MCT8316AT datasheet(23/179 Pages) TI

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8.3.2.2 I2C Interface

The MCT8316AV supports an I2C serial communication interface that allows an external controller to send and

receive data. This I2C interface lets the external controller configure the EEPROM and read detailed fault and

motor state information. The I2C bus is a two-wire interface using the SCL and SDA pins which are described as

follows:

• The SCL pin is the clock signal input.

• The SDA pin is the data input and output.

8.3.2.3 Hardware Interface - Pin Configuration

MCT8316AT allows configuration of motor control algorithm and driver parameters through the pull-down

resistors connected to the device configuration pins, RMP_1, RMP_2, LDANGLE, CONFIG_1, ILIMIT,

SLEW_RATE, CONFIG_2 and CONFIG_3. This allows quick and easy configuration of the MCT8316 motor

control and gate driver parameters without the need for EEPROM programming through I2C interface. The

parameters that can be configured by each device configuration pin are detailed inTable 8-1 .

Table 8-1. Pin configurable parameters

Configurable Parameters

RMP_1, RMP_2

Start-up method, open loop acceleration rate, closed loop

acceleration rate, first cycle frequency, align time, dynamic degauss

enable, fast start-up enable, stationary brake time, auto handoff

enable, handoff threshold, open loop duty, align ramp rate

LDANGLE

Lead angle or BEMF threshold

CONFIG_1

PWM switching frequency, ZC detection blanking time, IPD clock

frequency

ILIMIT, SLEW_RATE

CBC limit, open loop, align and IPD current limit, buck output voltage

selection, phase output voltage slew rate

CONFIG_2

OCP level, OCP mode, AAR enable, delay compensation enable

CONFIG_3

Abnormal speed, minimum duty

RMP_1 and RMP_2 pins are used to set the start-up method (Double Align or IPD), open loop acceleration

rate A1 (OL_ACC_A1 in Hz/s), closed loop acceleration rate (CL_ACC in V/s), startup brake time

(STARTUP_BRK_TIME in ms), first cycle frequency (SLOW_FIRST_CYCLE_FREQ in Hz) and align time

(ALIGN_TIME in ms, if Double Align is selected).

RMP_1 is used to set the start-up method and the inertia profile of the motor-load system. Inertia profiles

range from ultra-high inertia (like ceiling fans) to ultra-high acceleration (like fuel pumps) with some example

applications for each type of inertia profile given in Table 8-2. Once the inertia profile is chosen using

RMP_1 pin, RMP_2 pin is used to set parameters like CL_ACC, OL_ACC_A1, STARTUP_BRK_TIME,

SLOW_FIRST_CYC_FREQ, ALIGN_TIME (if applicable).

Based on the inertia profile and CL_ACC chosen, other parameters including IPD repeat times (IPD_REPEAT),

dynamic degauss enable (DYN_DEGAUSS_EN), auto handoff enable (AUTO_HANDOFF), handoff threshold

(OPN_CL_HANDOFF_THR), OL duty (OL_DUTY), align ramp rate (ALIGN_RAMP_RATE) and fast start-up

enable (INTEG_ZC_METHOD) are auto-selected as per Tables through 12-11. Note that Open loop acceleration

rate A2 (OL_ACC_A2 in Hz/s2) is set to the same value as that of OL_ACC_A1.

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MCT8316A

SLLSFH8A – AUGUST 2021 – REVISED DECEMBER 2021

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