LTC4245
31
4245fa
Table 8. ALERT Register B (01h) – Read/Write
BIT NAME OPERATION
B7 GPIO1 State Change Alert Enables Alert When GPIO1 Changes State; 1 = Enable Alert, 0 = Disable Alert (Default)
B6 BD_SEL# State Change Alert Enables Alert When BD_SEL# Changes State; 1 = Enable Alert, 0 = Disable Alert (Default)
B5 FET Short Alert Enables Alert for FET Short Condition; 1 = Enable Alert, 0 = Disable Alert (Default)
B4 PGI Fault Alert Enables Alert When a PGI Fault Occurs; 1 = Enable Alert, 0 = Disable Alert (Default)
B3 Alert Present ALERT# Pin Open-Drain Output State; 1 = Pulls Low, 0 = High Impedance (Default)
B2 Power Bad Alert Enables Alert When Output Power is Bad; 1 = Enable Alert, 0 = Disable Alert (Default)
B1 Overcurrent Alert Enables Alert for Overcurrent Condition; 1 = Enable Alert, 0 = Disable Alert (Default)
B0 Undervoltage Alert Enables Alert for Undervoltage Condition; 1 = Enable Alert, 0 = Disable Alert (Default)
Table 9. CONTROL Register C (02h) – Read/Write
BIT NAME OPERATION
C7 ADC Free-Run Disable Disable ADC Free Running Operation to Allow On-Demand Measurement and Writes to ADC
Registers; 1 = Halt ADC Free Running, 0 = ADC Free Running (Default)
C6 Sequencing Enable Enables Supplies to Turn-On in a Set Sequence
1 = Sequencing Enabled, 0 = Sequencing Disabled (Default)
C5 Mass Write Enable Enables Mass Write Using Address (0010 111)b
1 = Mass Write Enabled (Default), 0 = Mass Write Disabled
C4 PGI Fault Autoretry Enables Autoretry After a PGI Fault; 1 = Retry Enabled, 0 = Retry Disabled (Default)
C3 PGI Pin Disable Enables PGI Pin Going Low During Normal Operation to Shut Off Switches
1 = PGI Pin Disabled (Default), 0 = PGI Pin Enabled
C2 Reserved Not Used
C1 Overcurrent Autoretry Enables Autoretry After an Overcurrent Fault; 1 = Retry Enabled, 0 = Retry Disabled (Default)
C0 Undervoltage Autoretry Enables Autoretry After an Undervoltage Fault; 1 = Retry Enabled (Default), 0 = Retry Disabled
Table 10. ON Register D (03h) – Read/Write
BIT NAME OPERATION
D7 –12V FET On Status Indicates State of –12V FET. Read Only Bit; 1 = FET On, 0 = FET Off
D6 3.3V FET On Status Indicates State of 3.3V FET. Read Only Bit; 1 = FET On, 0 = FET Off
D5 5V FET On Status Indicates State of 5V FET. Read Only Bit; 1 = FET On, 0 = FET Off
D4 12V FET On Status Indicates State of 12V FET. Read Only Bit; 1 = FET On, 0 = FET Off
D3 –12V FET On Control Turns –12V FET On and Off. Not used if CFG Pin is Not Low. Cannot Write 1 if Bit A1 Set
1 = Turn FET On, 0 = Turn FET Off. Defaults to ON Pin State at End of Debounce Delay
D2 3.3V FET On Control Turns 3.3V FET On and Off. Cannot Write 1 if Bit A1 Set
1 = Turn FET On, 0 = Turn FET Off. Defaults to ON Pin State at End of Debounce Delay
D1 5V FET On Control Turns 5V FET On and Off. Cannot Write 1 if Bit A1 Set
1 = Turn FET On, 0 = Turn FET Off. Defaults to ON Pin State at End of Debounce Delay
