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

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

configuration register, Register Address 0x03) resets the INT pin.

For the CT pin in the comparator mode, if the temperature

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

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

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