Dual, 2-Wire Hall-Effect Sensor Interface

with Diagnostics

8

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VBAT = 14V, TA = +25°C, unless otherwise noted.)

VBAT OVERVOLTAGE THRESHOLD

vs. TEMPERATURE

TEMPERATURE (

°C)

-40 -25 -10 5

20 35 50 65 80 95 110 125

19.5

19.6

19.7

19.8

19.9

20.0

20.1

20.2

20.3

20.4

20.5

VBAT FALLING, ERR GOES LOW

VBAT RISING, ERR GOES HIGH

INPUT PULLUP RESISTANCE

vs. VBAT

VBAT (V)

6

9

12

15

18

0

10

20

30

40

50

60

70

80

TA = +125

°C

TA = +25

°C

TA = -40

°C

THRESHOLD CURRENT vs. ISET RESISTOR

CHANGE IN ISET RESISTOR (%)

-15

-10

-5

0

5

10

15

-15

-10

-5

0

5

10

15

HYSTERESIS

INPUT CURRENT FOR OUTPUT

HIGH AND INPUT CURRENT

FOR OUTPUT LOW

RESPONSE OF INPUT TO SHORT TO GROUND

MAX9921 toc22

10

μs/div

VIN1

10V/div

IIN1

25mA/div

0V

0V

0A

VERR

5V/div

STARTUP OF HALL INPUT FROM SHUTDOWN

MAX9921 toc23

20

μs/div

10V/div

5V/div

5V/div

10mA/div

BLANKING PERIOD

VIN_

VOUT_

VOE_

IIN_