3 Channel Capacitive Touch Sensor with 3 LED Drivers
Datasheet
Table 2.2 Electrical Specifications (continued)
VDD = 3V to 3.6V, TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNIT
CONDITIONS
Supply Current
Standby state active
1 sensor input monitored
No LEDs active
ISTBY
120
170
uA
Default conditions (8 avg, 70ms
cycle time)
Standby state active
1 sensor input monitored
No LEDs active
ISTBY
50
uA
1 avg, 140ms cycle time,
Deep Sleep state active
LEDs at 100% or 0% Duty Cycle
No communications
IDSLEEP
5
15
uA
uA
TA < 40°C
3.135 < VDD < 3.465V
Capacitive Sensing Active
No LEDs active
IDD
500
600
Capacitive Touch Sensor Inputs
50
Maximum Base
Capacitance
CBASE
pF
Pad untouched
Pad touched - default conditions
(1 avg, 35ms cycle time, 1x
sensitivity)
Minimum Detectable
Capacitive Shift
ΔCTOUCH
20
fF
Recommended Cap
Shift
ΔCTOUCH
0.1
2
pF
Pad touched - Not tested
Untouched Current Counts
Base Capacitance 5pF - 50pF
Maximum sensitivity
Negative Delta Counts disabled
All other parameters default
Power Supply
Rejection
counts
/ V
PSR
±3
±10
Timing
Time to
communications
ready
tCOMM_DLY
15
ms
ms
Time to first
conversion ready
tCONV_DLY
170
200
LED Drivers
100
Duty Cycle
DUTYLED
fLED
0
%
Programmable
Drive Frequency
Sinking Current
Sourcing Current
2
kHz
mA
mA
ISINK
24
24
VOL = 0.4
ISOURCE
VOH = VDD - 0.4
SMSC CAP1133
Revision 1.32 (01-05-12)
DATAS11HEET
SMSC [ SMSC CORPORATION ]
