ISL78226 Datasheet, PDF (75/94 Pages) Intersil Corporation – Cycle-by-cycle peak current limiting

ISL78226
Register Write Enable/Disable Control Bit (0x10: Bit 7)
Enable/disable register access..
BIT7
DESCRIPTION
0
Enable writes to all registers
1
Disable all writes to the registers except to the WRITE_PROTECT command (default)
Status Registers
Status registers indicate the operation and error status of the device. An external MCU can poll the status anytime to confirm the operation
status of the device. Also, when any fault condition is detected, the XALERT pin will be pulled down to notice the event of a fault to external
MCU. Following the XALERT low signal, the MCU can find the fault location by reading the Fault Index register (0xC0) and the corresponding
resistors that are indicated by the Fault Index register. The fault flag initiated at the Fault Status registers are kept until it is cleared by the
“Clear All” command or by overriding the same value to the target register by the external MCU. To clear the faults, the Write Protection
control bit must be set to “Write Enable” before sending the “Clear All” command or overriding the same value to the target register.
FAULT INDEX REGISTER (0XC0)
Definition: Indicates the register location having the fault flags.
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
FAULT INDEX REGISTER (0XC0)
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
XALERT flag
indicator
Fault on
“Fault Status
Register-7”
(0xD8)
Fault on
“Fault Status
Register-6”
(0xD7)
Fault on
“Fault Status
Register-5”
(0xD6)
Fault on
“Fault Status
Register-4”
(0xD5)
Fault on
“Fault Status
Register-3”
(0xD4)
Fault on
“Fault Status
Register-2”
(0xD3)
Fault on
“Fault Status
Register-1”
(0xD2)
0
0
0
0
0
0
0
0
Fault Indicator - Fault on “Fault Status Register-1 (0xD2)” (0xC0: Bit 0)
Indicates one or more faults are detected at “Fault Status Register-1 (0xD2)” if this bit is set to “1”.
0XC0 BIT0
DESCRIPTION
0
OK: No fault at “Fault Status Register-1 (0xD2)”
1
Faults are detected at “Fault Status Register-1 (0xD2)”
Fault Indicator - Fault on “Fault Status Register-2 (0xD3)” (0xC0: Bit 1)
Indicates one or more faults are detected at “Fault Status Register-2 (0xD3)” if this bit is set to “1”.
0XC0 BIT1
DESCRIPTION
0
OK: No fault at “Fault Status Register-2 (0xD3)”
1
Faults are detected at “Fault Status Register-2 (0xD3)”
Fault Indicator - Fault on “Fault Status Register-3(0xD4)” (0xC0: Bit 2)
Indicates one or more faults are detected at “Fault Status Register-3 (0xD4)” if this bit is set to “1”.
0XC0 BIT2
DESCRIPTION
0
OK: No fault at “Fault Status Register-3 (0xD4)”
1
Faults are detected at “Fault Status Register-3 (0xD4)”
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FN8887.0
November 7, 2016