38
Smart Embedded Management Agent (SEMA)
5.1. Board Specific SEMA Functions
5.1.1. Voltages
The BMC of the Express-SL2 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
VCORE
(MSB<<8 + LSB) x 3.3 / 1024
1
VGFX
(MSB<<8 + LSB) x 3.3 / 1024
2
VMEM
(MSB<<8 + LSB) x 3.3 / 1024
3
5VSB
(MSB<<8 + LSB) x 1.826 x 3.3 / 1024
4
RTC
(MSB<<8 + LSB) x 3.3 / 1024
5
VIN
(MSB<<8 + LSB) x 6.000 x 3.3 / 1024
6
5V
(MSB<<8 + LSB) x 1.826 x 3.3 / 1024
7
3.3V
(MSB<<8 + LSB) x 1.100 x 3.3 / 1024
8
3.3VSB
(MSB<<8 + LSB) x 1.100 x 3.3 / 1024
9
(MAIN CURRENT)
Use Main Current Function
Table 7: SEMA Onboard Voltage Monitor
5.1.2. Main
Current
The BMC of the Express-SL2 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-SL2.
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
Table 8: SEMA BMC Status
Содержание Express-SL2
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