Local Smb Devices; Hardware Monitor Lm87 - EKF SC1-ALLEGRO User Manual

User Guide • SC1-ALLEGRO •

Local SMB Devices

The SC1-ALLEGRO contains devices that are attached to the System Management Bus (SMBus). These
are the SPD EEPROMs for the on-board memory or the possibly plugged SODIMM, a general purpose
serial EEPROM, a supply voltage/temperature controlling device and a set of board control and status
registers. Additional devices may be connected to the SMBus via the
2
signals I C_SCL (P1 B2) and I
J-EXP.
Address
0x58
0x5C
0xA0
0xA4
0xAE

Hardware Monitor LM87

Attached to the SMBus, the SC1-ALLEGRO is provided with a hardware monitor (LM87). This device
is capable to observe the board and on-board memory temperatures, as well as several supply voltage
rails with a resolution of 8 bit. The following table shows the mapping of the voltage inputs of the
LM87 to the corresponding supply voltages of the SC1-ALLEGRO:
Input
AIN1
AIN2
VCCP1
VCCP2/D2-
+2.5V/D2+
+3.3V
+5V
+12V
Beside the continuous measuring of temperatures and voltages the LM87 may compare these values
against programmable upper and lower boundaries. As soon as a measurement violates the allowed
value range, the LM87 can request an interrupt via the GPI13 input of the QM77 PCH (which may
result in a system management interrupt).
© EKF
CompactPCI
2
C_SDA (P1 B3), or pins 29/30 of the mezzanine expansion connector
Hardware Monitor/Memory Down Temperature Sensor (LM87)
Board Control/Status
SPD of On-board Memory
General Purpose EEPROM
Source
Processor Core Voltage
Graphics Core Voltage
+1.5V
+1.8V
+1.05V
+3.3V
+5V
+12V
® Serial
CPU Board • Intel® i7-3xxx Processor
CompactPCI
Description
SPD of SODIMM
Resolution
[mV]
9.8
9.8
14.1
14.1
13
17.2
26
62.5
-48-
®
Serial backplane
Register
0x28
0x29
0x21
0x25
0x20
0x22
0x23
0x24
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