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SX8674ICSTRT датащи(PDF) 49 Page - Semtech Corporation |
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SX8674ICSTRT датащи(HTML) 49 Page - Semtech Corporation |
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49 / 64 page ![]() ADVANCED COMMUNICATIONS & SENSING Rev 1 – 25 th July 2011 49 www.semtech.com SX8674/SX8675/SX8676 Haptics Enabled Multitouch 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing Bits Variable Default Description 7:4 TOUCHRATE 0000 Defines the touch coordinates acquisition rate: 0000 : OFF. 0001 : 10 cps 0010 : 20 cps 0011 : 40 cps 0100 : 60 cps 0101 : 80 cps 0110 : 100 cps 0111 : 200 cps 1000 : 300 cps 1001 : 400 cps 1010 : 500 cps 1011 : 1 kcps 1100 : 2 kcps 1101 : 3 kcps 1110 : 4 kcps 1111 : 5 kcps Values above assume typical FOSCL, else vary accordingly. 3:0 POWDLY 0000 Defines the bias settling time for each channel’s first conversion: 0000 : 0.5 us 0001 : 1.1 us 0010 : 2.2 us 0011 : 4.4 us 0100 : 8.9 us 0101 : 17.8 us 0110 : 35.5 us 0111 : 71.0 us 1000 : 142 us 1001 : 284 us 1010 : 768 us 1011 : 1.14 ms 1100 : 2.27 ms 1101 : 4.75 ms 1110 : 9.09 ms 1111 : 18.19 ms Values above assume typical FOSCH, else vary accordingly. Table 13 : RegTouch0 (Addr 0x00) Bits Variable Default Description 7:5 Reserved 001 4 TSTYPE 0 Defines the type of touchscreen: 0 : 4-wire 1 : 5-wire 3:2 RPNDT 00 Defines the pen detection circuit’s pull-up resistor value: 00 : 114 kOhms 01 : 228 kOhms 10 : 57 kOhms 11 : 28 kOhms 1:0 FILT 00 Defines the channel filtering algorithm: 00 : OFF (Nfilt = 1) 01 : 3 sample averaging (Nfilt = 3) 10 : 5 sample averaging (Nfilt = 5) 11 : 3 sample averaging after removal of extreme values (Nfilt = 7) Table 14 : RegTouch1 (Addr 0x01) |
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