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參數(shù)資料
| 型號(hào)： | 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(dòng)器) |
| 中文描述： | 超級(jí)智能電機(jī)橋式驅(qū)動(dòng)器（電機(jī)橋驅(qū)動(dòng)器） |
| 文件頁數(shù)： | 9/21頁 |
| 文件大?。?/td> | 160K |
| 代理商： | L9942 |
MICROCONTROLLER SECTION
Contact monitors (C0 ... C6)
The device provides 7 contactmonitoring pins suited to sense the statusof 7 switches to ground. An ex-
ternal resistor in series to the inputs is used to set the current level and protect the inputs from external
EMI pulses. External series resistor should not be lower than 100
. The value of the series resistor has
to be calculatedusing the following formula:
Example: V
S
= 13.5V
I
O
= 20mA
R
prot
= 175
with R
DSON
= 500
The maximum current (short circuit) for each contactmonitor is 50mA (at V
S
= 15V).
Contact Monitor characteristics
Symbol
I
CMSC
I
CMTH
I
CMHY
Parameter
Test Condition
Short to GND, V
S
= 15V
Min.
10
0.5
8
Typ.
30
1.5
10
Max.
50
2.5
12
Unit
mA
mA
% of
ICMTH
Short circuit current
Input threshold current
Input threshold hysteresis
In order to reducepower consumption, a dynamicmonitoring is implemented asdescribed below:
The contact monitor consists of a strobe decoder, seven identical contact monitor channels, an interrupt
logic. The contact monitor is permanentlysupplied with a 32kHzclock signal SBCLK from standby oscil-
lator. This signal is also active in STOP mode of the controller keeping active the contact monitoring.
The strobe decoder generates control signals for the channel logic in order to sense one contact after
the other as shown below. Each channel is activated every16ms for about 30
μ
s (precisely one period of
standby oscillator clock) and strobedafter 15
μ
s.
This scheme allows 15
μ
s of settling time for the sensing current at the external contacts. The duty cycle
of the contactcurrent is 1/512.
16ms
30
μ
s
t
I
15
μ
s
Strobe
Strobe
Figure 3. Sensingcurrent for one channel.
L9942
9/21
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