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參數(shù)資料
| 型號： | L9942 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Super Smart Motor Bridge Driver(電機(jī)橋驅(qū)動器) |
| 中文描述： | 超級智能電機(jī)橋式驅(qū)動器（電機(jī)橋驅(qū)動器） |
| 文件頁數(shù)： | 3/21頁 |
| 文件大?。?/td> | 160K |
| 代理商： | L9942 |
POWERSUPPLY
DC Electricalcharacteristics.
(T
amb
= -40 to +85
°
C)
Symbol
VSsup
IsSTOP
Parameter
Test Condition
Min.
8
Typ.
Max.
24
200
Unit
V
μ
A
Operating supply voltage
Supply current with
microcontroller in STOP mode
Supply current with
microcontroller in RUN mode.
No external loads, all switches
open, RC oscillator running.
No external loads, all switches
open.
70
IsRUN
50
mA
Voltage regulator characteristics.
Symbol
Vsmin
VoRUN
IoRUN
Parameter
Test Condition
Min.
8
4.75
50
Typ.
Max.
Unit
V
V
mA
Minimum input (VS) voltage
VCC Output voltage
Max output currentfrom pin
VCC
VCC Output voltage
Max output currentfrom pin
VCC
Current limitation
Micro in RUN mode
No loads connected to PORTA,
micro in RUN mode
Micro in STOP mode
Micro in STOP mode
5
5.25
VoSTOP
IoSTOP
4.5
5
5.5
1
V
mA
Imax
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 standarddigital 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 interruptinput 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 protectedagainst short circuit, overvol-
tage, overtemperature. A charge pump without
external components provides the gate voltage
for the high side switches of thebridge.
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 contactmonitor circuitry as well as a
real time wakeup counter. The clock signalfor the
CPU and the peripheraldevices 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 inductiveloads.
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 temperatureand a
second one at 150
°
C.
The ST6-core controls all operationsof the power
stage. Undervoltage,overvoltageshort circuit and
overtemperature conditions are reported to the
CPU using dedicatederror flags.
Overvoltage and short circuit conditionsswitch off
the bridge immediately without CPU intervention.
At overtemperaturethe CPU has to switch off the
bridge by software.
The functionof the flags is independentof the op-
eration mode of the bridge(sink, source,Z).
L9942
3/21
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