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参数资料
| 型号： | MIC2755YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR BATT SYSTEM 8-MSOP |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 700 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2755YMMTR MIC2755YMMTR-ND |
V BAT(OK) = V REF ?
? R1 + R2 + R3 + R4 ?
?
?
R 4
V BAT(low) = V REF ?
? R1 + R2 + R3 + R4 ?
?
?
R3 + R4
V BAT(dead) = V REF ?
? R1 + R2 + R3 + R4 ?
?
?
R2 + R3 + R4
R1
572k
MIC2755
VDD
/POF
POF
RTH(/MR) GND
V BAT(low) = 3.1V = 1.24V ?
? 1M ? ?
? R 3 +R4 ?
V BAT(dead) = 2.9V = 1.24V ?
? 1M ? ?
? R2 + 55.6k + 344k ?
R6
R8
MIC2755
PTH
/NMI
NMI
V BAT(OK) = V REF ?
? R6 + R7 ?
?
?
R7
V BAT(low) = V REF ?
? R8 +R9 +R10 ?
?
?
R10
V BAT(dead) = V REF ?
? R8 +R9 +R10 ?
?
?
R9 + R10
V BAT(fresh) = 3.6V = 1.24V ?
? 1M ? ?
? R7 ?
V BAT(OK) = = 1.24V ?
? 1M ? ?
? R 4 ?
V BAT(low) = 3.1V = 1.24V ?
? 1M ? ?
? R10 ?
MIC2755
Applications Information
Outputs
Since the MIC2755 outputs are open-drain MOSFETs, most
applications will require pull-up resistors. The value of the
resistors should not be too large or leakage effects may
dominate.
Programming Thresholds
There are separate resistive-divider con?gurations for circuits
that require or do not require manual reset capability.
Con?guration Without Manual Reset
See Figure 1. The battery-OK threshold is calculated us-
ing:
?
The low-battery threshold is calculated using:
?
The dead-battery threshold is calculated using:
?
where, for all equations:
V REF = 1.24V
In order to provide the additional criteria needed to solve for
the resistor values, the resistors can be selected such that
they have a given total value, that is, R1 + R2 + R3 + R4 =
R total . A value such as 1MΩ for R total is a reasonable value
because it draws minimum battery current per resistor ladder
but has no signi?cant effect on system accuracy.
When working with large resistors, a small amount of leak-
age current can cause voltage offsets that degrade system
accuracy. The maximum recommended total resistance from
V BAT to ground is 3MΩ.
V BAT V BAT
100k 100k 100k
R2
28k
PTH /NMI NMI
R3 NTH /RST RST
55.6k
R4
344k
Figure 1. Example Circuit without Manual Reset
Once the desired trip points are determined, set the V BAT(OK)
threshold ?rst.
For a typical single-cell lithium ion battery, 3.6V is a reason-
able “OK threshold” because at 3.6V the battery is moderately
charged. Solving for R4:
3.6V ?
R4 = 344kΩ
Micrel, Inc.
To determine the resistor values for V BAT(low) threshold, set
R4 = 344kΩ and solve for R3.
?
R3 = 56k
Once R3 and R4 are determined, the equation for V BAT(dead)
can be used to determine R2. A single lithium-ion cell should
not be discharged below 2.5V. Many applications limit the
drain to 2.9V. Using 2.9V for the V BAT(dead) threshold allows
calculating the following resistor values.
?
R2 = 27.4k
R1 = 1MΩ – R2 – R3 – R4 = 572k
Con?guration With Manual Reset
See Figure 2. To use manual reset, the MIC2755 requires
a separate resistor ladder for the switch and fresh-battery
threshold. The remaining two thresholds are set by the three-
resistor ladder.
V BAT V BAT
100k 100k 100k
656k 573k
R7 R9? VDD /POF POF
344k 26.7k
NTH /RST RST
SW RTH(/MR) GND
R10?
400k
Figure 2. Example Circuit with Manual Reset
?
?
?
where, for all equations:
V REF = 1.24V
Once the desired trip points are determined, set R6 + R7 =
1MΩ and solve for R7.
?
R7 = 344k
R6 = 1MΩ – 344k = 656k
The remaining resistor values are solved in a similar manner
as the above.
1MΩ = R8 + R9 + R10
?
MIC2755
6
January 2006
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