DESCRIPTION
Three components make a complete system: any microcontroller, the SH3003, and a bypass capacitor. A fourth component, a 32.768kHz crystal, raises the clock frequency accuracy to ± 0.0256% (± 256 ppm). A single-wire interface handles both bi-directional communications and the interrupt/wake-up signal from the SH3003. The SH3003 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 non-volatile 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 may also be connected to the SH3003. The IC can directly accommodate 2/3-cell zinccarbon/alkaline, 2/3-cell mercury, 2/3/4-cell NiCd/NiMH, one cell Li/Li+ batteries, or a super cap.
Semtech Corporation
