ADT7420 Analog Devices, ADT7420 Datasheet - Page 10

• Manufacturer Part Number: ADT7420
• Description: 16-Bit Digital I2C Temperature Sensor
• Manufacturer: Analog Devices

ADT7420
CT and INT Operation in One-Shot Mode
See Figure 12 for more information on one-shot CT pin
operation for T
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 T
T
configuration register, Register Address 0x03) resets the INT pin.
HYST
value, a write to the one-shot bits (Bit 5 and Bit 6 of the
CRIT
HIGH
overtemperature events when one of the
– T
HYST
POLARITY = ACTIVE HIGH
POLARITY = ACTIVE LOW
*THERE IS A 240ms DELAY BETWEEN WRITING TO THE CONFIGURATION REGISTER TO START
value or goes above the T
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
CT PIN
CT PIN
149°C
148°C
147°C
146°C
145°C
144°C
143°C
142°C
141°C
140°C
TEMPERATURE
LOW
Figure 12. One-Shot CT Pin
BIT 5 AND BIT 6 OF
CONFIGURATION
+
Rev. PrA | Page 10 of
REGISTER.*
WRITE TO
BIT 5 AND BIT 6 OF
CONFIGURATION
For the CT pin in the comparator mode, if the temperature
drops below the T
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.
REGISTER.*
WRITE TO
ONE-SHOT CONVERSION.
BIT 5 AND BIT 6 OF
CONFIGURATION
REGISTER.*
WRITE TO
CRIT
Preliminary Technical Data
– T
T
T
CRIT
CRIT – T HYST
TIME
HYST
value, a write to the operation
www.DataSheet4U.com