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| UART Communication between GSM and GPS |
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| Aankur:
I want to establish a UART Communication between GSM and GPS. The Supply Voltage of GPS is 3.3V. The Supply Voltage of GSM is 3.8V. The measured RX/TX Voltage Levels of GPS is 2.8V and 0V (for logic High and logic Low). The measured RX/TX Voltage Levels of GSM is 1.8V and 0V (for logic High and logic Low). Since there is a difference between RX/TX logic levels of the GSM and GPS, So I am not able to establish the UART Communication between GSM and GPS. I am using the interpreter of the telit GSM module to process the data of the GPS. I am not using any micro-controller to in between the GSM and GPS. Please suggest me a possible way to perform voltage (or Logic) level shifting. |
| tox3:
GSM modules usually has output with 1.8V (for example VAUX/PWRMON on Telit LE910), ypu could use it to power level shifter ic. Not sure about GPS module though. Specific part number would be helpful |
| mikerj:
Have a look at this TI app note. |
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