Datasheet

Block diagram and pin information L9942
6/40 Doc ID 11778 Rev 7
1 Block diagram and pin information
Figure 1. Block diagram
Figure 2. Pin connection (top view)
Gate-Driver
&
PWM-Controller
SPI + Register + Logic
Phase Counter+Current Profile
⇓
PWM Current DAC
Diagnostic
Charge
Pump
U/I-
Converter
VCC
VBAT
ReversePolarityProtection
CSN
CLK
DI
DO
EN
STEP
μC
Oscillator
Biasing
VS
GND
Note: value of capacitor has
to be choosen carefully to
limit the VS voltage below
absolute maximum ratings in
case of an unexpected
freewheeling condition (e.g.
TSD, POR)
Stepper
Motor
QA1
QA2
QB1
QB2
Gate-Driver
&
PWM-Controller
RREF
Diagnostic
CP
PWM
GNDP
QB2QB2
GND
All pins with the same name must be externally connected!
All pins PGND are internally connected to the heat slug.
PGND 1
QA1
2
VS
3
4
DI
5
CSN
6
DO
7
8
STEP 9
VS 10
QB1 11
PGND 12
PWM
PGND24
QA223
22
EN21
RREF20
VCC19
TEST18
17
CP16
VS15
QB214
PGND13
GND
Power SSO24
Exposed
Pad
VS
CLK