DocID025336 Rev 1

13/23

AN4370

Unused pins

22

6

Unused pins

Table 2 shows the recommended connections for the unused pins of the device.

Table 2. Unused pins connection

Block/feature not used

Pins

Connection

CSA

CSI+/CSI-

Tied together and connected to GND

CSO

OPEN

Disable

DIS

GND

Analog MUX

AOUT

OPEN

BEMF detection IP

BEMFOUT

OPEN

1.

BEMF detection IP not used or BEMFCNT SPI update mode selected.

2.

In Active Mode, the BC pin can be connected to GND. However it can be pulled high to enter Flash Mode

and program the external microcontroller.

Digital output

DOUT

OPEN

Interrupt to microcontroller

NINT

OPEN

NC

PIN 28

OPEN or VDD

PIN 25

OPEN or 1 K

Ω to VS

5 V voltage regulator

VDD

Ceramic capacitor

≥ 660 nF tied to GND and at least

6 mA dummy load

NRES

Open or to a microcontroller GPIO to monitor

microcontroller reset attempts triggered by the

device

INH wake-up source from

Standby Modes

INH

OPEN or GND