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参数资料
| 型号： | LTC2901-3IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR QUAD SUPP PROG 16SSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 5 ms |
| 电压 - 阀值： | 16 种可选阀值组合 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LTC2901
APPLICATIO S I FOR ATIO
Power-Up
The greater of V1, V2 is the internal supply voltage (V CC ).
On power-up, V CC will power the drive circuits for the RST
LTC2901
V REF
V PG
GND
12
11
10
R1
1%
R2
1%
and the COMPX pins. This ensures that the RST and COMPX
outputs will be low as soon as V1 or V2 reaches 1V. The
RST and COMPX outputs will remain low until the part is
programmed. After programming, if any one of the V X inputs
is below its programmed threshold, RST will be a logic low.
Once all the V X inputs rise above their thresholds, an inter-
nal timer is started and RST is released after the pro-
grammed delay time. If V CC < (V3 – 1) and V CC < 2.4V, the
V3 input impedance will be low (1k Ω typ).
Monitor Programming
The LTC2901 input voltage combination is selected by
placing the recommended resistive divider from V REF to
GND and connecting the tap point to V PG , as shown in
Figure 4. Table 1 offers recommended 1% resistor values
for the various modes. The last column in Table 1 specifies
optimum V PG /V REF ratios ( ± 0.01) to be used when pro-
gramming with a ratiometric DAC.
During power-up, once V1 or V2 reaches 2.4V max, the
monitor enters a programming period of approximately
Table 1. Voltage Threshold Programming
2901 F04
Figure 4. Monitor Programming
150 μ s during which the voltage on the V PG pin is sampled
and the monitor is configured to the desired input combi-
nation. Do not add capacitance to the V PG pin. Immediately
after programming, the comparators are enabled and
supply monitoring will begin.
Supply Monitoring
The LTC2901 is a low power, high accuracy program-
mable quad supply monitoring circuit with four nondelayed
monitor outputs, a common reset output and a watchdog
timer. Watchdog and reset timing are both adjustable
using external capacitors. Single pin programming selects
1 of 16 input voltage monitor combinations. All four
voltage inputs must be above predetermined thresholds
for the reset not to be invoked. The LTC2901 will assert the
reset and comparator outputs during power-up, power-
down and brownout conditions on any one of the voltage
inputs.
The inverting inputs on the V3 and/or V4 comparators are
MODE
V1 (V) V2 (V) V3 (V) V4 (V) R1 (k Ω ) R2 (k Ω )
V PG
V REF
set to 0.5V when the positive adjustable modes are selected
(Figure 5). The tap point on an external resistive divider,
0
1
2
5.0
5.0
3.3
3.3
3.3
2.5
ADJ
ADJ
ADJ
ADJ
–ADJ
ADJ
Open
93.1
86.6
Short
9.53
16.2
0.000
0.094
0.156
connected between the positive voltage being sensed and
ground, is connected to the high impedance noninverting
inputs (V3, V4). The trip voltage is calculated from:
V TRIP = 0 . 5 V ? 1 +
?
3
4
5
3.3
3.3
5.0
2.5
2.5
3.3
ADJ
1.5
2.5
–ADJ
ADJ
ADJ
78.7
71.5
66.5
22.1
28.0
34.8
0.219
0.281
0.344
?
?
R 3 ?
R 4 ?
6
7
8
9
10
11
12
13
5.0
5.0
5.0
5.0
3.3
3.3
3.3
5.0
3.3
3.3
3.0
3.0
2.5
2.5
2.5
3.3
2.5
2.5
2.5
ADJ
1.8
1.8
1.8
1.8
1.8
1.5
ADJ
ADJ
1.5
ADJ
–ADJ
–ADJ
59.0
53.6
47.5
40.2
34.8
28.0
22.1
16.2
40.2
47.5
53.6
59.0
66.5
71.5
78.7
86.6
0.406
0.469
0.531
0.594
0.656
0.719
0.781
0.844
In the negative adjustable mode, the noninverting input on
the V4 comparator is connected to ground (Figure 6). The
tap point on an external resistive divider, connected be-
tween the negative voltage being sensed and the V REF pin,
is connected to the high impedance inverting input (V4).
V REF provides the necessary level shift required to operate
at ground. The trip voltage is calculated from:
V TRIP = – V REF ?
? ; V
14
15
5.0
5.0
3.3
3.0
1.8
1.8
ADJ
ADJ
9.53
Short
93.1
Open
0.906
1.000
? R 3 ?
? R 4 ? REF
= 1 . 210 V No min al
2901fb
11
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