Hardware Manual: emSTAMP- emSBC-Argon (Rev1)
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5.21
Power Supply
Supply
Direction
V
min
V
typ
V
max
Max. Current
V
IN
to module
4.75V
5.0V
5.25V
t.b.d
V
BAT
to module
1.2V
3.60V
10 µA
1)
+3V3
from module
3.3V
1000 mA
VDD_SD
from module
3.3V
350 mA
USBH_VBUS
from module
4.75V
5.0V
5.25V
500 mA
USB_OTG VBUS
to/from module 4.75V
5.0V
5.25V
500 mA
1)
RTC is on, LSE oscillator is on, Backup SRAM is off,
5.21.1
V
IN
Supply
The Module will be powered by a 5.0V supply. No additional supplies are required to use
the basic functionality of the module.
5.21.2
VBAT Supply
The VBAT power domain contains the RTC, the backup registers, the retention RAM and the backup
SRAM. Current consumption from the VBAT source (e.g. 3V lithium coin battery) with active RTC
and LSE oscillator is typically below 10µA at 25°C ambient temperature.
5.21.3
+3V3 Supply
The +3V3 is generated on the module and can be used on the by the peripheral on the carrier
board.
5.21.4
VDD_SD
VDD_SDMMC is the supply voltage for the SD-Card interface on the carrier board. It is internally
connected to +3V3.
5.21.5
USBH_VBUS
USBH_VBUS is the 5.0V VBUS-voltage which is generated on the PMIC of the module. It has a
current sense and provides over current protection at 600mA. USBH_VBUS can be directly
connected to a USB Type-A connector (ESD protection, e.g. TVS-diodes, has to be added on the
carrier board).
5.21.6
USB_OTG_VBUS
USB_OTG_VBUS is the 5.0V VBUS-voltage which is generated on the PMIC of the module. It has a
current sense and provides over current protection at 600mA.
Depending of the USB_OTG_HS_ID signal (PA10) the emSTAMP-Argon module enters the host or
the device mode:
In host mode USB_OTG_VBUS is turned on and can supply the connected device.
In device mode USB_OTH_VBUS is turned off. VBUS is supplied by the connected Host.