ISL78226 Datasheet, PDF (50/94 Pages) Intersil Corporation – Cycle-by-cycle peak current limiting

ISL78226
PWM_INV (0xB0: Bit 5)
Invert PWM output polarity.
VALUE
0 (Default)
1
DESCRIPTION
Normal polarity
When PWMx output is “High”, expects to turn on high-side FETs and turn off low-side FETs.
When PWMx output is “Low”, expects to turn on low-side FETs and turn off high-side FETs.
When PWMx output is “middle” (when 3-state PWM output is used), turn off both high-side and low side FETs.
Inverted polarity
When PWMx output is “High”, expects to turn on low-side FETs and turn off high-side FETs.
When PWMx output is “Low”, expects to turn on high-side FETs and turn off low-side FETs.
When PWMx output is “middle” (when 3-state PWM output is used), turn off both high-side and low side FETs.
ATRK/DTRK Control Bit (0xB0: Bit 4)
Select the track pin input mode as either analog or digital.
VALUE
0 (Default)
1
Digital tracking input
Analog tracking input
DESCRIPTION
INDIVIDUAL FAULT RESPONSE CONTROL REGISTER 1 (0XB1)
Definition: BAT12 input and output overvoltage and undervoltage fault 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 1 (0XB1)
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
BAT12 Input Undervoltage BAT12 Input Overvoltage BAT12 Output under BAT12 Output Overvoltage
Fault Control Bits
Fault Control Bits
Voltage Fault Control Bits
Fault Control Bits
0
0
0
0
0
0
0
0
BAT12 Output Overvoltage Fault (Warning) Control Bit (0xB1: Bit 1:0)
When the individual fault response enable/disable control bit (0xB0[7]) is “1”, the device selects the fault response when BAT12
exceeds the first level of overvoltage threshold. When 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 output voltage exceeds the first overvoltage threshold, the corresponding fault status register (0xD2[0])
will be set to “1”, and XALERT will be pulled low. System continues to operate. No hiccup or latch-off responses.
0
1
Hiccup (Auto Restart)
When BAT12 output voltage exceeds the first overvoltage threshold, the corresponding fault status register (0xD2[0])
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 overvoltage condition is removed.
1
0
Latch-off
When BAT12 output voltage exceeds the first overvoltage threshold, the corresponding fault status register (0xD2[0])
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 overvoltage condition is removed. To recover the switching, toggle
PWM_EN or EN.
1
1
Flagging only (same as “0,0”)
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FN8887.0
November 7, 2016