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Micrel, Inc.
MIC2590B
 
September 2008 
16
M9999-091808
 
 
Status Register, Slot A (STATA), 8-Bits Read Only
D[7]
read-only 
D[6]
read-only 
D[5]
read-only 
D[4]
read-
write 
D[3]
read-
write 
D[2]
read-
write 
D[1]
read-
write 
D[0]
read-
write 
FAULTA 
MAINA 
VAUXA 
VAUXAF 
12MVAF 
12VAF 
5VAF 
3VAF 
 
Bit(s)
Function
Operation
FALUTA
FAULT Pin Status, Slot
A
Notes 1 & 2
MAINA
MAIN Enable Status,
Slot A
Represents actual
state (on/off) of the
four main power
outputs for Slot A.
(+12V, +5V, +3.3V
and -12V)
1 = MAIN Power On
0 = MAIN Power Off
VAUXA
VAUX Enable Status,
Slot A
Represents actual
state (on/off) of the
auxiliary power
outputs for Slot A.
1 = MAIN Power On
0 = MAIN Power Off
VAUXFA
Overcurrent Fault
VAUX Supply
1 = Fault
0 = No Fault
12MVFA
Overcurrent Fault
-12V Supply
1 = Fault
0 = No Fault
12VFA
Overcurrent Fault
12V Supply
1 = Fault
0 = No Fault
5VFA
Overcurrent Fault
5V Supply
1 = Fault
0 = No Fault
3VFA
Overcurrent Fault
3V Supply
1 = Fault
0 = No Fault
 
Power-Up Default Value:
0000 0000
b
 = 00
h
 
Read Command Byte (R/W):   0000 0100
b
 = 04
h
 
The power-up default value is 00h. The slot is disabled
upon power-up, i.e., all supply outputs are off. In response
to an overcurrent fault condition, writing a logical 1 back
into the active (or set) bit position will clear the bit and de-
assert /INT. The status of the /FAULTA pin is not affected
by reading the Status Register.
 
Status Register, Slot B (STATB), 8-Bits Read Only
D[7]
read-only 
D[6]
read-only 
D[5]
read-only 
D[4]
read-
write 
D[3]
read-
write 
D[2]
read-
write 
D[1]
read-
write 
D[0]
read-
write 
FAULTB 
MAINB 
VAUXB 
VAUXBF 
12MVBF 
12VBF 
5VBF 
3VBF 
 
Bit(s)
Function
Operation
FALUTB
FAULT Pin Status, Slot
B
Notes 1 & 2
MAINB
MAIN Enable Status,
Slot B
Represents actual
state (on/off) of the
four main power
outputs for Slot B.
(+12V, +5V, +3.3V
and -12V)
1 = MAIN Power On
0 = MAIN Power Off
VAUXB
VAUX Enable Status,
Slot B
Represents actual
state (on/off) of the
auxiliary power
outputs for Slot B.
1 = MAIN Power On
0 = MAIN Power Off
VAUXFB
Overcurrent Fault
VAUX Supply
1 = Fault
0 = No Fault
12MVFB
Overcurrent Fault
-12V Supply
1 = Fault
0 = No Fault
12VFB
Overcurrent Fault
12V Supply
1 = Fault
0 = No Fault
5VFB
Overcurrent Fault
5V Supply
1 = Fault
0 = No Fault
3VFB
Overcurrent Fault
3V Supply
1 = Fault
0 = No Fault
 
Power-Up Default Value:
0000 0000
b
 = 00
h
 
Read Command Byte (R/W):   0000 0101
b
 = 05
h
 
The power-up default value is 00h. The slot is disabled
upon power-up, i.e., all supply outputs are off. In response
to an overcurrent fault condition, writing a logical 1 back
into the active (or set) bit position will clear the bit and de-
assert /INT. The status of the /FAULTB pin is not affected
by reading the Status Register.
 
 
Note 1. 
1 = /FAULT[A/B] pin asserted, indicating a fault condition (/FAULT is LOW).
 
0 = /FAULT[A/B] pin is de-asserted (/FAULT is HIGH).
If FAULT[A/B] has been set by an overcurrent condition on one (or more) of the main outputs, the corresponding ON[A/B] must go LOW
to reset FAULT. If FAULT[A/B] has been set by an overcurrent on a VAUX output, the corresponding AUXEN[A/B] must go LOW to reset
FAULT. If an overcurrent has occurred on both a main output and VAUX output of a slot, both ON[A/B] and AUXEN[A/B] of the
corresponding slot must go LOW to reset FAULT.
Note 2. 
The FAULT bits, and the /FAULT pins, are not active when the MIC2590B power paths are controlled by the System Management
Interface (SMBus). When using SMI power path control for a slot, the AUXEN and ON pins for that slot must be tied to ground.
 
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