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参数资料
| 型号： | DS32KHZ/WBGA |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC OSC TCXO 32.768KHZ 5V 36-BGA |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 110 |
| 系列： | DS |
| 类型： | TCXO |
| 频率： | 32.768kHz |
| 输出： | CMOS |
| 电源电压： | 5V |
| 频率稳定性： | ±7.5ppm |
| 工作温度： | 0°C ~ 70°C |
| 电流 - 电源（最大）： | 220µA |
| 安装类型： | 表面贴装 |
| 尺寸/尺寸： | 0.450" L x 0.400" W（11.43mm x 10.16mm） |
| 高度： | 0.101"（2.56mm） |
| 封装/外壳： | 36-BGA |
| 包装： | 托盘 |
DS32kHz
The DS32kHz is packaged in a 36-pin ball grid array (BGA). It also is available in a 16-pin 0.300” SO and a 14-pin
encapsulated DIP (EDIP) module.
The additional PC board space required to add the DS32kHz as an option for driving a RTC is negligible in many
applications (see Figure 6 ) Therefore, adding the DS32kHz to new designs and future board revisions allows the
use of the DS32kHz where applications require improved timekeeping accuracy.
Figure 3. Block Diagram
V CC
Temperature
Measurement
Dallas
Semiconductor
DS32kHz
V BAT
Power
Switching
Circuit
Power Control
P
32.768kHz
N
GND
OPERATION
The DS32kHz module contains a quartz tuning-fork crystal and an IC. When power is first applied, and when the
device switches between supplies, the DS32kHz measures the temperature and adjusts the crystal load to
compensate the frequency. The power supply must remain at a valid level whenever a temperature measurement
is made, including when V CC is first applied. While powered, the DS32kHz measures the temperature once every
64 seconds and adjusts the crystal load.
The DS32kHz is designed to operate in two modes. In the dual-supply mode, a comparator circuit, powered by V CC ,
monitors the relationship between the V CC and V BAT input levels. When V CC drops below a certain level compared to
V BAT , the device switches over to V BAT ( Figure 4A ). This mode uses V CC to conserve the battery connected to V BAT
while V CC is applied.
In the single-supply mode, V CC is grounded and the unit is powered by V BAT . Current consumption is less than V CC ,
because the comparator circuit is unpowered ( Figure 4B ).
Figure 4A shows how the DS32kHz should be connected when using two power supplies. V CC should be between
4.5V and 5.5V, and V BAT should be between 2.7V and 3.5V. Figure 4B shows how the DS32kHz can be used when
only a single-supply system is available. V CC should be grounded and V BAT should then be held between 2.7V and
5.5V. The V BAT pin should be connected directly to a battery. Figure 4C shows a single-supply mode where V CC is
held at +5V. See the frequency stability vs. operating voltage for information about frequency error vs. supply
voltage.
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