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BU21029GUL Datasheet(PDF) 6 Page - Rohm |
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BU21029GUL Datasheet(HTML) 6 Page - Rohm |
6 / 29 page 6/26 Datasheet Datasheet BU21029GUL TSZ02201-0Y1Y0F300120-1-2 © 2011 ROHM Co., Ltd. All rights reserved. 11.Nov.2013 Rev.002 www.rohm.co.jp TSZ22111・15・001 ●Host Interface Specification The BU21029GUL controller operates as an I2C slave device. At the start of the communication, it receives an address byte transmitted by the host processor and then then sends back an acknowledgement byte. The host processor can transmit a command to execute conversion or to access registers only after receiving the acknowledgement for the address byte. Communication ends when BU21029GUL receives a stop command. ●Address byte On the address byte, the slave address for 2-wire interface is written on the upper 7 bits and the READ/WRITE bit is written on the last bit. The upper six bits of the slave address are fixed to “100000” while the last bit is determined by the “AD0” input. Table 1. Serial Interface Slave Address Byte MSB D7 D6 D5 D4 D3 D2 D1 LSB D0 1 000 00 A0 R/W Bit D1: A0 Slave address bit0 (AD0) Bit D0: R/W 1=read (reading data) 0=write (writing data) ●Command byte The operation of BU21029GUL is dictated by the command byte. The host processor sets CID (D7) to 1 for conversion function or to 0 for register access. Table 2. Serial Interface Command Byte 1(CID=1) MSB D7 D6 D5 D4 D3 D2 D1 LSB D0 1CMSK PDM STP CF Bit D7: Command Byte ID 1= Command Byte 1(starts the conversion function determined by CF (Bit D6-D3) Bits D6-D4: CF Conversion function is selected as detailed below. Table 3. BU21029GUL Conversion Function List CF Description 0x0 Touch screen scan function: X, Y, Z1 and Z2 coordinates are converted. 0x1 NOP 0x2 Auxiliary input is converted. 0x3 Clipping value is changed. 0x4 Free scan function: Status of Driver and input of A/D is assigned by the Host. 0x5 Calibration: Parameters for dual touch detection are calibrated. 0x6 NOP 0x7 NOP 0x8 X+, X- driver status 0x9 Y+, Y- driver status 0xA Y+, X- driver status 0xB NOP 0xC Touch screen scan function: X coordinate is converted. 0xD Touch screen scan function: Y coordinate isconverted. 0xE Touch screen scan function: Z1 and Z2 coordinates are converted. 0xF Reserved |
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