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BUF08821 Datasheet(PDF) 10 Page - Texas Instruments |
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BUF08821 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 27 page SBOS438C – AUGUST 2008 – REVISED AUGUST 2009 ................................................................................................................................................. www.ti.com These are the steps of the sequence to initiate a 5. Send a STOP condition on the bus. general channel acquire: Approximately 36 μs (±4 μs) after issuing this 1. BKSEL should be stable throughout the time of a command, the specified DAC/VCOM register and general acquire. Be sure BKSEL is in its desired DAC/VCOM output voltage change to the appropriate state, has been stable for at least 20 μs, and that OTP memory value. any previous general acquire has had time to complete. MaxBank 2. Send a START condition on the bus. The BUF08821 can provide the user with the number 3. Send the appropriate device address (based on of times the nonvolatile memory of a particular A0) and the read/write bit = LOW. The BUF08821 DAC/VCOM channel nonvolatile memory has been acknowledges this byte. written to for the current memory bank. This 4. Send a DAC/VCOM pointer address byte. Set bit information is provided by reading the register at D7 = 1 and D6 = 0. Bits D5–D0 are any valid pointer address 111111. DAC/VCOM address. The BUF08821 There are two ways to update the MaxBank register: acknowledges, stores, and returns data only from 1. After initiating a single acquire command, the these addresses: BUF08821 updates the MaxBank register with a – 000000 through 000111 code corresponding to how many times that – 010010 particular channel memory has been written to. See Table 4 for valid DAC/VCOM addresses. 2. Following a general acquire command, the 5. Send a STOP condition on the bus. BUF08821 updates the MaxBank register with a code corresponding to the maximum number of Approximately 280 μs (±30 μs) after issuing this times the most used channel (OUT1–8 and VCOM) command, all DAC/VCOM registers and DAC/VCOM has been written to. output voltages change to the respective, appropriate nonvolatile memory values. MaxBank is a read-only register and is only updated by performing a general- or single-channel acquire. The general acquire command only updates storage registers for the selected bank based on the state of Table 3 shows the relationship between the number the BKSEL pin. To update both banks, it is necessary of times the nonvolatile memory has been to change the state of the BKSEL pin and issue programmed and the corresponding state of the another general acquire command. MaxBank Register. Single-Channel Acquire Command Table 3. MaxBank Details These are the steps to initiate a single-channel NUMBER OF TIMES WRITTEN TO RETURNS CODE acquire: 0 0000 1. BKSEL should be stable throughout the time of a 1 0000 single-channel acquire. Be sure BKSEL is in its 2 0001 desired state, has been stable for at least 20 μs, 3 0010 and that any previous single-channel acquire has 4 0011 had time to complete. 5 0100 2. Send a START condition on the bus. 6 0101 3. Send the device address (based on A0) and 7 0110 read/write bit = LOW. The BUF08821 8 0111 acknowledges this byte. 9 1000 4. Send a DAC/VCOM pointer address byte using the 10 1001 DAC/VCOM address corresponding to the output 11 1010 and register to update with the OTP memory 12 1011 value. Set bit D7 = 0 and D6 = 1. Bits D5–D0 are the DAC/VCOM address. The BUF08821 13 1100 acknowledges, stores, and returns data only from 14 1101 these addresses: 15 1110 – 000000 through 000111 16 1111 – 010010 See Table 4 for valid DAC/VCOM addresses. 10 Submit Documentation Feedback Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Link(s): BUF08821 |
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