ADuCM350 FAQ Power Consumption

Document created by LiamR Employee on Apr 24, 2014Last modified by NeoXu on Dec 21, 2016
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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 EnabledTypical Current Consumption (mA)Time To Power Up
AFE_Initialised with ACLK On
AFE_Plus_Aldo 0.10242 ms to charge 0.47uF cap to 1.8V
AFE_Plus_Ref    0.398420 ms to charge 4.7uF cap to 1.8V
AFE_Plus_VBias   0.06235 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 AFE3.6454

 

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.

 

StateHCLK(MHz)Current Consumption (mA)Comments
Ready1.1Disable peripherals, CORE_SLEEP, ACLK off
Ready163.0Disable peripherals, CORE_SLEEP, ACLK off
ACLK ON  164.64Disable peripherals, CORE_SLEEP, ACLK on
ADC ON166.45Disable 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 NameRelative Change in Current (16MHz HCLK State)
8CTCLKOFF0.023 mA
7ACLKOFF1.608 mA
6ReservedN/A
5UCLKI2SOFF0.118 mA
4UCLKUARTOFF0.185 mA
3UCLKI2COFF0.082 mA
2UCLKSPIHOFF0.069 mA
1UCLKSPI1OFF0.070 mA
0UCLKSPI0OFF0.086 mA

 

   

 

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