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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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