
5 ELECTRICAL SPECIFICATIONS
5.1 ABSOLUTE MAXIMUM SPECIFICATIONS
Operating temp................................................................................. as designated by suffix
Storage temp........................................................................................ -65
O
C to +150
O
C
V
DD
...................................................................................................... -0.5 to +6V
Max continuous pin current, any control or drive pin.............................................................. ±40mA
Short circuit duration to ground, any pin.......................................................................... infinite
Short circuit duration to V
DD
, any pin............................................................................. infinite
Voltage forced onto any pin................................................................... -0.5V to (Vdd + 0.5) Volts
5.2 RECOMMENDED OPERATING CONDITIONS
V
DD
..................................................................................................... +1.8 to 5.5V
V
DD
during eeprom writes................................................................................. +2.2 to 5.5V
Short-term supply ripple+noise.................................................................................. ±5mV
Long-term supply stability..................................................................................... ±100mV
Cs value................................................................................................ 1nF to 200nF
Cx value.................................................................................................. 0 to 100pF
5.3 AC SPECIFICATIONS
Vdd = 3.0, Ta = recommended operating range,
Cs=100nF
unless noted
μs
15
Heartbeat pulse width
T
HB
Cs = 10nF to 200nF; Cx = 0
ms
25
0.5
Burst length
T
BL
μs
1
Transfer duration
T
PT
μs
1
Charge duration
T
PC
Cs, Cx dependent
ms
150
Recalibration time
T
RC
Notes
Units
Max
Typ
Min
Description
Symbol
5.4 SIGNAL PROCESSING
secs
infinite
<1
Post-detection recalibration timer duration
ms/bit
-
Negative drift compensation rate
ms/bit
-
Positive drift compensation rate
samples
256
1
Consensus filter length
counts
15
0
Hysteresis w.r.t. threshold
counts
16
1
Threshold differential w.r.t. reference
Notes
Units
Max
Typ
Min
Description
Symbol
5.5 DC SPECIFICATIONS
Vdd = 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted
Threshold = 6; ref. Figure 5-4
pF
0.6
Sensitivity range, Channel 2
S2
Threshold = 6; ref. Figure 5-3
pF
0.4
Sensitivity range, Channel 1
S1
bits
16
Acquisition resolution
A
R
pF
200
0
Load capacitance range
C
X
OUT1, OUT2, 2mA sink
V
0.4
Low output voltage
V
OL
Vdd = 2.5 to 5.0V
V
0.6 Vdd
Input high voltage
V
IH
Vdd = 2.5 to 5.0V
V
0.3 Vdd
Input low voltage
V
IL
Required for proper start-up
V/s
100
Supply turn-on slope
V
DDS
Depends on setting of Sleep Cycles
μA
1,500
600
60
Supply current
I
DD
V
5.25
2.2
Vdd during eeprom write
V
DDW
V
5.25
1.8
Supply voltage
V
DD
Notes
Units
Max
Typ
Min
Description
Symbol
l
Q
13
QT320/R1.03 08/02