User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
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www.lairdtech.com/bluetooth
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CONN-GUIDE-BT730_v0.9
4. IO CHARACTERISTICS
4.1 Power Consumption
The current drain from the VCC power input line is dependent on various factors. The three most
significant factors are the voltage level at VCC, UART baud rate, and the operating mode. The hardware
specification for the module allows for a voltage range of 3.0 to 5.0 at VCC. The unit includes a linear
regulator and tests have shown that there is no significant difference in current draw when VCC changes
within the operating limits. Tests have shown that where power dissipation is an issue, it is best to keep
VCC at the lower end of the range.
The UART baud rate has a bearing on power dissipation because as is normal for digital electronics, the
power requirements increase linearly with increasing clocking frequencies. Because of this, higher baud
rates result in a higher current drain. Finally, the significant operating modes are: idle, waiting for a
connection, inquiring, initiating a connection, sniff, and connected. With connected mode, it is also
relevant to differentiate between no data being transferred and when data is being transferred at the
maximum rate possible. The AT command set document describes how to configure the module for
optimal power performance.
4.2 Typical Current Consumption in mA
Table 4-2: Current Consumption
VCC = 3.8V, Baudrate = 9600bps
Range = >1 meters
Typical Current (mA)
Idle Mode, S512=1
TBC
Wait for Connection Or Discoverable Mode,
AT+BTP
S508=S510=640, S509=S511=320
TBC
Wait for Connection Or Discoverable Mode,
AT+BTP
S508=S510=1000, S509=S511=11
TBC
Inquiry Mode, AT+BTIN
TBC
Connecting Mode (ATDxxx)
TBC
Connected Mode (No Data Transfer)
TBC
Connected Mode (Max Data Transfer)
TBC