CAP1128 datasheet(50/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 50

 2015 Microchip Technology Inc.

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 6.5).

6.25

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 CAP1128Family LED Configuration Options for more information about implementing LEDs.

Bit 1 - LED2_OT - Determines the output type of the LED2 pin.

• ‘0’ (default) - The LED2 pin is an open-drain output with an external pull-up resistor. When the appropriate pin is

set to the “active” state (logic ‘1’), the pin will be driven low. Conversely, when the pin is set to the “inactive” state

(logic ‘0’), then the pin will be left in a High Z state and pulled high via an external pull-up resistor.

• ‘1’ - The LED2 pin is a push-pull output. When driving a logic ‘1’, the pin is driven high. When driving a logic ‘0’, the

pin is driven low.

Bit 0 - LED1_OT - Determines the output type of the LED1 pin.

6.26

Sensor Input LED Linking Register

The Sensor Input LED Linking register controls whether a capacitive touch sensor input is linked to an LED output. If

the corresponding bit is set, then the appropriate LED output will change states defined by the LED Behavior controls

(see Section 6.31) in response to the capacitive touch sensor input.

Bit 1 - CS2_LED2 - Links the LED2 output to a detected touch on the CS2 sensor input. When a touch is detected, the

LED is actuated and will behave as determined by the LED Behavior controls.

• ‘0’ (default) - The LED 2 output is not associated with the CS2 input. If a touch is detected on the CS2 input, the

LED will not automatically be actuated. The LED is enabled and controlled via the LED Output Control register

(see Section 6.28) and the LED Behavior registers (see Section 6.31).

• ‘1’ - The LED 2 output is associated with the CS2 input. If a touch is detected on the CS2 input, the LED will be

actuated and behave as defined in Table 6-52.

Bit 0 - CS1_LED1 - Links the LED1 output to a detected touch on the CS1 sensor input. When a touch is detected, the

LED is actuated and will behave as determined by the LED Behavior controls.

6.27

LED Polarity Register

The LED Polarity register controls the logical polarity of the LED outputs. When these bits are set or cleared, the corre-

sponding LED Mirror controls are also set or cleared (unless the BLK_POL_MIR bit is set - see Section 6.6, "Configu-

ration Registers"). Table 6-48, "LED Polarity Behavior" shows the interaction between the polarity controls, output

controls, and relative brightness.

TABLE 6-44:

LED OUTPUT TYPE REGISTER

ADDR

R/W

Default

71h

R/W

LED Output

Type

LED2_

LED1_

00h

TABLE 6-45:

SENSOR INPUT LED LINKING REGISTER

ADDR

R/W

Default

72h

R/W

Sensor Input

LED Linking

---

CS2_

LED2

CS1_

LED1

00h

TABLE 6-46:

LED POLARITY REGISTER

ADDR

R/W

Default

73h

R/W

LED Polarity

LED2_

POL

LED1_

POL

00h

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