Q: Looking for details on current consumption for Hibernate / AFE Measurements ?
A: Please refer to AN-1282 in Design Documentation.
Q: Can I get the AFE sequencer to save power in AFE measurement mode ?
A: Yes - during AFE measurement mode, if the core is not being used it can be put into Core-Sleep mode. See Power Management chapter of UG-587 and AN-1282.
Q: Do you have details current consumption in terms of uA/MHz ?
A: Please refer to AN-1282 in Design Documentation.
Q: Do you have a break down of the current consumption of each AFE block ?
| AFE Component Enabled | Typical Current Consumption (mA) | Time To Power Up |
| AFE_Initialised with ACLK On | ||
| AFE_Plus_Aldo | 0.1024 | 2 ms to charge 0.47uF cap to 1.8V |
| AFE_Plus_Ref | 0.3984 | 20 ms to charge 4.7uF cap to 1.8V |
| AFE_Plus_VBias | 0.0623 | 5 ms to charge 0.47uF to 1.1V. |
| AFE_Plus_Adc | 1.3821 |
100uS in total |
| AFE_Plus_TempSns | 0.0063 | |
| AFE_Plus_Dac | 0.2064 | |
| AFE_Plus_ExciteBuf | 0.6449 | |
| AFE_Plus_InAmp | 0.6507 | |
| AFE_Plus_TIA | 0.1854 | |
| AFE_Plus_WaveGen | 0.0065 | |
| Total Current By AFE | 3.6454 |
Q: Do you have ever tested the current consumption of AFE block with real circuit?
When using real circuit, we can’t separate AFE block with other peripherals. Below is some test results with test conditions.
| State | HCLK(MHz) | Current Consumption (mA) | Comments |
| Ready | 1 | 1.1 | Disable peripherals, CORE_SLEEP, ACLK off |
| Ready | 16 | 3.0 | Disable peripherals, CORE_SLEEP, ACLK off |
| ACLK ON | 16 | 4.64 | Disable peripherals, CORE_SLEEP, ACLK on |
| ADC ON | 16 | 6.45 | Disable peripherals, CORE_SLEEP, ACLK on, start ADC conversion, ALDO and Reference are turned on, update rate is 160K (default). |
Q: Do you have a breakdown of the current consumption of each of the clocks in CLKCON5 register ?
| Register CLKCON5 | ||
| Bit | Bit Name | Relative Change in Current (16MHz HCLK State) |
| 8 | CTCLKOFF | 0.023 mA |
| 7 | ACLKOFF | 1.608 mA |
| 6 | Reserved | N/A |
| 5 | UCLKI2SOFF | 0.118 mA |
| 4 | UCLKUARTOFF | 0.185 mA |
| 3 | UCLKI2COFF | 0.082 mA |
| 2 | UCLKSPIHOFF | 0.069 mA |
| 1 | UCLKSPI1OFF | 0.070 mA |
| 0 | UCLKSPI0OFF | 0.086 mA |
