參數(shù)資料
型號(hào)： MC33794DWB
廠商： MOTOROLA INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： Electric Field Imaging Device
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO54
封裝： 0.300 INCH, PLASTIC, SOIC-54
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 491K
代理商： MC33794DWB
33794
6
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
LAMP_CTRL
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_OUT
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_CTRL
Lamp Control
This signal is used to control the lamp driver. A high logic level turns on the lamp.
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.
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