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| − | == Schematic ==
| + | #redirect [[category: SIMCOM]] |
| − | <gallery>
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| − | File:SIM908C-Schematic.png|SIM908C DIP Board
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| − | File:SIM908 R1.5 Schematic.png | SIM908 Mini Board R1.5 schematic
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| − | File:SIM908-R1.5 Pin definition.png | SIM908 Mini Board R1.5 board pins
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| − | </gallery>
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| − | Pin functions
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| − | * Pin RI: can indicate the incoming call with a TTL signal, this can also connect to a MCU port, it is connected to Net1 onboard LED too.
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| − | * Board provide VCHG battery charge pin: as well as a temperature check pin for battery, when a lithium battery attach between pin VCHG and GND, it will be charged by a provided 4.2 volt.
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| − | | |
| − | == SIM908 Dev. Board ==
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| − | Configuration
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| − | {| class="wikitable sortable"
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| − | |-
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| − | ! Name !! Description
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| − | |-
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| − | | SW101 || Power On/Off
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| − | |-
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| − | | GSM PORT || Serial （AT command input，GPRS data input）
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| − | |-
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| − | | GPS PORT || GPS debug test
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| − | |-
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| − | | LED D200 || Power indication LED
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| − | |-
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| − | | LED D201 || Working status indication LED
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| − | |-
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| − | | CN102 || USB Port
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| − | |-
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| − | | J103 || GSM Antenna Port
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| − | |-
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| − | | J100 || GPS Antenna Port
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| − | |}
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| − | | |
| − | Reference voltage test point
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| − | {| class="wikitable sortable"
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| − | |-
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| − | ! Reference voltage test point !! Voltage
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| − | |-
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| − | | Test Point 1 || 3.3V
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| − | |-
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| − | | Test Point 2 || 5.0V
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| − | |-
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| − | | Test Point 3 || 4.0V
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| − | |-
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| − | | Test Point 4 || 2.8V
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| − | |}
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| − | | |
| − | === SIM908 Mini Board ===
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| − | Status of On-board LEDs
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| − | {| class="wikitable sortable"
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| − | |-
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| − | ! Name !! Description
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| − | |-
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| − | | Net1 || connect to pin RI, keep off when power on, will light on when there is an incoming call
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| − | |-
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| − | | Pwr || Power status LED, keep constantly on
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| − | |-
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| − | | Net || inform the network status, quick blink when network not yet registered or problematic, keep slowly blink when network registered.
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| − | |}
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| − | Updates
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| − | * Version 1.1: * Change main power LDO, may have better performance * Add extra power pins and Uart pins * Fit into a case design.
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| − | * Version 1.2: Add extra logic leveled UART pins for arduino or Raspbery Pi such 5V or 3v3 devices
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| − | | |
| − | == Documents ==
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| − | [[File:Pins definition 908.jpg|thumbnail]]
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| − | * General IC info and pin definition
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| − | * [[:File:SIM908 Hardware Design V1.06.pdf|SIM908_Hardware Design_V1.06]]
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| − | * [[:File:Sim908.pdf|Sim908 General Specification]]
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| − | * [[:File:SIM908 AT Command Manual V1.02.pdf|SIM908 AT commands 1.02]]
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| − | | |
| − | * [http://www.cadsoftusa.com/downloads/file/sim908.lbr Eagle Library link]
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| − | * [[:File:SIM908-EVB-Schematics.pdf|SIM908 EVB Schematics]]
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| − | Video tutorial
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| − | * [https://www.youtube.com/watch?v=NGR7T-sSNxA Power by USB cable]
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| − | * [https://www.youtube.com/watch?v=g_VaXmIKPg4 Power and controlled by Arduino.]
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| − | | |
| − | | |
| − | | |
| − | [[category: SIMCOM]] | |
