CAP1066 datasheet(35/71 Pages) SMSC

35 / 71 page

6 Channel Capacitive Touch Sensor with 6 LED Drivers

Datasheet

SMSC CAP1066

Revision 1.1 (08-05-09)

DATASHEET

During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when

power is first applied to the part and the voltage on the VDD supply surpasses the POR level as

specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to

undefined registers will not have an effect.

5.1

Main Status Control Register

The Main Status and Control register controls the primary power state of the device.

Bit 5 - STBY - Enables Standby.

‘0’ (default) - Sensor scanning is active and LEDs are functional.

‘1’ - Capacitive Touch Sensor scanning is limited to the sensors set in the Standby Channel register

(see Section 5.18). The status registers will not be cleared until read. LEDs that are linked to

Capacitive Touch sensors will remain linked and active. Sensors that are no longer sampled will

flag a release and then remain in a non-touched state. LEDs that are manually controlled will be

unaffected.

Bit 4 - DSLEEP - Enables Deep Sleep by deactivating all functions. This bit will be cleared when the

WAKE pin is driven high or when SPI or SMBus are received targeting the CAP1066. If the CAP1066

is configured to communicate using the BC-Link protocol, then this bit is ignored.

‘0’ (default) - Sensor scanning is active and LEDs are functional.

‘1’ - All sensor scanning is disabled and all LEDs are disabled. The status registers are

automatically cleared and the INT bit is cleared.

Bit 0 - INT - Indicates that there is an interrupt. This bit is only set if the ALERT# pin has been asserted.

If a channel detects a touch and its associated interrupt enable bit is not set to a logic ‘1’ then no

action is taken.

This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT# pin will be deasserted

and all status registers will be cleared if the condition has been removed. If the WAKE/SPI_MOSI pin

is asserted as a result of a touch detected while in Standby, it will likewise be deasserted when this

bit is cleared.

Note that this pin is not driven when communicating via the 4-wire SPI protocol

‘0’ - No interrupt pending.

‘1’ - A touch has been detected on one or more channels and the interrupt has been asserted.

5.2

Status Registers

Table 5.2 Main Status Control Register

ADDR

R/W

DEFAULT

00h

R/W

Main Status

Control

STBY

DSLEEP

INT

00h

Table 5.3 Status Registers

ADDR

R/W

DEFAULT

03h

Sensor Status

CS6

CS5

CS4

CS3

CS2

CS1

00h

04h

LED Status

LED6_

LED5_

LED4_

LED3_

LED2_

LED1_

00h

CAP1066 Datasheet(PDF) 35 Page - SMSC Corporation

CAP1066 Datasheet(HTML) 35 Page - SMSC Corporation

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