SX8650 Datasheet, PDF (37/56 Pages) Semtech Corporation – World’s Lowest Power & Smallest Footprint 4-wire Resistive Touchscreen Controller with 15kV ESD

SX8650
World’s Lowest Power & Smallest Footprint 4-wire
Resistive Touchscreen Controller with 15kV ESD
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
register
bits default
description
7:4
0 reserved
Settling time while filtering (± 10%)
When filtering is enabled, the channel will initially bias for a time of
POWDLY for the first conversion, and for a time of SETDLY for each
subsequent conversion in a filter set.
I2CRegCtrl2
3:0 0000 SETDLY
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
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
7
1 XCONV
0: no sample
1: sample, report X channel
6
1 YCONV
0: no sample
1: sample, report Y channel
5
0 Z1CONV
0: no sample
1: sample, report Z1 channel
I2CRegChanMsk ⁴
0 Z2CONV
0: no sample
1:sample, report Z2 channel
3
0 AUXCONV
0: no sample
1: sample, report AUX channel
0
0 reserved
0
0 reserved
I2CRegStat
0
0 reserved
The host status reading allows the host to read the status of the SX8650. The data goes from the SX8650
towards the host. Host writing to this register is ignored.
7
0 CONVIRQ
0: no IRQ pending
1: End of conversion sequence IRQ pending
IRQ is cleared by the I2C channel reading
6
0 PENIRQ
operational in pen detect mode
0: no IRQ pending
1: Pen detected IRQ pending
IRQ is cleared by the I2C status reading
5:0 000000 reserved
I2CRegSoftReset ^7:0
0x00 If the host writes the value 0xDE to this register, then the SX8650 will be reset.
Any other data will not affect the SX8650
Table 9. I2C registers
ACS Revision V2.15/October 2009
©2009 Semtech Corp.
Page 36
www.semtech.com