l9942 STMicroelectronics, l9942 Datasheet - Page 6

• Manufacturer Part Number: l9942
• Description: Integrated Stepper Motor Driver For Bipolar Stepper Motors With Microstepping And Programmable Current Profile
• Manufacturer: STMicroelectronics

Block diagram and pin information
1
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Block diagram and pin information
Figure 1.
Figure 2.
Block diagram
Pin connection (top view)
STEP
EN
PWM
DO
DI
CLK
CSN
PGND 12
PGND
PWM
STEP 9
CSN 6
QA1 2
QB1 11
CLK
DO 7
VS 3
VS 10
VCC
DI 5
Oscillator
Biasing
4
8
1
GND
All pins with the same name must be externally connected!
All pins PGND are internally connected to the heat slug.
Diagnostic
Diagnostic
Converter
Charge
Pump
U/I-
CP
RREF
Power SSO24
PWM-Controller
PWM-Controller
Gate-Driver
Gate-Driver
Exposed
&
&
Pad
VS
GNDP
GND
VBAT
ReversePolarityProtection
QA1
QA2
QB1
QB2
QB2
QB2
Stepper
Note: value of capacitor has
to be choosen carefully to
limit the VS voltage below
absolute maximum ratings in
case
freewheeling
TSD, POR)
Motor
24
23
22
21
20
19
18
17
16
15
14
13
PGND
QA2
VS
EN
RREF
VCC
TEST
GND
CP
VS
QB2
PGND
of
an
condition (e.g.
unexpected
L9942