MK61FN1M0VMD12 FREESCALE [Freescale Semiconductor, Inc], MK61FN1M0VMD12 Datasheet - Page 72

• Manufacturer Part Number: MK61FN1M0VMD12
• Description: K61 Sub-Family Data Sheet
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Dimensions
6.9.1 TSI electrical specifications
1. The TSI module is functional with capacitance values outside this range. However, optimal performance is not guaranteed.
2. Fixed external capacitance of 20 pF.
3. The programmable current source value is generated by multiplying the SCANC[REFCHRG] value and the base current.
4. The programmable current source value is generated by multiplying the SCANC[EXTCHRG] value and the base current.
5. Measured with a 5 pF electrode, reference oscillator frequency of 10 MHz, PS = 128, NSCN = 8; Iext = 16.
6. Measured with a 20 pF electrode, reference oscillator frequency of 10 MHz, PS = 128, NSCN = 2; Iext = 16.
7. Measured with a 20 pF electrode, reference oscillator frequency of 10 MHz, PS = 16, NSCN = 3; Iext = 16.
8. Sensitivity defines the minimum capacitance change when a single count from the TSI module changes, it is equal to (C
9. Time to do one complete measurement of the electrode. Sensitivity resolution of 0.0133 pF, PS = 0, NSCN = 0, 1
10. REFCHRG=0, EXTCHRG=4, PS=7, NSCN=0F, LPSCNITV=F, LPO is selected (1 kHz), and fixed external capacitance of
7 Dimensions
72
MaxSens
Pres100
I
Symbol
f
f
V
Pres20
V
TSI_RUN
T
I
REFmax
ELEmax
Pres5
C
TSI_LP
* I
configuration: Iext = 5 μA, EXTCHRG = 4, PS = 128, NSCN = 2, I
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
electrode, EXTCHRG = 15.
C
DELTA
I
I
Res
20 pF. Data is captured with an average of 7 periods window.
DDTSI
Con20
REF
ELE
REF
ELE
ext
)/( I
ref
Operating voltage
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
Electrode capacitance measurement precision
Electrode capacitance measurement precision
Maximum sensitivity
Resolution
Response time @ 20 pF
Current added in run mode
Low power mode current adder
Description
* PS * NSCN). Sensitivity depends on the configuration used. The typical value listed is based on the following
• 1uA setting (REFCHRG=0)
• 32uA setting (REFCHRG=31)
• 1uA setting (EXTCHRG=0)
• 32uA setting (EXTCHRG=31)
ext
= 1 μA, EXTCHRG = 0, PS = 128, NSCN = 32, I
K61 Sub-Family Data Sheet Data Sheet, Rev. 3, 2/2012.
Table 51. TSI electrical specifications
Preliminary
0.003
TBD
TBD
1.71
Min.
—
—
—
—
—
—
—
—
—
—
—
—
1
8
ref
= 16 μA, REFCHRG = 15, C
8.3333
8.3333
8.3333
ref
1.133
1.133
12.5
Typ.
600
0.5
1.3
20
36
36
15
55
—
—
8
1
= 32 μA, REFCHRG = 31, C
Max.
TBD
TBD
TBD
TBD
TBD
38.4
38.4
38.4
500
3.6
1.5
1.5
50
50
16
25
—
—
Freescale Semiconductor, Inc.
ref
= 1.0 pF. The minimum
pF/count
pF/count
pF/count
fF/count
MHz
MHz
Unit
bits
mV
μA
μA
μA
μA
pF
pF
μs
V
ref
= 0.5 pF
Notes
2,
2,
10
1
2
2
2
5
6
7
8
9
3
4
ref