CAP1006 datasheet(46/53 Pages) SMSC

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5 and 6 Channel Capacitive Touch Sensor

Datasheet

Revision 1.1 (08-05-09)

SMSC CAP1005 / CAP1006

DATASHEET

The Standby Threshold registers stores the delta threshold that is used to determine if a touch has

been detected. When a touch occurs, the input signal of the corresponding sensor changes due to the

capacitance associated with a touch. If the sensor input change exceeds the threshold settings, then

a touch is detected.

5.22

Sensor Base Count Registers

The Sensor 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 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).

APPLICATION NOTE:

5.23

Product ID Register

The Product ID register stores a unique 8-bit value that identifies the device.

Table 5.36 Sensor Base Count Registers

ADDR

R/W

DEFAULT

50h

Sensor 1 Base

Count

128

C8h

51h

Sensor 2 Base

Count

128

C8h

52h

Sensor 3 Base

Count

128

C8h

53h

Sensor 4 Base

Count

128

C8h

54h

Sensor 5 Base

Count

128

C8h

55h

Sensor 6 Base

Count

128

C8h

Table 5.37 Product ID Register

ADDR

R/W

DEFAULT

FDh

Product ID

CAP1006

01000100

44h

Product ID

CAP1005

01000101

45h

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