POWERSTEP01 datasheet(22/92 Pages) STMICROELECTRONICS

22 / 92 page

Functional description

powerSTEP01

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DocID025022 Rev 5

Functional description

7.1

Device power-up

During power-up, the device is under reset (all logic IOs disabled and power bridges in high

impedance state) until the following conditions are satisfied:



VREG is greater than VREGthOn



Internal oscillator is operative



STBY/RESET input is forced high.

After power-up, the device state is the following:



Parameters are set to default



Internal logic is driven by internal oscillator and a 2-MHz clock is provided by the

OSCOUT pin



Bridges are disabled (high impedance).



FLAG output is forced low (UVLO failure indication).

After power-up, a period of tlogicwu must pass before applying a command to allow proper

oscillator and logic startup.

Any movement command makes the device exit from High Z state (HardStop and SoftStop

included).

7.2

Logic I/O

Pins CS, CK, SDI, STCK, SW and STBY/RESET are TTL/CMOS 3.3 V to 5 V compatible

logic inputs.

Pin SDO is a TTL/CMOS compatible logic output. VDD pin voltage imposes logical output

voltage range.

Pins FLAG and BUSY/SYNC are open-drain outputs.

SW and CS inputs are internally pulled up to VDD and STBY/RESET input is internally pulled

down to ground.

7.3

Charge pump

To ensure the correct driving of the high-side integrated MOSFETs, a voltage higher than

the motor power supply voltage needs to be applied to the VBOOT pin. The high-side gate

driver supply voltage VBOOT is obtained through an oscillator and a few external

components realizing a charge pump (see Figure 5).

POWERSTEP01 Datasheet(PDF) 22 Page - STMicroelectronics

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