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参数资料
| 型号： | MC33794DH/R2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Electric Field Imaging Device |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO44 |
| 封装： | PLASTIC, HSOP-44 |
| 文件页数： | 21/23页 |
| 文件大小： | 574K |
| 代理商： | MC33794DH/R2 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33794
7
10
DIS_SHIELD
Shield Driver
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.
14–11
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.
15
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.
16
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.
17
PWR_MON
Power Monitor
This is connected through a voltage divider to VPWR. It allows reduction of the
voltage so it will fall within the range of the ADC on the MCU.
18
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.
19
R_OSC
Oscillator Resistor
A resistor from this pin to circuit ground determines the operating frequency of the
oscillator. The 33794 is optimized for operation around 120 kHz.
24
CLK
Clock
This pin provides a square wave output at the same frequency as the internal
oscillator. The edges of the square wave coincide with the peaks (positive and
negative) of the sine wave.
25
VDD_MON
VDD Monitor
This is connected through a voltage divider to VDD. It allows reduction of the voltage
so it will fall within the range of the ADC on the MCU.
26
VDD
VDD Capacitor
A capacitor is connected to this pin to filter the internal analog regulated supply. This
supply is derived from VPWR.
27
VPWR
Positive Power Supply
12 V power applied to this pin will be converted to the regulated voltages needed to
operate the part. It is also converted to 5.0 V (VCC) and 8.5 V (VDD) to power the
MCU and external devices.
28
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.
29
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.
30
SHIELD
Shield Driver
This pin connects to cable shields to cancel cable capacitance.
32
GND
Ground
This pin and metal backing is the IC power return and thermal radiator/conductor.
35
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.
SOICW-EP PIN FUNCTION DESCRIPTION (continued)
Pin
Pin Name
Formal Name
Definition
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| MC33794DWB | 功能描述:IC SENSOR ELECTRIC FIELD 54-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| MC33794DWBR2 | 功能描述:IC SENSOR ELECTRIC FIELD 54-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| MC33794EK | 功能描述:近程传感器 ODS 54LD RoHS:否 制造商:Vishay Semiconductors 感应方式:Optical 感应距离:1 mm to 200 mm 电源电压:2.5 V to 3.6 V 安装风格:SMD/SMT 输出配置:Digital 最大工作温度:+ 85 C 最小工作温度:- 25 C 系列:VCNL3020 |
| MC33794EKR2 | 功能描述:近程传感器 ODS 54LD RoHS:否 制造商:Vishay Semiconductors 感应方式:Optical 感应距离:1 mm to 200 mm 电源电压:2.5 V to 3.6 V 安装风格:SMD/SMT 输出配置:Digital 最大工作温度:+ 85 C 最小工作温度:- 25 C 系列:VCNL3020 |
| MC33797BPEW | 功能描述:功率驱动器IC Four Channel Squib Dr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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