Revision History - Quectel M12 Hardware Design

M12 Hardware Design

0. Revision history

Revision Date
1.0 2010-07-20 Yong AN
1.1 2010-11-30 Yong AN
3.0 2012-02-14 Layne YE
3.1 2012-03-15 Layne YE
3.2 2012-04-16 Layne YE
3.3 2012-09-20 Layne YE
M12_Hardware_Design_V3.3
Author Description of change
Initial
Added Chapter 4.5 for RF pad welding.
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.
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.
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.
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.
- 7 -