Texas Instruments DRV10964 Manuale utente

SLAU675–February 2016

DRV10964 Evaluation Module

User's Guide

SLAU675–February 2016

DRV10964 Evaluation Module

This document is provided with the DRV10964 customer evaluation module (EVM) as a supplement to the

DRV10964 datasheet (SLDS227). It details the hardware implementation of the EVM and gives a step-by-

step introduction to the device operation.

Contents

1 DRV10964 EVM Kit Contents.............................................................................................. 2

2 Introduction ................................................................................................................... 2

3 DRV10964 On-Board Connections........................................................................................ 3

3.1 Power Input.......................................................................................................... 3

3.2 Interface Connectors (J4) for Phases of Motor ................................................................. 3

3.3 TLC555 Pins......................................................................................................... 3

4 DRV10964 Package......................................................................................................... 4

5 User Interface ............................................................................................................... 5

5.1 Jumpers.............................................................................................................. 5

5.2 PWM Configuration With the TLC555 Timer.................................................................... 5

5.3 Test Points........................................................................................................... 6

6 Powering-Up the EVM ...................................................................................................... 6

7 Tune Open to Close Loop Handoff Threshold .......................................................................... 7

8 EVM Documentation ...................................................................................................... 10

DRV10964 EVM Kit Contents

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1 DRV10964 EVM Kit Contents

The DRV10964 evaluation kit contains the DRV10964 EVM.

2 Introduction

The DRV10964 EVM is an evaluation platform for the DRV10964 three-phase brushless DC motor driver.

The EVM includes a TLC555 timer configured to supply a PWM to the DRV10964 and potentiometer to

adjust the speed of the motor by varying the duty cycle of the PWM.

This document describes the kit details and explains the functions and locations of test points, jumpers,

and connectors present on the kit. For detailed information about the DRV10964, refer to the DRV10964

data sheet (SLDS227).

Figure 1. DRV10964 EVM

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DRV10964 On-Board Connections

SLAU675–February 2016

DRV10964 Evaluation Module

3 DRV10964 On-Board Connections

3.1 Power Input

The DRV10964 requires an external power supply (2.1 V to 5.5 V) to operate. Connector J1 provides the

required interface for the external power supply. The pin assignment of terminal P1 is as follows:

Table 1. DRV10964

Pin Description

1 VCC

2 GND

3.2 Interface Connectors (J4) for Phases of Motor

Connector J4 is used to interface the U, V, and W phases. The pin assignments are as follows:

Table 2. Connector P2: 3-Terminal Connector to

Connect 3-Phase BLDC Motor

Pin Description

1 Phase-W

2 Phase-V

3 Phase-U

3.3 TLC555 Pins

Table 3 lists the TLB555 pin descriptions.

Table 3. TLC555 Pins

Pin Description

1 GND

2 TRIG

3 OUT

4 RESET

5 CONT

6 THRES

7 DISCH

8 VCC

DRV10964 Package

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4 DRV10964 Package

The DRV10964 pin-out is listed in Table 4.

Table 4. DRV10964 Pin-Out

Pin Description

1 FG

2 FG_STATUS

3 VCC

4 W

5 GND

6 V

7 U

8 FR

9 CONFIG

10 PWM

The DRV10964 is packaged in a 10-pin USON package. For detailed information about the DRV10964,

refer to the DRV10964 data sheet (SLDS227).

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User Interface

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DRV10964 Evaluation Module

5 User Interface

5.1 Jumpers

Descriptions for the jumpers are provided in the following list:

•FR: Motor direction selector. Upon start-up, the DRV10964 device spins the motor in the direction

indicated by the FR input pin. The direction of commutation is as described in the following table.

Connection Direction Description

VCC – FR U →W→V

GND – FR U →W→V

•CMTMOD: The FGS pin is used to configure the output of the FG pin. Based on the configuration of

the FGS pin and the frequency of FG (FG_FREQ), the motor speed is calculated as shown in the

following table.

Connection Description

VCC – FR RPM = (FG_FREQ × 60 ×3) / Number of pole pairs

GND – FGS RPM = (FG_FREQ × 60) / Number of pole pairs

5.2 PWM Configuration With the TLC555 Timer

The PWM signal is generated with circuitry based on TI’s TLC555 low-power timer. PWM is generated

based on input from the potentiometer. The PWM signal generated by the circuitry on the EVM is

approximately 25 kHz and is adjustable from 5% to 95% duty cycle using the potentiometer (R5). External

PWM input can be applied to test point PWMIN by removing resistor R6.

Figure 2. PWM Configuration for DRV10964 EVM

User Interface

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The potentiometer adjusts the duty cycle of the PWM signal, which in turn adjusts the speed of the motor.

A lower duty cycle gives a lower speed and a higher duty cycle provides a higher speed. Turning the

potentiometer counterclockwise lowers the speed, and turning it clockwise increases the speed.

For more information on the PWM input required by the DRV10964, refer to the datasheet (SLDS227).

5.3 Test Points

Test points are provided and labeled according to the inputs and outputs of the DRV10964 motor driver

(see Table 5).

Table 5. Test Point Descriptions

Test Points Description Test Points Description

TP 1 PWMIN TP 5 Motor V phase

TP 2 GND TP 6 VCC

TP 3 CONFIG TP 7 FG

TP 4 Motor U phase TP 8 Motor W phase

CAUTION

Do not apply power to the board before you have read Section 6!

