DRV10975ZPWPR datasheet(17/65 Pages) TI1

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DRV10975, DRV10975Z

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SLVSCP2E – JANUARY 2015 – REVISED MAY 2018

Product Folder Links: DRV10975

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Feature Description (continued)

For different speed command modes, Table 1 shows the timing and command to enter the sleep or standby

condition.

Table 1. Conditions to Enter or Exit Sleep or Standby Condition

SPEED COMMAND

MODE

ENTER STANDBY

CONDITION

ENTER SLEEP

CONDITION

EXIT FROM STANDBY

CONDITION

EXIT FROM SLEEP

CONDITION

Analog

SPEED pin voltage < VEN_SB

for tEN_SB_ANA

SPEED pin voltage <

VEN_SL for tEN_SL_ANA

SPEED pin voltage > VEX_SB

for tEX_ SB_ANA

SPEED pin voltage > VEX_SL

for tEX_ SL_ANA

PWM

SPEED pin low (V < VDIG_IL)

for tEN_SB_PWM

SPEED pin low (V <

VDIG_IL) for

tEN_SL_PWM

SPEED pin high (V >

VDIG_IH) for tEX_SB_PWM

SPEED pin high (V >

VDIG_IH) for tEX_SL_PWM

I2C

SpdCtrl[8:0] is programmed

as 0 for tEN_SB_PWM

SpdCtrl[8:0] is

programmed as 0 for

tEN_SL_PWM

SpdCtrl[8:0] is programmed

as non-zero for tEX_SB_PWM

SPEED pin high (V >

VDIG_IH) for tEX_SL_PWM(PWM

mode) or SPEED pin voltage

> VEX_SL for tEX_ SL_ANA

(Analog mode)

Note that using the analog speed command, a higher voltage is required to exit from the sleep condition than the

standby condition. The I2C speed command cannot take the device out of the sleep condition because I2C

communication is disabled during the sleep condition.

8.3.5 Non-Volatile Memory

The DRV10975 has 96-bits of EEPROM data, which are used to program the motor parameters as described in

the I2C Serial Interface.

The procedure for programming the EEPROM is as follows. TI recommends to perform the EEPROM

programming without the motor spinning, power cycle after the EEPROM write, and read back the EEPROM to

verify the programming is successful.

1. Set SIdata = 1.

2. Write the desired motor parameters into the corresponding registers (address 0x20:0x2B) (see I2C Serial

Interface).

3. Write 1011 0110 (0xB6) to enProgKey in the DevCtrl register.

4. Ensure that VCC is at or above 22 V.

5. Write eeWrite = 1 in EECtrl register to start the EEPROM programming.

The programming time is about 24 ms, and eeWrite bit is reset to 0 when programming is done.

8.4 Device Functional Modes

This section includes the logic required to be able to reliably start and drive the motor. It describes the processes

used in the logic core and provides the information needed to effectively configure the parameters to work over a

wide range of applications.

8.4.1 Motor Parameters

For the motor parameter measurement, see the DRV10983 and DRV10975 Tuning Guide.

The motor phase resistance and the BEMF constant (Kt) are two important parameters used to characterize a

BLDC motor. The DRV10975 requires these parameters to be configured in the register. The motor phase

resistance is programmed by writing the values for Rm[6:0] in the MotorParam1 register. The BEMF constant is

programmed by writing the values for Kt[6:0] in the MotorParam2 register.

8.4.1.1 Motor Phase Resistance

For a wye-connected motor, the motor phase resistance refers to the resistance from the phase output to the

center tap, RPH_CT (see Figure 8).

DRV10975ZPWPR Datasheet(PDF) 17 Page - Texas Instruments

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