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| 型号： | 1SPP-BT-F |
| 厂商： | Future Designs Inc |
| 文件页数： | 69/72页 |
| 文件大小： | 0K |
| 描述： | KIT DEMO BLUETOOTH |
| 标准包装： | 1 |
| 类型： | 蓝牙 |
| 频率： | 2.4GHz |
| 适用于相关产品： | BGB203 |
| 已供物品： | 2 个板和 USB 线缆 |
| 其它名称： | 622-1020 |
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Philips Semiconductors
UM_1SPP
BGB203 BT 2.0 Serial Port Profile Module User’s Guide
10.
Radio Calibration
This section serves to describe the procedure for calibrating the internal Bluetooth radio.
This procedure is required because of the differing tolerances of external components
(e.g. crystals, resistors, capacitors, board layout, etc.). The outcome of a successful
calibration will yield an integer value (in the range of 0 through 255) that will be used as
the RXTUN value in the AT+BTSET command.
The following tools will be needed to perform the calibration:
? Host to send commands to the BGB203 running the 1SPP firmware
? BGB203 running the 1SPP firmware (in the circuit to be calibrated)
? High precision frequency counter
The procedure begins by making sure that the host can communicate with the
BGB203/1SPP using the AT-command set described elsewhere in this document. It
should be noted that calibration needs to occur on the actual design that is to be used by
the BGB203/1SPP solution. It should also be noted that if the same design is produced
with different production runs (‘lots’) of chips then the different production runs should be
calibrated separately for the best performance (note that this could mean calibrating a
few boards from each of the lots and determining an average value that can be used to
calibrate all the boards).
Connect the frequency counter to the CTS/EXT_CLK output on the BGB203 (pin 42). All
hardware has been configured at this point.
To perform the actual calibration, the AT+BTRXT command will be used. This command
takes two parameters. The first, an integer, specifies whether or not calibration is to be
performed. A value of zero means that calibration is not to be performed; a value of one
means that calibration is to be performed. The final parameter is the RXTUN value to
use for the calibration. This value will be an integer in the range of 0 to 255.
The procedure for determining the RXTUN value begins by issuing the AT+BTRXT
command, enabling calibration, and choosing an initial value. For example:
AT+BTRXT=1,128
OK
After the command is issued, a 12 MHz clock should be output on the CTS/EXT_CLK
output of the BGB203 (pin 42). The frequency of this clock can be measured with the
high precision frequency counter. The actual calibration involves changing the value of
the RXTUN parameter (the last parameter) until the clock that is output is as close to 12
MHz as possible (using the calibration process). Once the 12 MHz clock is observed the
value that was used for the RXTUN parameter should be noted. This is the value that
will be used as the RXTUN value in the AT+BTSET command.
To increase the speed at which the correct RXTUN value is found a binary search
methodology can be employed to more quickly locate the correct value. For this
approach to work, it must be determined if larger values of RXTUN increase or decrease
the frequency (and consequently smaller values will achieve the opposite result). After
this is determined, values should be picked that either increase or decrease the
? Koninklijke Philips Electronics N.V. 2005
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner. The information presented in this document does
not form part of any quotation or contract, is believed to be accurate and reliable and may
be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.
Date of release:21 Dec 2005
Published in The Netherlands
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