T1024 datasheet(31/49 Pages) FREESCALE

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2.19 Temperature

The T1024 processor has a thermal diode attached to the die for direct temperature

measurement. The diode pins are connected to a two-channel ADT7461 thermal monitor,

which allows direct reading of the temperature of the die and it is accurate to ±1 °C. The

second channel of the ADT7461 measures the ambient (board) temperature.

The ADT7461 temperature warning and alarm signals are connected to the CPLD for

monitoring. The CPLD uses these signals to adjust CPU fan speed and protect the CPU

from over-temperature failure.

OVER ALARM

Thermal Sensor

(ADT7461)

DXP1

DXN

ALERT/THERM2

THERM

I2C BUS

T1024

THERM ALARM

CPLD

FAN_Power

PWM

TEMP_ANODE

TEMP_CATHODE

Figure 2-20. Temperature

2.20 DIP switch definition

The T1024RDB board has user selectable switches, for evaluating different boot

configurations and other special configurations for this device.

This configuration allows either the switch or the CPLD register to set the POR pin. The

CPLD register allows software to override the pin remotely when the board is in the

board farm.

To use the CPLD override option, software sets an override bit, which allows the CPLD

to override the switch setting during power on reset.

Chapter 2 Architecture

QorIQ T1024 Reference Design Board User Guide, Rev. 0, 04/2015

Freescale Semiconductor, Inc.

T1024 Datasheet(PDF) 31 Page - Freescale Semiconductor, Inc