MIC2590B Micrel Semiconductor, MIC2590B Datasheet - Page 15

• Manufacturer Part Number: MIC2590B
• Description: Dual-Slot PCI Hot Plug Controller
• Manufacturer: Micrel Semiconductor

Detailed Register Descriptions below:
Power-Up Default Value: Undefined following POR
Read Command Byte:
Power-Up Default Value: 0000 0000
Command Byte (R/W):
To operate the ADC the ADCNTRL register must first be
initialized by selecting a slot, specifying whether voltage or
current is to be measured and then specifying the specific
supply that is to be monitored. The software must then
wait 100ms, or poll the BUSY bit until it is zero. The
RESULT register will then contain the valid result of the
conversion.
August 2002
MIC2590B
read-only read-only read-only read-only read-only read-only read-only read-only
read-only read-only read-only read-write read-write read-write read-write read-write
BUSY
SUP[2:0]
D[7]
D[7]
BUSY
Bit(s)
Conversion Result Register (RESULT), 8-Bits Read Only
(ADC Control Register (ADCNTRL), 8-Bits Read/Write
PAR
SEL
D[6]
D[5]
D[7:0]
Bit
Reserved Reserved
D[6]
D[6]
Reserved
Reserved
Parameter Control Bit for 1 = Voltage
ADC Conversion
ADC Conversion
ADC Status
A/D Slot Select
Supply Select for
Voltage or Current Data from ADC
D[5]
D[5]
Measured data from ADC
Function
D[4]
D[4]
SEL
Function
0000 0000
0000 0001
PAR
D[3]
D[3]
0 = ADC Quiescent
1 = ADC Busy
Always Read As Zero
Always Read As Zero
Specifies Channel for
A/D Conversion
0 = Slot A, 1 = Slot B
0 = Current
000 = No Conversion
001 = 3.3V Suppy
010 = 5.0V Supply
011 = +12V Supply
100 = –12V Supply
101 = VAUX Supply
D[2]
D[2]
b
b
b
= 00
= 00
= 01
Supply Select
Operation
SUP[2:0]
h
h
h
D[1]
D[1]
Operation
Read Only
D[0]
D[0]
15
Power-Up Default Value: 0000 0000
Command Byte (R/W):
The power-up default value is 00h. Slot A is disabled upon
power-up, i.e., all supply outputs are off.
Power-Up Default Value: 0000 0000
Command Byte (R/W):
The power-up default value is 00h. Slot B is disabled upon
power-up, i.e., all supply outputs are off.
MAINAPG MAIN Output Power-Good 1 = Power-Good
MAINBPG MAIN Output Power-Good 1 = Power-Good
read-only read-only read-only read-only read-only read-only read-write read-write
AUXAPG MAINAPG Reserved Reserved Reserved Reserved
read-only read-only read-only read-only read-only read-only read-write read-write
AUXBPG MAINBPG Reserved Reserved Reserved Reserved
AUXAPG
AUXBPG
D[7]
VAUXA
D[7]
VAUXB
MAINA
MAINB
Bit(s)
Bit(s)
Control Register, Slot B (CNTRLB), 8-Bits Read/Write
D[5]
D[4]
D[3]
D[2]
D[5]
D[4]
D[3]
D[2]
Control Register, Slot A (CNTRLA), 8-Bits Read/Write
D[6]
D[6]
AUX Output Power-Good
Status, Slot A
Status, Slot A
Reserved
Reserved
Reserved
Reserved
MAIN Enable Control,
Slot A
VAUX Enable Control,
Slot A
AUX Output Power-Good
Status, Slot B
Status, Slot B
Reserved
Reserved
Reserved
Reserved
MAIN Enable Control,
Slot B
VAUX Enable Control,
Slot B
D[5]
D[5]
Function
Function
D[4]
D[4]
0000 0010
0000 0011
D[3]
D[3]
1 = Power-Good
(VAUXA output is above
(MAINA outputs are
above their V
thresholds)
Always Read As Zero
Always Read As Zero
Always Read As Zero
Always Read As Zero
0 = OFF, 1 = ON
0 = OFF, 1 = ON
1 = Power-Good
(VAUXB output is above
its V
(MAINB outputs are
above their V
thresholds)
Always Read As Zero
Always Read As Zero
Always Read As Zero
Always Read As Zero
0 = OFF, 1 = ON
0 = OFF, 1 = ON
its V
D[2]
D[2]
b
b
b
b
= 00
= 02
= 00
= 03
UVTH
Operation
UVTH
Operation
h
h
h
h
MAINA
MAINB
threshold)
D[1]
D[1]
threshold)
MIC2590B
UVTH
UVTH
VAUXA
VAUXB
Micrel
D[0]
D[0]