The T1040 has a thermal diode attached to the die, allowing direct temperature
measurement. These pins are connected to an ADT7461 2-channel thermal monitor,
which allows direct reading of the temperature of the die and 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 or user software may use these signals to adjust CPU FAN speed
to protect the CPU from over-temperature failure.
I
2
C Bus
T1
040
TEMP_ANODE
Thermal sensor
(ADT7461)
DXP1
DXN
TEMP_CATHODE
THERM
ALERT/THERM2
OVER ALARM
THERM ALARM
CPLD
PWM
FAN_Power
Figure 2-20. Thermal Sensor connection
2.19 DIP switch definition
The T1040RDB card has user selectable switches, for evaluating different boot
configurations and other special configurations for this device. The CPLD allows
software to override the configuration pins; for example, when the board is in a board
farm. In order to use the CPLD override option, software sets an override bit that allows
the CPLD to override the switch setting during reset.
DIP switch definition
QorIQ T1040 Reference Design Board User Guide, Rev. 0, 06/2015
38 Freescale Semiconductor, Inc.
To Next Page
Loading...
