LTC2930H データシートの表示（PDF） - Linear Technology

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LTC2930H

Configurable Six Supply Monitor with Adjustable Reset Timer, Manual Reset

Linear Technology 

LTC2930

APPLICATIONS INFORMATION

LTC2930

VREF

VPG

GND

R1

1%

R2

1%

2930 F02

Figure 2. Mode Selection

Monitor Configuration

Select the LTC2930 input voltage combination by placing

the recommended resistive divider from VREF to GND and

connecting the tap point to VPG, as shown in Figure 2.

Table 1 offers recommended 1% resistor values for each

of the 16 modes. The last column in Table 1 specifies

optimum VPG/VREF ratios (± 0.01), when configuring with

a ratiometric DAC.

At power-up, once V1 or V2 reaches 2.4V, the monitor

enters a setup period of approximately 150μs. During the

setup time, the voltage on the VPG pin is sampled and the

monitor is configured to the desired input combination. The

comparators are enabled and supply monitoring begins.

Do not add capacitance to the VPG pin.

VTRIP

R3

1%

V3, V4, V5 OR V6

R4

1%

LTC2930

+– 0.5V

Table 2. Suggested 1% Resistor Values for the ADJ Inputs

VSUPPLY (V)

12

VTRIP (V)

11.25

R3 (kΩ)

2150

R4 (kΩ)

100

10

9.4

1780

100

8

7.5

1400

100

7.5

7

1300

100

6

5.6

1020

100

5

4.725

845

100

3.3

3.055

511

100

3

2.82

464

100

2.5

2.325

365

100

1.8

1.685

237

100

1.5

1.410

182

100

1.2

1.120

124

100

1

0.933

86.6

100

0.9

0.840

68.1

100

*See Figure 3.

Table 3. Suggested 1% Resistor Values for the –ADJ Inputs

VSUPPLY (V)

–2

VTRIP (V)

–1.87

R3 (kΩ)

187

R4 (kΩ)

121

–5

–4.64

464

121

–5.2

–4.87

487

121

–10

–9.31

931

121

–12

–11.30

1130

121

*See Figure 4.

VTRIP

=

0.5V

•



1+

R3

R4





2930 F03

Figure 3. Setting the Positive Adjustable Trip Point

Using The Adjustable Thresholds

The reference inputs on the V3 and/or V4 comparators

are set to 0.5V when the positive adjustable modes are

selected (Figure 3). The reference inputs on the V5 and V6

comparators are always set to 0.5V. The tap point on an

external resistive divider, connected between the positive

voltage being sensed and ground, is connected to the high

impedance, adjustable inputs (V3, V4, V5, V6). Calculate

the trip voltage from:

8

In the negative adjustable mode, the reference level on the

V4 comparator is connected to ground (Figure 4). The tap

point on an external resistive divider, connected between

the negative voltage being sensed and the VREF pin, is

R4

1%

V4

R3

1%

VTRIP

VREF

LTC2930

2930 F04

Figure 4. Setting the Negative Adjustable Trip Point

2930fa

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