ISL78226 Datasheet, PDF (62/94 Pages) Intersil Corporation – Cycle-by-cycle peak current limiting

ISL78226
BAT12 Input Undervoltage Limit Fault Control Bit (0xB7: Bit 7:6)
If the individual fault response enable/disable control bit (0xB0[7]) is “1”, the device selects the fault response when BAT12 becomes
lower than the second level of Undervoltage threshold. If the individual fault response enable/disable control bit (0xB0[7]) is “0”, the
“MODE” pin setting will be used for the fault control and this register setting will be ignored.
BIT1
BIT0
DESCRIPTION
0
0
Flagging only (Default)
When BAT12 input voltage becomes lower than the second undervoltage threshold, the corresponding fault status
register (0xD7[3]) will be set to “1”, and XALERT will be pulled low. The system continues to operate. No hiccup or
latch-off responses.
0
1
Hiccup (Auto Restart)
When BAT12 input voltage becomes lower than the second undervoltage threshold, the corresponding fault status
register (0xD7[3]) will be set to “1”, and XALERT will be pulled low. At the same time, the system stops PWM
switching. The PWM switching will recover automatically 500ms (typical) after the undervoltage condition is
removed.
1
0
Latch-off
When BAT12 input voltage becomes lower than the second undervoltage threshold, the corresponding fault status
register (0xD7[3]) will be set to “1”, and XALERT will be pulled low. At the same time, the system stops PWM
switching. The PWM switching will not recover automatically when the undervoltage condition is removed. To recover
the switching, toggle PWM_EN or EN.
1
1
Flagging only (same as “0,0”)
INDIVIDUAL FAULT RESPONSE CONTROL REGISTER 7 (0XB8)
Definition: BAT48 input and output overvoltage and undervoltage limit (protection) response setting
Data Length in Bytes: 1
Data Format: Bit Field
Typical: R/W
Protectable: Yes
Default Value: 00h
Units: N/A
Register Name
Format
Bit Position
Access
Function
Default Value
Individual Fault Response Control Register 7 (0xB8)
Bit Field
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BAT48 Input Undervoltage BAT48 Input Overvoltage BAT48 Output Undervoltage BAT48 Output Overvoltage
Limit Fault Control Bits Limit Fault Control Bits
Limit Fault Control Bits
Limit Fault Control Bits
0
0
0
0
0
0
0
0
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FN8887.0
November 7, 2016