SIM7600

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viktor_au
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SIM7600

Post by viktor_au »

Has anybody used GSM SIM7600CE?
Last edited by viktor_au on Sat May 28, 2022 5:02 am, edited 1 time in total.

viktor_au
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Re: SIM7600

Post by viktor_au »

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

viktor_au
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Re: SIM7600

Post by viktor_au »

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.
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chipfryer27
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Re: SIM7600

Post by chipfryer27 »

Hi

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

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viktor_au
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Re: SIM7600

Post by viktor_au »

Hi
Thank you
Will download the manual

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Re: SIM7600

Post by chipfryer27 »

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.

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viktor_au
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Re: SIM7600

Post by viktor_au »

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?

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Re: SIM7600

Post by chipfryer27 »

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.

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Re: SIM7600

Post by viktor_au »

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

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