Specifications

SIM7028 Hardware Design V1.00
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could wake up the system and restart the
core clock.
AT+ECPMUCFG=1,2
Sleep1
The module will shut down all the
peripherals and part of registers based
on the IDLE mode, the interrupt of the
peripherals cannot wake up the system.
AT+ECPMUCFG=1,3
Sleep2
The 256KB memory will be shut down
based on SLEEP1 mode, only 16KB
Retention Memory is kept.
AT+ECPMUCFG=1,4
Hibernate
The 16KB Retention Memory will be shut
down based on SLEEP2 mode.
The paging message cannot be received in SLEEP1 mode, SLEEP2 mode and Hibernate mode. When the
module needs to receive the paging message, it will switch to IDLE mode to receive the network paging
message, then switch back. The interrupt of the peripherals cannot wake up the system in SLEEP1 mode,
SLEEP2 mode and Hibernate mode. The module could be wake up by sending AT command of LPUART
function in UART1, and also pull down the pin of WAKEUP.
SLEEP1, SLEEP2, HIBERATE mode has difference with PSM mode. In the SLEEP1, SLEEP2, HIBERATE
mode, the system will shut down the internal power supply of module to reduce the power consumption.
When the communication with the networks is required, the module will switch to the IDLE mode. In PSM
mode, the module will enable the PSM function and the network send the timer of T3324 and T3412, the
module will enter the low power consumption when all the conditions are met.
4.2 PSM
The PSM function of SIM7028 could be opened by AT command “AT+CPSMS=1”, when the conditions are
met, the module will switch to PSM automatically. The module in PSM has low current(typically: 800nA).
PSM aims to reduce the power consumption of module and extend the power-on time of battery.
The following figure shows the power consumption of module in different mode:
Figure 16: Power consumption of module in different mode