C
OMPACT
CHAMP-AV IV U
SER
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S
M
ANUAL
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URTISS
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RIGHT
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ONTROLS
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MBEDDED
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OMPUTING
1-20
814256 V
ERSION
2 F
EBRUARY
2006
temperature sensors can measure temperatures in the range of -55 °C to 125 °C and have
an accuracy of approximately ±3 °C over the temperature range of 0 °C to 100 °C. The
temperatures are digitized with 11-bit resolution providing a resolution of 0.125 °C. The
conversion time for a single measurement is 125 ms typical and 155 ms max.
Each sensor can measure three voltages. Sensor U229 measures the following voltages: 5
V (voltage supplied to PMC1), 3.3 V, and 2.5 V. Sensor U225 measures the following
voltages: 5 V (voltage supplied to PMC2), 3.3 V, and 1.8 V. The voltage accuracy is 1.5%
over the range of 30% to 120% of its nominal value. The voltage is digitized with 8-bit
resolution. The conversion time for a single measurement is 62.5 ms typical.
Each sensor has an open-drain SMBus ALERT output that is connected to the cOBIC (see
Figure 1.4 on page 1-10). The cOBIC treats these signals as interrupt sources. The ALERT
interrupts are generated in response to one or more of the following conditions: High or Low
Temperature or High or Low Voltage. Once the ALERT interrupt is asserted, it remains
asserted (latched) until it is cleared through software. Each sensor has twelve
programmable ALERT thresholds consisting of a high and low threshold for each temperature
sensor and each voltage sensor.
Each sensor has an open-drain over-temperature OVERT output. The OVERT output from
both sensors are wire-ored together and connected to the on-board power control circuitry.
If either sensor's OVERT output is asserted, the on-board power control circuitry will turn off
the on-board power and the power will remain off until the backplane power is cycled. The
OVERT signal is only asserted in response to a High Temperature condition. Each sensor has
three programmable OVERT thresholds consisting of a high temperature threshold for each
sensor. The default threshold temperature is 127 °C. The OVERT feature is designed to
help prevent or minimize board damage in the event of a catastrophic over temperature
condition. During normal operation, the board temperatures will never approach 127° C.
COP I
NTERFACE
The Compact CHAMP-AV IV COP signals utilize 3.3 V signaling and are available on the J4
connector. When connecting an emulator to these signals, the emulator must be configured
for 3.3 V signaling. The COP interface is accessible via the:
Warning
Improper connection of the emulator can damage the Compact CHAMP-AV IV board and/or
the emulator. Observe orientation indicators on the emulator header. Only 3.3V signaling
is supported.
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