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MAX32600 User’s Guide
Analog Front End
8.4 DAC
In order to generate output voltages using the DAC, there are several steps that must be completed. Initially, the DAC must be configured for the desired mode of
operation and certain options must be selected. Clocks and power settings/enables that are required for DAC operation must be set as well. Certain settings and
options are selected once for all DACs in the system (common DAC configuration settings), while other settings and options are selected independently for each
DAC instance (individual DAC configuration settings); these are discussed separately below.
Once all configuration settings and other options have been selected, the DAC can be set to generate the desired output waveform. The procedure for doing so
varies depending on the needs of the application; the DAC can be set to generate either a static output voltage (which can be adjusted manually by the CPU or PMU
at any time), or the DAC can be set to generate a series of output voltage samples based on values that have been loaded into the DAC FIFO.
8.4.3.1
Common DAC Configuration Settings
Certain pre-operation steps (enabling/powering up modules/functions) and selection of common options must be completed before any of the DACs can be used.
Where these settings represent choices between multiple options, these apply to all four of the DAC instances.
Powering Up the Analog Front End
As with other operations/functions involving the analog front end on the
MAX32600
, the AFE must be globally powered up before any of the DACs can be used. This
is performed by setting
PWRMAN_PWR_RST_CTRL.afe_powered
to 1.
Configuring the Analog Matrix
For most applications, it will be necessary to configure the analog matrix to route DAC output signals as needed in combination with the on-board op-amps, SPST
switches, and other analog multiplexing options. This configuration is separate from DAC configuration, but it must be performed as needed before the DAC is used.
For more details on this topic, refer to the
DAC Voltage Reference Selection
Output voltages generated by the DACs are based on the currently selected common DAC voltage reference. This reference is selected for all DACs and must be
selected before any DAC can be used. The DAC voltage reference is selectable between the two configurable voltage references V
ADC
and V
DAC
, which in turn can
be based on either an internal bandgap or external reference level. Refer to the
for more information on this topic.
8.4.3.2
Individual DAC Configuration Settings
Once the
settings to all DACs have been configured, there are other individual settings for each DAC that must be set (on a per-instance basis) for each DAC
that will be used. These are detailed below.
Rev.1.3 April 2015
Maxim Integrated
Page 454
Содержание MAX32600
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