Matrix user forums

Has anybody used GSM SIM7600CE?

SIM7600 models

7600A-H: no GSM, North America
7600V-H: no GSM, North America
7600E-H: GSME, Europe, SouthEast Asia, West Asia, Africa, China, South Korea
7600SA-H: GSM, Australia, New Zealand, Taiwan, Latin America
7600G-H(R2) Global, GSM
7600CE-JT1S,7600CE-CNSE,7600CE-T, GSM, China, some South East countries

Hi

Sim7600 UART connection

SIM7600 Series_Hardware Design_V1.04 documents tells user to pay attention to Sim7600 module Rx,Tx pins voltage (1.8v).
There are a lot of level shifters for 5v to 3.3v design.
Sim7600 document suggest to use high speed transistors such as MMBT3904 to connect Sim7600 to 5v MC.
However such a small transistor (Surface Mount) hard to solder in a simple DIY setup.

Question
Is it possible to use the low voltage high speed npn through-hole transistor?
What would be the best one to use for low voltage high speed design?
Thank you.

Hi

The 2N3904 is an equivalent Through Hole and is in plentiful supply.

Regards

Hi
Thank you
Will download the manual

Hi

Why not use a module such as :-

sparkfun-logic-level-converter-bi-directional

available from all the usual suspects. This can go down to 1.8v and is very easy to use. Just connect your High and Low voltages (+5v and +1.8v), Ground and then your pins.

Regards

Hi
I have some.
3.3v to 5v.
I couldn't find the 1.8v to 5v modules.
What is the module you are referring to?

Hi

From Amazon, but available from many sources including mainstream

https://www.amazon.co.uk/SparkFun-BOB-1 ... rch&sr=8-3

Circuit simulation using the MOSFETs used in the above confirms 1.8v - 5v operation.

Depending on the transistors used in the convertors you already have they may well work down at 1.8v too. Worth trying.

Regards

A-a-a...
Understood. The red pcb module.
I have it.
Will try...
Thanks