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. A fourth component, a 32.768 kHz crystal, raises the clock frequency accuracy to ± 0.0256% (± 256 ppm). 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.
Semtech Corporation
