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參數(shù)資料
| 型號(hào)： | L9942 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, PDSO36 |
| 封裝： | POWER, SO-36 |
| 文件頁數(shù)： | 21/21頁 |
| 文件大小： | 161K |
| 代理商： | L9942 |
MICROCONTROLLER SECTION
Contact monitors (C0 ... C6)
The device provides 7 contact monitoring pins suited to sense the status of 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 calculated using the following formula:
Example: VS = 13.5V
IO = 20mA
Rprot = 175
with RDSON = 500
The maximum current (short circuit) for each contact monitor is 50mA (at VS = 15V).
Contact Monitor characteristics
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
ICMSC
Short circuit current
Short to GND, VS = 15V
10
30
50
mA
ICMTH
Input threshold current
0.5
1.5
2.5
mA
ICMHY
Input threshold hysteresis
8
10
12
% of
ICMTH
In order to reduce power consumption, a dynamic monitoring is implemented as described below:
The contact monitor consists of a strobe decoder, seven identical contact monitor channels, an interrupt
logic. The contact monitor is permanently supplied with a 32kHz clock 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 every 16ms for about 30
s (precisely one period of
standby oscillator clock) and strobed after 15
s.
This scheme allows 15
s of settling time for the sensing current at the external contacts. The duty cycle
of the contact current is 1/512.
16ms
30
s
t
I
15
s
Strobe
Figure 3. Sensing current for one channel.
L9942
9/21
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