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参数资料
| 型号： | MAX9921AUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR HALL EFFECT 10-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 霍尔效应传感器 |
| 输入类型： | 电压 |
| 输出类型： | 逻辑 |
| 接口： | 2 线 |
| 电流 - 电源： | 1.3mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
MAX9921
Hall Input Short-to-Ground
The Hall input shorted-to-ground fault is effectively a
latched condition if the input remains loaded by the Hall
switch when the shorting condition is removed. The cur-
rent required to power the Hall switch is shut off and only
a 50A pullup current remains. The Hall input can be
manually re-energized or it can be re-energized by the
ECU. A falling edge at DIAG initiates a restart with a
blanking cycle of any Hall input that has been shut down
due to the shorted-to-ground condition. During startup or
restart, it is possible for a Hall input to charge up an exter-
nal capacitance of 0.02F without tripping into a shorted-
to-ground latched state. All other fault conditions are not
latched and when these other faults are removed, ERR
goes high and the Hall input is again functional.
Manual Method for Re-Energizing Hall Sensor
and Means for Diagnosing an Intermittent
Hall Sensor Connection
Figure 4 shows the behavior of the MAX9921 when a
Hall input is open. Figure 5 shows the behavior of the
MAX9921 when the open input is reconnected to a Hall
sensor. Figures 4 and 5 demonstrate how a shorted-to-
ground Hall input can be reset.
Resetting a shorted-to-ground Hall input involves
three steps:
1) Relieve the short to ground at the Hall sensor.
2) Disconnect the Hall input from the Hall sensor (open
input fault condition).
3) Reconnect the Hall input to the Hall sensor.
The MAX9921 restarts the Hall input with a blanking
cycle. If the Hall input is disconnected from the Hall
sensor for 10ms, it allows the Hall input to be pulled up
by the 50A pullup current to register the open-input
fault condition. Then, reconnecting the Hall input to the
Hall sensor restarts the Hall input with a blanking cycle.
This provides a manual means of re-energizing a Hall
input without having to resort to the ECU to reset it. This
also demonstrates that an intermittent connection to a
Hall sensor can recover without intervention of the ECU.
This gives the ECU a means of diagnosing an intermit-
tent connection to a Hall sensor by using the diagnostic
mode to detect a diagnostic sequence of “open-circuit”
to “blanking cycle” to “no fault.”
Dual, 2-Wire Hall-Effect Sensor Interface
with Diagnostics
12
______________________________________________________________________________________
14V
VIN_
IIN_
0V
HALL INPUT
SHORT TO
GROUND FAULT
INDICATED
HALL INPUT
OPEN-CIRCUIT
FAULT INDICATED
TIME
VBAT - 25mV
5mV/ms
TIME
50
A
0A
HALL INPUT
DISCONNECTED
FROM SENSOR
Figure 4. Hall Input Ramps to Open-Circuit Fault When Short to Ground is Relieved
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9921EVKIT+ | 功能描述:界面开发工具 MAX9921 Eval Kit RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| MAX9922ABT+T | 制造商:Maxim Integrated Products 功能描述:ULTRA-PRECISION, HIGH-SIDE CURRENT-SENSE AMPLIFIERS - Tape and Reel |
| MAX9922AUB+ | 功能描述:电流灵敏放大器 Current-Sense Amplifier RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX9922AUB+T | 功能描述:电流灵敏放大器 Current-Sense Amplifier RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX9922EUB+ | 功能描述:电流灵敏放大器 Current-Sense Amplifier RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
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