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| 型号： | MAX9921AUB/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC HALL EFFECT SENSOR DL 10UMAX |
| 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
Dual, 2-Wire Hall-Effect Sensor Interface
with Diagnostics
14
______________________________________________________________________________________
Applications Information
Hall-Effect Sensor Selection
The MAX9921 is optimized for use with 2-wire Hall-
effect switches or with 3-wire Hall-effect switches con-
nected as 2-wire (Figure 6). When using a 3-wire Hall
sensor, the resistor R is chosen so that the current
drawn by the Hall sensor crosses the MAX9921 current
threshold when the magnetic threshold of the Hall sen-
sor is exceeded.
Table 4 shows a partial list of Hall sensors (primarily 2-
wire) that can be used with the MAX9921. The DC
Electrical Characteristics Table gives tested IIH/IIL cur-
rent threshold limits for both a lower current range and
a higher current range which correspond to the selec-
tion of the RISET resistor value. This makes the
MAX9921 compatible with a wide array of 2- and 3-wire
Hall sensors.
Hall Input Bypass Capacitor
The MAX9921 is optimized for use with external protec-
tion 0.01F capacitors from both IN1 and IN2 to BAT.
These are essential to ensure robustness against auto-
motive transients. These capacitors may be tied to
GND instead of to BAT, but the connection to BAT is
recommended.
Low-Voltage Operation
To ensure correct operation of the Hall sensor at low
input voltages, it is important to consider the voltage
drop of the MAX9921 with low battery voltages. This
dropout voltage can be calculated using the formula:
VDROPOUT = IHALL x RPU
IHALL is the maximum current which must be supplied to
the Hall sensor and RPU is the internal resistance of the
MAX9921, nominally 50Ω (see the Input Pullup
Resistance vs. VBAT graph in the Typical Operating
Characteristics). As an example, assume the use of a
HAL573 sensor, which draws a maximum current of
17mA. The dropout voltage is then 850mV and the
approximate minimum voltage supplied to the Hall sensor
is 6V - 0.85V = 5.15V, which is higher than the minimum
operating voltage of 3.75V specified for the HAL573.
MAX9921
IN_
R
VCC
x_
GND
Figure 6. 3-Wire Hall-Effect Switches Configured as 2-Wire
PART
MANUFACTURER
WEBSITE
COMMENT
HAL573-6
Micronas
www.micronas.com
2-wire
HAL556/560/566
Micronas
www.micronas.com
2-wire
HAL581/584
Micronas
www.micronas.com
2-wire
A1140/1/2/3
Allegro
www.allegromicro.com
2-wire
A1180/81/82/83
Allegro
www.allegromicro.com
2-wire
Table 4. Partial List of Compatible Hall Switches
Note: The Hall switches listed above are supported by the MAX9921 using RISET = 63.4kΩ.
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相关代理商/技术参数 |
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| 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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