ADUCM3029BCBZ-R7 datasheet(27/39 Pages) AD

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Data Sheet

ADuCM3027/ADuCM3029

Rev. B | Page 27 of 39

The main features of the ADC subsystem include the following:



12-bit resolution.



Programmable ADC update rate from 10 KSPS to



1.8 MSPS.



Integrated input multiplexer that supports up to eight

channels.



Temperature sensing support.



Battery monitoring support.



Software selectable on-chip reference voltage generation—

1.25 V and 2.5 V.



Software selectable internal or external reference.



Autocycle mode—ability to automatically select a sequence

of input channels for conversion.



Averaging function—converted data on single-channel or

multiple channels can be averaged up to 256 samples.



Alert function—internal digital comparator for

ADC0_VIN0, ADC0_VIN1, ADC0_VIN2, and

ADC0_VIN3 channels. An interrupt is generated if the

digital comparator detects an ADC result above or below a

user defined threshold.



Dedicated DMA channel support.



Each channel, including temperature sensor and battery

monitoring, has a data register for conversion result.

Clocking

The ADuCM3027/ADuCM3029 MCUs have the following

clocking options:



26 MHz



Internal oscillator—HFOSC (26 MHz)



External crystal oscillator—HFXTAL (26 MHz or

16 MHz)



GPIO clock in—SYS_CLKIN



32 kHz



Internal oscillator—LFOSC



External crystal oscillator—LFXTAL

The clock options have software configurability with the

following exceptions:



HFOSC cannot be disabled when using an internal buck

regulator.



LFOSC cannot be disabled even if using LFXTAL.

Table 23. RTC Features

Features

RTC0

RTC1 (FLEX_RTC)

Resolution of

Time Base

(Prescaling)

Counts time at 1 Hz in units of seconds. Operationally,

RTC0 always prescales to 1 Hz (for example, divide by

32,768) and always counts real time in units of

seconds.

Can prescale the clock by any power of two from 0 to 15. It can

count time in units of any of these 16 possible prescale settings.

For example, the clock can be prescaled by 1, 2, 4, 8, …, 16,384, or

32,768.

Source Clock

LFXTAL.

Depending on the low frequency multiplexer (LFMUX)

configuration, the RTC is clocked by the LFXTAL or the LFOSC.

Wake-Up

Timer

Wake-up time is specified in units of seconds.

Supports alarm times down to a resolution of 30.52 μs, that is,

where the time is specified down to a specific 32 kHz clock cycle.

Number of

Alarms

One alarm only. Uses an absolute, nonrepeating

alarm time, specified in units of 1 sec.

Two alarms. One absolute alarm time and one periodic alarm,

repeating every 60 prescaled time units.

SensorStrobe

Mechanism

Not available.

SensorStrobe is an alarm mechanism in the RTC that sends an

output pulse via GPIOs to an external device to instruct the device

to take a measurement or perform some action at a specific time.

SensorStrobe events are schedule data specific target time

relative to the real-time count of the RTC. SensorStrobe can be

enabled in active, Flexi, and hibernate modes.

Input Capture

Not available.

Input capture takes a snapshot of the RTC when an external

device signals an event via a transition on one of the GPIO inputs

to the ADuCM3027/ADuCM3029. Typically, an input-capture

event is triggered by an autonomous measurement or action on

such a device, which then signals to the ADuCM3027/

ADuCM3029 that the RTC must take a snapshot of time

corresponding to the event. Taking the snapshot can wake up the

ADuCM3027/ADuCM3029 and cause an interrupt to the CPU. The

CPU can subsequently obtain information from the RTC on the

exact 32 kHz cycle on which the input capture event occurred.

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