sx8675iwltrt Semtech Corporation, sx8675iwltrt Datasheet - Page 53

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

ADVANCED COMMUNICATIONS & SENSING
Bits
7:0
Bits
7:6
5:4
3:0
Bits
7:0
Bits
7:0
Rev 1 – 25
5:4
3:0
PROXHYST
PROXSCANPERIOD
Variable
PROXTHRESH
Variable
PROXCLOSEDEB
PROXFARDEB
PROXCOMPPRD
Variable
PROXSTUCK
Variable
PROXAVGPOSTHRESH
th
July 2011
Default
Default
Default
0000
0x00
0000
0x00
00
00
00
Default
0x00
Table 24 : RegProx0 (Addr 0x0B)
Table 25 : RegProx1 (Addr 0x0C)
Table 26 : RegProx2 (Addr 0x0D)
Table 27 : RegProx3 (Addr 0x0E)
Table 28 : RegProx4 (Addr 0x0F)
Defines the proximity detection hysteresis :
00 : OFF
01 : 32
10 : 128
11 : 512
Defines the proximity scan period :
0000 : OFF. Proximity sensing disabled
0001 : 1 / TOUCHRATE (Cf. RegTouch0)
0010 : 2 / TOUCHRATE
0011 : 4 / TOUCHRATE
0100 : 8 / TOUCHRATE
0101 : 16 / TOUCHRATE
0110 : 32 / TOUCHRATE
0111 : 64 / TOUCHRATE
1000 : 128 / TOUCHRATE
1001 : 256 / TOUCHRATE
1010 : 512 / TOUCHRATE
1011 : 1024 / TOUCHRATE
1100 : 2048 / TOUCHRATE
1101 : 4096 / TOUCHRATE
1110 : 8192 / TOUCHRATE
1111 : 16384 / TOUCHRATE
Description
Defines the proximity detection threshold (for PROXSTAT update).
Threshold = 16 x register value
Description
Defines the “Close” debounce (for PROXSTAT update):
00 : OFF
01 : 2 samples
10 : 4 samples
11 : 8 samples
Defines the “Far” debounce (for PROXSTAT update):
00 : OFF
01 : 2 samples
10 : 4 samples
11 : 8 samples
Defines the periodic compensation :
0 : OFF
Else : register value x 128 samples
Description
Defines the stuck at timeout (ie max “Close” time before a
compensation is automatically requested) :
0 : OFF
Else : register value x 16 samples
Description
Defines the average positive threshold (for compensation).
Threshold = 8 x register value
Resistive Touchscreen Controller with Proximity Sensing
53
SX8674/SX8675/SX8676
Haptics Enabled Multitouch 4/5-Wire
www.semtech.com