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ADT7302ARMZ-REEL7 Datasheet(PDF) 10 Page - Analog Devices |
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ADT7302ARMZ-REEL7 Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page ADT7302 Rev. 0 | Page 10 of 16 –40°C –0.03125°C –30°C 11, 1111, 1111, 1111 11, 1100, 0100, 0000 11, 1011, 0000, 0000 TEMPERATURE (°C) 75°C 150°C 01, 0010, 1100, 0000 00, 1001, 0110, 0000 00, 0000, 0000, 0001 Figure 13. Temperature to Digital Transfer Function SCLK DOUT DIN POWER- DOWN LEADING ZEROS DB13 DB0 1 23 4 15 16 t1 t2 t3 t4 t6 t5 t7 t8 DB12 DB1 DB0 CS Figure 14. Serial Interface Timing Diagram SERIAL INTERFACE The serial interface on the ADT7302 consists of four wires: CS, SCLK, DIN, and DOUT. The interface can be operated in 3-wire mode with DIN tied to ground, in which case the inter- face has read-only capability, with data being read from the data register via the DOUT line. It is advisable to always use CS to create a communications window, as shown in Figure 13, because this improves synchronization between the ADT7302 and the master device. The DIN line is used to write the part into standby mode, if required. The CS line is used to select the device when more than one device is connected to the serial clock and data lines. The part operates in slave mode and requires an externally applied serial clock to the SCLK input to access data from the data register. The serial interface on the ADT7302 allows the part to be interfaced to systems that provide a serial clock synchronized to the serial data, such as the 80C51, 87C51, 68HC11, 68HC05, and PIC16Cxx microcontrollers as well as DSP processors. A read operation from the ADT7302 accesses data from the temperature value register while a write operation to the part writes data to the control register. Read Operation Figure 14 shows the timing diagram for a serial read from the ADT7302. The CS line enables the SCLK input. Thirteen bits of data plus a sign bit are transferred during a read operation. Read operations occur during streams of 16 clock pulses. The first two bits out are leading zeros and the next 14 bits contain the temperature data. If CS remains low and 16 more SCLK cycles are applied, the ADT7302 loops around and outputs the two leading zeros plus the 14 bits of data that are in the temper- ature value register. When CS returns high, the DOUT line goes into three-state. Data is clocked out onto the DOUT line on the falling edge of SCLK. |
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