Datasheet ADT7410 (Analog Devices) - 10

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ADT7410 Data Sheet ONE-SHOT MODE CT and INT Operation in One-Shot Mode
When one-shot mode is enabled, the ADT7410 immediately See Figure 13 for more information on one-shot CT pin completes a conversion and then goes into shutdown mode. The operation for TCRIT overtemperature events when one of the one-shot mode is useful when one of the circuit design priorities is limits is exceeded. Note that in interrupt mode, a read from to reduce power consumption. any register resets the INT and CT pins. To enable one-shot mode, set Bits[6:5] of the configuration For the INT pin in the comparator mode, if the temperature register (Register Address 0x03) to 01. drops below the THIGH − THYST value or goes above the TLOW + After writing to the operation mode bits, wait at least 240 ms THYST value, a write to the one-shot bits (Bit 5 and Bit 6 of the before reading back the temperature from the temperature value configuration register, Register Address 0x03) resets the INT pin. register. This delay ensures that the ADT7410 has adequate time For the CT pin in the comparator mode, if the temperature to power up and complete a conversion. drops below the TCRIT − THYST value, a write to the one-shot To obtain an updated temperature conversion, reset Bits[6:5] of the bits (Bit 5 and Bit 6 of the configuration register, Register configuration register (Register Address 0x03) to 01. Address 0x03) resets the CT pin. See Figure 13.
1 SPS MODE
Note that when using one-shot mode, ensure that the refresh rate is appropriate to the application being used. In this mode, the part performs one measurement per second. A conversion takes only 60 ms, and it remains in the idle state for the remaining 940 ms period. This mode is enabled by writing 1 to Bit 6 and 0 to Bit 5 of the configuration register (Register Address 0x03).
TEMPERATURE 149°C 148°C 147°C TCRIT 146°C 145°C 144°C 143°C 142°C TCRIT – THYST 141°C 140°C CT PIN POLARITY = ACTIVE LOW CT PIN POLARITY = ACTIVE HIGH TIME WRITE TO WRITE TO WRITE TO BIT 5 AND BIT 6 OF BIT 5 AND BIT 6 OF BIT 5 AND BIT 6 OF CONFIGURATION CONFIGURATION CONFIGURATION REGISTER.* REGISTER.* REGISTER.* *THERE IS A 240ms DELAY BETWEEN WRITING TO THE CONFIGURATION REGISTER TO START A STANDARD ONE-SHOT CONVERSION AND THE CT PIN GOING ACTIVE. THIS IS DUE TO THE
013
CONVERSION TIME. THE DELAY IS 60ms IN THE CASE OF A 1 SPS CONVERSION.
06560- Figure 13. One-Shot CT Pin Rev. C | Page 10 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS I2C TIMING SPECIFICATIONS Timing Diagram ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS TEMPERATURE MEASUREMENT ONE-SHOT MODE 1 SPS MODE CT and INT Operation in One-Shot Mode SHUTDOWN 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 ADDRESS POINTER REGISTER TEMPERATURE VALUE REGISTERS STATUS REGISTER CONFIGURATION REGISTER THIGH SETPOINT REGISTERS TLOW SETPOINT REGISTERS TCRIT SETPOINT REGISTERS THYST SETPOINT REGISTER ID REGISTER SERIAL INTERFACE SERIAL BUS ADDRESS WRITING DATA READING DATA RESET GENERAL CALL INT AND CT OUTPUTS UNDERTEMPERATURE AND OVERTEMPERATURE DETECTION Comparator Mode Interrupt Mode APPLICATIONS INFORMATION THERMAL RESPONSE TIME SUPPLY DECOUPLING TEMPERATURE MONITORING OUTLINE DIMENSIONS ORDERING GUIDE