User's Manual

Bluegiga Technologies Oy
Page 22 of 52
8 Clock Generation
BT111 is using an internal 26 MHz crystal oscillator. All internal digital clocks are generated using a phase
locked loop, which is locked to the 26 MHz crystal oscillator. 26 MHz clock is calibrated in production and the
calibrated settings are stored to the internal EEPROM of BT111. The 32.768 kHz sleep clock is generated
internally to the module. BT111 does not need any external clock sources.