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DS3231M+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS3231M+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
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9 / 20 page  ±5ppm, I2C Real-Time Clock 9 High-Accuracy Time Base The temperature sensor, oscillator, and digital adjust- ment controller logic form the highly accurate time base. The controller reads the output of the on-board tempera- ture sensor and adjusts the final 1Hz output to maintain the required accuracy. The device is trimmed at the factory to maintain a tight accuracy over the operating temperature range. When the device is powered by VCC, the adjustment occurs once a second. When the device is powered by VBAT, the adjustment occurs once every 10s to conserve power. Adjusting the 1Hz time base less often does not affect the device’s long-term timekeeping accuracy. The device also contains an Aging Offset reg- ister that allows a constant offset (positive or negative) to be added to the factory-trimmed adjustment value. Power-Supply Configurations The DS3231M can be configured to operate on a single power supply (using either VCC or VBAT) or in a dual- supply configuration, which provides a backup supply source to keep the timekeeping circuits alive during absence of primary system power. Figure 4 illustrates a single-supply configuration using VCC only, with the VBAT input grounded. When VCC < VPF, the RST output is asserted (active low). Temperature conversions are executed once per second. Figure 5 illustrates a single-supply configuration using VBAT only, with the VCC input grounded. The RST output is disabled and is held at ground through the connection of the internal pullup resistor. Temperature conversions are executed once every 10s. Figure 6 illustrates a dual-supply configuration, using the VCC supply for normal system operation and the VBAT supply for backup power. In this configuration, the power-selection function is provided by a temperature- compensated voltage reference and a comparator circuit that monitors the VCC level. When VCC is greater than VPF, the device is powered by VCC. When VCC is less than VPF but greater than VBAT, the device is powered Figure 4. Single Supply (VCC Only) Figure 5. Single Supply (VBAT Only) Figure 6. Dual Power Supply Table 1. Power Control VBAT VCC +3.3V VBAT VCC VBAT VCC +3.3V CONFIGURATION CONDITION I/O ACTIVE I/O INACTIVE RST VCC Only (Figure 4) VCC > VPF ICCA ICCS Inactive (High) VCC < VPF Active (Low) VBAT Only (Figure 5) EOSC = 0 IBATA IBATT Disabled (Low) EOSC = 1 IBATDR Dual Supply (Figure 6) VCC > VPF ICCA ICCS Inactive (High) VCC < VPF VCC > VBAT ICCA VCC > VBAT ICCS Active (Low) VCC < VBAT IBATA VCC < VBAT IBATT |
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