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ADT7420 Datasheet(PDF) 10 Page - Analog Devices |
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ADT7420 Datasheet(HTML) 10 Page - Analog Devices |
10 / 24 page ADT7420 Preliminary Technical Data Rev. PrA | Page 10 of CT and INT Operation in One-Shot Mode See Figure 12 for more information on one-shot CT pin operation for TCRIT overtemperature events when one of the limits is exceeded. Note that in interrupt mode, a read from any register resets the INT and CT pins. For the INT pin in the comparator mode, if the temperature drops below the THIGH – THYST value or goes above the TLOW + THYST value, a write to the one-shot bits (Bit 5 and Bit 6 of the configuration register, Register Address 0x03) resets the INT pin. For the CT pin in the comparator mode, if the temperature drops below the TCRIT – THYST value, a write to the operation mode bits (Bit 5 = 0 and Bit 6 = 1of the configuration register, Register Address 0x03) resets the CT pin (see Figure 12). Note that when using one-shot mode, ensure that the refresh rate is appropriate to the application being used. TEMPERATURE 149°C 148°C 147°C 146°C 145°C 144°C 143°C 142°C 141°C 140°C CT PIN POLARITY = ACTIVE LOW CT PIN POLARITY = ACTIVE HIGH TCRIT TCRIT – THYST TIME *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 CONVERSION TIME. THE DELAY IS 60ms IN THE CASE OF A ONE-SHOT CONVERSION. WRITE TO BIT 5 AND BIT 6 OF CONFIGURATION REGISTER.* WRITE TO BIT 5 AND BIT 6 OF CONFIGURATION REGISTER.* WRITE TO BIT 5 AND BIT 6 OF CONFIGURATION REGISTER.* Figure 12. One-Shot CT Pin |
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