SH3001

SH3001 MicroBuddy™ Real-Time Clock and Clock Management Support IC for Microcontrollers SYSTEM MANAGEMENT Description The programmable SH3001 MicroBuddy™ (µBuddy™) provides mandatory microcontroller support functions: ♦ Clock Management System ♦ Real-Time Support ♦ Auxiliary functions Three components make a complete system: any microcontroller, the SH3001, and a bypass capacitor. This low-cost system would consume very little power and have clock-frequency accuracy of ± 0.5%. A fourth component, a 32.768 kHz crystal, raises the clock frequency accuracy to ± 0.0256% (± 256 ppm). The SH3001 can operate completely stand-alone, or under control of the microcontroller. A single-wire interface handles bi-directional communications. The SH3001 stores all configuration, calibration, parameters, and status information in a 36-byte bank of control registers. On reset, most of these are reloaded with defaults from the factory-set nonvolatile memory. The microcontroller can change any settings on the fly. If some of the settings must remain fixed, a comprehensive set of write-protect bits is provided for several related groups of registers (with both permanent write-inhibit and lock/unlock capabilities). A backup power source can also be connected to the SH3001. The IC can directly accommodate 2/3-cell zinccarbon/alkaline, 2/3-cell mercury, 2/3/4-cell NiCd/NiMH, 1cell Li/Li+ batteries, or a super cap. Features ♦ ♦ Highly integrated IC - 3 mm x 3 mm x 0.9 mm 16-lead MLP (QFN) package Clock Management System - Replaces high-frequency (HF) crystal or resonator - Programmable clock output from 32.768 kHz to 16 MHz - Speed shift between multiple clock frequencies - Adjustable spectrum spreading for EMI reduction - Directly supports microcontroller STOP function - Deep sleep with instantaneous auto-wakeup Real-Time Support - 179-year real-time clock, battery-backup capable - Dedicated 32.768 kHz buffered clock output - Built-in trim for 32.768 kHz oscillator to ± 4 ppm - Programmable periodic interrupt / wakeup timer Operates from 2.3 V to 5.5 V IDD