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AD5242BRUZ100-RL7 Fiches technique(PDF) 15 Page - Analog Devices |
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AD5242BRUZ100-RL7 Fiches technique(HTML) 15 Page - Analog Devices |
15 / 20 page AD5241/AD5242 Rev. C | Page 15 of 20 ADDITIONAL PROGRAMMABLE LOGIC OUTPUT The AD5241/AD5242 feature additional programmable logic outputs, O1 and O2, that can be used to drive digital load, analog switches, and logic gates. They can also be used as a self-contained shutdown preset to Logic 0 that is further explained in the Shutdown Function section. O1 and O2 default to Logic 0 during power-up. The logic states of O1 and O2 can be programmed in Frame 2 under the write mode (see Figure 4). Figure 34 shows the output stage of O1, which employs large P-channel and N- channel MOSFETs in push-pull configuration. As shown in Figure 34, the output is equal to VDD or VSS, and these logic outputs have adequate current driving capability to drive milliamperes of load. IN 1 2 VDD O1 VSS MP MN O1 DATA IN FRAME 2 OF WRITE MODE Figure 34. Output Stage of Logic Output, O1 Users can also activate O1 and O2 in the following three different ways without affecting the wiper settings: 1. Start, slave address byte, acknowledge, instruction byte with O1 and O2 specified, acknowledge, stop. 2. Complete the write cycle with stop, then start, slave address byte, acknowledge, instruction byte with O1 and O2 specified, acknowledge, stop. 3. Do not complete the write cycle by not issuing the stop, then start, slave address byte, acknowledge, instruction byte with O1 and O2 specified, acknowledge, stop. All digital inputs are protected with a series input resistor and the parallel Zener ESD structures shown in Figure 36. This applies to the digital input pins, SDA, SCL, and SHDN. SHUTDOWN FUNCTION Shutdown can be activated by strobing the SHDN pin or programming the SD bit in the write mode instruction byte (see ). If the RDAC Register 1 or RDAC Register 2 (AD5242 only) is placed in shutdown mode by the software, SD bit, the part returns the wiper to its prior position when a new command is received. Table 2 In addition, shutdown can be implemented with the device digital output, as shown in Figure 35. In this configuration, the device is shutdown during power-up but users are allowed to program the device. Thus, when O1 is programmed high, the device exits shutdown mode and responds to the new setting. This self-contained shutdown function allows absolute shutdown during power-up, which is crucial in hazardous environments, and it does not add extra components. SDA SHDN SCL RPD O1 Figure 35. Shutdown by Internal Logic Output, O1 340 Ω LOGIC VSS Figure 36. ESD Protection of Digital Pins A,B,W VSS Figure 37. ESD Protection of Resistor Terminals |
Numéro de pièce similaire - AD5242BRUZ100-RL7 |
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Description similaire - AD5242BRUZ100-RL7 |
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