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AD7314ARMZ-REEL7 데이터시트(PDF) 6 Page - Analog Devices |
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AD7314ARMZ-REEL7 데이터시트(HTML) 6 Page - Analog Devices |
6 / 8 page REV. A AD7314 –6– Write Operation Figure 3 also shows the interface diagram for a serial write to the AD7314. The write operation takes place at the same time as the read operation. Data is clocked into the control register on the falling edge of SCLK. Only the third bit in the data stream provides a user-controlled function. This third bit is the power- down bit which, when set to a 1, puts the AD7314 into shutdown mode. The first two bits of the data stream are don’t cares while all other bits in the data stream other than the power-down bit should be 0 to ensure correct operation of the AD7314. Data is loaded into the control register on the 15th rising SCLK edge. The data takes effect at this time, i.e., if the part is programmed to go into shutdown, it does so at this point. If the CE is brought low before this 15th SCLK edge, the control register will not be loaded and the power-down status of the part will not change. MICROCONTROLLER INTERFACING The AD7314 serial interface allows for easy interface to most microcontrollers and microprocessors. A typical interface circuit is shown in Figure 4. AD7314* SCLK SDI SDO CE SCLK DOUT DIN CE CONTROLLER* *ADDITIONAL PINS OMITTED FOR CLARITY Figure 4. Typical Interface The ID pin of the AD7314 can be used to distinguish the device if used as a drop-in replacement temperature sensor. Connected to Pin 7 (ID pin) is a 1 k W internal pull-down resistor. If a pull-up resistor is used on Pin 7 to aid in identify- ing a device, then a pull-up value of 100 k W with VDD at 2.9 V nominal is recommended. Figure 5 shows the recommended pull-up resistor value for the ID pin. The recommended resistor value in Figure 5 minimizes the additional power the AD7314 has to dissipate, thus reducing any negative affects on the tem- perature sensor measurements. AD7314* CONTROLLER* *ADDITIONAL PINS OMITTED FOR CLARITY ID 2.9V 100k 1k Figure 5. Typical ID Pin Interface MOUNTING THE AD7314 The AD7314 can be used for surface or air temperature sensing applications. If the device is cemented to a surface with thermally conductive adhesive, the die temperature will be within about 0.1 ∞C of the surface temperature, thanks to the device’s low power consumption. Care should be taken to insulate the back and leads of the device from the air, if the ambient air tempera- ture is different from the surface temperature being measured. The ground pin provides the best thermal path to the die, so the temperature of the die will be close to that of the printed circuit ground track. Care should be taken to ensure that this is in good thermal contact with the surface being measured. As with any IC, the AD7314 and its associated wiring and cir- cuits must be kept free from moisture to prevent leakage and corrosion, particularly in cold conditions where condensation is more likely to occur. Water-resistant varnishes and conformal coatings can be used for protection. The small size of the AD7314 package allows it to be mounted inside sealed metal probes that provide a safe environment for the device. CE SCLK SDO SDI DON'T CARE DON'T CARE POWER- DOWN LEADING ZERO DB9 DB8 DB0 12 3 4 12 15 16 11 t4 t6 DATA-IN IS LOADED INTO CONTROL REGISTER ON THIS EDGE Figure 3. Serial Interface Diagram |
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