Hello expert,
1. from the datasheet this PIN can be supplied by 3.3V or 5V, do you mean for SPI physical layer，both 3.3V and 5V are OK?
2.My project this PIN is supplied by 5V,could you provide the typical and maximum supply current needed from this PIN? Consider the TJ -40~150C, and different function mode and SPI clock 1M.
Hi Zhiyuan,
1. Yes that is correct, the VSDO pin can be supplied 3.3V or 5V depending on the desired logic level.
The VSDO pin must not exceed the absolute maximum ratings of:
And will operate within the supply range of:
2. The VSDO voltage should be the same voltage that is powering the MCU. If your MCU is supplied with 5V, the same 5V supply should be powering the VSDO pin.
A typical application configuration can be found in section 8 of the data sheet.
Best,
David
Hello Expect,
What do you mean very low? less than 1mA? We need to know how many current need from the 5V supplier.
Beside, about the VM supply current there is only data when Tj=25 and Vin=13.5V. Pls provide the data considering Vin up to 19V and Tj up to 150C,thank you!
Hi Zhiyuan,
What do you mean very low? less than 1mA? We need to know how many current need from the 5V supplier.
The VSDO pin sets the SDO voltage threshold and does not require a certain amperage to activate, only a voltage. Any current pulled to this pin will be regulated.
Additionally, the SPI logic voltage should be the same as the VSDO voltage.
Please see the schematic in the hardware files from the following link to view our EVM implementation of the VSDO pin.
DRV8889-Q1EVM design files:
https://www.ti.com/tool/DRV8889-Q1EVM#design-files
Beside, about the VM supply current there is only data when Tj=25 and Vin=13.5V. Pls provide the data considering Vin up to 19V and Tj up to 150C,thank you!
There is graphical data representing operating current over VM voltage in the datasheet in section 6.8 Typical Characteristics.
Figure 6.3 and 6.4 show operating current over VM and temperature respectively. The figures show a temperature range from -40 to 125 degrees Celsius.
Best,
David
Hi Zhiyuan,
One more question, when the nsleep PIN rise from low to high. How long does it take to drive the motor?From datasheet it seems that after Twake the device will go to operating mode
Yes, when the nSLEEP pin rises from low to high a period of TWAKE must elapse before the device is ready to receive inputs in the operating mode.
do we need to configure all the register again before we can drive the motor?
The registers will not need to be reconfigured when exited the sleep mode. As long as no faults have occurred the device should return to normal operation when the nSLEEP pin returns high.
If any faults have occurred the nSLEEP pin may also be used to reset any faults by pulsing for a specific time period.
Best,
David
