MC33794 Просмотр технического описания (PDF) - Freescale Semiconductor
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MC33794 Datasheet PDF : 18 Pages
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SOICW-EP TERMINAL CONNECTIONS
RST
1
WD_IN
2
NC
3
LAMP_GND
4
NC
5
LAMP_OUT
6
NC
7
LAMP_SENSE
8
LAMP_MON
9
SHIELD_EN
10
D
11
C
12
B
13
A
14
SIGNAL
15
LEVEL
16
PWR_MON
17
LP_CAP
18
R_OSC
19
NC
20
NC
21
NC
22
NC
23
CLK
24
VDD_MON
25
VDD
26
VPWR
27
54
LAMP_CTRL
53
ISO-9414
52
NC
51
ISO_IN
50
NC
49
NC
48
NC
47
ISO_OUT
46
REF_B
45
REF_A
44
E9
43
E8
42
E7
41
E6
40
E5
39
E4
38
E3
37
E2
36
E1
35
TEST
34
NC
33
NC
32
GND
31
NC
30
SHIELD
29
AGND
28
VCC
Figure 2. SOICW-EP Terminal Connections
Table 1. SOICW-EP TERMINAL FUNCTION DESCRIPTION
Terminal
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
4
NC
LAMP_GND
No connect
These terminals may be used at some future date and should be left open.
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.
Sensors
Freescale Semiconductor
MC33794
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