Power Saving Mode of PLS8-E | Telit Cinterion IoT Developer Community
June 22, 2017 - 8:26am, 2004 views
The datasheet of PLS8-E stated that there is a power saving mode of the module, which can be enabled by AT command
The Hardware Interface Description also stated that the typical rating of current consumption of SLEEP mode is around 2-5 mA.
I was measuring the current of the module only and got the result of about 20mA with Power Saving mode enabled.
Then I realized the USB is still connected after I send AT command via COM port. Therefore I have remove from PC and measure it again. However, the result is still 20mA.
It there some steps I have missed, thus the module cant gito SLEEP mode?
Could you describe how you measure the current?
You have disconnected the USB, and how about RS232?
How about the GNSS - maybe the supply voltage for the GNSS active antenna is on.
I was using a power monitor to act as a power source and data logger. This tool can simply tell me the power consumption of the whole system.
The tool is connected to where the module is suppose to get power from the power source (i.e. my device's battery). This is how I got the result of 20mA after it became stable.
Then I modify a USB cable connecting the BATT+, GND, USB_DP and USB_DM of the module respectively. I can then use terminal to send AT Command to the module.
I didn't use UART so RS232 may not be the issue.
About the GNSS, the setting are as below:
And even I set the Power/Antenna to OFF, the current is still 20mA.
Please advice. Thanks
And what hardware interfaces are used and connected? Maybe the module is being waken up by GPIO for example.
Here's the description how to measure the module's supply current taken from our documentation for multi adapter (maybe it's also worth trying):
The following procedure may be used to measure the supply current consumption:
• Cut the supply wire on the Multi-Adapter R1 as shown in Figure 5 and instead solder a 100mOhm 0805 resistor onto the pads connected by this wire. Now, the board is prepared to measure currents (100μV per 1mA) across this resistor.
Of course only if the USB interface is in suspended state or detached (VUSB_IN = 0) the module is able to switch into SLEEP mode.