参数资料
型号: CB-ACC-27
厂商: ConnectBlue
文件页数: 49/58页
文件大小: 510K
描述: ANTENNA 1/2WAVE 2.4GHZ 10CM U.FL
标准包装: 1
天线类型: 鞭状:1/2 波,偶极
频带数目: 1
频率: 2.4GHz
增益: 2dBi
端子: U.FL(IPEX)
安装类型: 底座安装
高度(最大): 4.25"(108mm)
包装: 散装
产品目录页面: 558 (CN2011-ZH PDF)
其它名称: 809-1000
 
 
 
 
 
 
 
Version 1.17  2011-09
49
A.2 Design Examples
This section contains design examples for all interfaces on J2, J3, J6, J7 and J8. The con-
nector type that suits a specific application depends on the needed signal and the preferred
interface type (wires, flexfilm, board-to-board or SMD).
A.2.1 Logic Levels
A 3.0/3.3V host system can be connected directly to the logic level pins (BLUE, UART-TxD /
UART-RxD etc). A serial 100& resistor shall be used (see Figure 11) for protection, see Ta-
ble 12 for logic levels characteristics.
A 5V host system can easily be adjusted to the logic levels. A host system output signal can
use a resistive divider (1.8k&/2.2k&) to adjust the levels. This is applicable for speeds up to
115.2kBits/s. The divider can be improved by adding a logic buffer (74HCT08) for higher
speeds (see Figure 12). The host system input pins could require a buffer (see Figure 12)
depending on the logic level requirements (see Table 12).
The 74HCT08 gate is also available in a single gate package (74AHCT1G08).
 
 
Figure 11: Logic levels interface to a 3/3.3V
system. A protective 100&
&  &
& resistor is used. 
Figure 12: Interface example with logic levels to a 5V
system.
 
 
A 5V system with open collector outputs is designed in Figure 13.
 
Figure 13: Open collector outputs.
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