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WM620
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Manual
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WM620 Har
dware User Guide
Copyr
ight © Neoway
T
echnology
Co., Ltd
29
On the PCB, k
eep the RF si
g
nals and RF
components away
fro
m hi
gh
-speed circui
ts, power supplies,
transform
ers, great inductors, t
he clock circuit of single-
chip host, etc.
35
37
Table of Contents
Main Page
Default Chapter
4
Table of Contents
4
1 Introduction to WM620
8
Overview
8
Block Diagram
8
Specifications
9
Table 1-1 WM620 Specifications
9
2 Pin Description and PCB Foot Print
11
Specifications
11
Figure 2-1 Bottom View of the WM620 Module
11
Pin Definition
12
Table 2-1 WM620 Pin Definition
12
PCB Foot Print
14
Figure 2-2 PCB Foot Print Recommended for WM620 (Unit: MM)
14
3 Interface Design
15
Power Supply and Switch Interfaces
15
Vbat
15
Table 3-1 Power Supply and Switch Interface
15
Figure 3-1 Current Peaks and Voltage Drops
16
Figure 3-2 Power Supply Design
16
Figure 3-3 Reference Design of Power Supply Controlled by MIC29302
17
Figure 3-4 Reference Design of Power Supply Controlled by P-MOSFET
17
Vrtc
18
Figure 3-5 RTC Reference Design
18
VDD
19
ON_OFF Pin and Power-On Procedure
19
Table 3-2 Capacity Matching Power Failure Duration
19
Figure 3-6 Reference Circuit of ON_OFF Controlled by High Level
20
Figure 3-7 Power-On Procedure
20
Reset
21
Figure 3-8 Reset Circuit
21
Running Status Indication
22
LED Indicator
22
Table 3-3 LED Indicator
22
Table 3-4 Network Status Indication (A)
22
Table 3-5 Network Status Indication (B)
22
RING Pin
23
Figure 3-9 Reference Circuit of LED Indicator
23
Figure 3-10 Circuit for Brighter LED
23
Figure 3-11 RING Indicator for Incoming Call
23
Figure 3-12 RING Indicator for SMS
23
USIM Card Interface
24
Figure 3-13 Reference Design of USIM Card Interface
24
Table 3-6 SIM Card Interface
24
Figure 3-14 Recommended ESD Diode Array
25
Figure 3-15 Reference of SIM Card Socket
25
USB Interfaces
26
Figure 3-16 Reference USB Circuit
26
Table 3-7 USB Interface
26
Uart
27
Basic Descriptions of UART
27
Figure 3-17 Signal Connection between DCE and DTE
27
Table 3-8 UART
27
Level Shifting for UART
28
Figure 3-18 Recommended Circuit between 3.3V MCU and UART
28
Sleep Mode
29
Figure 3-19 Recommended Circuit between 5V MCU and UART
29
Figure 3-20 Sleep Mode Controlled by UART
30
UART Control
30
USB Control
30
Figure 3-21 Sleep Mode Controlled by USB (A)
31
Figure 3-22 Sleep Mode Controlled by USB (B)
31
Audio Interface
32
Figure 3-23 Reference Design of MIC Differential Connections
32
Table 3-9 Audio Interface
32
Figure 3-24 Reference Design of Single-End Input MIC Interface
33
Figure 3-25 Reference Design for Speaker Differential Output
33
Figure 3-26 Reference Design for Speaker Single-Ended Output
33
Table 3-10 MIC Voltage and Current
33
Adc
34
Table 3-11 EAR Parameter
34
Table 3-12 SPK Parameter
34
RF Interface
35
Figure 3-27 Reference Design for Antenna Interface
35
Figure 3-28 RF Layout Reference
35
4 RF Features
37
Work Band
37
Transmitting Power and Receiving Sensitivity
37
Transmitting Power
37
Receiving Sensitivity
37
Table 4-1 Work Band
37
Table 4-2 Transmitting Power (Unit: Dbm)
37
Table 4-3 Receiving Sensitivity (Unit: Dbm)
38
5 Electric Features and Reliability
39
Electric Feature
39
Temperature
39
Current
39
Table 5-1 Electric Feature of the Module
39
Table 5-2 Temperature Feature (Unit: º C)
39
Table 5-3 Operating Current (Unit: Ma)
39
ESD Protection
40
Table 5-4 Current in Sleep Mode
40
Table 5-5 ESD Feature of the Module
40
6 Typical Circuits
41
7 Mounting the Module Onto the Application Board
43
8 Package
44
9 Abbreviations
45
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