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BUF08832 Datasheet(PDF) 11 Page - Texas Instruments |
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BUF08832 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page BUF08832 www.ti.com SBOS476C – AUGUST 2009 – REVISED JULY 2011 Single-Channel Acquire Command When the BKSEL pin changes state, the BUF08832 acquires the last programmed DAC/VCOM values from These are the steps to initiate a single-channel the nonvolatile memory associated with this newly acquire: chosen bank. At power-up, the state of the BKSEL 1. Be sure BKSEL is in its desired state and has pin determines which memory bank is selected. been stable for at least 1ms. The I2C master also has the ability to update 2. Send a START condition on the bus. (acquire) the DAC registers with the last programmed 3. Send the device address (based on A0) and nonvolatile memory values using software control. read/write bit = LOW. The BUF08832 The bank to be acquired depends on the state of acknowledges this byte. BKSEL. 4. Send a DAC/VCOM pointer address byte using the General Acquire Command DAC/VCOM address corresponding to the output and register to update with the OTP memory A general acquire command is used to update all value. Set bit D7 = 0 and D6 = 1. Bits D5-D0 are registers and DAC/VCOM outputs to the last the DAC/VCOM address. Although the BUF08832 programmed values stored in nonvolatile memory. A acknowledges 000000 through 010111, it stores single-channel acquire command updates only the and returns data only from these addresses: register and DAC/VCOM output of the DAC/VCOM – 000000 through 000111 corresponding to the DAC/VCOM address used in the – 010010 single-channel acquire command. It returns 0000 reads from 001000 through These are the steps of the sequence to initiate a 010001, and 010011 through 010111. See general channel acquire: Table 4 for valid DAC/VCOM addresses. 1. Be sure BKSEL is in its desired state and has 5. Send a STOP condition on the bus. been stable for at least 1ms. Approximately 36 μs ( ±4μs) after issuing this 2. Send a START condition on the bus. command, the specified DAC/VCOM register and 3. Send the appropriate device address (based on DAC/VCOM output voltage change to the appropriate A0) and the read/write bit = LOW. The BUF08832 memory value. acknowledges this byte. 4. Send a DAC/VCOM pointer address byte. Set bit MaxBank D7 = 1 and D6 = 0. Bits D5-D0 are any valid The BUF08832 can provide the user with the number DAC/VCOM address. Although the BUF08832 of times the nonvolatile memory of a particular acknowledges 000000 through 010111, it stores DAC/VCOM channel nonvolatile memory has been and returns data only from these addresses: written to for the current memory bank. This – 000000 through 000111 information is provided by reading the register at – 010010 pointer address 111111. It returns 0000 for reads from 001000 through There are two ways to update the MaxBank register: 010001, and 010011 through 010111. See Table 4 for valid DAC/VCOM addresses. 1. After initiating a single acquire command, the BUF08832 updates the MaxBank register with a 5. Send a STOP condition on the bus. code corresponding to how many times that Approximately 750 μs ( ±80μs) after issuing this particular channel memory has been written to. command, all DAC/VCOM registers and DAC/VCOM 2. Following a general acquire command, the output voltages change to the respective, appropriate BUF08832 updates the MaxBank register with a nonvolatile memory values. code corresponding to the maximum number of times the most used channel (OUT1-8 and xxx VCOMs) has been written to. xxx MaxBank is a read-only register and is only updated by performing a general- or single-channel acquire. Copyright © 2009–2011, Texas Instruments Incorporated 11 |
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