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参数资料
| 型号： | LTC2910CGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MON OCTAL 16-SSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 8 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 6 ms |
| 电压 - 阀值： | 8 种可选阀值组合 |
| 工作温度： | 0°C ~ 70°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) |
LTC2910
APPLICATIONS INFORMATION
Voltage Monitoring
Table 1. Voltage Polarity Programming (V RT = 0.5V Typical)
The LTC2910 is a low power octal voltage monitoring
circuit with eight individual undervoltage monitor inputs.
A timeout period that holds a reset after all faults have
cleared is adjustable using an external capacitor and is
disabled, by tying TMR to V CC .
Each voltage monitor is compared to a ?xed 0.5V reference
SEL
V CC
Open
GND
V7 INPUT
Positive
V7 < V RT → UV
Positive
V7 < V RT → UV
Negative
V7 > V RT → UV
V8 INPUT
Positive
V8 < V RT → UV
Negative
V8 > V RT → UV
Negative
V8 > V RT → UV
for detecting undervoltage conditions. When con?gured
to monitor a positive voltage V m , the application is con-
nected as shown in Figure 1. For negative inputs V m is
connected as shown in Figure 2. R A is now connected to
the REF pin and R B remains connected to the monitored
voltage V m .
Using the con?gurations in Figures 1 and 2, a UV condi-
tion will result when the magnitude of the voltage at V m
is less than its designed threshold.
Polarity Selection
The three-state polarity-select pin (SEL) selects one of three
possible polarity combinations for the input thresholds,
as described in Table 1. When an input is con?gured for
negative supply monitoring, a reset condition occurs when
the supply voltage is less negative than the con?gured
threshold.
2-Step Design Procedure
The following 2-step design procedure allows selecting
appropriate resistances to obtain the desired UV trip point
for the positive voltage monitor circuit in Figure 1 and the
negative voltage monitor circuit in Figure 2.
For positive supply monitoring, V m is the desired nominal
operating voltage, I m is the desired nominal current through
the resistive divider, and V UV is the desired undervoltage
trip point.
For negative supply monitoring, to compensate for the 1V
reference, 1V must be subtracted from V m and V UV before
using each in the following equations.
1. Choose R A to obtain the desired UV trip point
R A is chosen to set the desired trip point for the
undervoltage monitor.
? m
Thethree-stateinputpinSELisconnectedtoGND,V CC ,or
left unconnected during normal operation. When the pin
is left unconnected, the maximum leakage allowed from
R A =
0.5 V
I m
V
V UV
(1)
the pin is ±10μA to ensure it remains in the open state.
Table 1 shows the three possible selections of polarity
based on the SEL pin connection.
REF
+
LTC2910
V m
R B
LTC2910
R A
–
+
–
1V
Vn
UVn
Vn
UVn
R A
+
–
0.5V
R B
+
–
0.5V
V m
2910 F01
Figure 1. Positive UV Monitoring Con?guration
2910 F02
Figure 2. Negative UV Monitoring Con?guration
2910fc
8
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