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DS1672 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1672 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page DS1672 8 of 15 DETAILED DESCRIPTION The DS1672 provides a 32-bit counter that increments once-per-second. The counter data is accessible via an I2C serial interface. A precision, temperature-compensated, voltage reference and comparator circuit monitors VCC. When VCC drops below VPF, RST becomes active and the interface is disabled to prevent data corruption. The device switches to the backup supply input, which maintains oscillator and counter operation while VCC is absent. When VCC rises above VPF, RST remains low for a period of time (tRPU) to allow VCC to stabilize. The block diagram in Figure 4 shows the main elements of the DS1672. As shown, communications to and from the DS1672 occur serially over a I2C, bidirectional bus. The DS1672 operates as a slave device on the I2C bus. Access is obtained by implementing a START condition and providing a device identification code followed by a register address. Subsequent registers can be accessed sequentially until a STOP condition is executed. Figure 4. Block Diagram Oscillator Circuit The DS1672 uses an external 32.768kHz crystal. The oscillator circuit does not require any external resistors or capacitors to operate. Table 1 specifies several crystal parameters for the external crystal. Figure 4 shows a functional schematic of the oscillator circuit. If using a crystal with the specified characteristics, the startup time is usually less than one second. Table 1. Crystal Specifications* PARAMETER SYMBOL MIN TYP MAX UNITS Nominal Frequency fO 32.768 kHz Series Resistance ESR 45 k Ω Load Capacitance CL 6 pF *The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks. 32-BIT COUNTER (4 BYTES) I2C INTERFACE POWER CONTROL ADDRESS REGISTER CONTROL LOGIC 1Hz V CC V BACKUP GND SCL SDA CONTROL TRICKLE CHARGER X1 X2 RST Dallas Semiconductor DS1672 C L C L N OSCILLATOR AND DIVIDER |
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