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AB18XX Datasheet(PDF) 3 Page - Abracon Corporation |
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AB18XX Datasheet(HTML) 3 Page - Abracon Corporation |
3 / 13 page AB18XX Series Real Time Clock Module Date of Issue: Sept. 10 th, 2012 3.0 x 3.0 mm ESD Sensitive Page (2) of (13) Abracon Drawing # Revision #: Initial Release 2. AB18XX Functional Description XT Osc RC Osc Divider Seconds Minutes Hours Days Weekdays Months Years Power Control VCC VBAT I2C/SPI Interface SCL SDA/O Control Alarms Int/Clock FOUT/nIRQ PSW/nIRQ2 VSS CLKOUT/nIRQ3 SDI nCE WDI Reset nEXTR nRST RAM XO XI nTIRQ Timer WDT 100ths Divider Calibration Engine EXTI Analog Compare The AB18XX serves as a companion part for host processors including microcontrollers, radios, and digital signal processors. It tracks time as in a typical RTC product and additionally provides unique power management functionality that makes it ideal for highly energy-constrained applications. To support such operation, the AB18XX includes 3 distinct feature groups: 1) baseline timekeeping features, 2) advanced timekeeping features, and 3) power management features. Functions from each feature group may be controlled via memory mapped registers. These registers are accessed using either an I 2C serial interface (e.g., in the AB1805) or a SPI serial interface (e.g., in the AB1815). Each feature group is described briefly below. The baseline timekeeping feature group supports the standard 32 kHz crystal (XT) oscillation mode for maximum frequency accuracy with an ultra-low current draw of 55 nA. An extended calibration mode enables low jitter digital calibration to an accuracy of ±2 ppm over a range of -614 ppm to +244 ppm. The baseline timekeeping feature group also includes a standard set of counters monitoring hundredths of a second up through centuries. A complement of countdown timers and alarms may additionally be set to initiate interrupts or resets on several of the outputs. The advanced timekeeping feature group supports two additional oscillation modes: 1) RC oscillator mode, and 2) auto- calibration mode. At only 15 nA, the temperature-compensated ±10% RC oscillator mode provides an even lower current draw than the XT oscillator for applications with reduced frequency accuracy requirements. A proprietary calibration algorithm allows the AB18XX to digitally tune the RC oscillator frequency with accuracy as low as ±2 ppm at a given temperature and very low calibration jitter. In autocalibration mode, the RC oscillator is used as the primary oscillation source and is periodically calibrated against the XT oscillator. Autocalibration may be executed every autocalibration period (ACP) of 8.5 minutes or 17 minutes and may also be initiated via software. This mode enables average current draw of only 20 nA with frequency accuracy similar to the XT oscillator. The advanced timekeeping feature group also includes a rich set of input and output configuration options that enables the monitoring of external interrupts (e.g., pushbutton signals), the generation of clock outputs, and watchdog timer functionality. |
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