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| 型号： | MIC2755YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 1/10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 |
MIC2755
General Description
The MIC2755 is composed of multiple comparators, a reset
pulse generator, and logic. It is designed for monitoring the
battery supply of portable digital systems, including PDAs
and pagers.
The MIC2755 detects three different battery states: battery
OK, low battery, and dead battery. The reset (/RST) output is
asserted for at least 700ms when a fresh battery is inserted.
The nonmaskable interrupt output (/NMI) is asserted when
the battery voltage is below the NTH threshold, indicating that
high-power system operations should not occur. If and when
battery voltage falls below the power-off threshold (PTH),
the reset output is asserted and latched, inhibiting system
operation until the battery is replaced or recharged.
All three voltage thresholds are set using external resistors.
A manual reset function can be implemented by connecting
a switch directly to the power on reset/manual reset [RTH(/
MR)] input. Internal circuitry detects switch activation and
generates a minimum 175ms debounced reset signal. The
MIC2755’s power supply input is separate from the detector
inputs to allow it to be powered from a down-stream voltage,
such as the output of a boost converter.
Inputs and outputs can be pulled above V DD (up to 7V
absolute maximum) without adverse effects or excessive
current draw.
Supply current is typically a low 2μA. Hysteresis is included
on all voltage detectors to prevent chattering due to noise.
The MIC2755 is available in the tiny 8-pin micro-small-outline
package.
Micrel, Inc.
MIC2755
Battery System Supervisor
Features
? Optimized for PDAs, pagers and
other hand-held devices.
? Detects multiple battery states:
- battery OK
- low battery
- dead battery
? Adjustable voltage thresholds
? High accuracy ±2% voltage thresholds
? Reset generation at power-on (700ms min.)
? Debounced manual reset function
? Internal logic prevents chatter if battery voltage
?uctuates
? Extremely low 2μA typical supply current
? I/Os can be pulled above V DD (7V absolute maximum)
? Immune to brief power supply transients
? Low cost
? 8-pin MSOP
V BAT(dead) = 2.9V 656k
TypicalApplication
V BAT(OK) = 3.6V
V BAT(low) = 3.1V
V BAT
576k
MIC2755
100k
Boost or Buck
Converter
IN OUT
EN 100k 100k
μController or
μProcessor
SUPPLY
344k
26.7k
VDD
PTH
/POF
/NMI
/NMI
SW
RESET
400k
NTH /RST
RTH(/MR) GND
/RST
GND
Supervised Boost Converter and Microcontroller or Microprocessor
Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
January 2006
1
MIC2755
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