3.4 SPI - What to Send
The host should execute the following commands after
powerup self-cal cycle has completed: (assuming a 50ms SPI
repetition rate):
1. 0x01 - Basic calibration (optional as this is done
automatically on power-up)
2. 0x8T - Set touch threshold (optional)
3. An endlessly repeating mixture of:
a. 0x00 (Null) - all commands except:
b. 0x03 (Drift compensate) - replace every nth Null
command where typically, n = 10
c. 0x04 (Error status) - use after any detection just
after a calibration or power-up to see if there is a
calibration error.
Note: the Null can be replaced by an empty /SS pulse if there
is no need for fast updates.
lQ
9
QT511-ISSG R6.01/1005
QUANTUM [ QUANTUM RESEARCH GROUP ]
