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| 型号： | MAX9940AXK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC OVERVOLTAGE PROTECTOR SC70-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 电压 - 工作： | 5.5V |
| 电压 - 箝位： | 28V |
| 技术： | 混合技术 |
| 功率（瓦特）： | 245mW |
| 电路数： | 1 |
| 应用： | 通用 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SC-70-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
| 其它名称： | MAX9940AXK+TDKR |
Signal-Line Overvoltage Protector
for Low-Voltage Devices
V DD = 3.3V
ENABLE
V CC
MICROCONTROLLER
R P
2k Ω
MAX9940
1-Wire
DATA
DEVICE
Rx
INT
EXT
Rx
GND
Tx
Tx
Figure 1. Recommended Scheme for Battery-Operated Devices that Need to Shut Down the MAX9940 and Prevent Power Draw
During Short to GND Faults
In all three schemes, the MAX9940 protects the micro-
controller from both DC fault voltages above V CC and
ESD strikes on EXT. The difference in the three
schemes lies in the impact on power consumption in
battery-operated devices during normal and short to
GND fault conditions.
Figure 1 shows a recommended configuration for battery-
operated devices that need to conserve power both on
a continuous basis as well as during short to GND fault
conditions. In this scheme, the ENABLE port of a micro-
controller supplies the quiescent current for the
MAX9940 as well as that required for digital communi-
cation (i.e., R P pullup resistor). By forcing a 0 on the
ENABLE digital output port of the microcontroller, the
MAX9940 is in a zero-power shutdown mode, while also
preventing any power drain to occur in the event of a
short to GND fault on EXT. As stated earlier, EXT main-
tains the ability to withstand DC voltages up to 28V
even when V CC = 0.
In Figure 2, the ENABLE port of a microcontroller pow-
ers the MAX9940. The low 13μA operating current
allows standard digital I/O ports to easily supply the
operating current of the MAX9940 without any substan-
tial voltage drop (V OH ≈ V DD ). By forcing a 0 on the
ENABLE port of the microcontroller, the MAX9940 can
be put into a zero-power mode, thus conserving battery
power. It should be noted that there is no internal ESD
diode from INT to V CC . This allows the voltage at INT to
stay at V DD even though V CC = 0, thus drawing no cur-
rent from R P or the battery. However, an internal diode
does exist from INT to EXT, and therefore, in the event
of a short to GND fault on EXT, current is drawn through
R P , causing a power drain from V DD , and can potential-
ly reduce battery life.
In Figure 3, V DD powers the MAX9940 directly, and
consumes quiescent current on a continuous basis. In
this mode, the internal FET between INT and EXT is
kept on as long as the voltage on EXT is below V CC . As
a result, in the event of a short to GND fault on EXT,
current is drawn through RP, causing a power drain
from V DD and potentially reducing battery life.
6
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| MAX9940EVKIT+ | 功能描述:电源管理IC开发工具 MAX9940 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX9943ATT+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP 19V/38V 6TDFN EP - Rail/Tube |
| MAX9943ATT+T | 功能描述:精密放大器 Precision Op Amp RoHS:否 制造商:Maxim Integrated 每芯片的通道数量: 输入补偿电压:0.25 mV at +/- 5 V 输入电压范围（最大值）: 安装风格: 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX9943AUA+ | 功能描述:精密放大器 Precision Op Amp RoHS:否 制造商:Maxim Integrated 每芯片的通道数量: 输入补偿电压:0.25 mV at +/- 5 V 输入电压范围（最大值）: 安装风格: 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX9943AUA+T | 功能描述:精密放大器 Precision Op Amp RoHS:否 制造商:Maxim Integrated 每芯片的通道数量: 输入补偿电压:0.25 mV at +/- 5 V 输入电压范围（最大值）: 安装风格: 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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