SX8674ICSTRT datasheet(51/64 Pages) SEMTECH

51 / 64 page

ADVANCED COMMUNICATIONS & SENSING

Rev 1 – 25

th July 2011

www.semtech.com

SX8674/SX8675/SX8676

Haptics Enabled Multitouch 4/5-Wire

Resistive Touchscreen Controller with Proximity Sensing

6:5

HAPTTYPEEN

Defines the haptics load:

00 : OFF. Haptics block disabled.

01 : LRA

10 : ERM

11 : Reserved

HAPTRANGE

Defines MIN prescaler value:

0 : 128

1 : 256

3:0

HAPTGAIN

0000

Defines the haptics output gain:

0000 : 1

0001 : ~1.17

0010 : ~1.34

0011 : ~1.51

0100 : ~1.67

0101 : ~1.84

0110 : ~2.01

0111 : ~2.18

1000 : ~2.35

1001 : ~2.52

1010 : ~2.69

1011 : ~2.86

1100 : ~3.03

1101 : ~3.20

1110 : ~3.37

1111 : ~3.53

Exact formula is 1 + Code * 0.169

Table 18 : RegHapt0 (Addr 0x05)

Bits

Variable

Default

Description

7:6

Reserved

5:3

HAPTSQUELCH

000

Defines the Haptics squelch, i.e. the range of AmplitudeCode

(HAPTAMP or MIN duty cycle equivalent, Cf. §6) which will generate a

0V output (VMOUT):

000 : OFF. No squelch.

001 : -1 < AmplitudeCode < +1 (ie. AmplitudeCode = 0)

010 : -2 < AmplitudeCode < +2

011 : -4 < AmplitudeCode < +4

100 : -8 < AmplitudeCode < +8

101 : -16 < AmplitudeCode < +16

110 : -32 < AmplitudeCode < +32

111 : -64 < AmplitudeCode < +64

TEMPWRNIRQEDG

Enables TempWrnIrq to be generated when the chip temperature gets

below the alarm threshold :

0 : OFF. TempWrnIrq generated only when the chip temperature gets

above the alarm threshold.

1 : ON. TempWrnIrq generated both when the chip temperature gets

above and below the alarm threshold.

TEMPALRMIRQEDG

Enables TempAlrmIrq to be generated when the chip temperature gets

below the alarm threshold :

0 : OFF. TempAlrmIrq generated only when the chip temperature gets

above the alarm threshold.

1 : ON. TempAlrmIrq generated both when the chip temperature gets

above and below the alarm threshold.

TEMPALWAYSON

Enables the temperature monitoring even when no operation (touch,

proximity, haptics) is enabled:

0 : OFF

1 : ON

Table 19 : RegHapt1 (Addr 0x06)

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