sx8675iwltrt Semtech Corporation, sx8675iwltrt Datasheet - Page 40
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sx8675iwltrt
Manufacturer Part Number
sx8675iwltrt
Description
Haptics Enabled Multitouch 4/5-wire Resistive Touchscreen Controller With Proximity Sensing
Manufacturer
Semtech Corporation
Datasheet
1.SX8675IWLTRT.pdf
(64 pages)
- Current page: 40 of 64
- Download datasheet (3Mb)
ADVANCED COMMUNICATIONS & SENSING
7
The chip includes a temperature sensor which monitors the chip’s junction temperature. Its purpose is to provide
over-temperature information to the host and if needed automatically shutdown chip operation for thermal
protection.
If TEMPALWAYSON = 0 (default), the temperature sensor will perform measurements only if the chip is active
i.e.
(PROXSCANPERIOD != 0) or haptics interface enabled (HAPTTYPEEN != 00). The temperature sensor will
perform a measurement every ~32 ms (1024/FOSCL) but not during ADC conversions (temperature sensing
delayed accordingly).
If TEMPALWAYSON = 1, the temperature sensor will always perform a measurement every ~32 ms
independently from chip activity (i.e. also when the chip is inactive and during ADC conversions).
Each measurement is compared with two internally hard-coded thresholds:
Each of these thresholds is associated to a status flag (TEMPWARNINGSTAT, TEMPALARMSTAT) which
edges can be mapped to generate an interrupt to the host.
Additionally, during an alarm situation (i.e. temperature > alarm level) all chip operations (i.e. touchscreen,
proximity, haptics) are automatically shutdown until the temperature goes below the alarm level.
After a shutdown event all stored conversion data are thrown away. Cycling operations (TOUCHRATE > 0) will
resume from the start (i.e. if a 4 channel conversion is stopped during the 3
resuming, the 4 channels will be converted again). If the user was running some manual operation (SELECT,
CONVERT), the corresponding command will have to be re-issued. The haptics operations will resume directly.
Rev 1 – 25
T
touchscreen
EMPERATURE
Warning level: typ. 120° C (TWRNG).
Alarm level: typ. 155° C (TALRM)
th
July 2011
interface
S
ENSOR
running
Figure 51 – Temperature Sensor Overview
(Op.
Mode
Resistive Touchscreen Controller with Proximity Sensing
40
!=
MAN),
SX8674/SX8675/SX8676
proximity
Haptics Enabled Multitouch 4/5-Wire
sensing
rd
channel conversion, when
interface
www.semtech.com
enabled
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