GOODIX CONFIDENTIAL
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7. Host System Driver Modification in Gesture Mode
7.1 Enter Gesture mode after screen-off
a) If screen-off is achieved by pressing Power key (or any other key), send Command 8 to 0x8046, then to
0x8040;
b) If screen-off is achieved due to timeout, send Command 8 to 0x8046, then to 0x8040;
c) When the screen is off, if there is swipe, double-tap or writing of specified lower-case letters on TP, the
INT pin will output a high level or a pulse that is greater than 250us to notify the host. The host reads the
data at 0x814B after receiving such pulse. If the data meets wake-up conditions, the host wakes up, then
resets GT911 and turns on the screen. Otherwise, the host resets 0x814B and waits for the next pulse or high
level.
7.2 Enter Sleep Mode after screen-off
a) If screen-off is achieved by pressing Power key (or any other key), send Command 5 to 0x8040 ;
b) If screen-off is achieved due to timeout, send Command 5 to 0x8040 ;
c) In Sleep mode, host can be awakened only by pressing Power key (or Home key).
7.3 Press Power (or Home) key to wake up host
Press power key (or Home key) in any mode to wake up the host. And then, host resets GT911 based on
reset timing sequence and executes reset process.
7.4 Recommended to apply in conjunction with IR
If gesture wake-up function is applied in conjunction with IR, the host can enable GT911 to enter Sleep
mode to reduce power consumption when IR detects shielding object while screen-off. Otherwise, GT911
enters Gesture mode. To enter different modes, use the methods listed above (reset is required before
sending command).
7.5 Hardware circuit modification
When debugging, connect RC circuit to INT pin in series (R: 680 , C: 1nF) as shown below:
C
B
R1
INT
C1
Connect B to GT911 INT and C to host INT; pull-up resistor connected to host INT is not required.
