| SMA200 Manual V1.0 |
5.4.7.SMBus
|
|
|
| On Module | Ext. Ter- | Max. |
| Matched |
Signal | BUS | Type | Description | Termination | mination | Length | Ohm | Length |
|
|
|
|
| Needed | in mm |
| in mm |
SMB_ALERT# | CMOS | 3.3V | Connect to the SMB device | PU 10k to | - | 200 | 55 | - |
|
| In |
| 3.3V |
|
|
|
|
SMB_DATA | CMOS | 3.3V | Connect to the SMB device | PU 4.7k to | - | 200 | 55 | - |
|
| I/O | open drain | 3.3V |
|
|
|
|
SMB_CLOCK | CMOS | 3.3V | Connect to the SMB device | PU 4.7k to | - | 200 | 55 | - |
|
| I/O | open drain | 3.3V |
|
|
|
|
If the signals are not used:
The pins can stay open.
Remarks:
The SMB_ALERT# may be used to initiate an SMB event over APIC or an SMI.
Maximum BUS capacitance is 200pF. For higher BUS loads, the SMB repeater PCA9515 from Philips is recommended. Each new SMB segment must be terminated with 2x 4.7k.
EMV/EMI filters:
Are not needed.
31
