SimCom SIM7020E - Power Saving Mode (PSM); Extended Mode DRX (E-DRX); Current Consumption

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SIM7020_Hardware_Design_V1.02 37 2018-07-25
5.3.4 Power Saving Mode (PSM)
SIM7030 module can enter into PSM for reducing its power consumption. The mode is similar to
power-off, but the module remains registered on the network and there is no need to re-attach or
re-establish the network connections. So in PSM all the functions will be unavailable except the RTC
function, module cannot immediately respond users’ requests.
In PSM, RTC_GPIO0 will change state from low to high if RTC_EINT receive interrupt event.
Either of the following methods will wake up the module from PSM:
 Pulling PWRKEY or RTC_EINT to low level will wake up the module.
 When the timer expires, the module will be automatically woken up.
Power domain of RTC_GPIO0 and RTC_EINT is VBAT, please consider the electrical
characteristics when connecting to external IO (suggest to use trigger as low-active).
Table 29: RTC_GPIO0/RTC_EINT characteristics
IO
Vih(min).
Vih(max).
Vil(min).
Vil(max).
VBAT
RTC_EINT
1.575
2.1 0 0.525 2.1(min)
RTC_EINT
2.725
3.6 0 0.905 3.6(max)
IO
Voh(min).
Voh(max).
Vol(min).
Vol(max).
VBAT
RTC_GPIO0
1.785
-
-
0.315
2.1(min)
RTC_GPIO0
3.085
-
-
0.545
3.6(max)
5.3.5 Extended Mode DRX (e-DRX)
In idle or sleep mode, module and the network may negotiate over non-access stratum signaling the
use of extended mode DRX for reducing power consumption.
5.4 Current Consumption
The current consumption is listed in the table below.
Table 30: Current consumption on VBAT Pins (VBAT=3.3V)
Sleep/Idle Mode
LTE supply current
(without USB connection)
Sleep mode Typical: 236uA (at+cfun=0)
Idle mode Typical: 5.6mA
Power Saving Mode
PSM supply current
PSM mode Typical: 3.4uA
eDRX