ADLINK Technology Q7-BT, Technical Reference

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40 Utilities
4.2.1 Board Specific SEMA functions
Voltages
The BMC of the Q7-BT implements a Voltage Monitor and samples several Onboard Voltages.
The Voltages can be read by calling the SEMA function, “Get Voltages”. The function returns a
16-bit value divided in Hi-Byte (MSB) and Lo-Byte (LSB).
Main Current
The BMC of the Q7-BT implements a Current Monitor. The current can be read by calling the
SEMA function “Get Main Current”. The function returns four 16-bit values divided in Hi-Byte
(MSB) and Lo-Byte (LSB). These four values represent the last four currents drawn by the
board. The values are sampled every 250ms. The order of the four values is NOT in relationship
to time. The access to the BMC may increase the drawn current of the whole system. In this
case, you still have three samples without the influence of the read access.
Main Current = (MSB_n<<8 + LSB_n) * 8.06mA
TS#-Events
TS# is activated by a temperature sensor when a device reaches its critical temperature and
released when the device is back in its normal temperature range. This counter gives the user
information about temperature or cooling issues. This counter is cleared when the system is
removed from power. The Q7-BT only monitors the board temperature and does not support
TS#-Events.
Table 4-1: BMC Voltage Monitor Values
ADC
Channel
Voltage
Name
Voltage
Formula [V]
0 --- ---
1 +V1.0S (MSB<<8 + LSB) * 3.3 / 1024
2 +V1.2S (MSB<<8 + LSB) * 3.3 / 1024
3 +V1.8S (MSB<<8 + LSB) * 3.3 / 1024
4 +V3.3S (MSB<<8 + LSB) * 1.100 * 3.3 / 1024
5 +V1.5S (MSB<<8 + LSB) * 3.3 / 1024
6 +V5.0A (MSB<<8 + LSB) * 1.833 * 3.3 / 1024
7 (MAINCURRENT) Use Main Current Function