EVAL-ADT7X20EBZ View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

EVAL-ADT7X20EBZ

±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor

Analog Devices 

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Data Sheet

SERIAL INTERFACE

MICROCONTROLLER

PULL-UP

VDD

TO VDD

VDD

ADT7320

SCLK

DOUT

DIN

CS

GND

CT

INT

0.1µF

10kΩ 10kΩ

Figure 14. Typical SPI Interface Connection

ADT7320

The ADT7320 has a 4-wire serial peripheral interface (SPI). The

interface has a data input pin (DIN) for writing data to the device, a

data output pin (DOUT) for reading data back from the device,

and a serial 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 ADT7320 on the falling edge of SCLK,

and data is clocked into the device on the rising 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. The

command byte indicates to the ADT7320 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

0

R/W

Register address

C2 C1 C0

0

0

0

Bit C7, Bit C2, Bit C1, and Bit C0 of the command byte must all be

set to 0 to successfully begin a bus transaction. The SPI interface

does not work correctly if a 1 is written into any of these bits.

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.

Rev. 0 | Page 17 of 24

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