EVK-ELLA-W1 - User Guide
UBX-15012877 - R04
Early Production Information
Board description
Page 8 of 24
3
Board description
This section describes the EVB-ELLA-W1 evaluation board and the available connectors and configuration
settings.
3.1
Block diagram
Figure 3: Block diagram of the EVB-ELLA-W1 evaluation board
3.2
Power supply
Different power supply options can be applied to the board using the dual-row pin header J5, which allows to
measure current and do performance tests under varying supply conditions. All the required voltages (3V3, 1V8
and VIO) can be supplied from the SDIO bus or from external power supplies. An on-board LDO can generate
1.8 V from a 3.3 V input. VIO voltage can be selected between 1.8 V and 3.3 V.
Table 4 lists the available power supply configuration options.
Be careful when configuring the power supply settings, as wrong configurations can cause
short circuits and damage the evaluation board and the host system.
Configuration setting (J5)
Power supply option
11-13 bridged
3V3 supplied from SDIO bus (default)
11-13 open external 3.3 V supply on 11-12
3V3 from external 3.3 V supply
9-10 bridged
5-6 bridged
1V8 supplied from on-board LDO (default)
9-10 open external 1.8 V supply on 5-6
1V8 from external 1.8 V supply
1-3 bridged
VIO voltage set to 3.3 V (default)
1-2 bridged
VIO voltage set to 1.8 V
Table 4: Power supply configuration options
