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TSZ02201-0L5L0F300720-1-2

© 2016 ROHM Co., Ltd. All rights reserved.

27.May.2016 Rev.002

www.rohm.com

TSZ22111 • 15 • 001

BU21028FV-M

CF= 0x0 (0000) : Automatic scan

This makes BU21028FV-M 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= 0x1 (0001), 0x6 (0110), 0x7 (0111), 0xB (1011)

No operation. (“PDM” and “STP” is valid.)

CF = 0x2 (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= 0x4 (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= 0x5 (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= 0x8 (1000), 0x9 (1001), 0xA (1010): Drivers status control

This activates the analog circuit and panel driver corresponding to each command. BU21028FV-M remains in this state until

it receives another SCAN instruction or until "STP" is set.

CF= 0xC (1100), 0xD (1101), 0xE (1110): Manual scan

This converts coordinates that correspond to each command. BU21028FV-M goes to power-down state after a complete

conversion if "PDM" is set to "0". Otherwise, it stays at power-on state.

CF =0x3 (0011), 0xF (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”.)