MC33794EKR2 Freescale, MC33794EKR2 Datasheet - Page 3

• Manufacturer Part Number: MC33794EKR2
• Manufacturer: Freescale

Specifications of MC33794EKR2

• Lead Free Status / RoHS Status: Compliant

Table 1. SOICW-EP TERMINAL FUNCTION DESCRIPTION
Sensors
Freescale Semiconductor
20–23, 31,
48–50, 52
Terminal
3, 5, 7,
33, 34,
1
2
4
6
LAMP_GND
LAMP_OUT
Terminal
WD_IN
Name
RST
NC
LAMP_SENSE
LAMP_MON
LAMP_GND
SHIELD_EN
LAMP_OUT
PWR_MON
Formal Name
Lamp Ground
Watchdog In
Lamp Driver
SOICW-EP TERMINAL CONNECTIONS
V
No connect
DD
LP_CAP
SIGNAL
R_OSC
Reset
WD_IN
LEVEL
_
V
MON
Figure 2. SOICW-EP Terminal Connections
RST
CLK
PWR
V
NC
NC
NC
NC
NC
NC
NC
DD
D
C
B
A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
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
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.
This terminal must be asserted and deserted at regular interval in order to
prevent
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.
These terminals may be used at some future date and should be left open.
This is the ground for the current from the lamp. The current into LAMP_OUT
flows out through this terminal.
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.
RST
from being asserted. By having the MCU program perform this
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
LAMP_CTRL
ISO-9414
NC
ISO_IN
NC
NC
NC
ISO_OUT
REF_B
REF_A
E9
E8
E7
E6
E5
E4
E3
E2
E1
TEST
NC
NC
GND
NC
SHIELD
AGND
V
CC
Definition
CC
REG is
MC33794
3