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 to the prototype i already have working OK, excactly the same circuit but different chips
can anyone please advise on the fault
many thanks
Tony
But if you want us to review your circuit, you need to show us your circuit. Schematic, photos (100kby each), PCB layout.
And a clear error description:
* test conditions
* expectation
* what´s not like expected
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 and esp32.
im wondering if the sim7600e has different firmware in it, or corrupt firmware
see attached schematic and layout
many thanks
tony
I'm sure there must be an English version or I can translate it in my browser extension, if you need it. There are some Japanese tools in English , I recall.
SIMCom SIM7600E is Multi-Band LTE-TDD/LTE-FDD module solution in a mPCIe form factor. SIM7600E is a LTE CAT-1 module with support of up to 10Mbps downlink data transfer.