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| 型号： | MC33794 |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 英文描述： | Electric Field Imaging Device(电场成像设备) |
| 中文描述： | 电场成像设备（电场成像设备） |
| 文件页数： | 6/20页 |
| 文件大小： | 742K |
| 代理商： | MC33794 |
33794
6
Go to: www.freescale.com
LAMP_OUT
1
2
3
PWR_MON
LP_CAP
R_OSC
NC
NC
NC
NC
CLK
V
DD_
MON
V
DD
V
PWR
LEVEL
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
9
10
6
7
8
4
5
DIS_SHIELD
D
C
B
A
SIGNAL
NC
LAMP_SENSE
LAMP_MON
NC
LAMP_GND
NC
54
53
52
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
46
45
49
48
47
51
50
RST
WD_IN
NC
NC
ISO_OUT
REF_B
E3
E2
E1
TEST
NC
NC
GND
NC
SHIELD
AGND
V
CC
E4
REF_A
E9
E8
E7
E6
E5
NC
ISO_IN
NC
LAMP_CTRL
ISO-9414
SOICW-EP PIN FUNCTION DESCRIPTION
Pin
Pin Name
Formal Name
Definition
1
RST
Reset
This output is intended to generate the reset function of a typical MCU. It has a
delay for Power-ON Reset, level detectors to force a reset when V
CC
is out-of-
range high or low, and a watchdog timer that will force a reset if WD_IN is not
asserted at regular intervals. Timing is derived from the oscillator and will change
with changes in the resistor attached to R_OSC.
2
WD_IN
Watchdog In
This pin must be asserted and deasserted at regular interval in order to prevent
RST
from being asserted. By having the MCU program perform this operation more
often the allowed time, a check that the MCU is running and executing its program
is assured. If this doesn’t occur, the MCU will be reset. If the watchdog function is
not desired, this pin may be connected to CLK to prevent a reset from being
issued.
3, 5, 7,
20–23, 31,
33, 34,
48–50, 52
NC
No connect
These pins may be used at some future date and should be left open.
4
LAMP_GND
Lamp Ground
This is the ground for the current from the lamp. The current into LAMP_OUT flows
out through this pin.
6
LAMP_OUT
Lamp Driver
This is an active low output capable of sinking current of a typical indicator lamp.
One end of the lamp should be connected to a positive supply (for example,
battery voltage) and the other side to this pin. The current is limited to prevent
damage to the IC in the case of a short or surge during lamp turn-on or burn-out.
8
LAMP_SENSE
Lamp Sense
This pin is normally connected to the LAMP_OUT pin. The voltage at this pin is
reduced and sent to LAMP_MON so the voltage at the lamp pin is brought into the
range of the analog-to-digital converter (ADC) in the MCU.
9
LAMP_MON
Lamp Monitor
This pin is connected through a voltage divider to the LAMP_SENSE pin. The
voltage divider scales the voltage at this pin so that battery voltage present when
the lamp is off is scaled to the range of the MCU ADC. With the lamp off, this pin
will be very close to battery voltage if the lamp is not burned out and the pin is not
shorted to ground. This is useful as a lamp check.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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