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L9942 Datasheet(PDF) 6 Page - STMicroelectronics

Part # L9942
Description  Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9942 Datasheet(HTML) 6 Page - STMicroelectronics

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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
Diagnostic
Charge
Pump
U/I-
Converter
VCC
VBAT
ReversePolarityProtection
CSN
CLK
DI
DO
EN
STEP
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
QB2
QB2
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
PGND
24
QA2
23
22
EN
21
RREF
20
VCC
19
TEST
18
17
CP
16
VS
15
QB2
14
PGND
13
GND
Power SSO24
Exposed
Pad
VS
CLK



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