Strange behaviour of GPS module (Not working)

2 thoughts on “Strange behaviour of GPS module (Not working)

  1. Hi, my name is Christian, I work in the developed department in a company and I’m new in the forum. 
    The reason of this post is because we have an strange behaviour in a big number of equipments. This products use the SE867 module.
    All these equipment were working fine when were tested in the line production, but as time passed we observed this problem.
    We can separate the defective modules in two groups based in their behaviour, but maybe the origin of the problem it’s the same.
    1- Once the module are correctly powered and after a reset we can’t see data on the TX line.
    2-  Once the module are correctly powered and after a reset we see some strings of data in the TX line. In some modules we only see the first string with the version response and after this the module stops sending data.
    $PUNV,CFG_R,09,U.4.0.1-332,UBP_3.0,1511,0208,8135,10,0,2500,16369000*2F
    In other modules we can see a few packets more and after this the module stops sending data.
    $PUNV,CFG_R,09,U.4.0.1-332,UBP_3.0,1511,0208,8135,10,0,2500,16369000*2F
    $GPGGA,000000.000,3439.7654,S,05830.7869,W,0,00,50.0,54.34,M,0.00,M,,*62
    $GPGSA,A,1,,,,,,,,,,,,,,,*1E
    $GPRMC,000000.000,V,3439.7654,S,05830.7869,W,,,,,,N*7A
    $GPGSV,1,1,00,,,,*79
    In modules that work fine we observe a current of 40mA in the power line(V_GPS) that we use. We use the configuration 1 explained in the section 5.1.1 in the document SE867-AGPS User Guide, 1VV0300860 Rev. 5 – 2011-11-10, VDD_REG_IN=VIN=V_IO=V_GPS. In modules that not work fine we observe in some cases that the current rises to 48mA when starting time not to respond, or in other cases decrease to 26mA.
    I await your response. Best regards,
    Christian