HL7810 - Over consumption in Hibernate mode

IoT Modules Legacy HL Series
1

Hi,
I tested HL7810 on Eval board HL78-R3 and I have over consumption during hibernate mode after second being.

The last firmware version as been updated:
HL7810.5.7.2.0-24.10.0.FreeRTOS.w43
HL78xx.5.7.2.0.RK_03_02_00_00_43621_001.20241029
IMEI-SV: 3547205115610420
Legato RTOS: 24.10.0.FreeRTOS.w43 2024/09/18 16:49:33
atSwi: 24.10.0.FreeRTOS.w43
UBOOT: 01.03
Apps: RKAPP_03_02_00_00_42831_012__a9591ae8197c6856cd9bbe5e66be200d0d05acac
MAC: ALT1250_03_02_00_00_43621_FW
PHY: 12.50.329298
PMP: 329207
AISE: ISE2APP_00_00_00_09
SBUB: 1
SBFW: 1
FPuK1: 1B993663
FPuK2: 25DF28C5
RBUB: 0
RBFW: 0
MCU-Disable: 1

I removed jumpers CN1310, CN1308, CN1309 and CN1301 (pin1-2) as recommended in “3.1.4 Module Current Consumption Meas” chapter.

image
image828×230 35.6 KB

I connected a power supply OTTI ARC on CN804 and CN800 to measure the consumption.
USB cable is connected on UART1 connector.
I configured the hibernate mode with following command: “AT+KSLEEP=1,2,10”
=> read response “AT+KSLEEP?” => +KSLEEP: 1,2,10
I configured the PSM mode with following command: “AT+CPSMS=1”
=> read response “AT+CPSMS?” => +CPSMS: 1,“00101100”,“00001010”
The provided SIM with eval board is inserted in SIM connector.

The Eval board is powered off and WAKE UP switch on ON position

Here are the following actions done:

  1. Power up of OTTI ARC at 3.6V on CN804 and CN800
  2. Wait 30 seconds
  3. “AT+CFUN=0” command and next configure WAKE UP switch on OFF position (WAKEUP = 0) and consumption is around 2.72 µA as shown below:
    Hibernate_consumption_OK
    Hibernate_consumption_OK1679×996 37.8 KB
  4. WAKE UP switch on ON position
  5. command AT+CFUN=1
  6. wait around 14 seconds
  7. command AT+CFUN=0 and next configure WAKE UP switch on OFF position and the consumption is around 28.5 µA as shown as below:
    Hibernate_consumption_notOK
    Hibernate_consumption_notOK1680×998 38.7 KB

Can you help me to analyze this issue and understand how I can have always 2.8 µA consumpation each time the module goes to hibernate mode

Regards

2

are you going to measure the PSM mode hibernate current?
If yes, why are you sending AT+CFUN=0?

BTW, after you sending the AT+CPSMS to configure the T3324 and T3412 timing, you should wait for the network to return the actual timing:
e.g.


 AT+CPSMS=1,"11100000","11100000","00111001","00001010"

 OK
 +CEREG: 4,,,,,,"00001010","00111001"

Lastly, you can have a look on this application note about low power mode (Section “PSM Typical Use Case – Data Transmission Initiated by Host” ) :

3

Hello,

In this case I doesn’t test the PSM mode but hibernate mode.
I’m trying to test 2 cases :

  1. The module needs to be configured after first power-up during manufacturing process. Next we set it in hibernate mode.
  2. an unsuccessfull connection to the network due to a lack of network or out of range, that’s why I sent AT+CFUN=0 to stop the module and save battery.

As you said I will test the successfull case in the next step.

4

if you use AT+CFUN=0, why don’t you test the OFF mode of the module?

5

So I understand the command AT+CPWROFF and toggle off WAKE UP signal must be used in my case.

6

yes, according to specification, it is the OFF mode