Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
Revision 1.32 (01-05-12) 14 SMSC CAP1188
DATASHEET
Supply Current
I
STBY
120 170 uA
Standby state active
1 sensor input monitored
No LEDs active
Default conditions (8 avg, 70ms
cycle time)
I
STBY
50 uA
Standby state active
1 sensor input monitored
No LEDs active
1 avg, 140ms cycle time,
I
DSLEEP
5 15 uA
Deep Sleep state active
LEDs at 100% or 0% Duty Cycle
No communications
T
A
< 40°C
3.135 < V
DD
< 3.465V
I
DD
500 600 uA
Capacitive Sensing Active
No LEDs active
Capacitive Touch Sensor Inputs
Maximum Base
Capacitance
C
BASE
50 pF Pad untouched
Minimum Detectable
Capacitive Shift
C
TOUCH
20 fF
Pad touched - default conditions
(1 avg, 35ms cycle time, 1x
sensitivity)
Recommended Cap
Shift
C
TOUCH
0.1 2 pF Pad touched - Not tested
Power Supply
Rejection
PSR ±3 ±10
counts
/ V
Untouched Current Counts
Base Capacitance 5pF - 50pF
Maximum sensitivity
Negative Delta Counts disabled
All other parameters default
Timing
RESET Pin Delay t
RST_DLY
10 ms
Time to
communications
ready
t
COMM_DLY
15 ms
Time to first
conversion ready
t
CONV_DLY
170 200 ms
LED Drivers
Duty Cycle DUTY
LED
0 100 % Programmable
Drive Frequency f
LED
2 kHz
Sinking Current I
SINK
24 mA V
OL
= 0.4
Sourcing Current I
SOURCE
24 mA V
OH
= V
DD
- 0.4
Table 2.2 Electrical Specifications (continued)
V
DD
= 3V to 3.6V, T
A
= 0°C to 85°C, all Typical values at T
A
= 27°C unless otherwise noted.
CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS