L9942 データシートの表示（PDF） - STMicroelectronics
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L9942 Datasheet PDF : 40 Pages
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Block diagram and pin information
1
Block diagram and pin information
L9942
Figure 1. Block diagram
VCC
STEP
EN
PWM
DO
Oscillator
CP
Charge
Pump
Diagnostic
Gate-Driver
&
PWM-Controller
DI
CLK
CSN
Diagnostic
Gate-Driver
&
PWM-Controller
Biasing
U/I-
Converter
GND
RREF
VBAT
ReversePolarityProtection
VS
QA1
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)
QA2
QB1
Stepper
Motor
QB2
GNDP
GND
Figure 2. Pin connection (top view)
PGND 1
QA1 2
Power SSO24
24 PGND
23 QA2
VS 3
22 VS
CLK 4
21 EN
DI 5
20 RREF
CSN 6
DO 7
Exposed
Pad
19 VCC
18 TEST
PWM 8
17 GND
STEP 9
16 CP
VS 10
15 VS
QB1 11
PGND 12
14 QB2
13 PGND
All pins with the same name must be externally connected!
All pins PGND are internally connected to the heat slug.
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Doc ID 11778 Rev 7
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