CAP1028 datasheet(35/71 Pages) SMSC

35 / 71 page

8 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

SMSC CAP1028

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 CAP1028. If the CAP1028

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

94h

R/W

LED Direct Ramp

Rates

Determines the rising and falling

edge ramp rates of the LEDs

00h

Page 63

95h

R/W

LED Off Delay

Determines the off delay for all LED

behaviors

00h

Page 64

FDh

Product ID

Stores a fixed value that identifies

each product

42h

Page 65

FEh

Manufacturer ID

Stores a fixed value that identifies

SMSC

5Dh

Page 65

FFh

Revision

Stores a fixed value that represents

the revision number

81h

Page 65

Table 5.2 Main Status Control Register

ADDR

R/W

DEFAULT

00h

R/W

Main Status

Control

STBY

DSLEEP

INT

00h

Table 5.1 Register Set in Hexadecimal Order (continued)

ADDRESS

R/W

FUNCTION

DEFAULT

VALUE

PAGE

CAP1028 Datasheet(PDF) 35 Page - SMSC Corporation

CAP1028 Datasheet(HTML) 35 Page - SMSC Corporation

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