sx8675iwltrt Semtech Corporation, sx8675iwltrt Datasheet - Page 54

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

ADVANCED COMMUNICATIONS & SENSING
Bits
7:5
4:2
1:0
Bits
7:0
Bits
7:5
4:2
Rev 1 – 25
1
0
Variable
PROXAVGPOSDEB
PROXAVGPOSFILT
PROXRAWFILT
Variable
PROXAVGNEGTHRESH
Variable
PROXAVGNEGDEB
PROXAVGNEGFILT
PROXHIGHIM
Reserved
th
July 2011
Default
Default
000
000
000
000
00
0
0
Default
0x00
Table 29 : RegProx5 (Addr 0x10)
Table 30 : RegProx6 (Addr 0x11)
Table 31 : RegProx7 (Addr 0x12)
Description
Defines the average positive debounce (for compensation) :
000 : OFF
001 : 2 samples
010 : 4 samples
011 : 8 samples
100 : 16 samples
101 : 32 samples
110 : 64 samples
111 : 128 samples
Defines the average positive filter coefficient :
000 : 0 (ie filtering OFF)
001 : 1 – 1/2
010 : 1 – 1/4
011 : 1 – 1/8
100 : 1 – 1/16
101 : 1 – 1/32
110 : 1 – 1/64
111 : 1 – 1/128
Defines the raw filter coefficient.
If PROXRAWFILTSEL = 0 :
00 : 0 (ie filtering OFF)
01 : 1 – 1/2
10 : 1 – 1/4
11 : 1 – 1/8
If PROXRAWFILTSEL = 1 :
00 : 1 – 1/16
01 : 1 – 1/32
10 : 1 – 1/64
11 : 1 – 1/128
Description
Defines the average negative debounce (for compensation) :
000 : OFF
001 : 2 samples
010 : 4 samples
011 : 8 samples
100 : 16 samples
101 : 32 samples
110 : 64 samples
111 : 128 samples
Defines the average negative filter coefficient :
000 : 0 (i.e. filtering OFF)
001 : 1 – 1/2
010 : 1 – 1/4
011 : 1 – 1/8
100 : 1 – 1/16
101 : 1 – 1/32
110 : 1 – 1/64
111 : 1 – 1/128
Enables high noise immunity mode :
0 : OFF
1 : ON, at the expense of higher power consumption.
Description
Defines the average negative threshold (for compensation).
Threshold = – 8 x register value
Resistive Touchscreen Controller with Proximity Sensing
54
SX8674/SX8675/SX8676
Haptics Enabled Multitouch 4/5-Wire
www.semtech.com