MAX9921AUB/VT Ver la hoja de datos (PDF) - Maxim Integrated

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MAX9921AUB/VT

Dual, 2-Wire Hall-Effect Sensor Interface with Diagnostics

Maxim Integrated 

Dual, 2-Wire Hall-Effect Sensor Interface

with Diagnostics

Pin Description

PIN NAME

FUNCTION

1

BAT

Battery Power Supply. Connect BAT to the positive supply through an external reverse-polarity diode. Bypass BAT

to ground with a 0.1µF capacitor.

Current-Setting Input. Connect a 63.4kΩ, 1% resistor (RISET) between BAT and ISET to set the standard current

2 ISET thresholds for Hall current sensing. Make no other connections to ISET. All routing must have low parasitic

capacitance.

3

IN1

Hall-Effect Sensor Input 1. Bypass IN1 to BAT or GND with a 0.01µF capacitor. Terminate an unused input with a

1.5kΩ resistor from IN1 to GND to prevent false error diagnostics.

4

IN2 Hall-Effect Sensor Input 2. Bypass IN2 to BAT or GND with a 0.01µF capacitor. Terminate an unused input with a

1.5kΩ resistor from IN2 to GND to prevent false error diagnostics.

5 GND Ground

6

OUT2

Open-Drain Output Signal 2. OUT2 is the signal translated from Hall Sensor 2. Connect a 10kΩ or larger pullup

resistor to logic supply.

7 OUT1 Open-Drain Output Signal 1. OUT1 is the signal translated from Hall Sensor 1. Connect a 10kΩ or larger pullup

resistor to logic supply.

Open-Drain Diagnostic and Error Output. Connect a 10kΩ or larger pullup resistor to logic supply. If DIAG is

8

ERR

asserted low, a high on ERR indicates that there is no fault while a low on ERR indicates that either the battery

voltage is out of range or there is a fault condition. If DIAG is high, ERR provides diagnostic information in

conjunction with OUT1 and OUT2. See Tables 1 and 2. If OE is low or while in shutdown, ERR is high impedance.

Output Enable Input. OE has an internal 80kΩ resistor to GND. Drive OE high to enable the outputs ERR, OUT1,

9

OE

and OUT2. Drive OE low to place the outputs in high impedance. If OE and DIAG are both low for more than 40µs,

the device enters shutdown and all outputs are in high impedance. While in shutdown, if either OE or DIAG

transitions low to high, the device exits shutdown mode.

Diagnostic Enable Input. DIAG has an internal 80kΩ resistor to GND. Drive DIAG low for normal operation. In this

mode, ERR, OUT1, and OUT2 provide Hall sensor information. Drive DIAG high for diagnostic operation. A high-to-

10 DIAG low transition initiates an attempt to restart, with a blanking cycle any Hall input that has been shut down. See

Tables 1 and 2 (diagnostic truth tables). If OE and DIAG are both low for more than 40µs, the device enters

shutdown mode with all outputs in high impedance. While in the shutdown mode, if either OE or DIAG transitions

low to high, the device exits shutdown mode.

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