M20 Hardware Design
2 Product concept
The M20 is a Quad-band GSM/GPRS engine that works at frequencies GSM850, EGSM 900
MHz, DCS 1800 MHz and PCS 1900 MHz. The M20 features GPRS multi-slot class 12(default)/
class 10/class8 and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. For more
detail about GPRS multi-slot classes and coding schemes, please refer to Appendix A and
Appendix B.
With a tiny profile of 35mm x 32.5mm x 2.95mm, the module can meet almost all the
requirements for M2M applications, including Tracking and Tracing, Smart Metering, Wireless
POS, Security, Telematics, Remote Controlling, etc.
The M20 is a B2B connector type module, which can be embedded in customer applications
through its 50-pin connector. It provides all hardware interfaces between the module and
customer’s board.
z
Two serial ports can help to easily develop customer’s application.
z
Two audio channels include two microphone inputs and two speaker outputs. This can be
easily configured by AT command.
The module is designed with power saving technique so that the current consumption is as low as
1.1mA in SLEEP mode when DRX is 5.
The M20 is integrated with the Internet protocols; extended Internet service AT commands are
developed for customer to use the Internet services easily, which is very useful for those data
transfer applications.
The module is fully RoHS compliant to EU regulation.
2.1 Key features
Table 3: Module key features
Feature
Implementation
Power supply
Single supply voltage 3.4V – 4.5V
Power saving
Typical power consumption in SLEEP mode to 1.1 mA@ DRX=5
0.7 mA@ DRX=9
Frequency band
z
Quad-band: GSM850, EGSM 900, DCS1800, PCS1900
z
The module can search these frequency bands automatically
z
The frequency bands can be set by AT command
z
Compliant to GSM Phase 2/2+
Transmitting power
z
Class 4 (2W) at GSM 850 and EGSM 900
M20_HD_V1.01
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