SX8650 Datasheet, PDF (39/56 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
4.10. Power-Up
The NIRQ pin is kept low during SX8650 power-up.
During power-up, the SX8650 is not accessible and I2C communications are ignored.
As soon as NIRQ rises, the SX8650 is ready for I2C communication.
voltage
VDD
VDD/2
time
voltage
NIRQ
t _POR
4.11. Reset
time
Figure 33. Power-up, NIRQ
The POR of the SX8650 will reset all registers and states of the SX8650 at power-up.
Additionally the host can reset the SX8650 by asserting the NRST pin (active low) and via the I2C bus.
If NRST is driven LOW, then NIRQ will be driven low by the SX8650. When NRST is released (or set to high) then NIRQ
will be released by the SX8650.
The circuit has also a soft reset capability. When writing the code 0xDE to the register I2CRegSoftReset, the circuit will be
reset.
ACS Revision V2.15/October 2009
©2009 Semtech Corp.
Page 38
www.semtech.com