Datasheet

1.3 Physical Requirements, Electrical Requirements
C141-C008 1-17
1.3.2 Signal function in SFF8045 mode
(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.
Table 1.9 Charge supply to the drive
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.
Table 1.10 Characteristics of Fault LED out signal
State Current Output Voltage
LED off
–100µA <IOH < 100µA
LED on IOL > 30mA 0 < VOL <0.5V