User Guide

EVAL-AD74115H

EVALUATION BOARD HARDWARE

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Rev. 0 | 5 of 24

Table 1. EVAL-AD74115H-ARDZ Jumper Functionality

Link

Function

Default Position

JP1

The AD74115H charge pump is disconnected from AVSS. If using the charge pump of the AD74115H, close JP1 to connect

the charge pump voltage to the AVSS pin. JP1 and JP8 cannot be closed at the same time.

Open

JP3

REFIN provides power to the on-board thermistor.

Closed

JP8

Connect the VOUT3 pin of the ADP1034 to the AVSS supply pin of the AD74115H. If using the charge pump of the

AD74115H, open JP8 to disconnect the external power source from AVSS. JP1 and JP8 cannot be closed at the same time.

Closed

P14

Connect the REFIN pin of the AD74115H to the ADR4525, external precision reference. To use the internal reference,

connect Pin 2 to Pin 3.

Pin 1 to Pin 2

P15

The DO_VDD pin of the AD74115H is powered by the AVDD supply (that is, powered by the ADP1034). If the external

digital output functionality is required, apply an external power supply to the DO_SUPPLY terminal. Configure P15 to

connect the DO_VDD pin of the AD74115H to the external DO_SUPPLY (Pin 1 to Pin 2).

Pin 2 to Pin 3

P17

Connect the AD74115H HART_TX_OUT signal to the HART_TX_IN signal.

Pin 1 to Pin 2

P19

The ADP1034 SLEW pin is floating. For slower slew rates, tie the SLEW pin to the VINP pin of the ADP1034 or ground.

Open

P20

The LVIN pin of the AD74115H is switched to measure the thermistor voltage.

Pin 2 to Pin 3

JP2, P6, P7, P12,

P13

Digital output connectors. By default, the digital output circuitry is configured for internal digital output functionality (for

currents up to 100 mA, continuous). Full details of the connections required for each function are included in Table 2.

Configured for an internal

digital output