====== Reverse engineering the SMA-Q2/SMA-Time smartwatch ======
by [[people:emeryth:start|emeryth]] (emeryth at hackerspace.pl)

{{:projects:hsyrenka.jpg?direct&500|}}

===== Intro =====
**SMA Q2** also known as **SMA TIME** is a Chinese smartwatch similar in design and features to the Pebble Time. \\
Featuring a color Memory LCD, heart rate sensor and a NRF52832 Bluetooth SoC to drive it all. \\

All the documents and interesting things are uploaded here: https://owncloud.hackerspace.pl/index.php/s/1bqTRwMI8XKXGKL

===== Hardware =====

==== Chips ====

^IC ^Description ^ Datasheet ^
|NRF52832-QFAAB0| Main SoC| |
|LP2985 (?)| 3.3V LDO for everything| |
|LP2985 (?)| 3.3V LDO for heart rate sensor module| |
|BQ24086 (?)| Battery charger| |
|KX022-1020 |3-Axis acccelerometer| |
|PAH8002|Heart rate sensor| |
|GD25Q16C (?)|16Mbit SPI flash| |
|LPM013M126A (?)|176x176 Japan Display Color memory LCD| |

==== MCU Pinout ====

^Pin ^Description ^
|P0.02 | LCD SCLK |
|P0.03 | LCD SI |
|P0.05 | LCD SCS |
|P0.06 | LCD EXTCOMIN |
|P0.07 | LCD DISP |
| | |
|P0.04 | Battery voltage measurement (x0.25 divider) |
| | |
|P0.08 | BACKLIGHT ON |
| | |
|P0.09 | BUTTON BACK |
|P0.27 | BUTTON UP |
|P0.28 | BUTTON OK |
|P0.29 | BUTTON DOWN |
| | |
|P0.11 | FLASH MISO |
|P0.12 | FLASH CS |
|P0.13 | FLASH MOSI |
|P0.14 | FLASH CLK |
| | |
|P0.25 | UART RX |
|P0.26 | UART TX |
| | |
|P0.30 | VIBRATOR ON |
| | |
|P0.15 | ACCEL INT ? |
|P0.16 | ACCEL POWER |
|P0.17 | ACCEL SDA |
|P0.18 | ACCEL SCL |
| | |
|P0.19 | HRM SDA |
|P0.20 | HRM SCL |
|P0.22 | HRM INT? |
|P0.10 | HRM RESET? |
|P0.31 | HRM POWER ON |