Murata Electronics North America DNT24 Manual Do Utilizador
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DNT24 Integration Guide – 03/04/15
7.
Set the IoPreDelay parameter as needed in Bank 6 to allow signals to stabilize following a mod-
ule wakeup event.
ule wakeup event.
8.
Set the AdcSkipCount parameter in Bank 6 as needed to allow internal transients in the ADC
sample-and-hold circuit to settle out. This parameter must be set to at least 3 when AdcDiffMode
is selected. Note that the IoPreDelay parameter discussed above provides a delay to allow sig-
nals external to the DNT24 to settle following a wake up event, while AdcSkipCount skips meas-
urements that may be distorted because the internal voltage on the ADC sample-and-hold has
not settled.
sample-and-hold circuit to settle out. This parameter must be set to at least 3 when AdcDiffMode
is selected. Note that the IoPreDelay parameter discussed above provides a delay to allow sig-
nals external to the DNT24 to settle following a wake up event, while AdcSkipCount skips meas-
urements that may be distorted because the internal voltage on the ADC sample-and-hold has
not settled.
9.
Select the DAC full scale reference by setting DacReference in Bank 6. This setting applies to
both DAC channels. The default is the ADC_EXT_REF input. If DAC operation is not needed, set-
ting this parameter to 0x03 will disable DAC operation, reducing current consumption.
both DAC channels. The default is the ADC_EXT_REF input. If DAC operation is not needed, set-
ting this parameter to 0x03 will disable DAC operation, reducing current consumption.
10. Configure the initial (power on) output level for DAC0 and DAC1 by loading the initial settings in
the Dac0Init and Dac1Init parameters respectively.
The ADC and DAC channels are factory calibrated. It may be desirable to fine tune these calibrations
after the DNT24 has been integrated with the customer’s hardware in some applications. For analog
calibration support, contact RFM technical support.
after the DNT24 has been integrated with the customer’s hardware in some applications. For analog
calibration support, contact RFM technical support.
5.5 Configuring I/O Event Reporting and I/O Binding
1.
Select the analog, digital and timing events that will trigger an I/O event report by setting the
respective bits in the IoReportTrigger parameter in Bank 6. The default is no triggers set.
respective bits in the IoReportTrigger parameter in Bank 6. The default is no triggers set.
2.
Configure the trigger behavior bits in the GpioEdgeTrigger parameter, Bank 6, for each GPIO
input selected to generate an I/O event report.
input selected to generate an I/O event report.
3.
For each ADC channel selected to generate an I/O event, set the high and low measurement
threshold values. The AdcThreshold parameters are in Bank 6. When the ADC is operating in dif-
ferential mode, the ADC1 to ADC0 differential measurement is compared to the “0” high and low
thresholds, and the ADC2 to ADC0 differential measurements is compared to the “1” high and low
thresholds. In this case the “2” threshold values are not used.
threshold values. The AdcThreshold parameters are in Bank 6. When the ADC is operating in dif-
ferential mode, the ADC1 to ADC0 differential measurement is compared to the “0” high and low
thresholds, and the ADC2 to ADC0 differential measurements is compared to the “1” high and low
thresholds. In this case the “2” threshold values are not used.
4.
If the periodic timer has been selected to generate an event report, load the required timer report
interval into the IoReportInterval parameter in Bank 6. The default timer interval is 30 seconds.
interval into the IoReportInterval parameter in Bank 6. The default timer interval is 30 seconds.
5.
Set the MaxQueuedEvents parameter in Bank 6 as needed to limit the number of Event Reports
that can be queued at one time by a DNT24. This parameter is used to prevent a router device
from clogging up its outbound queue with its own pending transmissions if it has having trouble
obtaining link or an available slot from its parent.
that can be queued at one time by a DNT24. This parameter is used to prevent a router device
from clogging up its outbound queue with its own pending transmissions if it has having trouble
obtaining link or an available slot from its parent.
6.
If I/O binding operation is desired, set the IoBindingEnable parameter in Bank 6 to 0x01.
I/O binding is disabled by default, and cannot be used when the ADC is operating in
differential mode.
I/O binding is disabled by default, and cannot be used when the ADC is operating in
differential mode.