D0 12V FET On Control Turns 12V FET On and Off. Also Turns –12V FET On and Off if CFG Pin is Not Low. Cannot Write 1
if Bit A1 Set
1 = Turn FET On, 0 = Turn FET Off. Defaults to ON Pin State at End of Debounce Delay
APPLICATIO S I FOR ATIO
WUU
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LTC4245
32
4245fa
Table 11. FAULT1 Register E (04h) – Read/Write
BIT NAME OPERATION
E7 –12V Overcurrent Fault Occurred Indicates Overcurrent Fault Occurred on –12V Supply
1 = Overcurrent Fault Occurred, 0 = No Overcurrent Faults
E6 3.3V Overcurrent Fault Occurred Indicates Overcurrent Fault Occurred on 3.3V Supply
1 = Overcurrent Fault Occurred, 0 = No Overcurrent Faults
E5 5V Overcurrent Fault Occurred Indicates Overcurrent Fault Occurred on 5V Supply
1 = Overcurrent Fault Occurred, 0 = No Overcurrent Faults
E4 12V Overcurrent Fault Occurred Indicates Overcurrent Fault Occurred on 12V Supply
1 = Overcurrent Fault Occurred, 0 = No Overcurrent Faults
E3 –12V Undervoltage Fault Occurred Indicates –12V Supply Undervoltage Fault Occurred When V
EEIN
Went High
1 = V
EEIN
was High, 0 = No Undervoltage Faults
E2 3.3V Undervoltage Fault Occurred Indicates 3.3V Supply Undervoltage Fault Occurred When 3V
IN
Went Low
1 = 3V
IN
was Low, 0 = No Undervoltage Faults
E1 5V Undervoltage Fault Occurred Indicates 5V Supply Undervoltage Fault Occurred When 5V
IN
Went Low
1 = 5V
IN
was Low, 0 = No Undervoltage Faults
E0 12V Undervoltage Fault Occurred Indicates 12V Supply Undervoltage Fault Occurred When 12V
IN
Went Low
1 = 12V
IN
was Low, 0 = No Undervoltage Faults
Table 12. FAULT2 Register F (05h) – Read/Write
BIT NAME OPERATION
F7 GPIO1 Changed State Indicates that GPIO1 Pin Changed State; 1 = GPIO1 Changed State, 0 = GPIO1 Unchanged
F6 BD_SEL# Changed State Indicates that BD_SEL# Pin Changed State; 1 = BD_SEL# Changed State, 0 = BD_SEL# Unchanged
F5 FET Short Fault Occurred Indicates Potential FET Short was Detected on at Least One Supply, When ADC Measured Current
Sense Voltage Exceeded 7 LSB While FET was Off; 1 = FET was Shorted, 0 = FET is Good
F4 PGI Fault Occurred Indicates PGI Fault Occurred; 1 = PGI Fault Occurred, 0 = No PGI faults
F3 –12V Power Bad Fault Occurred Indicates –12V Power was Bad When V
EEOUT
Went High
1 = V
EEOUT
was High, 0 = No Power Bad Faults
F2 3.3V Power Bad Fault Occurred Indicates 3.3V Power was Bad When 3V
OUT
Went Low
1 = 3V
OUT
was Low, 0 = No Power Bad Faults
F1 5V Power Bad Fault Occurred Indicates 5V Power was Bad When 5V
OUT
Went Low
1 = 5V
OUT
was Low, 0 = No Power Bad Faults
F0 12V Power Bad Fault Occurred Indicates 12V Power was Bad When 12V
OUT
Went Low
1 = 12V
OUT
was Low, 0 = No Power Bad Faults
Table 13. GPIO Register G (06h) – Read/Write (GPIO2, GPIO3 Bits Apply Only to the UHF Package)
BIT NAME OPERATION
G7:6 GPIO Select Control Which GPIO Pin is Multiplexed to the GPIO Channel of ADC
G7 G6 GPIO
0 0 GPIO1 (Default)
0 1 GPIO1
1 0 GPIO2
1 1 GPIO3
