DB62 Cirrus Logic Inc, DB62 Datasheet

DB62

Manufacturer Part Number

DB62

Description

DEMO BOARD FOR SA305EX

Manufacturer

Cirrus Logic Inc

Series

Apex Precision Power™r

Datasheet

1.DB62.pdf (6 pages)

Specifications of DB62

Main Purpose

Power Management, Motor Control

Embedded

Utilized Ic / Part

SA305EX

Primary Attributes

3-Ph Brushless DC (BLDC) Motors

Secondary Attributes

PWM Inputs

Processor To Be Evaluated

PIC18F2331

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Other names

598-1394

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M I C R O T E C H N O L O G Y

INTRODUCTION

the SA305 as a 3 phase brushless DC motor driver IC. The

PWM inputs to the SA305 are controlled by an on-board

microcontroller. The EVAL49 board is pre-wired for all required

and recommended external components. Please refer to ap-

plications note 32 in the Apex catalog for guidance in filter

component selection. The 1µF ceramic capacitors supplied with

the kit are for high frequency bypassing of the VS and VDD

supplies (C1, C11, C4 and C7 on the EVAL49 schematic). Two

additional 100uF bypass capacitors are provided with the kit

for the VS supplies (C2 and C12 on the EVAL49 schematic).

Please refer to applications note 30 for help with power supply

bypassing and other useful information.

PWM CONTROL IN DB62

rotor position. The stator windings are energized in a sequence

based upon the combination of three Hall sensor signals which

provide the rotor position. In the DB62 the SA305 input PWM

control is achieved by means of by an on-board Microchip®

PIC 18F2331 microcontroller. The sequence table for com-

mutation (obtained from the motor data sheet) is entered in

Table 1. Commutation Table.

The algorithm for the microcontroller is shown in figure 1. The program for Microchip® PIC 18F2331 is available for download

on www.apexmicrotech.com.

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

The DB62 is designed to demonstrate the capabilities of

BLDC motors are electronically commutated based on the

HALLA

Sensor Output

HALLB

CCW Rotation Facing Lead End

CW Rotation Lead End

HALLC

ØC (OUTC)

the program memory of the microcontroller. Hall sensors A, B

and C are connected to the IC pins of the Input Capture (IC)

module in the PIC18F2331. This module interrupts on every

transition on any of the IC pins. Upon interrupt, the interrupt

service routine reads all the three inputs and loads the correct

sequence for commutation. The following PWM control features

are programmed in the MCU provided with the DB62:

1. User Controlled PWM frequency using external potentiom-

2. User Controlled PWM duty cycle using external potenti-

direction of the motor. Depending upon the direction, the cor-

responding hall sensor commutation sequence is used and the

PWM signals are generated accordingly. The START/STOP

button can be used to run or stop the motor.

programmed for all of the features described above. The hall

sensor commutation table that has been used in programming

the MCU is shown in table 1.

DB62

The Forward/Reverse button is provided to control the

As mentioned earlier, the MCU provided with the kit is pre-

eter (VFREQ in EVAL 49 board). The PWM frequency can

be varied from 4 KHz to 118 KHz.

ometer (VDUC in EVAL49 board). The voltage set by the

potentiometer will act as a ‘Speed Reference’. The duty

cycle can be varied from 0 % to 98 %.

Driver Output

ØB (OUTB)

ØA (OUTA)

Related parts for DB62

DB62 Summary of contents

Page 1

... The stator windings are energized in a sequence based upon the combination of three Hall sensor signals which provide the rotor position. In the DB62 the SA305 input PWM control is achieved by means on-board Microchip® PIC 18F2331 microcontroller. The sequence table for com- ...

Page 2

... DB62 Figure 1: Algorithm for Microchip® PIC 18F2331 MCU as implemented for DB62. APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 2 EVALUATION KIT FOR SA305EX ...

Page 3

... D1-D6 (2 for each output provided with DB62) are recommended for use as external flyback diodes because of superior reverse recovery characteristics. Please note that in the DB62, jumpers are needed in order to con- nect the external schottky diodes (see EVAL49 layout). b) External RC snubber circuits (R13 and C5, R16 and C8, R19 and C10 in EVAL49 schematic) can provide noise immunity especially in high load current scenarios ...

Page 4

... The SA305 requires an external reset pulse at the disable pin to resume normal operation when the part latched fault condition because of Short-circuit, Over Temperature (>160°C) or Over-Current (>10 A). In the DB62 board, there is a provision to reset the part automatically without human intervention. A jumper needs to be connected between J1A and P11 of MCU as shown in the schematic ...

Page 5

... EVALUATION KIT FOR SA305EX EVAL49 SCHEMATIC APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com DB62 5 ...

Page 6

... APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. 6 DB62U REV B OCTOBER 2006 © 2006 Apex Microtechnology Corp.. EVALUATION KIT FOR SA305EX ...

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