LTC2932 Linear Technology, LTC2932 Datasheet - Page 10

• Manufacturer Part Number: LTC2932
• Description: Confi gurable Six Supply Monitor
• Manufacturer: Linear Technology

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APPLICATIONS INFORMATION
LTC2932
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 confi gured to the desired input combination. The
comparators are enabled and supply monitoring begins.
Do not add capacitance to the VPG pin.
The two supply tolerance inputs, T0 and T1, confi gure the
global supply tolerance. Larger tolerances provide more
headroom by lowering the trip thresholds. Table 2 lists the
input combinations for each of the tolerance modes.
Table 1. Voltage Threshold Modes*
*V5 and V6 are always adjustable (ADJ).
10
MODE V1 (V) V2 (V) V3 (V) V4 (V) R1 (kΩ) R2 (kΩ)
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
Figure 3. Setting the Positive Adjustable Trip Point
V3, V4, V5 OR V6
3.3
3.3
3.3
3.3
3.3
3.3
5
5
5
5
5
5
5
5
5
5
3.3
3.3
2.5
2.5
2.5
3.3
3.3
3.3
2.5
2.5
2.5
3.3
3.3
3
3
3
V
TRIP
R3
1%
R4
1%
ADJ
ADJ
ADJ
ADJ
ADJ
1.5
2.5
2.5
2.5
2.5
1.8
1.8
1.8
1.8
1.8
1.8
–ADJ
–ADJ
–ADJ
–ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
1.8
1.5
1.5
+
–
0.5V
5% TOLERANCE MODE
Short
Open
93.1
86.6
78.7
71.5
66.5
53.6
47.5
40.2
34.8
22.1
16.2
9.53
LTC2932
59
28
Short
Open
9.53
16.2
22.1
34.8
40.2
47.5
53.6
66.5
71.5
78.7
86.6
93.1
28
59
2932 F03
0.000
0.094
0.156
0.219
0.281
0.344
0.406
0.469
0.531
0.594
0.656
0.719
0.781
0.844
0.906
V
V
REF
1
PG
Table 2. Tolerance Selection
Table 3. Suggested 1% Resistor Values for the ADJ Inputs
*See Figure 3.
Table 4. Suggested 1% Resistor Values for the –ADJ Inputs
*See Figure 4.
V
V
SUPPLY
SUPPLY
High
High
Low
Low
T0
–5.2
–10
–12
7.5
3.3
2.5
1.8
1.5
1.2
0.9
Figure 4. Setting the Negative Adjustable Trip Point
12
10
–2
–5
8
6
5
3
1
(V)
(V)
V
TRIP
R4
1%
R3
1%
High
High
Low
Low
T1
V
V
–11.30
TRIP
TRIP
–1.87
–4.64
–4.87
–9.31
11.25
4.725
3.055
2.325
1.685
1.410
1.120
0.933
0.840
2.82
9.4
7.5
5.6
7
(V)
(V)
VREF
V4
TOLERANCE (%)
12.5
LTC2932
7.5
10
5
R3 (kΩ)
R3 (kΩ)
2150
1780
1400
1300
1020
1130
86.6
68.1
187
464
487
931
845
511
464
365
237
182
124
2932 F04
V
REF
1.210
1.178
1.146
1.113
R4 (kΩ)
R4 (kΩ)
100
100
100
100
100
100
100
100
100
100
100
100
100
100
121
121
121
121
121
(V)
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