LTC4245 LINER [Linear Technology], LTC4245 Datasheet - Page 30

• Manufacturer Part Number: LTC4245
• Description: Multiple Supply Hot Swap Controller with I2C Compatible Monitoring
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
LTC4245
Table 6. LTC4245 Register Address and Contents
All registers are 8-bit wide.
*
** Cannot set D3:D0 high if bit A1 set.
†
Table 7. STATUS Register A (00h)- Read Only
30
REGISTER ADDRESS*
DECIMAL
0, 8
1, 9
2, 10
3, 11
4, 12
5, 13
6, 14
7, 15
16
17
18
19
20
21
22
23
24
25
26
27
28 to 31
BIT
A7
A6
A5
A4
A3
A2
A1
A0
Register address MSBs b7 – b5 are ignored.
Set bit C7 before writing.
NAME
ADC Busy
BD_SEL# Input
FET Short Present
LOCAL_PCI_RST# Output
PCI_RST# Input
Power Bad
SS Busy
Undervoltage
HEX
00h, 08h
01h, 09h
02h, 0Ah
03h, 0Bh
04h, 0Ch
05h, 0Dh
06h, 0Eh
07h, 0Fh
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
1Ch to 1Fh
U
REGISTER NAME
STATUS (A)
ALERT (B)
CONTROL (C)
ON (D)
FAULT1 (E)
FAULT2 (F)
GPIO (G)
ADCADR (H)
12VIN (I)
12VSENSE (J)
12VOUT (K)
5VIN (L)
5VSENSE (M)
5VOUT (N)
3VIN (O)
3VSENSE (P)
3VOUT (Q)
VEEIN (R)
VEESENSE (S)
VEEOUT (T)
GPIOADC (U)
U
OPERATION
Indicates State of ADC; 1 = ADC Busy Measuring, 0 = ADC Quiescent
State of the BD_SEL# Pin; 1 =BD_SEL# High, 0 = BD_SEL# Low
Indicates Potential FET Short on at Least One Supply, if ADC Current Sense Voltage Measurement Exceeds 7
LSB While FET is Off; 1 = FET is Shorted, 0 = FET is Not Shorted
LOCAL_PCI_RST# Pin Open-Drain Output State; 1 = High Impedance, 0 = Pulls Low
State of the PCI_RST# Pin; 1 = PCI_RST# High, 0 = PCI_RST# Low
Indicates Power Bad Present on at Least One of the Supply Outputs; 1 = Power Bad, 0 = No Power Bad
Indicates SS Pin is Being Used to Ramp Up a Supply, Affects Writing to D3:D0 Bits
1 = SS Pin Ramping, Cannot Set D3:D0 High, 0 = SS Pin Reset
Indicates Undervoltage Present on at Least One of the Input Supply; 1 = Undervoltage, 0 = Not Undervoltage
W
D3:D0 R/W**, D7:D4 R
G2:G0 R, G7:G3 R/W
U
READ/WRITE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
†
†
†
†
†
†
†
†
†
†
†
†
†
DESCRIPTION
System Status Information
Controls Which Faults Cause ALERT# Pin to be Pulled Low
Controls Part Behavior Such As Auto-Retry, Sequencing, etc.
Sets State and Reports Status of Switches
Fault Log for Undervoltage and Overcurrent
Fault Log for Power Bad, PGI, FET Short, BD_SEL#, GPIO1
Sets State and Reports Status of GPIO1 to GPIO3 pins, Control
Which Pin is Multiplexed to the GPIO Channel of ADC
4-Bit ADC Channel Address for On-Demand ADC Measurement
ADC 12V
ADC 12V Current Sense Voltage Data
ADC 12V
ADC 5V
ADC 5V Current Sense Voltage Data
ADC 5V
ADC 3V
ADC 3.3V Current Sense Voltage Data
ADC 3V
ADC V
ADC –12V Current Sense Voltage Data
ADC V
ADC GPIO Voltage Data
EEIN
EEOUT
IN
OUT
IN
OUT
IN
OUT
Voltage Data
Voltage Data
Voltage Data
Voltage Data
Voltage Data
Voltage Data
Voltage Data
Voltage Data
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