BU21029GUL Datasheet, PDF (7/29 Pages) Rohm – 4-wire Resistive Touch Screen Controller

BU21029GUL
Datasheet
CF= 0000 : Automatic scan
This makes BU21029GUL periodically and automatically scan the screen and convert data upon detecting touch. When the
device cannot detect touch, it stops and stays in power down state until it detects the next pen-down. The order of scan
process is Z1, Z2, X and Y.
CF= 0001, 0110, 0111, 1011
No operation. (“PDM” and “STP” is valid.)
CF = 0010
This converts the voltage impressed to AUX. After the conversion has been completed, the device is powered
down according to the PDM setting.
CF= 0100 : Free scan mode
In Free Scan Mode, the driver state (X+, X-, Y+, Y-) and conversion input (X+, X-, Y+, Y-, AUX) can be selected through
register settings.
CF= 0101 : Calibration
This calibrates the parameters for dual touch detection. To activate the dual touch function, setting of CF to 0101 and
execution of the calibration command should be done after power-on.
CF= 1000, 1001, 1010: Drivers status control
This activates the analog circuit and panel driver corresponding to each command. BU21029GUL remains in this state until
it receives another SCAN instruction or until "STP" is set.
CF= 1100, 1101, 1110: Manual scan
This converts coordinates that correspond to each command. BU21029GUL goes to power-down state after a complete
conversion if "PDM" is set to "0". Otherwise, it stays at power-on state.
CF =0011, 1111
Reserved.
Bit D2：CMSK
0=Executes convert function.
1=Reads the convert result
Bit D1：PDM
Power Down Control
0= Powers down the device after converter function stops
1= Keeps power on after converter function stops
Bit D0：STP
1= Aborts currently running conversion and changes the state to power-down (STP is automatically set to “0”.)
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TSZ02201-0Y1Y0F300120-1-2
11.Nov.2013 Rev.002