MP6501A – 35V, 2.5A MICROSTEPPING MOTOR DRIVER WITH INTEGRATED FETS

MP6501A Rev. 1.11

www.MonolithicPower.com

9

8/22/2016

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PIN FUNCTIONS

Pin #

Name

Description

1

CPA

Charge Pump Capacitor. Connect a 100nF ceramic capacitor between these pins.

The capacitor needs to be rated for at least the voltage applied to VIN.

2

CPB

3

VCP

Charge Pump Output. Requires a 1uF 16V ceramic capacitor to VIN.

4,13

VIN

Input Supply Voltage. Both VIN pins must be connected to the same supply.

5

AOUT1

Bridge A Output Terminal 1.

6,7

SENA

Bridge A Sense Resistor Connector. Connect to current sensor resistor for bridge A.

8

AOUT2

Bridge A Output Terminal 2.

9

BOUT2

Bridge B Output Terminal 2.

10,11

SENB

Bridge B Sense Resistor Connector. Connect to current sensor resistor for bridge B.

12

BOUT1

Bridge B Output Terminal 1.

14

nSLEEP

Sleep Mode Input. Logic low to enter low-power sleep mode. Internal pull down.

15

VG

Low Side MOSFETs Gate Driver. Decouple with a 1uF 16V ceramic capacitor to

GND.

16

nRSET

Reset Input. Logic low initializes the translator and control logic circuit. Internal pull

down.

17

nENBL

Enable Input. Logic high to disable the bridge outputs and translator operation, logic

low to enable. Internal pull down.

18

MS3

Mode Select. See ”Microstep Select” below for details. MS1-MS3 sets the step mode

– full-, half-, quarter-, or eighth- step. Internal pull down.

19

MS2

20

MS1

21

DIR

Direction Input. Logic level sets direction of rotation. Internal pull down.

22

STEP

Step Input. Rising edge sequences the translator and advances the motor one

increment. Internal pull down.

23

nFAULT

Fault Indication. Open-drain output type, logic low when in fault condition (OCP, OTP,

OVP).

24

nHOME

Home Position. Open-drain output type, logic low when at home state of step table.

25

ROSC

Constant Off Time Setting Input. Connect a resistor to GND.

26

MDS

Mixed Decay Setting. See “Decay Modes” below for details.

27

VREF

Reference Voltage Input. Voltage applied to this pin defines the current through the

motor. Can be connected to 3P3VOUT.

28

3P3VOUT

3.3V Regulator Output. Decouple with a 0.47μF 6.3V ceramic capacitor to GND.