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参数资料
| 型号： | MC33794EK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR ELECTRIC FIELD 54SOICW |
| 产品目录绘图： | MC33794EK(R2) Top MC33794EK(R2) Side |
| 标准包装： | 26 |
| 类型： | 传感器接口 |
| 输入类型： | 逻辑 |
| 输出类型： | 逻辑 |
| 接口： | ISO9141 |
| 电流 - 电源： | 7mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 54-BSSOP（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 54-SOIC W EP |
| 包装： | 管件 |
Sensors
Freescale Semiconductor
3
MC33794
SOICW-EP TERMINAL CONNECTIONS
Figure 2. SOICW-EP Terminal Connections
Table 1. SOICW-EP TERMINAL FUNCTION DESCRIPTION
Terminal
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 REG 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 terminal must be asserted and deserted 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 terminal 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 terminals 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 terminal.
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 terminal. 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.
LAMP_OUT
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
SHIELD_EN
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_CTRL
ISO-9414
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