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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)： | 9/26頁 |
| 文件大?。?/td> | 974K |
| 代理商： | LMX9838 |
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The on-chip profiles can be used as interfaces to additional
profiles executed on the host. The LMX9838 includes a con-
figurable service database to answer requests with the pro-
files supported.
11.1.4 Application With Command Interface
The module supports automatic slave operation eliminating
the need for an external control unit. The implemented trans-
parent option enables the chip to handle incoming data raw,
without the need for packaging in a special format. The device
uses a pin to block unallowed connections. This pincode can
be fixed or dynamically set.
Acting as master, the application offers a simple but versatile
command interface for standard Bluetooth operation like in-
quiry, service discovery, or serial port connection. The
firmware supports up to seven slaves. Default Link Policy set-
tings and a specific master mode allow optimized configura-
tion for the application specific requirements. See
Sec-
tion 13.0 Integrated Firmware
.
11.1.5 Memory
The LMX9838 introduces 16 kB of combined system and
Patch RAM memory that can be used for data and/or code
upgrades of the ROM based firmware. Due to the flexible
startup used for the LMX9838 operating parameters like the
Bluetooth Device Address (BD_ADDR) are defined during
boot time. This allows reading out the parameters of an inter-
nal EEPROM or programming them directly over UART.
11.2 TRANSPORT PORT - UART
The LMX9838 provides one Universal Asynchronous Receiv-
er Transmitter (UART). The UART interface consists out of
Receive (RX), Transmit (TX), Ready-to-Send (RTS) and
Clear-to-Send signals. RTS and CTS are used for hardware
handshaking between the host and the LMX9838. Since the
LMX9838 acts as gateway between the bluetooth and the
UART interface, National Semiconductor recommends to use
the handshaking signals especially for transparent operation.
In case two signals are used CTS needs to be pulled to GND.
Please refer also to "LMX9838 Software User’s Guide" for
detailed information on 2-wire operation.
The UART interface supports formats of 8-bit data with or
without parity, with one or two stop bits. It can operate at
standard baud rates from 2400bits/s up to a maximum baud
rate of 921.6kbits/s. DMA transfers are supported to allow for
fast processor independent receive and transmit operation.
The UART baudrate is configured during startup by checking
option pins OP3, OP4 and OP5.
Table 10
gives the corre-
spondence between the OP pins settings and the UART
speed.
The UART offers wakeup from the power save modes via the
multi-input wakeup module. When the LMX9838 is in low
power mode, RTS# and CTS# can function as Host_WakeUp
and Bluetooth_WakeUp respectively.
Table 9
represents the
operational modes supported by the firmware for implement-
ing the transport via the UART.
TABLE 9. UART Operation Modes
Item
Range
Default at Power-Up
Baud Rate
Flow Control
Parity
Stop Bits
Data Bits
2.4 to 921.6 kbits/s
RTS#/CTS# or None
Odd, Even, None
1,2
8
Either configured by option pins, NVS
RTS#/CTS#
None
1
8
TABLE 10. UART Frequency Settings
OP3
(Note 21)
1
1
1
1
OP4
(Note 22)
0
0
1
1
OP5
(Note 23)
0
1
0
1
Function
UART speed read from NVS
UART speed 9.6 kbps
UART speed 115.2 kbps
UART speed 921.6 kbps
Note 21:
If OP3 is 1, must use 1K pull up
Note 22:
If OP4 is 1, must use 1K pull up
Note 23:
If OP5 is 1, must use 1K pull up
11.3 AUDIO PORT
11.3.1 Advanced Audio Interface
The Advanced Audio Interface (AAI) is an advanced version
of the Synchronous Serial Interface (SSI) that provides a full-
duplex communications port to a variety of industry-standard
13/14/15/16-bit linear or 8-bit log PCM codecs, DSPs, and
other serial audio devices.
The interface allows the support one codec or interface. The
firmware selects the desired audio path and interface config-
uration by a parameter that is located in RAM (imported from
non-volatile storage or programmed during boot-up). The au-
dio path options include the OKI MSM7717 codec, the Win-
bond W681360/W681310 codecs and the PCM slave through
the AAI.
In case an external codec or DSP is used the LMX9838 audio
interface generates the necessary bit and frame clock driving
the interface.
Table 11
summarizes the audio path selection and the con-
figuration of the audio interface at the specific modes.
The LMX9838 supports one SCO link.
9
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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