DRV10983ZPWPR datasheet(16/58 Pages) TI1

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DRV10983

SLVSCP6C – JULY 2014 – REVISED MAY 2016

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Feature Description (continued)

Table 1. Conditions to Enter or Exit Sleep or Standby Condition (continued)

Speed

Command

Mode

Enter Sleep/Standby Condition

Exit from Standby Condition

Exit from Sleep Condition

I2C

SpdCtrl[8:0] is programmed as 0 for

TEN_SL_SB

SpdCtrl[8:0] is programmed as non-zero

for TEX_SL_SB

SPEED pin high ( V > VDIG_IH) for

TEX_SL_SB

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.

9.3.5 Non-Volatile Memory

DRV10983 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 ‘10110110’ (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.

9.4 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.

9.4.1 Motor Parameters

Refer to the DRV10975/83 Tuning Guide for the motor parameter measurement.

The motor resistance and motor velocity constant are two important parameters used to characterize a BLDC

motor. The DRV10983 requires these parameters to be configured in the register. The motor resistance is

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

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

9.4.1.1 Motor Resistance

The motor resistance (RPH_CT) must be converted to a 7-bit digital register value Rm[6:0] to program the motor

resistance value. The digital register value can be determined as follows:

1. Convert the motor resistance (RPH_CT) to a digital value where the LSB is weighted to represent 9.67 mΩ:

Rmdig = RPH_CT / 0.00967.

2. Encode the digital value such that Rmdig = Rm[3:0] << Rm[6:4].

The maximum resistor value, RPH_CT, that can be programmed for the DRV10983 is 18.5 Ω, which represents

Rmdig = 1920 and an encoded Rm[6:0] value of 0x7Fh. The minimum resistor the DRV10983 supports is 0.029

Ω, RPH_CT, which represents Rmdig = 3.

For convenience, the encoded value for Rm[6:0] can also be obtained from Table 2.

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