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User’s Guide
SWRU321A
– May 2013
Page 17/32
6.3 Power Domains
The SmartRF06EB is divided into three power domains, described in detail in the following
sections. The SmartRF06EB components, and what power domain they belong to, is shown in
Figure 12 and Table 5 below.
XDS domain
(3.3 V)
XDS100v3, XDS LEDs
EM domain
(1.8 - 3.6 V)
ACC, ALS, keys, LEDs
3.3 V domain
(3.3 V)
LCD, SD card
Power sources
USB, batteries, external supply
Level
shifters
Level
shifters
Mounted EM
Figure 12
– Power domain overview of SmartRF06EB
Component
Power domain
Power source
Evaluation Module
EM domain (LO_VDD)
USB, battery, external
General Purpose LEDs
EM domain (LO_VDD)
USB, battery, external
Accelerometer
EM domain (LO_VDD)
USB, battery, external
Ambient Light Sensor
EM domain (LO_VDD)
USB, battery, external
Current
measurement
MSP
MCU
EM domain (LO_VDD)
USB, battery, external
LEDs
EM domain (LO_VDD)
USB, battery, external
XDS100v3 Emulator
XDS domain
USB
XDS100v3 LEDs
XDS domain
USB
SD Card Slot
3.3 V domain (HI_VDD)
Same as EM domain
LCD
3.3 V domain (HI_VDD)
Same as EM domain
Table 5
– Power domain overview of SmartRF06EB
6.3.1 XDS Domain
The XDS100v3 Emulator (see section 6.1) onboard the SmartRF06EB is in the XDS domain. The
XDS domain is powered over USB. The USB voltage supply (+5 V) is down-converted to +3.3 V
and +1.5 V for the different components of the XDS100v3 Emulator.
The SmartRF06EB must be connected to e.g. a PC over USB for the XDS domain to be powered
up. The domain is turned on/off by the SmartRF06EB main power switch.
6.3.2 EM Domain
The mounted EM board and most of the SmartRF06EB peripherals are powered in the EM
domain and signals in this domain (accessible by the EM),
are prefixed “LV_” in the schematics.
Table 5 lists the EB peripherals that are powered in the EM domain. The domain is turned on/off
by the SmartRF06EB power switch.
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