参数资料
型号: CB-OBS411I-04-A
厂商: ConnectBlue
文件页数: 37/42页
文件大小: 0K
描述: KIT EVAL OBS411 RS232
标准包装: 1
系列: CB-OBS
类型: 收发器,Bluetooth 2.1+EDR
频率: 2.4GHz
适用于相关产品: OBS411
已供物品: 蓝牙模块 OBS411i-04,RS232 适配器板,USB 电源电缆,串行电缆,CD
其它名称: 809-1032
connectBlue
Figure 21: A red LED in a 5V host system. The status of the signal can also be used as input to a host controller.
The RED signal pin is also used to select Logic Level mode (instead of RS232) for connectBlue product with internal RS232 driver e.g.
cB-OEMSPA312. The mode functionality is not applicable on cB-OBS411 because there is no internal RS232 driver available. To be
compatible with these products check this signal in their Electrical and Mechanical datasheet.
10.2.3.3 GREEN/Switch-1 signal
The GREEN/Switch-1 signal is a multiplexed signal:
GREEN - Logic green LED signal (see the Operating status section). Becomes valid after the module has started up. The startup
time can be up to 2 seconds (see the Serial Port Adapter AT Commands specification).
Switch-1 - The module reads the status of the signal at startup to decide if the serial interface settings shall be restored (LOW).
The module will restore all factory settings if both the Switch-1 and Switch-0 signals are low during start up. See the Serial Port
Adapter AT Commands specification for more details. The input signal must be stable for the first 500ms after startup (after
reset/power on reset).
The signal is internally pulled-up (see Input/Output signals ) to the internal voltage supply (see Power supply ) for NOT restoring settings to
default values.
NOTE
The internal pull-up is changed compared to previous product generations from connectBlue. See the Migrating from
Bluetooth cB-OEMSPA3xx to cB-OBS4xx products section for more information.
If a LED is used and a switch is required to be able to restore the settings, a high impendence buffer need to prevent the signal from
being pulled-up via the LED. See Figure 22-23 and the Logic Levels section for buffer selection.
Sometimes, over time, switch contacts can get an oxide layer. This may cause the closed switch resistance to become too high to sink
the signal to logic LOW because the signal is internally pulled-up (see Input/Output signals ). A design that prevents this can be found in
Figure 27.
Figure 22: Switch-1 used together with a green LED in a 3.3V host system. The status of the signal can also be used as input to
a host controller. Notice the 1kOhm serial resistor.
Copyright ? 2010 connectBlue AB
Page 37 of 42
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