DS32KHZSLASHDIP datasheet(7/10 Pages) DALLAS

7 / 10 page

DS32kHz

7 of 10

Figure 4 illustrates how a standard 32.768kHz crystal and the DS32kHz should be connected to address the

interchangeable option. Using this connection scheme and the recommended layout provides a solution, which

requires no hardware modifications. Only one device should be used at a time, and both layouts should be located

very close together if the recommended layout is not used.

The DS32kHz ICC and IBAT currents are specified with no output loads. Many RTC oscillator circuits use a quartz

crystal or resonator. Driving the oscillator circuit with the rail-to-rail output of the DS32kHz can increase the ICC and

IBAT currents significantly and increase the current consumption of the RTC as well. Figure 5 shows one circuit that

can be used to reduce the current consumption of a DS32kHz and an RTC. The values of R1 and C1 may vary

depending on the RTC used. However, values of 1.0M

W and 100pF are recommended as a starting point. R2 is

used to shift the input waveform to the proper level. The recommended value for R2 is 33k

Figure 4. DS32kHz Connections

Figure 5. DS32kHz and RTC Connections

THIS SHOWS A CIRCUIT THAT CAN BE USED TO REDUCE

THE CURRENT CONSUMPTION OF A DS32kHz AND AN RTC.

THE STANDARD 32.768kHz CRYSTAL AND THE DS32kHz SHOULD BE CONNECTED TO ADDRESS THE

INTERCHANGEABLE OPTION.

DS32KHZ/DIP Datasheet(PDF) 7 Page - Dallas Semiconductor