G5 GPIO3 Output GPIO3 Pin Open-Drain Output State; 1 = High Impedance (Default), 0 = Pulls Low
G4 GPIO2 Output GPIO2 Pin Open-Drain Output State; 1 = High Impedance (Default), 0 = Pulls Low
G3 GPIO1 Output GPIO1 Pin Open-Drain Output State; 1 = High Impedance (Default), 0 = Pulls Low
G2 GPIO3 Input State of the GPIO3 Pin, Read Only Bit; 1 = GPIO3 High, 0 = GPIO3 Low
G1 GPIO2 Input State of the GPIO2 Pin, Read Only Bit; 1 = GPIO2 High, 0 = GPIO2 Low
G0 GPIO1 Input State of the GPIO1 Pin, Read Only Bit; 1 = GPIO1 High, 0 = GPIO1 Low
APPLICATIO S I FOR ATIO
WUU
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LTC4245
33
4245fa
Table 14. ADCADR Register H (07h) – Read/Write
BIT NAME OPERATION
H7:4 Reserved Not Used
H3:0 ADC Channel Address Selects Which ADC Channel to Measure On-Demand
H3 H2 H1 H0 ADC CHANNEL
000012V
IN
Voltage (Default)
0 0 0 1 12V Current Sense Voltage
001012V
OUT
Voltage
00115V
IN
Voltage
0 1 0 0 5V Current Sense Voltage
01015V
OUT
Voltage
01103V
IN
Voltage
0 1 1 1 3.3V Current Sense Voltage
10003V
OUT
Voltage
1001V
EEIN
Voltage
1 0 1 0 –12V Current Sense Voltage
1011V
EEOUT
Voltage
1 1 X X GPIO Voltage
Table 15. ADC Data Registers I to U (10h to 1Fh) – Read/Write
BIT NAME OPERATION
I7:0 12V
IN
Voltage Data 12V
IN
Pin Voltage Data. 8-Bit Data with 55mV LSB and 14.025V Full Scale
J7:0 12V
SENSE
Voltage Data 12V
IN
to 12V
SENSE
Current Sense Voltage Data. 8-Bit Data with 250µV LSB and 63.75mV Full Scale
K7:0 12V
OUT
Voltage Data 12V
OUT
Pin Voltage Data. 8-Bit Data with 55mV LSB and 14.025V Full Scale
L7:0 5V
IN
Voltage Data 5V
IN
Pin Voltage Data. 8-Bit Data with 22mV (or 15mV) LSB and 5.61V (or 3.825V) Full Scale
M7:0 5V
SENSE
Voltage Data 5V
IN
to 5V
SENSE
Current Sense Voltage Data. 8-Bit Data with 125µV LSB and 31.875mV Full Scale
N7:0 5V
OUT
Voltage Data 5V
OUT
Pin Voltage Data. 8-Bit Data with 22mV (or 15mV) LSB and 5.61V (or 3.825V) Full Scale
O7:0 3V
IN
Voltage Data 3V
IN
Pin Voltage Data. 8-Bit Data with 15mV LSB and 3.825V Full Scale
P7:0 3V
SENSE
Voltage Data 3V
IN
to 3V
SENSE
Current Sense Voltage Data. 8-Bit Data with 125µV LSB and 31.875mV Full Scale
Q7:0 3V
OUT
Voltage Data 3V
OUT
Pin Voltage Data. 8-Bit Data with 15mV LSB and 3.825V Full Scale
R7:0 V
EEIN
Voltage Data V
EEIN
Pin Voltage Data. 8-Bit Data with –55mV LSB and –14.025V Full Scale
S7:0 V
EESENSE
Voltage Data V
EESENSE
to V
EEIN
Current Sense Voltage Data. 8-Bit Data with 250µV LSB and 63.75mV Full Scale
T7:0 V
EEOUT
Voltage Data V
EEOUT
Pin Voltage Data. 8-Bit Data with –55mV LSB and –14.025V Full Scale
U7:0 GPIO Voltage Data GPIOn Pin Voltage Data. 8-Bit Data with 10mV LSB and 2.55V Full Scale
APPLICATIO S I FOR ATIO
WUU
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LTC4245IG#PBF

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Quad Hot Swap Contr. w/ADC and I2C
Lifecycle:
New from this manufacturer.
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