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參數(shù)資料
| 型號(hào)： | MC33794 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | Electric Field Imaging Device(電場(chǎng)成像設(shè)備) |
| 中文描述： | 電場(chǎng)成像設(shè)備（電場(chǎng)成像設(shè)備） |
| 文件頁(yè)數(shù)： | 4/20頁(yè) |
| 文件大?。?/td> | 742K |
| 代理商： | MC33794 |
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33794
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Go to: www.freescale.com
21
ISO-9141
ISO-9141 Bus
This pin connects to the ISO-9141 bus. It provides the drive and detects signaling
on the bus and translates it from the bus level to logic levels for the MCU.
22
LAMP_CTRL
Lamp Control
This signal is used to control the lamp driver. A high logic level turns on the lamp
23
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.
24
WD_IN
Watchdog Input
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.
25
LAMP_GND
Lamp Ground
This is the ground for the current from the lamp. The current into LAMP_OUT flows
out through this pin.
26
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 pin. 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.
28
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.
29
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.
30
DIS_SHIELD
Shield Driver Disable
This pin is used to turn off the shield signal. The purpose of doing this is to be able
to detect that the shield signal is not working or the connection to the coax shields
is broken. If either of these conditions exists, there will be little or no change in the
capacitance measured when the DIS_SHIELD is asserted. If the SHIELD output is
working and properly connected, the capacitance of the coax will not be cancelled
when this pin is asserted and the measured capacitance will appear to change by
approximately the capacitance between the center conductor and the shield in the
coax.
34–31
A, B, C, D
Selector Inputs
These input pins control which electrode or reference is active. Selection values
are shown in Table 1, Electrode Selection, page 14.
35
SIGNAL
Undetected Signal
This is the undetected signal being applied to the detector. It has a DC level with
the low radio frequency signal superimposed on it. Care must be taken to minimize
DC loading of this signal. A shift of DC will change the center point of the signal
and adversely affect the detection of the signal.
36
LEVEL
Detected Level
This is the detected, amplified, and offset representation of the signal voltage on
the selected electrode. Filtering of the rectified signal is performed by a capacitor
attached to LP_CAP.
37
PWR_MON
Power Monitor
This is connected through a voltage divider to V
PWR
. It allows reduction of the
voltage so it will fall within the range of the ADC on the MCU.
38
LP_CAP
Low-Pass Filter Capacitor
A capacitor on this pin forms a low pass filter with the internal series resistance
from the detector to this pin. This pin can be used to determine the detected level
before amplification or offset is applied. A 10 nF capacitor connected to this pin will
smooth the rectified signal. More capacitance will increase the response time
unnecessarily.
HSOP PIN FUNCTION DESCRIPTION (continued)
Pin
Pin Name
Formal Name
Definition
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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