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DS32kHz
Figure 4. Power-Supply Connections
4.5V - 5.5V
4.5V - 5.5V
Vcc
Vcc
Vcc
2.7V - 3.3V
Vbat
32.768kHz out
2.7V - 5.5V
Vbat
32.768kHz out
Vbat
32.768kHz out
GND
A
GND
B
GND
C
Figure 5 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 I CC and I BAT 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 I CC and
I BAT currents significantly and increase the current consumption of the RTC as well. Figure 6 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 Ω 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 Ω .
Figure 5. DS32kHz Connections
V CC
32kHz out
X1 or Xin
V CC
V BAT
DS32kHz
32.768 Hz
RTC
X2 or Xout
V BAT
A PC board can be laid out so that the RTC can use either the DS32kHz or a crystal
Figure 6. DS32kHz and RTC Connections
V CC
R1
1M Ω
C1
100pF
V CC
V BAT
DS32kHz
R2
33k Ω
X1
X2
RTC
V BAT
7 of 8
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相关PDF资料
DS32KHZSN#-W IC OSC 32.768KHZ TEMPCOMP 16SOIC
DV1-100 DIGIVIEW LOGIC ANALYZER 100MHZ
DV75C-020.0M OSC TCXO 20.000 MHZ 3.3V SMD
DV75D-020.0M OSC TCXO 20.000 MHZ 3.3V SMD
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相关代理商/技术参数
DS32KHZN/BGA/T&R/ 功能描述:TCXO振荡器 RoHS:否 制造商:AVX 封装 / 箱体: 频率:32.768 kHz 频率稳定性: 负载电容:15 pF 端接类型:SMD/SMT 电源电压:3 V 尺寸:2.5 mm W x 3.2 mm L x 1 mm H 输出格式:CMOS 最小工作温度:- 40 C 最大工作温度:+ 85 C 封装:Reel
DS32KHZN/DIP 功能描述:TCXO振荡器 32.768Khz Temp Cntrld Crystal Osc RoHS:否 制造商:AVX 封装 / 箱体: 频率:32.768 kHz 频率稳定性: 负载电容:15 pF 端接类型:SMD/SMT 电源电压:3 V 尺寸:2.5 mm W x 3.2 mm L x 1 mm H 输出格式:CMOS 最小工作温度:- 40 C 最大工作温度:+ 85 C 封装:Reel
DS32KHZ-N/DIP 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:32.768kHz Temperature-Compensated Crystal Oscillator
DS32KHZN/WBGA 功能描述:TCXO振荡器 32.768Khz Temp Cntrld Crystal Osc RoHS:否 制造商:AVX 封装 / 箱体: 频率:32.768 kHz 频率稳定性: 负载电容:15 pF 端接类型:SMD/SMT 电源电压:3 V 尺寸:2.5 mm W x 3.2 mm L x 1 mm H 输出格式:CMOS 最小工作温度:- 40 C 最大工作温度:+ 85 C 封装:Reel
DS32KHZ-N/WBGA 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:32.768kHz Temperature-Compensated Crystal Oscillator
DS32KHZN/WBGA/T&R 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:CNTRLD OSC 0.032768MHZ TCXO CMOS 36BGA - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC OSC TCXO 32.768KHZ 5V 36-BGA
DS32KHZN/WBGA/T&R-W 制造商:Maxim Integrated Products 功能描述:CNTRLD OSC 0.032768MHZ TCXO CMOS 36BGA - Tape and Reel
DS32KHZN/WBGA/T&R 功能描述:TCXO振荡器 32.768Khz Temp Cntrld Crystal Osc RoHS:否 制造商:AVX 封装 / 箱体: 频率:32.768 kHz 频率稳定性: 负载电容:15 pF 端接类型:SMD/SMT 电源电压:3 V 尺寸:2.5 mm W x 3.2 mm L x 1 mm H 输出格式:CMOS 最小工作温度:- 40 C 最大工作温度:+ 85 C 封装:Reel