ADT7310 datasheet(18/24 Pages) AD

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ADT7310

Rev. 0 | Page 18 of 24

SERIAL INTERFACE

ADT7310

GND

SCLK

DOUT

DIN

INT

VDD

10kΩ

PULL-UP

VDD

0.1µF

MICROCONTROLLER

VDD

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.

shows the command byte.

Table 15

Table 15. Command Byte

R/W

Continuous

read

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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