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參數(shù)資料
| 型號： | L9942 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, PDSO36 |
| 封裝： | POWER, SO-36 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大小： | 161K |
| 代理商： | L9942 |
POWER SUPPLY
DC Electrical characteristics. (Tamb = -40 to +85
°C)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VSsup
Operating supply voltage
8
24
V
IsSTOP
Supply current with
microcontroller in STOP mode
No external loads, all switches
open, RC oscillator running.
70
200
A
IsRUN
Supply current with
microcontroller in RUN mode.
No external loads, all switches
open.
50
mA
Voltage regulator characteristics.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Vsmin
Minimum input (VS) voltage
8
V
VoRUN
VCC Output voltage
Micro in RUN mode
4.75
5
5.25
V
IoRUN
Max output current from pin
VCC
No loads connected to PORTA,
micro in RUN mode
50
mA
VoSTOP
VCC Output voltage
Micro in STOP mode
4.5
5
5.5
V
IoSTOP
Max output current from pin
VCC
Micro in STOP mode
1
mA
Imax
Current limitation
Micro in RUN mode
100
mA
Quick Reference
The microcontroller is equipped with a 4K pro-
gram ROM which can also be used for data table
storage (shared with user program), a data RAM
of 128 bytes, a watchdog with 64 different pro-
grammable reset times, a standard 8 bit timer
with 7 bit programmable prescaler, a basic CAN
controller plus line interface, a dynamic contact
monitor with wake up facility for up to seven
ground contacts, a standard digital 4 bit input/out-
put port. Each digital I/O pin can individually be
defined by software to work in one of the follow-
ing modes:
opendrain output, push-pull output, input, input
with pull-up or interrupt input with pull-up. The I/O
port can be connected to the CAN module by
software configuration.
The power section of the device consists of a
DMOS full bridge (200mW each DMOS), directly
controlled by the microcontroller. The power tran-
sistors are protected against short circuit, overvol-
tage, overtemperature. A charge pump without
external components provides the gate voltage
for the high side switches of the bridge.
The microcontroller and its periphery is supplied
by a 5V regulator with low standby current which
also generates a proper reset signal at power
on/off.
A low power 32kHz RC oscillator provides a clock
signal for the contact monitor circuitry as well as a
real time wakeup counter. The clock signal for the
CPU and the peripheral devices like timer, watch-
dog, CAN controller etc. is generated by a XTAL
clock generator.
Description
The power part of the device consists of two iden-
tical independent DMOS half bridges. It is suited
to drive resistive and inductive loads.
An integrated charge pump generates the high
voltage required by the gate driving circuit for the
upper DMOS transistors.
The Rdson of each of the 4 DMOS transistors is
200mW at room temperature.
The nominal current is 3.5A. A maximum current
of 6A can be supplied.
A thermal sensing circuit issues one thermal
warning flag at 130
°C junction temperature and a
second one at 150
°C.
The ST6-core controls all operations of the power
stage. Undervoltage, overvoltage short circuit and
overtemperature conditions are reported to the
CPU using dedicated error flags.
Overvoltage and short circuit conditions switch off
the bridge immediately without CPU intervention.
At overtemperature the CPU has to switch off the
bridge by software.
The function of the flags is independent of the op-
eration mode of the bridge (sink, source, Z).
L9942
3/21
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