DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 56

• Manufacturer Part Number: DVK-BTM521
• Description: BT MM DEV KIT
• Manufacturer: Laird Technologies
• Type: Transceiver, Bluetoothr

Specifications of DVK-BTM521

• Frequency: 2.4GHz
• Interface Type: RS-232
• Processor Series: BTM521
• Silicon Manufacturer: Laird Technologies
• Kit Application Type: Communication & Networking
• Application Sub Type: Bluetooth
• Kit Contents: Development Board & Software Tools
• Features: Supports CSR
• Rohs Compliant: Yes
• For Use With/related Products: BTM521
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: DVK-BTM521

BTM520/521
Bluetooth
AT COMMAND SET
REFERENCE
56 www.lairdtech.com
®
Multimedia Plus Module
Microphone
HSP Feature
1. Incoming audio connection
2. Outgoing audio connection
3. Audio connection transfer
4. Remote audio volume control
M: mandatory
O: optional
(1) Supported planned for future firmware release
1 Button
Speaker
6.1 Headset role (HS)
Headset role is activated by setting flag 0x02 in S102 plus “AT&W” plus “ATZ“.
Figure 3.22 shows a block diagram of a headset and how a BTM5xx module would be integrated
in hosted operation mode.
6.1.1 Initiate ACL connection from HS
6.1.2 Send “AT+CKPD=200”
AT+HSD<bd_addr
Initiate ACL connection from local headset instance to remote device with <bd_addr
The remote device must support the audio gateway role (AG) of the headset profile (HSP).
Response:
Or:
Or:
Or:
After an ACL connection has been established, the module remains in AT command mode.
S Register 531 is ignored for HSP connections. An audio connection should be established
within short time. The command is “AT+HSB”.
AT+HSB
Send “AT+CKPD=200” to connected audio gateway. This indicates a user initiated action
to the gateway, e.g., a button press. Depending on the current audio connection state,
the audio gateway will establish or release the audio connection subsequently. Please refer
to Table 3.25.
Table 3.24: Headset Profile supported features on BTM5xx
<cr,lf>CONNECT 123456789012,1112,><cr,lf>
<cr,lf>NO CARRIER<cr,lf>
<cr,lf>ERROR 59<cr,lf>
<cr,lf>ERROR 63<cr,lf>
hex
Figure 3.22 Headset block diagram
Audio
>
Specification
Controller
M
M
M
Support in HS
O
Host
BTM5xx [HS]
BTM5xx
Yes
Yes
Yes
(1)
Specification
M
M
O
O
Support in AG
AT command
interface
Laird Technologies
BTM5xx
Yes
Yes
Yes
(1)
hex
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