Datasheet
3. CAPTRM=0, DELVOL=2, and fixed external capacitance of 20 pF.
4. CAPTRM=0, EXTCHRG=9, and fixed external capacitance of 20 pF.
5. The programmable current source value is generated by multiplying the SCANC[REFCHRG] value and the base current.
6. The programmable current source value is generated by multiplying the SCANC[EXTCHRG] value and the base current.
7. Measured with a 5 pF electrode, reference oscillator frequency of 10 MHz, PS = 128, NSCN = 8; Iext = 16.
8. Measured with a 20 pF electrode, reference oscillator frequency of 10 MHz, PS = 128, NSCN = 2; Iext = 16.
9. Measured with a 20 pF electrode, reference oscillator frequency of 10 MHz, PS = 16, NSCN = 3; Iext = 16.
10. Sensitivity defines the minimum capacitance change when a single count from the TSI module changes, it is equal to (C
ref
* I
ext
)/( I
ref
* PS * NSCN). Sensitivity depends on the configuration used. The typical value listed is based on the following
configuration: Iext = 5 μA, EXTCHRG = 4, PS = 128, NSCN = 2, I
ref
= 16 μA, REFCHRG = 15, C
ref
= 1.0 pF. The
minimum sensitivity describes the smallest possible capacitance that can be measured by a single count (this is the best
sensitivity but is described as a minimum because it’s the smallest number). The minimum sensitivity parameter is based
on the following configuration: I
ext
= 1 μA, EXTCHRG = 0, PS = 128, NSCN = 32, I
ref
= 32 μA, REFCHRG = 31, C
ref
= 0.5
pF
11. 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.
12. CAPTRM=7, DELVOL=2, REFCHRG=0, EXTCHRG=4, PS=7, NSCN=0F, LPSCNITV=F, LPO is selected (1 kHz), and
fixed external capacitance of 20 pF. Data is captured with an average of 7 periods window.
6.9.2 LCD electrical characteristics
Table 51. LCD electricals
Symbol Description Min. Typ. Max. Unit Notes
f
Frame
LCD frame frequency 28 30 58 Hz
C
LCD
LCD charge pump capacitance — nominal value — 100 — nF 1
C
BYLCD
LCD bypass capacitance — nominal value — 100 — nF 1
C
Glass
LCD glass capacitance — 2000 8000 pF 2
V
IREG
V
IREG
• HREFSEL=0, RVTRIM=1111
• HREFSEL=0, RVTRIM=1000
• HREFSEL=0, RVTRIM=0000
• HREFSEL=1, RVTRIM=1111
• HREFSEL=1, RVTRIM=1000
• HREFSEL=1, RVTRIM=0000
—
—
—
—
—
—
1.11
1.01
0.91
1.84
1.69
1.54
—
—
—
—
—
—
V
V
V
V
V
V
3
Δ
RTRIM
V
IREG
TRIM resolution — — 3.0 % V
IREG
— V
IREG
ripple
• HREFSEL = 0
• HREFSEL = 1
—
—
—
—
30
50
mV
mV
I
VIREG
V
IREG
current adder — RVEN = 1 — 1 — µA 4
I
RBIAS
RBIAS current adder
• LADJ = 10 or 11 — High load (LCD glass
capacitance ≤ 8000 pF)
• LADJ = 00 or 01 — Low load (LCD glass
capacitance ≤ 2000 pF)
—
—
10
1
—
—
µA
µA
Table continues on the next page...
Peripheral operating requirements and behaviors
K40 Sub-Family Data Sheet Data Sheet, Rev. 7, 02/2013.
66 Freescale Semiconductor, Inc.