SX8652ICSTRT Semtech, SX8652ICSTRT Datasheet - Page 22

• Manufacturer Part Number: SX8652ICSTRT
• Description: 4/5-wire Resistive Touch Screen Controller (SPI)
• Manufacturer: Semtech

6.3. Host Control Writing
Revision V1.6/July 2010
©2010 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
RegCtrl0
RegCtrl1
Register
Bits
7:4
3:0
7:6
3:2
1:0
5
4
Default
0000
0000
00
00
00
1
0
RATE
POWDLY
AUXAQC
CONDIRQ
SCREEN
RPDNT
FILT
Table 13. SX8652 Register
Set rate in coordinates per sec (cps) (± 20%)
If RATE equals zero then Manual mode.
if RATE is larger than zero then Automatic mode
0000: Timer disabled -Manual mode
0001: 10 cps
0010: 20 cps
0011: 40 cps
0100: 60 cps
0101: 80 cps
0110: 100 cps
0111: 200 cps
Settling time (± 10%): The channel will be biased for a time of POWDLY
before each channel conversion
0000: Immediate (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
00: AUX is used as an analog input
(4-wire only)
01: On rising AUX edge, wait
POWDLY and start acquisition
The AUX trigger works only in manual mode with 4-wire touchscreen
Enable conditional interrupts
0: interrupt always generated at end of conversion cycle. If no pen is
detected the data is set to ‘invalid qualified’.
1: interrupt generated when pen detect is successful
Select the type of screen:
0: 4-wire
1: 5 -wire
Select the Pen Detect Resistor
00: 100 kOhm
01: 200 kOhm
10: 50 kOhm
11: 25 kOhm
Digital filter control
00: Disable
01: 3 sample averaging
10: 5 sample averaging
11: 7 sample acquisition, sort, average 3 middle samples
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Page 22
Touchscreen Controller with SPI Interface
Description
1000: 300 cps
1001: 400 cps
1010: 500 cps
1011: 1k cps
1100: 2k cps
1101: 3k cps
1110: 4k cps
1111: 5k cps
1000: 0.14 ms
1001: 0.28 ms
1010: 0.57 ms
1011: 1.14 ms
1100: 2.27 ms
1101: 4.55 ms
1110: 9.09 ms
1111: 18.19 ms
10: On falling AUX edge, wait
POWDLY and start acquisition
11: On rising and falling AUX
edges, wait POWDLY and start
acquisition
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SX8652