參數(shù)資料
型號(hào)： MC33794DH/R2
廠(chǎng)商： MOTOROLA INC
元件分類(lèi)： 模擬信號(hào)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(yè)數(shù)： 17/23頁(yè)
文件大?。?/td> 574K
代理商： MC33794DH/R2
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33794
3
HEAT
SINK
GN
D
HSOP PIN FUNCTION DESCRIPTION
Pin
Pin Name
Formal Name
Definition
1
VCC
5.0 V Regulator Output
This output pin requires a 47
F capacitor and provides a regulated 5.0 V for the
MCU and for internal needs of the 33794.
2, 5, 27, 43
NC
No connect
These pins may be used at some future date and should be left open.
3
AGND
Analog Ground
This pin is connected to the ground return of the analog circuitry. This ground should
be kept free of transient electrical noise like that from logic switching. Its path to the
electrical current return point should be kept separate from the return for GND.
4
SHIELD
Shield Driver
This pin connects to cable shields to cancel cable capacitance.
6, Heat Sink
GND
Ground
This pin and metal backing is the IC power return and thermal radiator/conductor.
7
TEST
Test Mode Control
This pin is normally connected to circuit ground. There are special operating modes
associated with this pin when it is not at ground.
8–16
E1–E9
Electrode Connections
These are the electrode pins. They are connected either directly or through coaxial
cables to the electrodes for measurements. One of these electrodes can be selected
at a time for capacitance measurement. All of the other unselected electrodes are
grounded by an internal switch. The signal at the selected electrode pin is routed to
the shield driver amplifier by an internal switch. All of the coaxial cable shields should
be isolated from ground and connected SHIELD.
17, 18
REF_A,
REF_B
Reference Connections
These pins can be individually selected like E1 through E9. Unlike E1 through E9,
these pins are not grounded when not selected. The purpose of these pins is to allow
known capacitors to be measured. By using capacitors at the low and high end of the
expected range, absolute values for the capacitance on the electrodes can be
computed.
19
ISO_OUT
ISO-9141 Output
This pin translates ISO-9141 receive levels to 5.0 V logic levels for the MCU.
20
ISO_IN
ISO-9141 Input
This pin accepts data from the MCU to be sent over the ISO-9141 communications
interface. It translates the 5.0 V logic levels from the MCU to transmit levels on the
ISO-9141 bus.
VCC
E5
E6
E7
E8
E9
REF_A
REF_B
ISO_OUT
ISO_IN
ISO-9141
LAMP_OUT
GND
TEST
E1
E2
E3
E4
AGND
SHIELD
NC
VPWR
B
C
D
DIS_SHIELD
LAMP_MON
LAMP_SENSE
NC
LAMP_CTRL
LAMP_GND
WD_IN
RST
R_OSC
LP_CAP
PWR_MON
LEVEL
SIGNAL
A
VDD
VDD_MON
CLK
NC
1
12
13
14
15
16
17
18
19
20
21
22
6
7
8
9
10
11
3
4
5
2
44
33
32
31
30
29
28
27
26
25
24
23
39
38
37
36
35
34
42
41
40
43
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