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ISL24211IRTZ-EVALZ Arkusz danych(PDF) 9 Page - Intersil Corporation |
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ISL24211IRTZ-EVALZ Arkusz danych(HTML) 9 Page - Intersil Corporation |
9 / 12 page ISL24211 9 FN7585.0 February 23, 2011 ISL24211 Programming The ISL24211 accepts I2C bus address and data when the WP pin is high. The ISL24211 ignores the I2C bus when the WP pin is low. Figure 10 shows the serial data format for writing the register and programming the EEPROM. Figure 11 shows the serial data format for reading the DAC register. Table 2 shows the truth table for reading and writing the device. Programming the EEPROM memory transfers the current DAC register value to the EEPROM and occurs when the control bits select the programming mode and the AVDD voltage is >10.8V. After the EEPROM programming cycle is started, the WP pin can be returned to logic low while the EEPROM write completes, which takes a maximum of 100ms. The ISL24211 uses a 6-bit I2C address, which is “100111yx” for the first transmitted byte. Bit x is the R/W bit, and Bit y is the LSB (D0) of the DCP register code to be written. The complete read and write protocol is shown in Figures 10 and 11. I2C Bus Signals The ISL24211 uses fixed voltages for its I2C thresholds, rather than the percentage of VDD described in the I2C specification (see Table 3). This should not cause a problem in most systems, but the I2C logic levels in a specific design should be checked to ensure they are compatible with the ISL24211. FIGURE 9. EEPROM PROGRAMMING FLOWCHART Erase Pulse Start EEPROM Programming Are EEPROM Cells Erased? No Yes Write Pulse Are EEPROM Cells Programmed? EEPROM Programming Complete No Yes TABLE 2. ISL24211 READ AND WRITE CONTROL WP PIN R/W P FUNCTION 0 1 X Read Register. 0 0 1 Will acknowledge I2C transactions. Will not write to register. 0 0 0 Will acknowledge I2C transactions. Will not write to EEPROM. 1 1 X Read DAC Register. 10 1 Write DAC Register. 10 0 Program EEPROM. TABLE 3. ISL24211 I2C BUS LOGIC LEVELS SYMBOL ISL24211 I2C STANDARD VIL_I2C 0.55V 0.3*VDD VIH_I2C 1.44V 0.7*VDD |
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