CAP1028 datasheet(69/71 Pages) SMSC

69 / 71 page

8 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

SMSC CAP1028

Revision 1.1 (08-05-09)

DATASHEET

Chapter 7 Revision History

Table 7.1 Customer Revision History

REVISION LEVEL & DATE

SECTION/FIGURE/ENTRY

CORRECTION

Rev. 1.1 (08-05-09)

Features

“TBD” replaced with “3uA” under Low Power

Operation

General Description

Deep sleep drawing “5uA” of current changed to

“3uA”

Chapter 1, Pin Description

Application Note added: “The SPI_CS# pin should

be grounded when SMBus, I2C, or BC-Link

communications are used.”

Pin description table updated: Added to pin

function description for RESET pin: “This pin

contains an internal 50uA pull-down current.”

Table 2.2, "Electrical

Specifications"

Table updated:

- Current Measurement, ISTBY - changed the

typical column to 160, max to 210. Changed the

conditions to read: " Standby state active, one

sensor monitored, no LED active, default

conditions (8 avg, 70ms cycle time)"

- Current Measurement, IDSLEEP -changed the

TYP column value to 3 and max to 10.

- Base Capacitance Line - changed the name to

"Maximum Base Capacitance". Removed the value

in the MIN column and MAX column. Added 50 in

the TYP column.

Section 3.1.1, "SMBus (I2C)

Communications"

The following text deleted: “The SPI_CS# pin is not

used and any data presented to this pin will be

ignored.”

and replaced with an application note: “For

SMBus/I2C communications, the SPI_CS# pin is

not used and should be grounded; any data

presented to this pin will be ignored.”

Section 3.1.3, "BC-Link

Communications"

The following application note added: “For BC-Link

communications, the SPI_CS# pin is not used and

should be grounded; any data presented to this pin

will be ignored.”

Table 3.1, "ADDR_COMM

Pin Decode"

Modified table heading, “Pull-Down Resistor” by

adding “(+/- 5%)”

Section 5.28, "LED Pulse 1

Period Register",

Section Table 5.45, "LED

Pulse / Breathe Period

Example" and

Section 5.30, "LED Breathe

Period Register"

Table 5.51, "LED Duty Cycle

Decode"

Added note describing limitation on operation

Updated table for Min and Max columns

CAP1028 Datasheet(PDF) 69 Page - SMSC Corporation

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