RIGADO R41Z-EVAL, Руководство пользователя

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R41Z-EVAL User Guide Rev 2.0
10
6.1 Power
The R41Z Evaluation Board has three possible power sources: USB, a CR2032 coil cell, and a 0.1”
through-hole connector. These sources are OR’d together with protection diodes to prevent reverse
voltage to any supply. These allows for more than one source to be connected at a time. For example,
a coil cell battery may remain connected to the board while the board is being debugged with the USB
source connected. However, since the diodes do cause approximately a 0.3V drop in source voltage,
there is the option to bypass the diodes via solder jumpers. Care should be taken to not damage the
supplies or Evaluation board when the protection is by-passed.
If necessary, the LDO regulator can be disabled in order to allow for USB based debugging while
powering the R41Z from either an external source or a coil cell. Since the R41Z can accept a wide
range of power options, the LDO regulator can be adjusted to simulate some sources. For details on
these options, see Power Configuration Switch section later in this document.
Figure 16 – Schematic: Power Supply