SMH4814 Datasheet, PDF (35/44 Pages) Summit Microelectronics, Inc. – Dual Feed Active-ORing Programmable Hot Swap Controller

CONFIGURATION REGISTERS (CONTINUED)
SMH4814
Preliminary Information
Register R08 – OV/UV Hysteresis.
Bits D[7:4] control the OV Hysteresis Voltage level. Bits D[4:0] control the UV Hysteresis Voltage level.
Register R08
D7 D6 D5 D4 D3 D2 D1 D0
Action
OV Hysteresis = ((n+1)*32), where n is the value
stored in bits 7:4. OV Hystersis ranges from 32mV
0
1
0
0
X
X
X
X to 512mV, with a default value (shown here) of
160mV
UV Hysteresis = ((n+1)*32), where n is the value
stored in bits 7:4. UV Hystersis ranges from 32mV
X
X
X
X
0
1
0
0 to 512mV, with a default value (shown here) of
160mV
Register R09 – Current regulation Offsets, Current DAC max and OV/UV reference voltage
Bits D[7:6] control the Current Regulation Offset. Bits D[5:4] control the Current DAC Max Voltage. Bits D[3:2] control
the OV reference voltage range. Bits D[1:0] control the UV reference voltage range.
Register R09
D7 D6 D5 D4 D3 D2 D1 D0
Action
Current Regulation Offset is 12.5% (This is the
0
0
-
-
-
-
-
- percentage above the Over Current trip point at
which current is regulated)
0
1
-
-
-
-
-
- Current Regulation Offset is 25%
1
0
-
-
-
-
-
- Current Regulation Offset is 50%
1
1
-
-
-
-
-
- Current Regulation Offset is 100%
-
-
0
0
-
-
-
- ^{Current DAC Max Voltage is 128mV}
-
-
0
1
-
-
-
- Current DAC Max Voltage is 256mV (default)
-
-
1
0
-
-
-
- Current DAC Max Voltage is 512mV
-
-
1
1
-
-
-
- Current DAC Max Voltage is 1.024V
-
-
-
-
0
0
-
- OV Reference is 2.048V
-
-
-
-
0
1
-
- OV Reference is 2.864V
-
-
-
-
1
0
-
- OV Reference is 3.072V
-
-
-
-
1
1
-
- OV Reference is 4.096V
-
-
-
-
-
-
0
0 UV Reference is 2.048V
-
-
-
-
-
-
0
1 UV Reference is 2.864V
-
-
-
-
-
-
1
0 UV Reference is 3.072V
-
-
-
-
-
-
1
1 UV Reference is 4.096V
Summit Microelectronics, Inc
2080 2.0 07/21/05
35