SLVAF75 August   2021 DRV10987

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Sleep and Standby Mode
    2. 1.2 Conditions for Entering or Exiting Sleep
    3. 1.3 Sequence to Enter Sleep Mode
  3. 2Implementation
    1. 2.1 Hardware Setup
    2. 2.2 Power Up Sequence With Speed Pin in I2C Speed Command Mode
    3. 2.3 Implementing Option 1
    4. 2.4 Option 1 With Zero Value at Speed Register
    5. 2.5 Implementing C Code With Option 2
    6. 2.6 Implementation of Exiting From Sleep Mode
  4. 3References

2.3 Implementing Option 1

To accurately implement sleep entry using Option 1, Step3 and Step4 must be performed in which Speed ​​is a non-zero value, see Table 2-1.

In example code, Step1 and Step2 are skipped, because Step1 and Step3 are executed to run the motor at active state.

Table 2-1 Implementing C Code With Option 1
DRV10987 Data Sheet Implementation in C code
Step1 Provide a non-zero value to the speed control register. For example, write 100 to register 0x30, speedCtrl[8:0].
Step2 Set the I 2C OverRide bit to 1. That is, write 1 to register 0x30, speedCtrl[15].
Step3 In analog mode, be sure SPEED pin voltage is less than VEN_SL for tEN_SL_ANA. In PWM mode, make sure SPEED pin is low (V < VDIG_IL) for tEN_SL_PWM. 
P1OUT &= ~BIT5;//Speed pin voltage low 0V.
Step4 Provide the value of zero to the speed control register to enter sleep mode. That is, write 0 to register 0x30, speedCtrl[8:0]. 
DRV10987Q_Send(DRV10987Q_SpeedCtrl_Reg ,0x8000);// overRide 0, speed 00

When DRV10987 enters sleep mode, 1.8 and 3.3 LDO are off and SDA that is pulled up with 3.3-V LDO is low. The current measured is 66.9 µA.

GUID-20210630-CA0I-BBDZ-PZ3B-QWJ5VGH9VPKZ-low.jpg
Ch1: 24 V, Ch2: SDA, Ch3: SPEED PIN Ch4: W PHASE VOLT of Motor
Figure 2-2 Waveform of Entering Sleep Using Option 1
GUID-20210707-CA0I-PG1W-DMNT-TZVZ1TLLTHRB-low.jpgFigure 2-3 Measure of Sleep Current