Sensors
8 Freescale Semiconductor
MC33794
Electrode Signals
Total Variance Between Electrode Measurements
(7)
All C
LOAD
= 15 pF
ELV
VAR
–
– 3.0
%
Electrode Maximum Harmonic Level Below Fundamental
(8)
5.0 pF ≤ C
LOAD
≤ 100 pF
EL
HARM
–
-20
–
dB
Electrode Transmit Output Range
5.0 pF ≤ C
LOAD
≤ 100 pF
EL
TXV
1.0 – 8.0
V
Receive Input Voltage Range
RX
V
0 – 9.0 V
Grounding Switch on Voltage
I
SW
= 1.0 mA
SW
VON
– – 5.0
V
Shield Driver
Shield Driver Output Level
0pF ≤ C
LOAD
≤ 500 pF
SD
TXV
1.0 – 8.0
V
Shield Driver Input Range
SD
IN
0 – 9.0 V
Grounding Switch on Voltage
(9)
SW
VON
– – 1.5 V
Logic I/O
CMOS Logic Input Low Threshold
V
THL
0.3 – – V
CC
Logic Input High Threshold
V
THH
– – 0.7 V
CC
Voltage Hysteresis
V
HYS
– 0.06 – V
CC
Input Current
V
IN
= V
CC
V
IN
= 0 V
I
IN
10
-5.0
–
–
50
5.0
µA
Signal Detector
Detector Output Resistance
DET
RO
– 50 – kΩ
LP_CAP to LEVEL Gain
A
REC
3.6 4.0 4.4 A
V
LP_CAP to LEVEL Offset
V
RECOFF
-3.3 -3.0 -2.7 V
Notes
7. Verified by design. Not tested in production.
8. Verified by design and characterization. Not tested in production.
9. Current into grounded terminal under test = 1.0 mA.
Table 3. Static Electrical Characteristics (continued)
Characteristics noted under conditions 9.0 V ≤ VPWR ≤ 18 V, -40°C ≤ T
A
≤ 85°C unless otherwise noted. Typical values noted
reflect the approximate parameter means at T
A
= 25°C under normal conditions unless otherwise noted. Voltages are relative
to GND unless otherwise noted.
Characteristic Symbol Min Typ Max Unit