6 Powering-Up the EVM

The DRV10964 EVM requires a VM power supply source, which has a recommended operating range

from 2.1 to 5.5 V. Use the following sequence to power-up the EVM:

1. Connect the power supply Ground to pin 1 (GND) and a voltage between 2.1 to 5.5 V to pin 2 of

connector P1 (VM). Set the current limit on the power supply to 1 A and make sure switch S1 is in the

OFF position.

2. Turn the POT-R5 fully CCW (counterclockwise). This keeps the speed PWM input to the minimum

value.

3. Connect the 3-phase terminal of the motor to connector J4 or U-V-W test points.

4. Power up the board by turning the power supply on.

5. Rotate the potentiometer to different positions to change the speed of motor.

Turn R5 CCW

DRV10964

Motor Phase

Connector

Power Supply

Input

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Tune Open to Close Loop Handoff Threshold

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DRV10964 Evaluation Module

Figure 3. DRV10964 EVM With Various Connections and User Interface

7 Tune Open to Close Loop Handoff Threshold

The DRV10964 has the option of changing open to close loop handoff threshold by configuring the

CONFIG pin. If there is an issue with the motor starting up, TI recommends changing the open to close

loop handoff threshold. Different levels of open to close loop threshold can be set based on the voltage

applied (percentage of supply voltage) on the CONFIG pin. The open to close loop handoff can be

changed either by changing the voltage on the CONFIG testpoint or by changing biasing resistors R2 and

R3. Table 6 shows the available options for open to close threshold and associated configuration.

(1) Resistor value is based on 1% tolerance. Resistor value is only recommended based on the % in the first column. Any

resistance divider value can be selected as long as the ratio meets requirements.

Table 6. CONFIG Pin Configurations for Open to Close Loop Handoff Threshold

Config Pin (% VCC)

Ratio of (R3/R2) Open to Close Handoff

Threshold (Hz) Config Pin Voltage

for VCC = 5 V Suggested Resistance

Value(1)

R3 (kΩ) R2 (kΩ)

3.14 78 0.16 5 160

9.4 12.5 0.47 10 105

15.6 25 0.78 15 95.3

21.8 37.5 1.09 20 91

28.1 50 1.41 25 88.7

34.4 62.5 1.72 30 88.7

40.6 75 2.03 35 86.6

46.8 87.5 2.34 40 84.5

53.1 100 2.66 45 84.5

Tune Open to Close Loop Handoff Threshold

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Table 6. CONFIG Pin Configurations for Open to Close Loop Handoff Threshold (continued)

Config Pin (% VCC)

Ratio of (R3/R2) Open to Close Handoff

Threshold (Hz) Config Pin Voltage

for VCC = 5 V Suggested Resistance

Value(1)

R3 (kΩ) R2 (kΩ)

59.3 112.5 2.97 50 84.5

65.6 125 3.28 55 84.5

71.9 137.5 3.60 60 84.5

78.1 150 3.91 65 82.5

84.4 162.5 4.22 70 82.5

90.6 175 4.53 75 82.5

96.9 187.5 4.85 80 82.5

The selection of handoff threshold can be determined by experimental testing. The goal is to choose a

handoff threshold that is as low as possible and allows the motor to smoothly and reliably transition

between the open loop acceleration and the closed loop acceleration. Normally higher speed motors

(maximum speed) require a higher handoff threshold because higher speed motors have lower Kt, and as

a result, lower BEMF. Table 7 shows the configurable settings for the handoff threshold. Maximum speeds

in electrical Hz are shown as a guide to assist in identifying the appropriate handoff speed for a particular

application.

Table 7. Recommend Handoff Threshold Based on Maximum Speed of Operation

Maximum Speed (Hz) Handoff Frequency (Hz) Maximum Speed (Hz) Handoff Frequency (Hz)

< 100 12.5 450 to ≈500 112.5

100 to ≈150 25 500 to ≈560 125

150 to ≈200 37.5 560 to ≈620 137.5

200 to ≈250 50 620 to ≈700 150

250 to ≈300 62.5 700 to ≈800 162.5

300 to ≈350 75 800 to ≈900 175

350 to ≈400 87.5 > 900 187.5

400 to ≈450 100

Figure 4 shows the phase current for the case where the open to close loop handoff threshold is set to a

higher value than required. So in such cases, TI recommends reducing the open to close loop handoff

threshold. Figure 5 shows the phase current for the case where the open to close loop handoff threshold

is low; it is possible that the motor will fail to start. In such cases, it is recommended to increase the open

to close loop handoff threshold. Figure 6 shows the phase current for properly tuned open to close loop

handoff threshold.

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Tune Open to Close Loop Handoff Threshold

SLAU675–February 2016

DRV10964 Evaluation Module

Figure 4. Phase Current for High Open to Close Loop Handoff Threshold

Figure 5. Phase Current for Low Open to Close Loop Handoff Threshold

EVM Documentation

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Figure 6. Phase Current for Properly Tuned Open to Close Loop Handoff Threshold

8 EVM Documentation

The EVM schematics, layout, and bill of materials (BOM) are provided in the hardware file (SLVXXX).

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