CAP1014 datasheet(64/84 Pages) SMSC

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.65 (08-11-09)

SMSC CAP1014

DATASHEET

Bit 4 - LED5_DR - Determines whether LED5 output is driven high or low.

Bit 3 - LED4_DR - Determines whether LED4 output is driven high or low.

Bit 2 - LED3_DR - Determines whether LED3 output is driven high or low.

Bit 1 - LED2_DR - Determines whether LED2 output is driven high or low.

Bit 0 - LED1_DR - Determines whether LED1 output is driven high or low.

5.37.2

LED Output Control 2

Bit 2 - LED11_DR - Determines whether LED11 is active or not. This LED cannot be linked to a

Capacitive Touch Sensor.

‘0’ (default) - The LED11 output is in High Z and LED will be inactive.

‘1’ - The LED11 output is driven low and the LED will be active.

Bit 1 - LED10_DR - Determines whether LED10 is active or not. If this LED is linked to the Group of

sensors, then LED9 is automatically linked to the Group if sensors.

‘0’ (default) - The LED10 output is in High Z and LED will be inactive. If linked to the Group of

Capacitive Touch sensors, then it will remain inactive when actuated.

‘1’ - The LED10 output is driven low and the LED will be active. If linked to Group of Capacitive

Touch sensors, it will be in High-Z until it is actuated. At this point it will be driven low and the LED

will be active.

Bit 0 - LED9_DR - Determines whether LED9 is active or not.

‘0’ (default) - The LED9 output is in High Z and LED will be inactive. If linked to the Group of

Capacitive Touch sensors, then it will remain inactive when actuated.

‘1’ - The LED9 output is driven low and the LED will be active. If linked to Group of Capacitive

Touch sensors, it will be in High-Z until it is actuated. At this point it will be driven low and the LED

will be active.

5.38

LED Polarity Registers

The LED Polarity registers control the logical polarity of the LED outputs.

APPLICATION NOTE: The polarity controls determine the final LED pin drive. A touch on a linked Capacitive Touch

Sensor is treated in the same way as the LED Output Control bit being set to a logic ‘1’.

APPLICATION NOTE: For LED operation, the duty cycle settings determine the % of time that the LED pin will be

driven to a logic ‘1’ state in a non-inverted system or to a logic ‘0’ state in an inverted system.

The duty cycle settings operate independently of the polarity controls. Therefore, the Max

Duty Cycle settings define the maximum % of time that the LED pin will be driven high in a

non-inverted system while the Min Duty Cycle settings determine the minimum % of time that

the LED pin will be driven high in a non-inverted system.

Table 5.55 LED Polarity Registers

ADDR

R/W

DEFAULT

75h

R/W

LED Polarity

LED8_

POL

LED7_

POL

LED6_

POL

LED5_

POL

LED4_

POL

LED3_

POL

LED2_

POL

LED1_

POL

00h

76h

R/W

LED Polarity

LED11_

POL

LED10_

POL

LED9_

POL

00h

CAP1014 Datasheet(PDF) 64 Page - SMSC Corporation

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