ADLINK Express-BE - Manual (Page 40)

Page 40 Express-BE
5.1. Board Specific SEMA Functions
5.1.1. Voltages
The BMC of the Express-BE 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 into high-byte (MSB) and low-byte (LSB).
ADC Channel Voltage Name Voltage Formula [V]
0 Not used
1 +V3.3V (MSB<<8 + LSB) x 1.1 x 3.3 / 1024
2 +V1.05S (MSB<<8 + LSB) x 3.3 / 1024
3 +V3.3V (MSB<<8 + LSB) x 1.1 x 3.3 / 1024
4 +VMEM (MSB<<8 + LSB) x 3.3 / 1024
5 +V5.0V (MSB<<8 + LSB) x 1.833 x 3.3 / 1024
6 +VIN (MSB<<8 + LSB) x 6.000 x 3.3 / 1024
7 (MAIN CURRENT) Use Main Current Function
5.1.2. Main Current
The BMC of the Express-BE 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 high-byte (MSB) and low-byte (LSB). These 4 values represent the last 4 currents drawn by the
board. The values are sampled every 250ms. The order of the 4 values is NOT in chronological order. Access by the BMC may increase the
drawn current of the whole system. In this case, there are still 3 samples not influenced by the read access.
Main Current = (MSB_n<<8 + LSB_n) x 8.06mA
5.1.3. BMC Status
This register shows the status of BMC controlled signals on the Express-BE.
Status Bit Signal
0 WDT_OUT
1 LVDS_VDDEN
2 LVDS_BKLTEN
3 BIOS_MODE
4 POSTWDT_DISn
5 SEL_BIOS
6 BIOS_DIS0n
7 BIOS_DIS1n