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LTC4261CGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
LTC4261/LTC4261-2
28
42612fd
For more information www.linear.com/LTC4261
Table 1. LTC4261 Device Addressing
DESCRIPTION
HEX DEVICE
ADDRESS BINARY DEVICE ADDRESS
LTC4261
ADDRESS PINS
h 6 5 4 3 2 1 0 R/W ADR1 ADR0
Mass Write 3E 0 0 1 1 1 1 1 0 X X
Alert Response 19 0 0 0 1 1 0 0 1 X X
0 20 0 0 1 0 0 0 0 X L L
1 22 0 0 1 0 0 0 1 X L NC
2 24 0 0 1 0 0 1 0 X H NC
3 26 0 0 1 0 0 1 1 X L H
4 28 0 0 1 0 1 0 0 X NC L
5 2A 0 0 1 0 1 0 1 X NC NC
6 2C 0 0 1 0 1 1 0 X H H
7 2E 0 0 1 0 1 1 1 X NC H
8 Single-Wire Broadcast Mode H L
H = Tie to INV
CC
; L = Tie to V
EE
; NC = No connect, open; X = Don’t care
Table 2. LTC4261 Register Address and Contents
REGISTER
ADDRESS*
REGISTER
NAME READ/WRITE DESCRIPTION
00h ST
ATUS (A) R System Status Information
01h FAULT (B) R/W Fault Log and PGIO Input
02h ALERT (C) R/W Controls Whether the ALERT Pin is Pulled Low After a Fault is Logged in the Fault Register
03h CONTROL (D) R/W Controls Whether the Part Retries After Faults, Set the On/Off Switch State
04h SENSE (E) R/W** ADC Current Sense Voltage Data (8 MSBs)
05h SENSE (F) R/W** ADC Current Sense Voltage Data (2 LSBs)
06h ADIN2/OV (G) R/W** ADC ADIN2/OV (SSOP/QFN) Voltage Data (8 MSBs)
07h ADIN2/OV (H) R/W** ADC ADIN2/OV (SSOP/QFN) Voltage Data (2 LSBs)
08h ADIN (I) R/W** ADC ADIN Voltage Data (8 MSBs)
09h ADIN (J) R/W** ADC ADIN Voltage Data (2 LSBs)
*Register address MSBs b7-b4 are ignored. **Writable if bit D5 set.
APPLICATIONS INFORMATION
LTC4261/LTC4261-2
29
42612fd
For more information www.linear.com/LTC4261
Table 3. STATUS Register A (00h)—Read Only
BIT NAME OPERATION
A7 FET On Indicates State of FET; 1 = FET On, 0 = FET Off
A6 PGIO Input Indicates State of the PGIO Pin when Configured to General Purpose Input: 1 = PGIO High, 0 = PGIO Low
A5 FET Short Indicates Potential FET Short if Current Sense Voltage Exceeds 2mV While FET is Off; 1 = FET is Shorted, 0 = FET is Not Shorted
A4 EN Indicates State of the EN Pin; 1 = EN Pin High, 0 = EN Pin Low
A3 Power Bad Indicates Power is Bad when PGI is High at the End of the PGI Check Timer; 1 = PGI High, 0 = PGI Low
A2 Overcurrent Indicates Overcurrent Condition; 1 = Overcurrent, 0 = Not Overcurrent
A1 Undervoltage Indicates Input Undervoltage when Both UVH and UVL are Low; 1 = UVH and UVL Low, 0 = UVH or UVL High
A0 Overvoltage Indicates Input Overvoltage when OV is High; 1 = OV High, 0 = OV Low
Table 4. FAULT Register B (01h)—Read/Write
BIT NAME OPERATION
B7 External Fault
Occurred
Latched to 1 if FLTIN Goes Low; 1 = FLTIN Low State Detected, 0 = FLTIN has Not Been Low
B6 PGIO Input
High Occurred
Latched to 1 if the PGIO Pin Goes High when Configured to General Purpose Input; 1 = PGIO High Detected,
0 = PGIO has Been Low
B5 FET Short Fault
Occurred
Indicates Potential FET Short was Detected When Measured Current Sense Voltage Exceeded 2mV While FET was Off;
1 = FET Short Fault Occurred, 0 = No FET Short Fault
B4 EN Changed
State
Indicates That a Board was Inserted or Extracted when
EN Changed State; 1 = EN Changed State, 0 = EN Unchanged
B3 Power Bad
Fault Occurred
Indicates Power was Bad when PGI was High at the End of the PGI Check Timer; 1 = Power Bad Fault Occurred,
0 = No Power Bad Fault
B2 Overcurrent
Fault Occurred
Indicates Over
current Fault Occurred; 1 = Overcurrent Fault Occurred, 0 = No Overcurrent Fault
B1 Undervoltage
