SMBAlert protocol is also supported by the module. By which the module can alert the PMBus master
that it has an active status or alarm condition.
(Standard manual of SMBus for the details : System Management Bus(SMBus) Specification Ver 2.0)
( URL: http://smbus.org/specs/ )
5.1 Connecting SMBAlert terminal
Output terminal of SMBAlert is open drain. When you use function of SMBAlert,
connect pull-up resistor with SMBAlert terminal.
When something abnormal is happened in slave device, Slave device which detects something
abnormal will make SMBAlert low level.
5.2 Identifying slave device issuing SMBAlert signal
Master-device can identify which slave device has something abnormal.
By receiving READ communication (*1) using ARA from master device, power supply
with something abnormal sends original address.
*1:
When receiving READ communication using ARA, SMBAlert will be cancelled .
In order to enable the SMBAlert signal, it is necessary to send CLEAR_FAULTS [ 03h ].
Figure 5-1 Example of operation on SMBAlert
Diagram 5-2 Identifying Slave using ARA
2.1 Pin configuration
5. Explanation for terminal function of SMBAlert
Master device
Send ARA( 0Ch )
Slave device
（ CHS ）
Slave device
（ CHS ）
Fault detection
Address change
0Dh →
0000Ch (ARA)
Ch (ARA)
Ch (ARA)
Ch (ARA)
Address
0Eh
Master device
Send address( 0Dh )
Slave device
（ CHS ）
Slave device
（ CHS ）
Fault detection
Address change
0000Ch (ARA)
Ch (ARA)
Ch (ARA)
Ch (ARA)
Address
0Eh
Applications manual
For CHS300/400/500-
I
series
- 10 -
