DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 83

• 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
83 www.lairdtech.com
®
Multimedia Plus Module
4. Mic Bias
Mic Bias is enabled by S-Register 416 : 1=enable, 0=disable.
Mic Bias Current is controlled by S-Register 417 as outlined in Table 3.37.
Mic Bias Voltage is controlled by S-Register 418 as shown in Table 3.38.
These settings apply only if the audio subunit is activated (e.g., while in audio loopback mode/while
in SCO connection/while in A2DP connection). Otherwise, S416 to S418 will not have any effect.
S Register 417
S Register 418
10
11
12
13
14
15
Table 3.37: Mic Bias Current Output – S417
10
11
12
13
14
15
Table 3.38: Mic Bias Voltage Output – S418
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
Mic Bias Current Output [mA]
Mic Bias Voltage Output [V]
0.237 - 0.394
0.296 - 0.492
0.354 - 0.589
0.412 - 0.687
0.471 - 0.785
0.530 - 0.883
0.589 - 0.980
0.647 - 1.078
0.706 - 1.176
0.764 - 1.273
0.823 - 1.371
0.882 - 1.469
0.940 - 1.566
0.998 - 1.664
1.057 - 1.762
1.116 - 1.859
1.61 - 1.80
1.65 - 1.86
1.71 - 1.93
1.76 - 1.98
1.84 - 2.06
1.89 - 2.14
1.97 - 2.23
2.04 - 2.32
2.18 - 2.46
2.27 - 2.58
2.39 - 2.72
2.50 - 2.87
2.70 - 3.09
2.85 - 3.29
3.07 - 3.56
3.28 - 3.84
Laird Technologies