l9942 STMicroelectronics, l9942 Datasheet - Page 18

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

Electrical specifications
3.4.4
Table 11.
3.4.5
Table 12.
1. MIN= 0.92 · I
18/40
I
R
I
R
QxnLIM_HS
|I
QxnFS_HS
Symbol
Symbol
DSON HS
DSON LS
QxnOC
V
CP
|
On-resistance Qxn to V
On-resistance Qxn to
PGND
Output overcurrent
limitation to VS or PGND
Value of output current to
supply V
scale value)1 sourcing
from HS switch
Accuracy of micro steps
current limit
Charge pump output voltage
Charge pump output
Charge pump output
The ripple of voltage at CP can suppressed using a capacity of e.g.100nF.
Outputs: Qxn (x=A;B n=1;2)
The comparator, which is monitoring current image of HS, is working during ON cycle of
PWM control. If load current is higher as set value then the signal ILIMIT is generated and
after filter time the bridge is switched off. Test mode gets access to signal ILIMIT and
threshold of current can be measured.
Outputs: Qxn (x=A;B n=1;2)
QxnLIM
Parameter
– 0.02 · |I
S
Parameter
(so called full
QxnFS_HS
S
|; MAX= 1.08 · I
V
I
V
I
V
I
V
I
V
I
V
I
test mode exclusive of filter
time 4µs
Bits: DC2 DC1 DC0=000
Bits: DC2 DC1 DC0=001
Bits: DC2 DC1 DC0=010
Bits: DC2 DC1 DC0=011
Bits: DC2 DC1 DC0=100
Bits: DC2 DC1 DC0=101
Bits: DC2 DC1 DC0=110
Bits: DC2 DC1 DC0=111
Qxn
Qxn
Qxn
Qxn
Qxn
Qxn
S
S
S
S
S
S
= 13.5 V, T
= 13.5 V, T
= 7.0 V, T
= 13.5 V, T
= 13.5 V, T
= 7.0 V, T
= -1.0A
= -1.0 A
= -1.0 A
= + 1.0A
= + 1.0 A
= + 1.0 A
V
V
V
S
S
S
Test condition
=7V
=13.5V
=20V
(Chapter
QxnLIM
j
j
Test condition
= 25 °C,
= 25 °C,
j
j
j
j
= 25 °C,
= 125 °C,
= 25 °C,
= 125 °C,
+ 0.02 · |I
2.10)
I
switches off at
Qxn
CP
= -100μA, all
QxnFS_HS
MIN
1000
1200
Min.
100
180
300
485
720
1.6
60
|
(1)
Min.
11
20
30
1150
1350
Typ.
500
750
550
500
750
550
140
230
360
550
810
95
2
Typ.
MAX
Max.
1000
1000
1300
1500
700
750
700
750
130
180
280
420
615
900
Max.
20
35
40
(1)
L9942
Unit
Unit
mΩ
mΩ
mΩ
mΩ
mΩ
mΩ
mA
mA
V
V
V
A