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ADT7310 Datasheet(PDF) 19 Page - Analog Devices |
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ADT7310 Datasheet(HTML) 19 Page - Analog Devices |
19 / 25 page ADT7310 Data Sheet Rev. A | Page 18 of 24 SERIAL INTERFACE ADT7310 GND SCLK DOUT DIN CT INT VDD 10kΩ 10kΩ PULL-UP VDD 0.1µF MICROCONTROLLER VDD CS Figure 17. Typical SPI Interface Connection The ADT7310 has a 4-wire serial peripheral interface (SPI). The interface has a data input pin (DIN) for inputting data to the device, a data output pin (DOUT) for reading data back from the device, and a data clock pin (SCLK) for clocking data into and out of the device. A chip select pin (CS) enables or disables the serial interface. CS is required for correct operation of the interface. Data is clocked out of the ADT7310 on the negative edge of SCLK, and data is clocked into the device on the positive edge of SCLK. SPI COMMAND BYTE All data transactions on the bus begin with the master taking CS from high to low and sending out the command byte. This indicates to the ADT7310 whether the transaction is a read or a write and provides the address of the register for the data transfer. Table 15 shows the command byte. Table 15. Command Byte C7 C6 C5 C4 C3 C2 C1 C0 0 R/W Register address Continuous read 0 0 Bit C7 of the command byte must be set to 0 to successfully begin a bus transaction. The SPI interface does not work correctly if a 1 is written into this bit. Bit C6 is the read/write bit; 1 indicates a read, and 0 indicates a write. Bits[C5:C3] contain the target register address. One register can be read from or written to per bus transaction. Bit C2 activates a continuous read mode on the temperature value register only. When this bit is set, the serial interface is configured so that the temperature value register can be continuously read. When the command word is 01010100 (0x54), the contents of the temperature value register can be read out without requiring repeated writes to set the address bits. Simply sending 16 SCLK clocks to the ADT7310 clocks the contents of the temperature value register onto the DOUT pin. |
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