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參數(shù)資料
| 型號： | MC33794DH/R2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Electric Field Imaging Device |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO44 |
| 封裝： | PLASTIC, HSOP-44 |
| 文件頁數(shù)： | 20/23頁 |
| 文件大?。?/td> | 574K |
| 代理商： | MC33794DH/R2 |
33794
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
6
LAMP_CTRL
1
PWR_MON
LP_CAP
R_OSC
NC
CLK
VDD_MON
VDD
VPWR
LEVEL
11
12
13
14
15
16
17
18
19
20
9
10
21
22
23
24
25
26
27
6
7
8
4
5
DIS_SHIELD
D
C
B
A
SIGNAL
NC
LAMP_SENSE
LAMP_MON
NC
LAMP_GND
NC
2
3
54
44
43
42
41
40
39
38
37
36
35
46
45
34
33
32
31
30
29
28
49
48
47
51
50
53
52
RST
WD_IN
NC
E3
E2
E1
TEST
NC
GND
NC
SHIELD
AGND
VCC
E4
REF_A
E9
E8
E7
E6
E5
NC
ISO_OUT
REF_B
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 VCC 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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