Table 44. TSI electrical specifications (continued)
Symbol
Description
Min.
Typ.
Max.
Unit
Notes
CREF
Internal reference capacitor
TBD
1
TBD
pF
VDELTA
Oscillator delta voltage
TBD
600
TBD
mV
IREF
Reference oscillator current source base current
TBD
1
TBD
μA
IELE
Electrode oscillator current source base current
TBD
1
TBD
μA
Pres5
Electrode capacitance measurement precision
—
TBD
%
Pres20
Electrode capacitance measurement precision
—
TBD
%
Pres100
Electrode capacitance measurement precision
—
TBD
%
MaxSens2
0
Maximum sensitivity @ 20 pF electrode
0.003
0.25
—
fF/count
MaxSens Maximum sensitivity
0.003
—
fF/count
Res
Resolution
—
16
bits
TCon20
Response time @ 20 pF
8
15
25
μs
ITSI_RUN
Current added in run mode
—
TBD
—
μA
ITSI_LP
Low power mode current adder
—
1
TBD
μA
1. The TSI module is functional with capacitance values outside this range. However, optimal performance is not guaranteed.
2. The programmable current source value is generated by multiplying the SCANC[REFCHRG] value and the base current.
3. Measured with a 5 pF electrode, reference oscillator frequency of 10 MHz, PS = 128, NSCN = 8; Iext = 16.
4. Measured with a 20 pF electrode, reference oscillator frequency of 10 MHz, PS = 128, NSCN = 2; Iext = 16.
5. Measured with a 20 pF electrode, reference oscillator frequency of 10 MHz, PS = 16, NSCN = 3; Iext = 16.
6. Measured with a 20 pF electrode, reference oscillator frequency of ~5 MHz (IREF = 5 μA, REFCHRG = 4), PS = 128,
NSCN = 2; Iext = 16 (EXTCHRG = 15).
7. Typical value depends on the configuration used.
8. Time to do one complete measurement of the electrode. Sensitivity resolution of 0.0133 pF, PS = 0, NSCN = 0, 1
electrode, DELVOL = 2, EXTCHRG = 15.
6.9.2 LCD electrical characteristics
Table 45. LCD electricals
Symbol
Description
Min.
Typ.
Max.
Unit
Notes
fFrame
LCD frame frequency
28
30
58
Hz
LCD charge pump capacitance — nominal value
—
100
—
nF
CBYLCD
LCD bypass capacitance — nominal value
—
100
—
nF
CGlass
LCD glass capacitance
—
2000
8000
pF
VIREG
VIREG — HREFSEL = 0
HREFSEL = 0
HREFSEL = 1
0.89
1.49
1.00
1.67
1.15
1.85
V
ΔRTRIM
VIREG TRIM resolution
3.0
—
% VIREG
Table continues on the next page...
Peripheral operating requirements and behaviors
K40 Sub-Family Data Sheet Data Sheet, Rev. 4, 3/2011.
Freescale Semiconductor, Inc.
Preliminary
63