkey_N
19
Figure 3-3 Reference Design of Startup Controlled by Button
20
Figure 3-4 Reference Design of Startup Controlled by MCU
20
Figure 3-5 Reference Design of Automatic Start Once Powered up
20
Figure 3-6 Startup Timing
21
Reset_N
22
Figure 3-7 Shutdown Timing
22
Figure 3-8 Reset Controlled by Button
22
Peripheral Interfaces
23
Figure 3-9 Reset Circuit with Triode Separating
23
Figure 3-10 Reset Timing of N21
23
Uart
24
Figure 3-11 UART Connection
24
Figure 3-12 Recommended Level Shifting Circuit 1
25
Figure 3-13 Recommended Level Shifting Circuit 2
25
Usim
27
Figure 3-14 Recommended Level Shifting Circuit 3
27
Figure 3-15 Reference Design of USIM Card Interface
28
RF Interface
29
Antenna Design
29
Figure 3-16 L Network
29
Figure 3-17 T Network
29
Figure 3-18 Pi Network
30
Figure 3-19 Recommended RF PCB Design
30
Antenna Assembling
31
Figure 3-20 Specifications of MM9329-2700RA1
31
Figure 3-21 RF Connections
31
Other Interfaces
32
Wakeup
32
Net_Light
32
Figure 3-22 Reference Design of WAKEUP
32
Figure 3-23 Driving LED Directly
32
Status
33
Figure 3-24 Driving LED with a Triode
33
Electric Feature and Reliability
34
Nominal Values
34
Current Features
34
Table 4-1 Operating Conditions of N21
34
Table 4-2 Current Consumption of N21 (Typical)
34
Temperature Feature
35
ESD Protection
35
Table 4-3 Temperature Features of N21
35
Table 4-4 N21 ESD Protection
35
RF Features
36
Operating Bands
36
TX Power and RX Sensitivity
36
Table 5-1 Operating Bands of N21
36
Table 5-2 RF TX Power of N21
36
Table 5-3 RX Sensitivity of N21 Cat NB1
36
Mechanical Features
37
Dimensions
37
Label
37
Figure 6-1 N21 Dimensions (Unit: MM)
37
Package
38
Mounting N21 Onto Application Board
40
Bottom Dimensions
40
Application Foot Print
41
Stencil
41
Solder Paste
41
SMT Profile
42
Safety Recommendations
43
A Conformity and Compliance
44
Approvals
44
Chinese Notice
44
CCC Class a Digital Device Notice
44
Environmental Protection Notice
44
American Notice
44
Modify
45
FCC Class a Digital Device Notice
45
FCC Class B Digital Device Notice
45
B Abbreviation
46
4
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Neoway N21 Series Specifications
General
Brand
Neoway
Model
N21 Series
Category
Control Unit
Language
English
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