MAX9921 Maxim Integrated Products, MAX9921 Datasheet
MAX9921
Manufacturer Part Number
MAX9921
Description
2-Wire Hall-Effect Sensor Interface
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX9921.pdf
(15 pages)
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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.
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.
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.
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.
The MAX9921 is available in a small 10-pin µMAX
package and is specified over the -40°C to +125°C
automotive temperature range.
19-4119; Rev 0; 6/08
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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.
Door Modules
Window Lifters
Seat Movers
Electric Sunroofs
GROUND
GROUND
REMOTE
REMOTE
N
N
S
S
V
WITHSTANDS 60V
BAT
Dual, 2-Wire Hall-Effect Sensor Interface
________________________________________________________________ Maxim Integrated Products
BATTERY
: 6V TO 18V OPERATING,
General Description
C
U
C
O
N
N
C
O
E
E
T
R
Powered Lift Gate
Controllers
Powered Running Boards
Seatbelt Buckles
0.01μF
Applications
0.01μF
ISET
IN1
IN2
R
ISET
= 63.4kΩ, 1%
®
OVERVOLTAGE
DIAGNOSTICS
GENERATION,
BAT
DETECT
AND
REF
GND
♦ Withstands 60V at BAT Supply and Hall Inputs
♦ 6V to 18V Operating Voltage Range
♦ Provides Supply Current and Interfaces to Two
♦ Error Output with Diagnostics of Hall Inputs and
♦ Protects Hall Sensors from Overvoltage by
♦ Hall Inputs Protected from Short to Ground
♦ Ramps Current to Hall Sensors at 4mA/µs
♦ Output Enable Input Allows Multiplexing of
♦ Hall Output Filtering
♦ Hall Sensor Blanking Following Hall Sensor
♦ Low-Power Shutdown, Controlled with OE and
♦ Operates with ±2V Ground Shifts Between Hall
+ Denotes a lead-free package.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
MAX9921AUB+T
FILTER
FILTER
0.1μF
2-Wire Hall Sensors
BAT Voltage
Isolating them from Supply Transients
Outputs from Multiple MAX9921s
Power-Up and Restart
DIAG Inputs
Sensor and MAX9921
PART
CONTROL
MAX9921
Typical Application Circuit
with Diagnostics
-40°C to +125°C
OE
ERR
DIAG
OUT1
OUT2
TEMP RANGE
Ordering Information
3.3V TO 5V
10kΩ
μP/LOGIC
CIRCUIT
PIN-PACKAGE
10 µMAX
GND
V
Features
CC
1
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