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參數(shù)資料
| 型號： | LMX9838 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Bluetooth Serial Port Module |
| 中文描述： | 藍牙串行端口模塊 |
| 文件頁數(shù)： | 14/26頁 |
| 文件大?。?/td> | 974K |
| 代理商： | LMX9838 |
14.0 Low Power Modes
The LMX9838 supports different Low Power Modes to reduce
power in different operating situations. The modular structure
of the LMX9838 allows the firmware to power down unused
modules.
The Low power modes have influence on:
UART transport layer
– enabling or disabling the interface
Bluetooth Baseband activity
– firmware disables LLC and Radio if possible
14.1 POWER MODES
The following LMX9838 power modes, which depend on the
activity level of the UART transport layer and the radio activity
are defined:
The radio activity level mainly depends on application re-
quirements and is defined by standard bluetooth operations
like inquiry/page scanning or an active link.
A remote device establishing or disconnecting a link may also
indirectly change the radio activity level.
The UART transport layer by default is enabled on device
power up. In order to disable the transport layer the command
“Disable Transport Layer” is used. Thus only the Host side
command interface can disable the transport layer. Enabling
the transport layer is controlled by the HW Wakeup signalling.
This can be done from either the Host or the LMX9838. See
also “LMX9838 Software User’s Guide” for detailed informa-
tion on timing and implementation requirements.
TABLE 15. Power Mode Activity
UART
Activity
Activity
OFF
OFF
ON
OFF
OFF
Scanning
Power
Mode
PM0
PM1
PM2
Radio
Reference
Clock
none
Main Clock
Main Clock /
32.768 kHz
Main Clock
Main Clock
Main Clock
PM3
PM4
PM5
ON
OFF
ON
Scanning
SPP Link
SPP Link
30027921
FIGURE 5. Transition between different Hardware Power Modes
14.2 ENABLING AND DISABLING UART TRANSPORT
14.2.1 Hardware Wakeup Functionality
In certain usage scenarios the host is able to switch off the
transport layer of the LMX9838 in order to reduce power con-
sumption. Afterwards both devices, host and LMX9838 are
able to shut down their UART interfaces.
In order to save system connections the UART interface is
reconfigured to hardware wakeup functionality. For a detailed
timing and command functionality please see also the
“LMX9838 Software User’s Guide”. The interface between
host and LMX9838 is defined as described in
Figure 6
.
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMX9838SB | Bluetooth Serial Port Module |
| LMX9838SBX | Bluetooth Serial Port Module |
| LNBEH21 | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE |
| LNBEH21PD | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE |
| LNBEH21PD-TR | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX9838_0709 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Bluetooth㈢ Serial Port Module |
| LMX9838DONGLE | 功能描述:藍牙/802.15.1 模塊 RoHS:否 制造商:Murata Wireless Solutions 類:1 頻帶:2402 MHz to 2480 MHz 靈敏度:- 92 dBm 數(shù)據(jù)速率: 工作電源電壓:2.2 V to 3.3 V 輸出功率: 接口類型:PCM, UART 天線連接器類型:Chip 最大工作溫度:+ 85 C 尺寸:17.5 mm x 16 mm x 2 mm |
| LMX9838DONGLE/NOPB | 功能描述:藍牙/802.15.1 模塊 RoHS:否 制造商:Murata Wireless Solutions 類:1 頻帶:2402 MHz to 2480 MHz 靈敏度:- 92 dBm 數(shù)據(jù)速率: 工作電源電壓:2.2 V to 3.3 V 輸出功率: 接口類型:PCM, UART 天線連接器類型:Chip 最大工作溫度:+ 85 C 尺寸:17.5 mm x 16 mm x 2 mm |
| LMX9838SB | 制造商:Texas Instruments 功能描述:Bluetooth Class II 3.3V 0.704Mbps 70-Pin LTCC Tray |
| LMX9838SB/NOPB | 功能描述:藍牙/802.15.1 模塊 RoHS:否 制造商:Murata Wireless Solutions 類:1 頻帶:2402 MHz to 2480 MHz 靈敏度:- 92 dBm 數(shù)據(jù)速率: 工作電源電壓:2.2 V to 3.3 V 輸出功率: 接口類型:PCM, UART 天線連接器類型:Chip 最大工作溫度:+ 85 C 尺寸:17.5 mm x 16 mm x 2 mm |
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