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4. I/O Characteristics
4.1Power 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 Baudrate and the operating mode.
The hardware specification for the Module allows for a voltage range of 3.6 to 7.0 at Vcc. Tests have shown that there is no significant difference in current draw when Vcc is 5 or 6V. Therefore the data presented below, pertains to Vcc levels of 3.6 and 5v only. Tests have shown that where power drain is an issue, it is best to keep Vcc at the lower end of the range.
The UART baudrate has a bearing on power drain because as is normal for digital electronics, the power requirements increase linearly with increasing clocking frequencies. Hence higher baudrates result in a higher current drain.
Finally with regards to operating mode the significant 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.
4.1.1Typical Current Consumption in mA
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| Baudrate |
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| 9,600 |
| 38,400 |
| 115,200 |
| 460,800 |
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| Idle Mode, S512=1 |
| 3.6v | 1.60 |
| 1.80 |
| 1.96 |
| 3.00 |
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| 5.0v | 2.00 |
| 2.10 |
| 2.30 |
| 3.40 |
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| Wait for Connection Or Discoverable Mode, |
| 3.6v | 59.00 |
| 59.00 |
| 59.00 |
| 59.00 |
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| AT+BTP |
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| 5.0v | 65.00 |
| 65.00 |
| 65.00 |
| 65.00 |
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| S508=S510=640, S509=S511=320 |
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| Wait for Connection Or Discoverable Mode, |
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| 3.6v | 2.75 |
| 2.94 |
| 3.10 |
| 4.12 |
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| AT+BTP |
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| 5.0v |
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| 3.26 |
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| 3.36 |
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| 3.55 |
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| 4.63 |
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| S508=S510=1000, S509=S511=11* |
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| Inquiring Mode, AT+BTI |
| 3.6v | 50.00 |
| 50.00 |
| 50.00 |
| 50.00 |
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| 5.0v | 54.00 |
| 54.00 |
| 54.00 |
| 54.00 |
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| Connecting Mode (ATDxxx) |
| 3.6v | 50.00 |
| 50.00 |
| 50.00 |
| 50.00 |
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| 5.0v | 54.00 |
| 54.00 |
| 54.00 |
| 54.00 |
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| Connected Mode (No Data Transfer) |
| 3.6v | 6.00 |
| 6.10 |
| 6.40 |
| 7.20 |
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| 5.0v | 7.20 |
| 7.20 |
| 7.40 |
| 8.20 |
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| Connected Mode (Max Data Transfer) |
| 3.6v | 21.50 |
| 22.50 |
| 24.50 |
| 32.50 |
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| 5.0v | 24.50 |
| 26.00 |
| 28.00 |
| 36.00 |
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Notes: These figures were obtained with
* Calculated figures
