GL865-DUAL SYSHALT

7 thoughts on “GL865-DUAL SYSHALT

  1.  

    Hi. 

     

    In documentation in section “5.2. Turning OFF the GL865” there is wrote that to turn off the device I have to disconnect the power from VBATT pin or VBATT and VBATT_PA pins to turn OFF the device.

    1. What will happen if I use SYSHALT command and power pin will be still powered?

    2. What will be power consumption after SYSHALT command?

    3. In http://www.telit.com/en/services/technical-forum/technical-forum.php?p_id=331&f_ac=thread&f_thread=38&suche=gpio i see that GPIO state is lost after power OFF the device, what will happen after SYSHALT command?

     

     

    1. Switched off power consumption numbers are presented in the dedicated paragraph/table "Power consumption" of Hardware User Guide.

      1. And more from my colleague:

         

        While the Power Amplifier on VBATT_PA (F2, F3 pins) can require about 2A peak current,
        the Operating current (GE865 radio transmission) on VBATT (F1 pin) is 200mA (peak) max.

        Moreover:
        Leakage current (GE865 off): F1 pin has 65uA typical (ambient temperature).
        Leakage current (GE865 off): F2 and F3 pins has 1uA typical (ambient temperature).

        IMPORTANT: VBATT_PA pins must be always supplied when VBATT is supplied.

         

        1. 1. with #SYSHALT the module is turned off. It can be awaken by reset pin, alarm or DTR pin transition to low.

          2. Answered by Cosmin

          3. GPIO status is not kept when the module is turned off.

          1. 3. GPIO status is not kept when the module is turned off.

             

            3.5.7.1.82. System turn-off 

             

             AT#SYSHALT[= , ,]

            The module is turned off. It can be awaken by reset pin, alarm or DTR pin transition to low.

            Parameters:

            :

            0 – GPIOs and serial ports pins are left unchanged (default)

            1 – GPIO and serial pins are set in input with pull down

            :

            0 – DTR has no effect on module turned off by SYSHALT (default)

            1 – DTR transition from high to low turns on again the module turned off by SYSHALT command

             

            So what is it ?

          2. Lukasz, you are right!

             

            With AT#SYSHALT=0,0 or 0,1 the GPIO status is kept as long as the module is OFF

             

            GPIO status is restored to input – tristate as soon as it is powered on again.

  2. Now I haven’t this module, so it is very important for me to know everything for PCB design where I will use python without external microcontroller.

     

    For clearence:

    If I use SYSHALT with  GPIO_restore = 1 all GPIO pins will be unchanged after module turn off.

    After power on by:

    • ALARM (after +CALA)
    • DTR change (DTR_wake_up = 1)
    • ON/OFF pin change (In modules with firmware where #SYSHALT is implemented and ON/OFF pin exists)

    all states of GPIO pins will be lost, direction will be INPUT-TRISTATE.

     

    BTW. You should change information about pins after power off, in few threads on forum.