RIGADO R41Z-EVAL, Руководство пользователя

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R41Z-EVAL User Guide Rev 2.0
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6.1.1 R41Z Power Modes
The Rigado R41Z module contains a DC-DC converter that allows it to operate in a variety of power
environments. The R41Z Evaluation board supports all these operating modes, which are summarized
below:
R41Z DC-DC Converter Modes
Mode
Input
Voltage
Output
Voltage
Usage Notes
Bypass 1.71V – 3.6V N/A
DC-DC Converter is bypassed: Input voltage directly
supplies all internal module power rails. Suitable for
larger or non-battery powered applications that have
steady, regulated 3.3V or 1.8V power rails that power
multiple devices. Since the DC-DC converter is bypassed
in this mode, the R41Z cannot provide regulated power
to other devices.
Buck 1.8V – 4.2V 1.8V – 3.0V
1
DC-DC Converter operates in buck mode. Internal power
rails are sourced and regulated by the R41Z module. An
externally available power rail (V1P8) allows the R41Z to
supply regulated power to other peripheral devices.
Suitable for small applications powered directly from a
lithium ion battery
2
. If total power consumption is low,
the R41Z module can provide a regulated power rail to
supply other devices.
Boost 0.9V – 1.8V 1.8V – 3.0V 1
DC-DC Converter operates if boost mode. Internal power
rails are sourced and regulated by the R41Z module. An
externally available power rail (V1P8) allows the R41Z to
supply regulated power to other peripheral devices.
Suitable for small applications powered directly from a
low voltage battery
2 (For example, alkaline or NiMH). If
total power consumption is low, the R41Z module can
provide a regulated power rail to supply other devices.
Note 1: Output voltage is user adjustable in Buck and Boost mode. Defaults to 1.8V at Power On
Reset. In Buck mode, output voltage cannot be greater than input voltage.
Note 2: The R41Z does not include automatic battery management. Applications powered from
batteries must include battery management and protection features implemented with additional
hardware and/or software.
Table 2 – R41Z Power Modes