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ISL45042IRZ 数据表(PDF) 7 Page - Intersil Corporation |
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ISL45042IRZ 数据表(HTML) 7 Page - Intersil Corporation |
7 / 9 page 7 FN6072.9 April 13, 2011 Power Supply Sequence The recommended power supply sequencing is shown in Figure 6. When applying power, VDD should be applied before or at the same time as AVDD. The minimum time for tVS is 0µs. When removing power, the sequence of VDD and AVDD is not important. Do not remove VDD or AVDD within 100ms of the start of the EEPROM programming cycle. Removing power before the EEPROM programming cycle is completed may result in corrupted data in the EEPROM. Verifying the Programmed Value The following sequence can be used to verify the programmed value without having to sequence the VDD supply. To verify the programmed value, follow the following steps. The ISL45042 will read memory contents and be set to that value when the CE pin is grounded. 1. Power-up the ISL45042. 2. CE pin = VDD. 3. Change counter value with CTL pin to desired value. 4. CTL = more than 4.9V and 200ms. Counter value programmed. 5. Change the counter value with CTL pin to a different value. 6. CE pin = Ground. 7. Check that the output value is the one programmed in Step 4. Generating VDD and CE supply from a Larger Voltage Source The CE pin has an internal pull-down resistor (see RINTERNAL in Figure 7). The impedance of this resistor is 400k Ω to 5MΩ. If your design is using a resistor divider network to generate the 3.3V supply (for both VDD and CE to enable programming) from a larger voltage source, the 400k Ω (worst case) resistor needs to be taken into account as a parallel resistance when the CE pin is connected to this source. Another design concern is to be able to provide enough supply current during programming. The ISL45042 draws about 2mA during this process. Recommended resistor values are shown in Figure 7. This design will result in an additional 0.83mA quiescent current flowing through resistors RA and RB. FIGURE 6. POWER SUPPLY SEQUENCE VDD AVDD tVS FIGURE 7. APPLICATION GENERATING VDD AND VCE VOLTAGES VCC = 5V SCHMITT TRIGGER CE LOGIC RINTERNAL = 400kΩ to 5MΩ RA RB 2k Ω 4k Ω ISL45042 CE VCE ISL45042 |
类似零件编号 - ISL45042IRZ |
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类似说明 - ISL45042IRZ |
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