SX8652ICSTRT Semtech, SX8652ICSTRT Datasheet - Page 20

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

9.3. SPI Host Commands
.The host can issue commands to change the operation mode or perform manual actions as defined in Table 13.
9.4. SPI implementation and multiple Read/Write
The SPI implemented on the SX8652 is set to the common setting CPOL=0 and CPHA=0 which means data are sampled
on the rising edge of the clock, and shifted on the falling one.
The default state of the clock when NCS gets asserted is low. If a host send a command while the system is busy, the
command is discarded.
The SPI protocol is designed to be able to do multiple read/write during a transaction. During one single operation, as long
as NCS stay asserted, the register address is automatically increased to allow sequential read/write (or sequential retrieval
of data). Between each different operation though (READ/WRITE/READCHAN), the communication should be restarted.
This is described in Figure 17.
Revision V1.7/October 2010
©2010 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
command name
CONVERT(CHAN)
SELECT(CHAN)
MANAUTO
PENTRG
PENDET
7
1
1
1
1
1
6
0
0
0
1
1
5
0
0
1
0
1
Table 13.
4
0
1
1
0
0
CR(7:0)
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Page 20
3
x
x
x
x
x
Host Commands
Touchscreen Controller with SPI Interface
2
x
x
x
CHAN(2:0)
CHAN(2:0)
1
x
x
x
0
x
x
x
Bias channel (see Table 12 for CHAN)
Bias channel (see Table 12 for CHAN)
Enter manual or automatic mode.
Enter pen detect mode.
Enter pen trigger mode.
Function
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