
SMH4814
Preliminary Information
Summit Microelectronics, Inc
2080 2.0 07/21/05
35
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
0
1
0
0
X
X
X
X
OV Hysteresis = ((n+1)*32), where n is the value
stored in bits 7:4. OV Hystersis ranges from 32mV
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
to 512mV, with a default value (shown here) of
160mV
X
X
X
X
0
1
0
0
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
0
0
-
-
-
-
-
-
Current Regulation Offset is 12.5% (This is the
percentage above the Over Current trip point at
which current is regulated)
Current Regulation Offset is 25%
Current Regulation Offset is 50%
Current Regulation Offset is 100%
Current DAC Max Voltage is 128mV
Current DAC Max Voltage is 256mV (default)
Current DAC Max Voltage is 512mV
Current DAC Max Voltage is 1.024V
OV Reference is 2.048V
OV Reference is 2.864V
OV Reference is 3.072V
OV Reference is 4.096V
UV Reference is 2.048V
UV Reference is 2.864V
UV Reference is 3.072V
UV Reference is 4.096V
0
1
1
-
-
-
-
-
-
-
-
-
-
-
-
1
0
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0
0
1
1
-
-
-
-
-
-
-
-
-
-
-
0
1
0
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0
0
1
1
-
-
-
-
-
-
-
-
-
-
-
0
1
0
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0
0
1
1
-
-
-
-
-
-
-
-
-
-
-
0
1
0
1
CONFIGURATION REGISTERS (CONTINUED)