Specifications

M12 Hardware Design
M12_HD_V3.3 - 7 -
0. Revision history
Revision
Date
Author
Description of change
1.0
2010-07-20
Yong AN
Initial
1.1
2010-11-30
Yong AN
Added Chapter 4.5 for RF pad welding.
3.0
2012-02-14
Layne YE
1. Modified the power supply range.
2. Modified buzzer interface as RESERVED.
3. Modified the display interface as SD interface.
4. Modified the peak current in a transmitting burst.
5. Modified the current consumption in GSM talk
mode and GPRS communication mode.
6. Modified the RF receiving sensitivity.
3.1
2012-03-15
Layne YE
1. Deleted the content of charging function.
2. Modified the current consumption in GSM talk
mode and GPRS communication mode.
3. Disabled the module hardware flow control
status by default.
3.2
2012-04-16
Layne YE
1. Deleted the alarm function and relevant AT
Commands.
2. Deleted the function content of keyboard pins.
3. Deleted the function content of Light_MOS pin.
4. Deleted the FAX function.
5. Deleted the echo cancellation function.
6. Modified the keyboard pins as RESERVED.
7. Modified the name of GPIO1_KBC5 pin to
GPIO1.
3.3
2012-09-20
Layne YE
1. Updated the module functional diagram.
2. Modified the DC characteristics of VRTC.
3. Updated the voltage drop during burst emission.
4. Updated the SIM card reference circuit.
5. Modified the level match reference circuits for 5V
peripheral system.
6. Modified the maximum trace length of SD card
signals and the maximum trace difference.
7. The AOUT1 audio channel suppored voice and
audio output and so on.
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