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Power Supply, Reference, and Gain Options

2.1

Default Jumper Settings

Table 1 provides descriptions of the jumpers on the EVM and their function:

Table 1. Jumper Descriptions

Jumper

Default State

Description

GSEL1

Open

Gain select options, selects the gain of the Hall amplifier

GSEL2

Open

Gain select options, selects the gain of the Hall amplifier

REFSEL1

Open

Reference select options, selects the reference mode

REFSEL2

Open

Reference select options, selects the reference mode

2.2

Available Test Points

Table 2 provides descriptions of the test points on the EVM and their functions:

Table 2. Test Point (TP) Descriptions

TP Name

Description

VCC

EVM power, monitor with respect to GND test point

GND

System ground, there are 5 GND test points for ease of monitoring

IAIN1

Inverting input of the differential amplifier

IAIN2

Non-inverting input of the differential amplifier

ERROR

Error flag output (open drain output with 10-k

Ω pull-up)

OR

Over Range Indicator (open drain output with 10-k

Ω pull-up)

VOUT

Output of the differential amplifier

REFIN

Input for zero reference to differential amplifier

Other

There are four additional test points for use in monitoring the state of the reference select

pins as well as the gain select pins

3

Power Supply, Reference, and Gain Options

The EVM requires a single power supply in the range of +2.7-V to +5.5-V DC, for proper operation of the

device. The EVM (without a Hall sensor installed) draws less than 10 mA at 5.5 V.

Power can be applied to the EVM via the banana jacks labeled VCC and GND, or through clip leads

directly to the VCC and GND test points. When operating the EVM, TI recommends to use a linear DC

bench supply, current limited to 50 mA.

3.1

Reference Voltage Selection

The EVM provides two jumpers to configure the reference voltage output selection. The reference

selection input pins are pulled to ground, or logic ‘0’ by default (jumpers ‘open’). Closing the jumpers

places the associated REFSEL pin at the applied Vcc potential (logic ‘1’). Table 3 provides a description of

the available options:

Table 3. Voltage Selection Options

Mode

REFSEL1

REFSEL2

Description

REF = 2.5 V

Open

Open

Used with Hall-sensor supply of 5 V

REF = 1.65 V

Closed

Open

Used with Hall-sensor supply of 3.3 V

Ratiometric Output

Closed

Closed

Provides a reference output centered on VCC/2

3

SLVU772A – August 2013 – Revised November 2013

DRV411EVM User's Guide

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