max5978 Maxim Integrated Products, Inc., max5978 Datasheet - Page 23

• Manufacturer Part Number: max5978
• Description: 0 To 16v, Hot-swap Controller With 10-bit Current, Voltage Monitor, And 4 Led Drivers
• Manufacturer: Maxim Integrated Products, Inc.

device can also deassert the PG output or turn off the
external MOSFET when the voltage is outside the critical
limits (see Figure 3). Table 28 shows the behavior for the
three possible states of the PROT input. Note that the
PROT input does not affect the device response to the
UV or OV warning digital comparators; it only determines
the system response to the critical digital comparators
(see Tables 3a, 3b, and 28).
Figure 3. Graphical Representation of Typical UV and OV Thresholds Configuration
Table 20. Undervoltage Warning Threshold Register Format (High-Order Bits)
Table 21. Undervoltage Warning Threshold Register Format (Low-Order Bits)
Description:
Register Title:
Register Addresses:
Description:
Register Titles:
Register Addresses:
uv1_9
R/W
Bit 7
Bit 7
—
R
Current, Voltage Monitor, and 4 LED Drivers
0 to 16V, Hot-Swap Controller with 10-Bit
uv1_8
Bit 6
Bit 6
R/W
—
R
V
MON
Undervoltage warning threshold low-order bits [1:0]
uv1th_Isb
0x1B
Undervoltage warning threshold high-order bits [9:2]
uv1th_msb
0x1A
uv1_7
Bit 5
Bit 5
R/W
—
R
uv1_6
Bit 4
Bit 4
R/W
—
R
NORMAL RANGE
uv1_5
Bit 3
R/W
Bit 3
—
R
In a typical application, the UV1 and OV1 thresholds
would be set closer to the nominal output voltage, and
the UV2 and OV2 thresholds would be set further from
nominal. This provides a “progressive” response to a
voltage excursion. However, the thresholds can be con-
figured in any arrangement or combination as desired to
suit a given application.
uv1_4
Bit 2
R/W
Bit 2
—
R
OV2 CRITICAL THRESHOLD
OV1 WARNING THRESHOLD
UV1 WARNING THRESHOLD
UV2 CRITICAL THRESHOLD
uv1_1
uv1_3
R/W
Bit 1
Bit 1
R/W
uv1_0
uv1_2
Bit 0
R/W
Bit 0
R/W
RESET
VALUE
RESET
VALUE
0x00
0x00
—
—
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