SX8650 Datasheet, PDF (38/56 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
4.9. Host Commands
The host can write to and read from registers of the SX8650 by the write and read commands as defined in Table 10.
W/R command name
CR(7:0)
Function
7
6
5
4
3
2
1
0
WRITE(RA)
0
0
0
RA(4:0)
Write register (see Table 8 for RA)
READ(RA)
0
1
0
RA(4:0)
Read register (see Table 8 for RA)
Table 10. I2C W/R commands
.The host can issue commands to change the operation mode or perform manual actions as defined in Table 11.
command name
CR(7:0)
Function
7
6
5
4
3
2
1
0
SELECT(CHAN)
1
0
0
0
x
CHAN(2:0)
Bias channel (see Table 12 for CHAN)
CONVERT(CHAN)
1
0
0
1
x
CHAN(2:0)
Bias channel (see Table 12 for CHAN)
Wait POWDLY settling time
Run conversion
MANAUTO
1
0
1
1
x
x
x
x Enter manual or automatic mode.
PENDET
1
1
0
0
x
x
x
x Enter pen detect mode.
PENTRG
1
1
1
0
x
x
x
x Enter pen trigger mode.
Table 11. I2C commands
The channels are defined as in Table 12.
Channel
X
Y
Z1
Z2
AUX
reserved
reserved
SEQ
CHAN(2:0)
Function
2
1
0
0
0
0 X channel
0
0
1 Y channel
0
1
0 First channel for pressure measurement
0
1
1 Second channel for pressure measurement
1
0
0 Auxiliary channel
1
0
1
1
1
0
1
1
1 Channel sequentially selected from
I2CRegChanMsk register, (see Table 8)
Table 12. channel definition
ACS Revision V2.15/October 2009
©2009 Semtech Corp.
Page 37
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