ADT7420UCPZ-RL7 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADT7420UCPZ-RL7

±0.25°C Accurate, 16-Bit Digital I2C Temperature Sensor

Analog Devices 

ADT7420

Preliminary Technical Data

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

TCRIT

TCRIT – THYST

CT PIN

POLARITY = ACTIVE HIGH

TIME

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.*

*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.

Figure 12. One-Shot CT Pin

Rev. PrA | Page 10 of 

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