Added Idac Thermal Shutdown Section - Analog Devices ADuCM320 Hardware Reference Manual

ADuCM320 Hardware Reference Manual
IDAC Thermal Shutdown
The ADuCM320 has an internal temperature sensor that monitors the die temperature. This temperature sensor can be monitored as an
ADC input channel; the measured voltage is proportional to die temperature. See the Temperature Sensor Settings section for more
information.
Internally, the die temperature is compared to a fixed voltage, proportional to approximately 130°C die temperature. If the die temperature
exceeds 130°C, there is a risk of damaging the die because the absolute maximum junction temperature rating is 150°C. Because the
IDACs potentially consume the most power, shut off the IDACs to reduce power and therefore to reduce the die temperature. Two
options to enable shutdown include the following:
•
Enable a thermal interrupt by setting either INTSEL[12] or INTSEL[4]. If the die temperature exceeds the threshold of approximately
130°C, this interrupt triggers and user code takes the appropriate action. It is recommended to use this procedure.
•
Enable automatic shutdown of the IDACs by setting the individual thermal shutdown bits for each IDAC via IDACxCON[6]. If this
bit is set in the appropriate IDACxCON register, the IDAC output current reduces to 0 mA, which reduces the power consumption of
the device and the die temperature of the device.
Note that the internal temperature sensor accuracy can be up to ±20°C, and there is no way of calibrating the thermal shutdown trip
point. Therefore, it is recommended that the automatic thermal shutdown feature (IDACxCON[6] = 0) not be enabled.
Rev. C | Page 39 of 196
UG-498