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In noise detection mode the reference oscillator has the same configuration except the
output goes to Counter2 and this counter will have its maximum count set by
NSCNx2
(PS)
. This means this oscillator will setup the noise detection mode sense
duration.
The blocks of external oscillator is changed and instead of an oscillator the circuit
implements an RF amplitude detection. The threshold for this amplitude detection is set
by DVOLT register bits.
Also the external voltage is biased by vmid voltage with a Rs series resistance.
The vmid voltage is defined as V(vmid) = (V(vp) + V(vm))/2.
The Rs value is defined by TSI_GENCS[EXTCHRG] register bits.
Counter2
Counter1
Figure 49-4. TSI circuit in noise detection mode
To determine the noise level the below algorithm can be used:
1. Initialize Rs = maxrs; Dvolt = minDv (set other configurations also)
2. Perform a noise cycle.
Chapter 49 Touch Sensing Input (TSI)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
1281
Содержание K32 L2A Series
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