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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-kΩ pull-up)

OR Over Range Indicator (open drain output with 10-kΩ 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

SLVU772A–August 2013–Revised November 2013 DRV411EVM User's Guide

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