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ISL24201 Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL24201 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 12 page ISL24201 9 FN7586.1 December 9, 2010 ISL24201 Programming The ISL24201 accepts I2C bus address and data when the WP pin is at or above VIH (>0.7VDD). The ISL24201 ignores the I2C bus when the WP pin is at or below VIL (<0.3VDD). Figure 13 shows the serial data format for writing the register and programming the EEPROM. Figure 14 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 while it completes, which takes a maximum of 100ms. The ISL24201 uses a 6 bit I2C address, which is “100111xx”. The complete read and write protocol is shown in Figures 13 and 14. I2C Bus Signals The ISL24201 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 ISL24201. ~1ms IP 100ms Max 2.7mA 200µA 50µA 90µA 25µA FIGURE 11. IDD AND IAVDD CURRENT PROFILE DURING EEPROM PROGRAMMING FIGURE 12. EEPROM PROGRAMMING FLOWCHART E rase P u ls e Sta rt EE P R O M P ro g ra mmin g Are EEPRO M Ce lls E ra s e d ? No Ye s W rite P u ls e Are EEPR O M C e lls P rog ra m m e d? EEPR O M P ro g ra mmin g Co m p le te No Ye s TABLE 2. ISL24201 READ AND WRITE CONTROL WP PIN I2C BITS FUNCTION R/W PROGRAM 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. ISL24201 I2C BUS LOGIC LEVELS SYMBOL ISL24201 I2C STANDARD I2CVIL 0.55V 0.3*VDD I2CVIH 1.44V 0.7*VDD |
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