CAP1128 datasheet(68/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 68

 2015 Microchip Technology Inc.

APPENDIX A:

DEVICE DELTA

A.1

Delta from CAP1028 to CAP1128

Updated circuitry to improve power supply rejection.

Updated LED driver duty cycle decode values to have more distribution at lower values - closer to a logarithmic

curve. See Table 6-60, "LED Duty Cycle Decode".

Updated bug that breathe periods were not correct above 2.6s. This includes rise / fall time decodes above 1.5s.

Added filtering on RESET pin to prevent errant resets.

Updated controls so that the RESET pin assertion places the device into the lowest power state available and

causes an interrupt when released. See Section 5.2, "RESET Pin".

Added 1 bit to the LED Off Delay register (see Section 6.38, "LED Off Delay Register") to extend times from 2s

to 5s in 0.5s intervals.

Breathe behavior modified. A breathe off delay control was added to the LED Off Delay Register (see Section

6.38, "LED Off Delay Register") so the LEDs can be configured to remain inactive between breathes.

Added controls for the LED transition effects when linking LEDs to capacitive sensor inputs. See Section 6.29,

"Linked LED Transition Control Register".

Added controls to “mirror” the LED duty cycle outputs so that when polarity changes, the LED brightness levels

look right. These bits are automatically set when polarity is set. Added control to break this auto-set behavior.

See Section 6.30, "LED Mirror Control Register".

10. Added Multiple Touch Pattern detection circuitry. See Section 6.15, "Multiple Touch Pattern Configuration Regis-

ter".

11. Added General Status register to flag Multiple touches, Multiple Touch Pattern issues and general touch detec-

tions. See Section 6.2, "Status Registers".

12. Added bits 6 and 5 to the Recalibration Configuration register (2Fh - see Section 6.17, "Recalibration Configura-

tion Register"). These bits control whether the accumulation of intermediate data and the consecutive negative

delta counts counter are cleared when the noise status bit is set.

13. Added Configuration 2 register for LED linking controls, noise detection controls, and control to interrupt on press

but not on release. Added control to change alert pin polarity. See Section 6.6, "Configuration Registers".

14. Updated Deep Sleep behavior so that device does not clear DSLEEP bit on received communications but will

wake to communicate.

15. Changed PWM frequency for LED drivers. The PWM frequency was derived from the programmed breathe

period and duty cycle settings and it ranged from ~4Hz to ~8000 Hz. The PWM frequency has been updated to

be a fixed value of ~2000Hz.

16. Register delta:

Table A.1 Register Delta From CAP1028 to CAP1128

Address

Delta

Default

00h

Page 31

Changed - Main Status /

Control

added bits 7-6 to control gain

00h

02h

Page 32

New - General Status

new register to store MTP, MULT, LED,

RESET, and general TOUCH bits

00h

44h

Page 36

New - Configuration 2

new register to control alert polarity, LED

touch linking behavior, LED output behav-

ior, and noise detection, and interrupt on

release

40h

24h

Page 39

Changed - Averaging

Control

updated register bits - moved

SAMP_AVG[2:0] bits and added SAMP_-

TIME bit 1. Default changed

39h

2Bh

Page 43

New - Multiple Touch

Pattern Configuration

new register for Multiple Touch Pattern

configuration - enable and threshold set-

tings

80h

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