Fujitsu MAT3300FC User Manual

 

C141-C008 

1-17 

(1)  +12V charge, +5V charge 

These signals are used to precharge of the internal circuits to avoid excessive 
surge current while hot plugging is being operated. 

Before power voltage pins (+12V and +5V) make contact, these precharge pins 
mate early. 

Precharge control circuits are external to the drive. 

The voltage provided to the precharge signals are defined in Table 1.9. 

Charge Signal 

Range of power supply 
after charge complete 

Max Surge to the 
drive 

Max Continuous 
required the drive 

+12V charge 

12V +5%, –12% 

6 Amps 

1 Amps 

+5V charge 

5V +5%, –17% 

6 Amps 

1 Amps 

 

(2)  Fault LED out 

The drive starts, and this signal lights when it detects internal failure. 

1)  Fault LED is turned on when asserting Enable Bypass signals for both ports. 

2)  Fault LED is turned on when the internal failure is detected. 

a)  When losing synchronization on both ports 

b)  When detecting hardware error in the HDC chip 

3)  Fault LED is turned on when the host issues the corresponding command. 

Note:  The Fault LED will not be turned on if only one port loses synchronization. 

The Fault LED out signal is an open-collector output.  The LED and the current 
limiting register are external to the drive.  See Table 1.10. 

State Current Output 

Voltage 

LED off 

–100

µA <IOH < 100µA 

 

LED on 

IOL > 30mA 

0 < VOL <0.5V