Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
SMSC CAP1188 65 Revision 1.32 (01-05-12)
DATASHEET
5.24 Sensor Input Base Count Registers
The Sensor Input Base Count registers store the calibrated “Not Touched” input value from the
capacitive touch sensor inputs. These registers are periodically updated by the re-calibration routine.
The routine uses an internal adder to add the current count value for each reading to the sum of the
previous readings until sample size has been reached. At this point, the upper 16 bits are taken and
used as the Sensor Input Base Count. The internal adder is then reset and the re-calibration routine
continues.
The data presented is determined by the BASE_SHIFT[3:0] bits (see Section 5.5).
5.25 LED Output Type Register
The LED Output Type register controls the type of output for the LED pins. Each pin is controlled by
a single bit. Refer to application note 21.4 CAP1188 Family LED Configuration Options for more
information about implementing LEDs.
Table 5.43 Sensor Input Base Count Registers
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
50h R
Sensor Input 1
Base Count
128 64 32 16 8 4 2 1 C8h
51h R
Sensor Input 2
Base Count
128 64 32 16 8 4 2 1 C8h
52h R
Sensor Input 3
Base Count
128 64 32 16 8 4 2 1 C8h
53h R
Sensor Input 4
Base Count
128 64 32 16 8 4 2 1 C8h
54h R
Sensor Input 5
Base Count
128 64 32 16 8 4 2 1 C8h
55h R
Sensor Input 6
Base Count
128 64 32 16 8 4 2 1 C8h
56h R
Sensor Input 7
Base Count
128 64 32 16 8 4 2 1 C8h
57h R
Sensor Input 8
Base Count
128 64 32 16 8 4 2 1 C8h
Table 5.44 LED Output Type Register
ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT
71h R/W
LED Output
Type
LED8_
OT
LED7_
OT
LED6_
OT
LED5_
OT
LED4_
OT
LED3_
OT
LED2_
OT
LED1_
OT
00h