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参数资料
| 型号： | MC34921AER2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 25/36页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR PWM DC DUAL 64LQFP |
| 标准包装： | 1,500 |
| 应用： | DC 电机驱动器，步进电机驱动器，H 桥式 |
| 输出数： | 2 |
| 电流 - 输出： | ±4.5A |
| 电压 - 负载： | 0 V ~ 38 V |
| 电源电压： | 4.8 V ~ 5.2 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP 裸露焊盘 |
| 供应商设备封装： | 64-LQFP EP（10x10） |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
The Agilent HEDS-9710/HEDS-9711 incremental analog
quadrature encoder is a 200 lpi encoder that outputs a
quadrature analog current reflecting the position of the
encoder codewheel/codestrip within the encoder. The analog
encoder interface must provide six functions to support this
encoder: force a bias point of 1.3 V, current-to-voltage
conversion, offset current nulling, output amplitude adjust
ENC_FILTA
(variable gain), channel inversion, and digital phase
generation (see Figure 13 ).
Note: Freescale does not assume liability, endorse, or
warrant components from external manufacturers that are
referenced in this document. While Freescale offers
component recommendations, it is the customer ’s
responsibility to validate their application.
AN2/ANALOGIN_A
A
A
1.3 V
Variable Gain
Amplifier
Variable Gain
Amplifier
-1
A
B
A
DENCA
DENCB
B
To ADC
To Serial
Interface
AN3/ANALOGIN_B
ENC_FILTB
-1
B
B
To ADC
Figure 13. Analog Encoder Interface Block Diagram
I/V Conversion Stage
The I/V conversion stage is carried out by a
transimpedance amplifier using an external resistor. There is
a resistor to ground at the ANALOGIN_x input to allow offset
current trim and force the proper bias point on the encoder.
The feedback resistor should be sized to accommodate
±2.5 V output voltage swing for the full encoder current
waveform. For example, if the encoder produces a ±50 μ A
signal, the feedback resistor needs to be 50 k ? .
The resistor to ground must have a specific relationship to
the feedback resistor. It needs to be 1.17 times the feedback
resistor, or 58.5 k ? for the example above. This ensures that
the encoder is biased at 1.35 V, and that the output of the
transimpedance amplifier is 2.5 V.
The I/V conversion stage can trim an encoder offset
current of up to ±8.0 μ A in the encoder output.
Variable Gain Amplifier
The I/V conversion stage is followed by a variable gain
amplifier that can compensate for variations in the encoder
output. This is designed to accommodate manufacturing
variations in the encoder, as well as aging and other effects.
The gain can be changed over the serial interface at any time.
The output of the variable gain amplifiers can be routed to
the ANALOGOUT_x terminals for engineering evaluation.
Otherwise, these terminals are general purpose A/D inputs.
Channel Inversion and Digital Phase Generation
The A and B channels are inverted by applying the
function CHANNELx = 2.5 V - CHANNELx. This results in four
signals: A, B, A , and B . These signals are used produce the
digital encoder signals DENCA and DENCB, which are
information. The value of the DENCA and DENCB signals
determine which signal—A, B, A , or B —is converted. Refer to
Position Information
The entire position information is produced by
concatenating the value of the a quadrature counter, driven
by DENCA and DENCB bits, and the 8 bits of “fractional”
information from the ADC.
Calibration of the Encoder
It is necessary to adjust the gain and offset of the I/V circuit
initially and periodically to compensate for encoder-to-
encoder variation, aging, and other effects. The ADC “double
conversion” function allows this by continuously sampling the
A and B signals, allowing a map of the encoder output to be
built up. The user will need to provide the necessary
algorithm to use the waveform map to produce gain and
offset calibration values for both channels.
ANALOG-TO-DIGITAL CONVERTER
Introduction
There is an 8-bit analog-to-digital converter (ADC) on the
34921 IC that uses the on-board voltage reference and
derives all the necessary timing signals from the SCLK input.
The ADC is referenced to the same ground as the system
ground (GND).
ADC Input Selection
The ADC has an 8-channel analog multiplexer so that all
inputs share one ADC. The input(s) to be converted are
converted by the ADC to provide the analog position
34921
Analog Integrated Circuit Device Data
Freescale Semiconductor
25
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| MC34923 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 3WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 3WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONNECTOR, RCPT, 3POS, 4.2MM; Series:2266(5566)RA; Pitch Spacing:4.2mm; Contact Termination:Through Hole Vertical; No. of Contacts:3; No. of Rows:1; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Brass ;RoHS Compliant: Yes |
| MC34923DW | 功能描述:马达/运动/点火控制器和驱动器 Motor Driver RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MC34923EG | 功能描述:马达/运动/点火控制器和驱动器 Full-Bridge PWM Motor Driver RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MC34923EGR2 | 功能描述:马达/运动/点火控制器和驱动器 VERSION RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MC34925 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 4WAY 制造商:PRIVATE LABEL 功能描述:HEADER, VERTICAL, 4WAY, Product Range:MULTICOMP - MC34 Series, Contact Terminati 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONNECTOR, RCPT, 4POS, 4.2MM, Series:2266(5566)RA, Pitch Spacing:4.2mm, Contact Termination:Through Hole Vertical, No. of Contacts:4, No. of Rows:1, Connector Mounting:PCB, Gender:Receptacle, Contact Material:Brass , RoHS Compliant: Yes |
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