K20P144M100SF2 Datasheet, PDF (58/67 Pages) Freescale Semiconductor, Inc – K20 Sub-Family Data Sheet

Dimensions
3. 75pF load
4. 15pF load
6.9.2 TSI Electrical Specifications
Table 44. Touch Sensing Input module specifications
Symbol Description
Min.
Typ.
Max.
Unit
Notes
V_DDTSI Operating voltage
1.71
—
3.6
V
C_ELE
f_REFmax
f_ELEmax
C_REF
V_DELTA
I_REF
I_ELE
Pres5
Target electrode capacitance range
Reference oscillator frequency
Electrode oscillator frequency
Internal reference capacitor
Oscillator delta voltage
Reference oscillator current source base current
Electrode oscillator current source base current
Electrode capacitance measurement precision
1
—
—
TBD
TBD
TBD
TBD
—
20
5.5
0.5
y ₁
r ₆₀₀
a¹
1
in^TBD
500
TBD
TBD
TBD
TBD
TBD
TBD
TBD
pF
MHz
MHz
pF
mV
μA
μA
%
1
2
3
4
Pres20 Electrode capacitance measurement precision
—
TBD
TBD
%
Pres100 Electrode capacitance measurement precision
—
TBD
TBD
%
Max‐ Max sensitivity @ 20pF electrode
lim ^Sens20
0.15
0.326
600
fF
MaxSens Maximum sensitivity
0.006
0.326
24
fF
Res Resolution
—
—
16
bits
T_Con20 Response time @ 20pF
—
30
—
μs
e _{ITSI_RUN Current added in run mode}
—
TBD
—
μA
r _{ITSI_LP Low power mode current adder}
—
1
TBD
μA
P ^{1. The TSI module is functional with capacitance values outside of this range. However, optimal performance is not}
5
6
7
8
9
guaranteed.
2. The programmable current source value is generated by multiplying the SCANC[REFCHRG] value and the base current
3. The programmable current source value is generated by multiplying the SCANC[EXTCHRG] value and the base current
4. Measured with a 5pF electrode, reference oscillator frequency of 10MHz, PS = 128, NCSC = 8; Iext = 16
5. Measured with a 20pF electrode, reference oscillator frequency of 10MHz, PS = 128, NCSC = 2; Iext = 16
6. Measured with a 20pF electrode, reference oscillator frequency of 10MHz, PS = 16, NCSC = 3; Iext = 16
7. 6.2ms scan time
8. 1pF electrode capacitance with 4.96ms scan time
9. Time that takes to do one complete measurement of the electrode. Sensitivity resolution of 0.0133pF
7 Dimensions
K20 Sub-Family Data Sheet Data Sheet, Rev. 1, 11/2010.
58
Preliminary
Freescale Semiconductor, Inc.