Fault Occurred
Indicates Input Undervoltage Fault Occurred when Both UVH and UVL went Low; 1 = Undervoltage Fault Occurred,
0 = No Undervoltage Fault
B0 Overvoltage
Fault Occurred
Indicates Input Over
voltage Fault Occurred when OV was High; 1 = Overvoltage Fault Occurred, 0 = No Overvoltage Fault
Table 5. ALERT Register C (02h)—Read/Write
BIT NAME OPERATION
C7 External Fault
Alert
Enables Alert for External Fault When FLTIN was Low; 1 = Enable Alert, 0 = Disable Alert (Default)
C6 PGIO Output Output Data Bit to PGIO Pin when Configured as Output. Defaults to 0
C5 FET Short Alert Enables Alert for FET Short Fault; 1 = Enable Alert, 0 = Disable Alert (Default)
C4 EN State
Change Alert
Enables Alert when EN Changed State; 1 = Enable Alert, 0 Disable Alert (Default)
C3 Power Bad
Alert
Enables Alert for Power Bad Fault; 1 = Enable Alert, 0 Disable Alert (Default)
C2 Overcurrent
Alert
Enables Alert for Overcurrent Fault; 1 = Enable Alert, 0 Disable Alert (Default)
C1 Undervoltage
Alert
Enables Alert for Undervoltage Fault; 1 = Enable Alert, 0 Disable Alert (Default)
C0 Overvoltage
Alert
Enables Alert for Overvoltage Fault; 1 = Enable Alert, 0 Disable Alert (Default)
APPLICATIONS INFORMATION
LTC4261/LTC4261-2
30
42612fd
For more information www.linear.com/LTC4261
Table 6. CONTROL Register D (03h)—Read/Write
BIT NAME OPERATION
D7:6 PGIO Configure Configures Behavior of PGIO Pin
FUNCTION D6 D7 PGIO PIN
Power Good (Default) 0 0 Open Drain
Power Good 0 1 Open Drain
General Purpose Output 1 0 PGIO = C6
General Purpose Input 1 1 PGIO = Hi-Z
D5 Test Mode Enable Test Mode Halts ADC Operation and Enables Writes to ADC Registers; 1 = Enable Test Mode, 0 = Disable Test Mode (Default)
D4 Power Bad
Auto-Retry
Enables Auto-Retry After a Power Bad Fault; 1 = Retr
y Enabled, 0 = Retry Disabled (Default)
D3 FET On Control Turns FET On and Off; 1 = Turn FET On, 0 = Turn FET Off. Defaults to ON Pin State at End of Start-Up Debounce Delay
D2 Overcurrent
Auto-Retry
Enables Auto-Retry After an Over
current Fault; 1 = Retry Enabled (Default, LTC4261-2),
0 = Retry Disabled (Default, LTC4261)
D1 Undervoltage
Auto-Retry
Enables Auto-Retry After an Undervoltage Fault; 1 = Retry Enabled (Default), 0 = Retry Disabled
D0 Overvoltage
Auto-Retry
Enables Auto-Retry After an Over
voltage Fault; 1 = Retry Enabled (Default), 0 = Retry Disabled
Table 7. SENSE Registers E (04h) and F (O5h)—Read/Write
BIT NAME OPERATION
E7:0, F7:6 SENSE Voltage Data 10-Bit Data of Current Sense Voltage with 62.5µV LSB and 64mV Full Scale
F5:0 Reserved Always Returns 0, Not Writable
Table 8. ADIN2/OV Registers G (06h) and H (O7h)—Read/Write
BIT NAME OPERATION
G7:0, H7:6 ADIN2/OV Voltage Data 10-Bit Data of ADIN2/OV (SSOP/QFN) Voltage with 2.5mV LSB and 2.56V Full Scale
H5:0 Reserved Always Returns 0, Not Writable
Table 9. ADIN Registers I (08h) and J (O9h)—Read/Write
BIT NAME OPERATION
I7:0, J7:6 ADIN Voltage Data 10-Bit Data of ADIN Voltage with 2.5mV LSB and 2.56V Full Scale
J5:0 Reserved Always Returns 0, Not Writable
Table 10. ADC Channel Labeling for Single-Wire Broadcast Mode
CH1 CH0 ADC CHANNEL
0 0 SENSE Voltage
0 1 ADIN2/OV (SSOP/QFN) Voltage
1 0 ADIN Voltage
APPLICATIONS INFORMATION
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

LTC4261CGN#PBF

Mfr. #:
Buy LTC4261CGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Neg V Hot Swap Cntrs w/ ADC & I2C Mon in
Lifecycle:
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