S42
Hardware User Guide
1VV0301303 Rev. 11
Page 45 of 85
2021-05-06
Not Subject to NDA
5.5.
Power Consumption and Power-Down Modes
5.5.1.
Power Consumption S42/AI CEN FW
5.5.1.1.
Power Consumption S42/AI
The S42/AI uses a DC/DC converter for feeding the radio and CPU with 1,3V DC.
The DC/DC converter may be disabled and replaced by a linear regulator by the PMU
(Power Management Unit) if the current consumption is low. This further saves battery
power, because at low current consumption the DC/DC converter efficiency decreases,
because the influence of the switching losses increases.
The following values are typical power consumption values in the different states.
VSUP = 3,0V, Tamb = 25°C, all GPIOs open, UART inputs at VSUP or GND, SLCK: 32,768 kHz
Condition
Radio inactive
Note
Slow clock
SLCK
Current
Consumption
Unit
IAvg
Advertising Off, UICP not active
or serial interface up
internal
Crystal
1,2
1,3
mA
Advertising Off, UICP active,
serial interface down
(1)
internal
Crystal
9,1
8,0
µA
Device in reset
(2)
any
0,44
mA
System off / wake-up RESET
(1,2,3)
0,3
µA
System off / wake-up GPIO
(1,2,3)
0,3
µA
(1)
UART-RXD, IUR-IN# and UART-CTS# signals connected to CMOS high level
(2)
same current consumption w. internal or external slow clock
(3)
If UICP was disabled before AT+SYSTEMOFF, keep UART-CTS# at logic low
or leave it floating
Table 19: Supply Current Sleep Modes, no Radio Activity
