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DSB75 Development Support Board Rev. B1 Hardware Description
Strictly confidential / Released
s
DSB75_hd_v08 Page 32 of 94 29.09.2005
3.5.2 Serial Interface 2 (COM2)
The 2
nd
serial interface COM2 (X202) of the DSB75 is intended for the communication
between the GSM module and the host application. This RS-232C interface includes only the
data lines RXD/TXD for transmitting GPRS data and AT commands, and the two control lines
RTS/CTS.
A level converter D201 adapts and inverts the V.24 signals (2.9V level) from the GSM
module to the RS-232C level.
The output lines are switched off (high impedance) if the GSM module is in POWER DOWN
mode. Therefore the PWR_IND signal is used to enable and shut down converters.
There are two alternative approaches to configure the ASC1 lines:
• as SD card interface (see section 3.10.2)
• as SPI interface (see section 3.10.3)
For using ASC1 lines at the test pins X101/X102 without a RS-232 level shifter, the switches
S300, S302, S304 and S306 have to be set to position 1.
Table 10: Pin assignment of 2
nd
serial interface COM2 (X202)
X202
pin
Name I/O Description X100
signal
name
Config.
switches
Remark
2 RXD O Receive Data RXD1 S302:3
S303:1
3 TXD I Transmit Data TXD1 S300:3
S301:1
5 GND - Ground GND
7 RTS I Request To Send RTS1 S304:3
S305:1
8 CTS O Clear To Send CTS1 S306:3
S307:1
1, 4,
6, 9
nc
nc= not connected
- Hardware Description 1
- Contents 3
- Figures 4
- 0 Document History 7
- 1 Introduction 11
- 1.3 Scope of Delivery 12
- 1.4 Terms and Abbreviations 12
- 2 General Overview 14
- 2.2 System Overview 16
- Adjustable Resistors 17
- 2.4 Block Diagram 18
- 2.5 Interface Overview 19
- 3.2 Test Points 23
- 3.3 GPIO Lines 25
- Figure 9: SIM card interface 27
- Figure 11: RS-232 interfaces 29
- Table 9: Pin assignment of 1 31
- 3.6.2.1 Recommended Headset 36
- Figure 18: DAI interface 39
- 3.9 I²C Interface 43
- Figure 23: I²C interface 44
- 3.10 SD Card Interface 46
- 11 10 8 7 6 5 4 3 2 1 9 47
- 3.10.1 SD 4 Bit Mode 48
- 3.10.2 SD 1 Bit Mode 49
- 3.10.3 SPI Bus Mode 50
- 3.12 Analog Interface 53
- 3.13 Antenna Interface 55
- C400,401,405 58
- X602 pin. Function 61
- 3.14.3.2 Charging Circuit 62
- GSM module 63
- 3.14.5 Adjusting the V 64
- 4 Status LEDs 65
- 4.3 Indication of Power 67
- 4.4 Indication of I²C Lines 67
- 5.1 Overview of Switches 68
- 5.2 Overview of Jumpers 73
- Figure 48: Turn on circuit 77
- 6.1.3 Emergency Restart 78
- 7 Technical Data of DSB75 79
- ~~~~~~~~~~~~~~~ 82
- 8 Appendix 83
- APPR'D 84
- NB = not mounted 87
- NB_ = not mounted 88
- 8.3 Floor Plan of the DSB75 93
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