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DS1672S-2 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1672S-2 Datasheet(HTML) 1 Page - Dallas Semiconductor |
1 / 13 page 1 of 13 082800 FEATURES 32-bit counter 2-wire serial interface Automatic power-fail detect and switch circuitry Power-fail reset output Low-voltage oscillator operation (1.3V min.) Trickle charge capability ORDERING INFORMATION DS1672X-X 2 2.0V operation 3 3.0V operation 33 3.3V operation blank 8-pin DIP S8-pin SOIC U 8-pin µSOP PIN ASSIGNMENT PIN DESCRIPTION VCC, VBACKUP - Power Supply Inputs GND - Ground X1, X2 - 32.768 kHz crystal pins SCL - Serial clock SDA - Serial data RST - Reset output DESCRIPTION The DS1672 incorporates a 32-bit counter and power monitoring functions. The 32-bit counter is designed to count seconds and can be used to derive time of day, week, month, month, and year by using a software algorithm. A precision temperature-compensated reference and comparator circuit monitors the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for 250 ms to allow the power supply and processor to stabilize. OPERATION The block diagram in Figure 1 shows the main elements of the DS1672. As shown, communications to and from the DS1672 occur serially over a 2-wire bi-directional bus. The DS1672 operates as a slave device on the serial 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. DS1672 Low Voltage Serial Timekeeping Chip PRELIMINARY 1 2 3 4 8 7 6 5 VCC RST SCL SDA X1 X2 VBACKUP GND |
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Similar Description - DS1672S-2 |
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