Data Sheet
NINA-B41-data sheet
During standby mode, the module is clocked at 32.768 kHz, which is generated by an internal RC-
oscillator.
2.3.3.2Sleep mode
Sleep mode is the deepest power saving mode of NINA-B41 modules. During sleep mode, all
functionality is stopped to ensure minimum power consumption. The module needs an external
event in order to wake up from the sleep mode. The module always reboots after waking up from
the sleep mode.
When using the u-connectXpress software, the module can be manually switched on or off with
proper storage of the current settings using the UART DSR pin.
2.3.4Module reset
The NINA-B41 modules can be reset using one of the following ways:
• Low level on the RESET_N input pin, normally kept high using an internal pull-up. This causes
an “external” or “hardware” reset of the module. The current parameter settings are not saved
in the module’s non-volatile memory and a proper network detach is not performed.
• With the NINA-B41 modules, using the AT+CPWROFF command. This causes an “internal” or
“software” reset of the module. The current parameter settings are saved in the module’s non-
volatile memory.
2.3.5CPU and memory
The Nordic Semiconductor nRF52833 chip in the NINA-B41 series modules includes a powerful
Arm® Cortex®-M4 with FPU processor. The processor works with a superset of 16 and 32-bit
instructions (Thumb-2) at 64 MHz clock speed. It can use up to 37 interrupt vectors and 3 priority
bits.
The nRF52833 chip has 512 kB of flash and 128 kB of RAM for code and data storage.
2.4Low frequency clock
NINA-B41 modules require two clocks, a high frequency clock and a low frequency clock. The high
frequency clock is provided on-module by a high-accuracy 32 MHz crystal as required by the radio
operation. The low frequency clock can be provided externally by a 32.768 kHz crystal. An external
crystal provides the lowest power consumption and greatest accuracy. For information about the
LFXO operating parameters and performance of the clock, see Electrical specifications.
Note When using an external crystal with NINA modules at operating temperatures
above 85 ºC, certain limitations apply. For further information, see the Nordic nRF52833
specification for extended operating temperature.
2.5System interfaces
This section describes system interfaces that are supported in NINA-B41 modules. For additional
information, see the u-blox short range AT commands Manual [2] and u-connectXpress software
user guide [4].
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