Table of Contents
Advertisement
Quick Links
Download this manual
See also:
User Manual
M23
GSM / GPRS Wireless Module
Design Guide
Rev. 0.1
December. 2003
COPYRIGHT BENQ Corporation
This document contains proprietary technical information which is the property of BenQ Corporation
and is issued in strict confidential and shall not be disclosed to others parties in whole or in parts
without written permission of BenQ Corporation
The documents contain information on a product, which is under development and is issued for cus-
tomer evaluation purposes only.
BENQ may make changes to product specifications at any time, without notice.
BenQ Corporation
Networking & Communications BG
18 JiHu Road, Nei-Hu, Taipei 114, Taiwan, R.O.C.
Tel: +886-2-2799-8800
Fax: +886-2-2656-6399
http://www.benq.com
©2003 BenQ Corporation
Confidential Property
1
M23 Design Guide
Version: 0.1 - 2003/12/12
Advertisement
Table of Contents
Related Manuals for BenQ M23
Summary of Contents for BenQ M23
- Page 1 December. 2003 COPYRIGHT BENQ Corporation This document contains proprietary technical information which is the property of BenQ Corporation and is issued in strict confidential and shall not be disclosed to others parties in whole or in parts without written permission of BenQ Corporation The documents contain information on a product, which is under development and is issued for cus- tomer evaluation purposes only.
-
Page 2: Table Of Contents
OVERVIEW ......................................3 DESIGN GUIDE ORGANIZATION ..............................4 PIN ASSIGNMENT OF M23 MODULE............................... 5 3.1. M23 M ODULE LACEMENT ..............................5 3.2. ROUND IN....................................5 3.3. VBATRF P 41~43) / VBATBB P ......................5 3.4. OWER ON SEQUENCE ................................6 3.5. -
Page 3: Overview
1. Overview This design guide is based mainly on the M23 evaluation board (EVB). The M23 EVB enables you to evaluate the M23 module and peripheral design. In addition, it provides sampling firmware that you can use as a starting point to develop code. To give the user a system concept of the interconnections between the host and M23 module, we first give a block diagram as The reference schematics for M23 peripherals will be given in details in this design guide. -
Page 4: Design Guide Organization
2. Design Guide Organization The rest of the manual is organized as follows: Section 3 Pin out definition of M23 module is given along with the RF antenna placement and trace guidelines. In addition, the recommended power on; and handshaking sequences are shown. -
Page 5: Pin Assignment Of M23 Module
3.2. Ground Pin There are 10 ground pins in M23 module, they should be connected together and routed to the common connection of the PCB ground plane (The ground plane in PCB should be as large as possible). -
Page 6: Power On Sequence
Power on sequence The pin POWON is dedicated to powering on the M23 module. The pin is initially HIGH when power is applied to the M23 module. Once the pin is pulled low for more than 120 ms, M23 will power on. - Page 7 UARTs and GPIOs of the host and module. This is done when the module power off. The AND gate in the above diagram can be implemented by the following schematics. ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12...
- Page 8 AND GATE OUTPUT, PWON, ROW4, IO11 Sequence ROW4 220K BGND NC7SZ08 BGND 100K IO11 BC817-40W BGND BGND ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12...
- Page 9 VCC=4V; M23 VBAT=4V IO11： reset status is input ROW4/wakeup：input pin pull high after trigger Note: The mechanism shows that after the PWON pin is pulled low, ROW4 becomes HIGH after 63ms. At the same time interval IO11 remains input status, since the resistor R3 pulls IO11 to low within the reset period, therefore BQ1 is kept open and pin 3 of BQ1 is kept high.
-
Page 10: The Handshaking Mechanism Between System (Host) And Module (Client)
Note: Based on Figure 1, assume the interrupt pin in system (Host) is low active, therefore if module needs to inform system via IO10, the module have to pull high IO10 a time interval to achieve this requirement, ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12... - Page 11 The above block diagram shows how the host system informs the module that a task requiring inter- action will be carried out. Note: The above procedure is exclusively used in hardware flow control configuration. ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12...
-
Page 12: Power On/Off Sequence Between System (Host) And Module (Client)
The above block diagram shows the power on sequence. First the host powers on and pulls Low PWON of the module for at least 120 ms. When the module is powered on, it sets IO10 will High 40 ~ 50 ms . ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12... - Page 13 Note : User can not try to power on module within 2000 ms after sending at$poweroff command to module ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12...
-
Page 14: Peripherals
The SIM Card digital interface in the M23 ensures the translation of logic levels between M23 and the SIM Card, for the transmission of 3 different signals: SIM_CLK; a reset signal from M23 to the SIM Card (SIM_RST); and serial data from M23 to the SIM Card (SIM_IO). The SIM card interface can be programmed to drive a 3V SIM Card. - Page 15 Voltage Gain = 2 with R60=3.3K Ear output Audio Path Selection AT Commands The M23 module provides the switching of audio paths using AT commands (In connection status): Default value: case (2) (1) at$aupath=3,0 (EARN, EARP, MICIN, MICIP, MICBIAS path OFF)
-
Page 16: Paging Indicator
Module LEDA <Value> LEDA is controlled through software program using a dedicated bit, which is built in the M23 module already. The LEDA pin status : a. When there is no voltage input, the LEDA is in high status. It means that the LED won’t be illuminated. -
Page 17: Acoustic Test (Dai Interface)
*Pin 28 is multipurpose function pin (switch by config JP5). In normal operation mode, it pin is function as GPIO1 (JP5 is setting as Case 1). In acoustic test mode, it pin is function as DAI interface (JP5 should be setting as Case Case1 Case2 ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12... -
Page 18: Io Mapping
IO mapping There have 6 IO pins available for M23 module. The function for these IO pins is List below. Description Reset Config IO 10 M23 (Client) wake up System (Host) Input Output / 0 IO 13 GPIO13 Output/1 Input... -
Page 19: Uart Interface
Note: The difference between Reset and Config in the pin definition table UART 2 Used for software debug. Pin Name Pin Out Pull Reset Config Description TXD2 Output/1 Transmit Data RXD2 Input Input Receive Data ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12... -
Page 20: Rs232 (Hw Flow Control)
(host side) and module (client side), there are two connections possible and are illustrated as follows: Option 1: HOST Device Option :2 External HOST Device Device Note: Since the DSR in M23 is PU 10K. ©2003 BenQ Corporation Confidential Property M23 Design Guide Version: 0.1 - 2003/12/12... - Page 21 Autobaud Rate Mechanism The M23 module UART is set at autobaud rate. This means when the M23 is powered on, it auto- matically detects the baud rate after the first AT command sent by the host. The baud rate is locked at...
-
Page 22: Power On/Off Concerns
The designer should be careful when there are different status between System (Host) and M23 module. In other words, if the System (Host) is powered on and the M23 module is powered off or vice versa, problems of current leakage will arise. Therefore, we make the following recommenda- tion to avoid the problem owing to the different status described as the following conditions between system (Host) and module (client). - Page 23 The System (Host) should give an AT command to the M23 module and when M23 receives power off command, M23 return ACK via UART to inform system (Host) that M23 is going to enter power-off status. When M23 is powered off , the switch between the System (Host) and M23 will be open to avoid the current leakage to be happened.
Need help?
Do you have a question about the M23 and is the answer not in the manual?
Questions and answers