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MAX9921

更新时间： 2024-11-15 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 传感器
页数 文件大小 规格书
16页 740K
描述
双通道、2线霍尔传感器接口，具有诊断功能

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MAX9921 数据手册

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19-4119; Rev 1; 1/10  
Dual, 2-Wire Hall-Effect Sensor Interface  
with Diagnostics  
MAX921  
General Description  
Features  
o Withstands 60V at BAT Supply and Hall Inputs  
o 6V to 18V Operating Voltage Range  
The MAX9921 provides a single chip solution to interface  
two 2-wire Hall-effect sensors to a low-voltage micro-  
processor (µP). This device supplies and monitors the cur-  
rent drawn by two Hall-effect sensors, filters the sensed  
current level, and outputs the corresponding logic level.  
o Provides Supply Current and Interfaces to Two  
2-Wire Hall Sensors  
o Error Output with Diagnostics of Hall Inputs and  
The MAX9921 includes input diagnostics and fault pro-  
tection. These features allow the device to determine fault  
conditions such as open inputs, inputs shorted to the bat-  
tery, and inputs shorted to ground. If the MAX9921  
detects any of these conditions at either IN1 or IN2, the  
device shuts off the current to the corresponding input.  
BAT Voltage  
o Protects Hall Sensors from Overvoltage by  
Isolating Them from Supply Transients  
o Hall Inputs Protected from Short to Ground  
o Ramps Current to Hall Sensors at 4mA/µs  
The MAX9921 protects the Hall sensors from supply tran-  
sients up to 60V at the BAT supply. Normal operating  
supply voltage ranges from 6V to 18V. If the battery volt-  
age is out of range, the MAX9921 shuts off the current to  
the Hall sensors.  
o Output Enable Input Allows Multiplexing of  
Outputs from Multiple MAX9921s  
o Hall Output Filtering  
o Hall Sensor Blanking Following Hall Sensor  
Power-Up or Restart  
The MAX9921 provides an 80µs blanking time following  
Hall sensor power-up or restart. The open-drain logic  
outputs are compatible with logic levels up to 5.5V.  
o Low-Power Shutdown, Controlled with OE and  
DIAG Inputs  
o Operates with 2V Ground Shifts Between Hall  
®
The MAX9921 is available in a small 10-pin µMAX  
Sensor and MAX9921  
package and is specified over the -40°C to +125°C  
automotive temperature range.  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +125°C  
-40°C to +125°C  
PIN-PACKAGE  
10 µMAX  
Applications  
Powered Lift Gate  
Controllers  
MAX9921AUB+T  
MAX9921AUB/V+T  
Door Modules  
Window Lifters  
Seat Movers  
10 µMAX  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
/V denotes an automotive qualified part.  
Powered Running Boards  
Seatbelt Buckles  
Electric Sunroofs  
Pin Configuration appears at end of data sheet.  
Typical Application Circuit  
V
: 6V TO 18V OPERATING,  
BAT  
0.1μF  
3.3V TO 5V  
R
ISET  
= 63.4kΩ, 1%  
WITHSTANDS 60V  
BAT  
BATTERY  
ISET  
10kΩ  
E
C
U
REF  
GENERATION,  
DIAGNOSTICS  
AND  
OVERVOLTAGE  
DETECT  
V
CC  
N
S
OE  
CONTROL  
C
O
N
N
E
ERR  
0.01μF  
μP/LOGIC  
CIRCUIT  
REMOTE  
GROUND  
DIAG  
OUT1  
IN1  
C
T
FILTER  
0.01μF  
N
O
R
IN2  
MAX9921  
OUT2  
S
FILTER  
GND  
GND  
REMOTE  
GROUND  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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