SmolPhone Device
At a glance the SmolPhone Device consists of a display, a keypad, a board with a microcontroller, and a LTE-M modem.
The display is a Sharp memory LCD LS027B7DH01.
This is a 400x240 monochrome reflexive LCD with very low energy consumption.
The keypad is a TCA8418 50-key matrix.
The board is a PICO2-XXL.
It features a RP2350B which includes two 150 MHz ARM Cortex-M33,
520 kB of memory, 16 MB of flash storage, and a micro SD-card slot.
The LTE-M modem is a nRF9151 from Nordic Semiconductor.
The modem provides a 64 MHz ARM Cortex-M33 processor, 256 kB of memory, and 1 MB of flash storage for the user.
The Figure 1 provides a high-level overview of how these components are connected to each other. The Figure 2 shows a photo of the current device.
Figure 1: Device overview.
Figure 2: The SmolPhone device.