Datasheet ADT7320 (Analog Devices) - 13

Data Sheet ADT7320 REGISTERS
The ADT7320 contains eight registers:
STATUS REGISTER
This 8-bit read-only register (Register Address 0x00) reflects the • A status register status of the overtemperature and undertemperature interrupts • A configuration register that can cause the CT and INT pins to become active. It also • Five temperature registers reflects the status of a temperature conversion operation. The • An ID register interrupt flags in this register are reset by a read operation to the status register and/or when the temperature value returns The status register, temperature value register, and the ID within the temperature limits including hysteresis. The RDY bit is register are read only. reset after a read from the temperature value register. In one- shot and 1 SPS modes, the RDY bit is reset after a write to the
Table 6. ADT7320 Registers
operation mode bits in the configuration register.
Register Address Description Power-On Default
0x00 Status 0x80 0x01 Configuration 0x00 0x02 Temperature value 0x0000 0x03 ID 0xC3 0x04 TCRIT setpoint 0x4980 (147°C) 0x05 THYST setpoint 0x05 (5°C) 0x06 THIGH setpoint 0x2000 (64°C) 0x07 TLOW setpoint 0x0500 (10°C)
Table 7. Status Register (Register Address 0x00) Default Bit(s) Value Type Name Description
[3:0] 0000 R Unused Reads back 0. [4] 0 R TLOW This bit is set to 1 when the temperature goes below the TLOW temperature limit. The bit is cleared to 0 when the status register is read and/or when the temperature measured rises above the limit set in the TLOW + THYST setpoint registers. [5] 0 R THIGH This bit is set to 1 when the temperature rises above the THIGH temperature limit. This bit is cleared to 0 when the status register is read and/or when the temperature measured drops below the limit set in the THIGH − THYST setpoint registers. [6] 0 R TCRIT This bit is set to 1 when the temperature rises above the TCRIT temperature limit. This bit is cleared to 0 when the status register is read and/or when the temperature measured drops below the limit set in the TCRIT − THYST setpoint registers.

[7] 1 R RDY This bit goes low when the temperature conversion result is written to the temperature value register. It is reset to 1 when the temperature value register is read. In one-shot and 1 SPS modes, this bit is reset after a write to the operation mode bits in the configuration register. Rev. 0 | Page 13 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS SPI TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS CONTINUOUS CONVERSION MODE ONE-SHOT MODE CT and INT Operation in One-Shot Mode 1 SPS MODE SHUTDOWN MODE FAULT QUEUE TEMPERATURE DATA FORMAT TEMPERATURE CONVERSION FORMULAS 16-Bit Temperature Data Format 13-Bit Temperature Data Format 10-Bit Temperature Data Format 9-Bit Temperature Data Format REGISTERS STATUS REGISTER CONFIGURATION REGISTER TEMPERATURE VALUE REGISTER ID REGISTER TCRIT SETPOINT REGISTER THYST SETPOINT REGISTER THIGH SETPOINT REGISTER TLOW SETPOINT REGISTER SERIAL INTERFACE SPI COMMAND BYTE WRITING DATA READING DATA INTERFACING TO DSPs OR MICROCONTROLLERS SERIAL INTERFACE RESET INT AND CT OUTPUTS UNDERTEMPERATURE AND OVERTEMPERATURE DETECTION Comparator Mode Interrupt Mode APPLICATIONS INFORMATION THERMAL RESPONSE TIME SUPPLY DECOUPLING POWERING FROM A SWITCHING REGULATOR TEMPERATURE MEASUREMENT QUICK GUIDE TO MEASURING TEMPERATURE OUTLINE DIMENSIONS ORDERING GUIDE