This technical brief discusses the interfacing and char- acterization of the Micro Crystal MS1V-T1K 32.768 kHz tuning fork (watch) crystal with the PIC16F690 PIC ® microcontroller Timer1 low-power oscillator. This infor- mation can be used to assist the designer in interfacing 32.768 kHz tuning fork crystal to the PIC16F690 MCU. The information in this technical brief is intended as a design suggestion. The designer should verify proper operation for their particular application. TB097 Interfacing a Micro Crystal MS1V-T1K 32.768 kHz Tuning Fork Crystal to a PIC16F690/SS Author: Steven Bible SCHEMATIC DIAGRAM Microchip Technology Inc. The schematic for the circuit is shown in Figure 1. The Stéphane De Boni tuning fork crystal resonator is connected to the Micro Crystal PIC16F690 OSC1 and OSC2 pins. Capacitors CD and CG are the load capacitors and resistor RD is the ……