GPIO21GPIO32REFM3REFP4+VA5AGND6MXO7AINP8AINM9AGND10CH1511CH1412CH1313CH1214CH1115CH1016CH917CH818AGND19AGND20CH721CH622CH523CH424CH325CH226CH127CH028+VA29AGND30CS#31SCLK32SDI33SDO34BDGND35+VBD36GPIO037GPIO138