User Manual
Table Of Contents
- About the ConnectCore® 6UL
- Module specifications
- Assembly instructions
- Moisture sensitivity and shelf life
- Mounting
- Solder paste print
- Stencil
- Coplanarity
- SMT pick and place
- SMT process parameter reference - for both castellation and LGA applications
- Reflow profiles using a ten-zone oven, SAC 305 lead-free solder paste (Alpha ...
- Vapor Phase Profile Recommendation Using IBL 309 Batch Soldering Machine, SAC...
- Vapor Phase IBL 309 batch soldering machine settings
- Conformal coating
- Certifications
About the ConnectCore® 6UL Micro Controller Assist™
ConnectCore® 6UL Hardware Reference Manual
28
External voltage reference
The MCA_IO2/EXT_VREF pin provides an accurate voltage reference of 1.2V that can be used to
provide a reference voltage for sensors and/or analog devices (such as comparators or DACs).
When this pin is used as external reference voltage or as the internal reference of the MCA analog-to-
digital converter,an external capacitor of 100nF must be connectedbetween the pin and ground and
as close as possible to the module pad.
The default configuration of the MCA_IO2/EXT_VREF pin is as IO. You must use software to configure
the pin for external voltage reference. See the software documentation for additional information
about how to control the function of this pin.
Note that the voltage reference continues normal operation in low power modes (suspend and power
off). Therefore, if the voltage reference is enabled during normal operation but is not required for low
power operation, Digi recommends using the software to disable it before entering low power in order
to minimize the power consumption, and re-enable it when resuming normal operation.
External 32KHz clock output
The MCA_IO6/CLKOUT32K pin is a 32.768 Hz square wave output that can be used as clock input by
peripherals requiring a low-frequency, high-accuracy clock.
Note The default configuration of theMCA_IO6/CLKOUT32K pin is as IO. You must use software to
configure the pin as 32KHz clock output. See the MCAsoftware documentation for additional
information about how to control the function of this pin.
Note that the 32KHz clock output continues normal operation in low power modes (suspend and
power off). Therefore, if the 32KHz clock output is enabled during normal operation but is not required
for low power operation, Digi recommends using the software to disable it before entering low power
in order to minimize power consumption, and re-enable it when resuming normal operation.
Watchdog
The MCA implements a watchdog timer in its firmware. The MCA watchdog resets the system, or only
the i.MX6UL CPU, if the software running on the main processor fails to execute properly and does not
reset the watchdog timer on time.