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SMH4814 Datasheet, PDF (37/44 Pages) Summit Microelectronics, Inc. – Dual Feed Active-ORing Programmable Hot Swap Controller
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CONFIGURATION REGISTERS (CONTINUED)
SMH4814
Preliminary Information
Register R0D – Power Down or Forced Shutdown, Fault or no Fault
These bits control how the given inputs affect the power off.
Register R0D
D7 D6 D5 D4 D3 D2 D1 D0
Action
0
-
-
-
-
-
-
- FB low w/ FET on: Power Down
1
-
-
-
-
-
-
- FB low w/ FET on: Forced Shutdown
-
0
-
-
-
-
-
- ENTS low w/ FET on: Power Down
-
1
-
-
-
-
-
- ENTS low w/ FET on: Forced Shutdown
-
-
0
-
-
-
-
- OV condition: Power Down
-
-
1
-
-
-
-
- OV condition: Forced Shutdown
-
-
-
0
-
-
-
- UV condition: Power Down
-
-
-
1
-
-
-
- UV condition: Forced Shutdown
-
-
-
-
0
-
-
- FB low w/ FET on: don’t set FAULT
-
-
-
-
1
-
-
- FB low w/ FET on: set FAULT
-
-
-
-
-
0
-
- ENTS low w/ FET on: don’t set FAULT
-
-
-
-
-
1
-
- ENTS low w/ FET on: set FAULT
-
-
-
-
-
-
0
- OV condition: don’t set FAULT
-
-
-
-
-
-
1
- OV condition: set FAULT
-
-
-
-
-
-
-
0 UV condition: don’t set FAULT
-
-
-
-
-
-
-
1 UV condition: set FAULT
Register R0E – Slew Rate Control
Bits D[7:6] control the PUPD Time Slot. Bits D[5:4] control the PUPC Time Slot. Bits D[3:2] control the PUPB Time
Slot. Bits D[1:0] control the PUPA Time Slot.
Register R0E
D7 D6 D5 D4 D3 D2 D1 D0
Action
0
0
-
-
-
-
-
- Scale Factor SLEW_CNTL to Curr. Reg. = 1/100
0
1
-
-
-
-
-
- Scale Factor SLEW_CNTL to Curr. Reg. = 1/50
1
0
-
-
-
-
-
- Scale Factor SLEW_CNTL to Curr. Reg. = 1/20
1
1
-
-
-
-
-
- Scale Factor SLEW_CNTL to Curr. Reg. = 1/10
-
-
0
-
-
-
-
-
Use SLEW_CNTL for Current Regulation Voltage =
Curr. Reg. Voltage is fixed by registers R09 and R0A
-
-
1
-
-
-
-
-
Use SLEW_CNTL for Current Regulation Voltage =
Curr. Reg. Voltage = SLEW CNTL*scale factor D[7:6]
-
-
-
0
-
-
-
-
Use SLEW_CNTL for FET GATE Current Ramp =
FET GATE current is fixed at Max Current
-
-
-
1
-
-
-
-
Use SLEW_CNTL for FET GATE Current Ramp =
FET GATE current = (Max Current)*(SLEW CNTL)/2.5
Max FET GATE Current = (8+(n X 8))µA
-
-
-
-
1
1
1
1 Largest FET GATE Current = (8+(15 X 8)) = 136µA
-
-
-
-
0
0
0
0 Lowest FET GATE Current = (8+(0 X 8)) = 8µA
-
-
-
-
1
0
1
1 FET GATE Current = (8+(11 X 8)) = 96µA
Summit Microelectronics, Inc
2080 2.0 07/21/05
37
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