MAX9921 19-4119 Rev 1 1/10 Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics General Description Features Withstands 60V at BAT Supply and Hall Inputs The MAX9921 provides a single chip solution to interface two 2-wire Hall-effect sensors to a low-voltage micro- 6V to 18V Operating Voltage Range processor (P). This device supplies and monitors the cur- Provides Supply Current and Interfaces to Two rent drawn by two Hall-effect sensors, filters the sensed 2-Wire Hall Sensors current level, and outputs the corresponding logic level. Error Output with Diagnostics of Hall Inputs and The MAX9921 includes input diagnostics and fault pro- BAT Voltage tection. These features allow the device to determine fault Protects Hall Sensors from Overvoltage by conditions such as open inputs, inputs shorted to the bat- Isolating Them from Supply Transients tery, and inputs shorted to ground. If the MAX9921 Hall Inputs Protected from Short to Ground detects any of these conditions at either IN1 or IN2, the device shuts off the current to the corresponding input. Ramps Current to Hall Sensors at 4mA/s The MAX9921 protects the Hall sensors from supply tran- Output Enable Input Allows Multiplexing of sients up to 60V at the BAT supply. Normal operating Outputs from Multiple MAX9921s supply voltage ranges from 6V to 18V. If the battery volt- Hall Output Filtering age is out of range, the MAX9921 shuts off the current to Hall Sensor Blanking Following Hall Sensor the Hall sensors. Power-Up or Restart The MAX9921 provides an 80s blanking time following Low-Power Shutdown, Controlled with OE and Hall sensor power-up or restart. The open-drain logic DIAG Inputs outputs are compatible with logic levels up to 5.5V. Operates with 2V Ground Shifts Between Hall The MAX9921 is available in a small 10-pin MAX Sensor and MAX9921 package and is specified over the -40C to +125C Ordering Information automotive temperature range. PART TEMP RANGE PIN-PACKAGE Applications MAX9921AUB+T -40C to +125C 10 MAX Door Modules Powered Lift Gate MAX9921AUB/V+T -40C to +125C 10 MAX Controllers Window Lifters +Denotes a lead(Pb)-free/RoHS-compliant package. Powered Running Boards Seat Movers T = Tape and reel. Seatbelt Buckles /V denotes an automotive qualified part. Electric Sunroofs Pin Configuration appears at end of data sheet. Typical Application Circuit V : 6V TO 18V OPERATING, BAT 0.1F 3.3V TO 5V R = 63.4k, 1% ISET WITHSTANDS 60V BAT BATTERY ISET 10k E REF C GENERATION, U V CC N DIAGNOSTICS OE CONTROL AND C OVERVOLTAGE S ERR O DETECT N 0.01F P/LOGIC REMOTE N DIAG CIRCUIT IN1 GROUND E OUT1 C FILTER T 0.01F N O IN2 MAX9921 R OUT2 S FILTER GND GND REMOTE GROUND MAX 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 Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEDual, 2-Wire Hall-Effect Sensor Interface with Diagnostics ABSOLUTE MAXIMUM RATINGS BAT to GND............................................................-0.3V to +60V Current into IN1, IN2.......................................................100mA ISET to BAT ...........................................................-2.0V to +0.3V Continuous Power Dissipation (T = +70C) A IN1, IN2 to GND..........-5.0V to the lower of +60V or (V + 1V) 10-Pin MAX (derate 5.6mW/C above +70C) .........444.4mW BAT DIAG, OE to GND..................................................-0.3V to +6.0V Operating Temperature Range .........................-40C to +125C OUT1, OUT2, ERR to GND....................................-0.3V to +6.0V Junction Temperature......................................................+150C Short-Circuit Duration of OUT1, OUT2, ERR to GND Storage Temperature Range .............................-65C to +150C or to 5.5V (individually)............................................Continuous Lead Temperature (soldering, 10s) .................................+300C Current into Any Pin Except IN1, IN2 ...............................20mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (V = 13.6V, V = 0, V = 5V, IN1 = IN2 = no connection, R = 63.4k, R = 10k at ERR, OUT1 and OUT2, T = -40C BAT DIAG OE ISET PU A to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL BAT Supply Range V 618V BAT V Low for ERR Output Active V 5.2 V BAT BL V High for ERR Output Active V 22 V BAT BH I Normal mode 1 1.3 mA BAT BAT Supply Current I Shutdown mode, V = V = 0V 1 A SD OE DIAG HALL INPUTS (IN1 and IN2) R = 63.4k -11.5 ISET Input Current for Output High I mA IH R = 59.0k -12.4 ISET R = 63.4k -7.2 ISET Input Current for Output Low I mA IL R = 59.0k -7.8 ISET R = 63.4k 0.76 ISET Input Current Hysteresis for I mA IN,HYS High/Low Detection R = 59.0k 0.78 ISET V = 6V, inputs IN1, IN2 with BAT Input Pullup Impedance R 50 PU I = -14mA IN Input Voltage Interpreted as V Measured with respect to V 100 mV SB BAT Shorted to Battery Current Range Interpreted as I -2 +0.02 mA OC Open Circuit Not a sustained R = 63.4k -23 ISET Current Level Interpreted as I condition, reverts to - mA SC Shorted Sensor to Ground R = 59.0k -25 ISET 50A when detected 2 MAX9921