sx8675iwltrt Semtech Corporation, sx8675iwltrt Datasheet - Page 52

• Manufacturer Part Number: sx8675iwltrt
• Description: Haptics Enabled Multitouch 4/5-wire Resistive Touchscreen Controller With Proximity Sensing
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
Bits
Bits
Bits
Bits
Bits
Rev 1 – 25
7:0
7:5
2:0
7:0
7:0
4
3
7
6
Variable
HAPTAMP
Variable
HAPTBW
HAPTHZ
HAPTSHORTPROT
HAPTTIMERMSB
Variable
HAPTTIMERLSB
Variable
Reserved
Variable
PROXRAWFILTSEL
PROXIRQSEL
th
July 2011
Default
Default
Default
Default
Default
0x00
0x00
0x00
100
000
0
0
0
0
Table 23 : RegHapt5 (Addr 0x0A)
Table 20 : RegHapt2 (Addr 0x07)
Table 21 : RegHapt3 (Addr 0x08)
Table 22 : RegHapt4 (Addr 0x09)
Description
Defines the haptics output polarity and level in I2C mode i.e.
AmplitudeCode (Cf. § 6) :
0xFF : +127 (Max positive)
…
0x81 : +1
0x80 : +0
0x00 : -0
0x01 : -1
…
0x7F : -127 (Max negative)
HAPTAMP[7] gives the sign of AmplitudeCode (1=>+;0=>-) while
HAPTAMP[6:0] give its magnitude.
Description
Defines the haptics low-pass filter cut off frequency (Hz):
000 : OFF. No filtering.
001 : ~210 * SamplingFreq / 100
010 : ~280 * SamplingFreq / 100
011 : ~425 * SamplingFreq / 100
100 : ~565 * SamplingFreq / 100
101 : ~700 * SamplingFreq / 100
110 : ~850 * SamplingFreq / 100
111 : ~980 * SamplingFreq / 100
SamplingFreq is VMOUT_Freq in LRA mode and MIN_Freq (PWM) or
FOSCL (I2C) in ERM mode (Cf. § 6)
Sets MOUTP and MOUTN to high impedance (HZ):
0 : Normal
1 : HZ
Disables short-circuit protection:
0 : ON . A short-circuit event will automatically stop haptics operation.
1 : OFF. A short-circuit event will not stop haptics operation.
In both cases HAPTSHORTSTAT is still updated (and hence an
interrupt can still be generated if needed)
Defines the haptics timer overflow value used to generate the LRA’s
128 or 256 multiple frequency from MIN.
Description
Defines the haptics timer overflow value used to generate the LRA’s
128 or 256 multiple frequency from MIN.
HAPTTIMER[9:0] values below 8 (ie 0-7) are reserved.
Description
Description
Defines the proximity raw filtering range for PROXRAWFILT :
0 : Fast
1 : Slow
Defines the function of bits 5 of RegIrqMsk and RegIrqSrc.
0 : ProxFar
1 : ProxConvDone
Resistive Touchscreen Controller with Proximity Sensing
52
SX8674/SX8675/SX8676
Haptics Enabled Multitouch 4/5-Wire
www.semtech.com