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Hi Tony
The chip has an output pin of 1.8 volts used mainly for level shifting which i use.
I think the sim7600e has a firmware issue. The circuit performs well with a different 7600e chip so im convinced this is the issue.
Ive searched for pc software that will allow me to reflash the 7600...
Hi Klaus, thanks for your reply
this circuit works fine with a different SIM7600E chip, so i doubt its the circuit.
problem is the 1.8v output voltage i use for level shifting on the uart to esp32 is oscillating, there is no status led on, therefore chip isnt active, no comms between sim7600...
dear forum
i have designed a circuit using the 7600e with an ESp32 processor
the 1.8v output on the 7600 is oscillating at 1.695 Hz, with an on time of 534mS and off time of 62mS, this also applys to the I2Cclock and the PCM data pins
these 10 SIM7600e's that ive bought differ in P/N numbers...
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