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Fujitsu MB95F430 manual

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Table of contents for the manual

  • Page 1

    Fujitsu Semiconductor (Shanghai) Co., Ltd. MCU-AN-500080-E-10 Application Note F²MC-8FX FAMILY 8-BIT MICROCONTROLLER MB95F430 SERIES OPERATIONAL AMPLIFIER APPLICATION NOTE[...]

  • Page 2

    Operational Amplifier Version 1.0 Revision History Revision History Date Author Change of Records 2010-03-22 Folix V1.0, First draft This manual contains 18 pages. 1. The products described in this manual a nd the specif ications thereof ma y be cha nged without prior notice. To obtain up-to-date informati on and/or spec ifications, contact your Fu[...]

  • Page 3

    Operational Amplifier Version 1.0 CONTENTS CONTENTS Revision History .......................................................................................................................... 2  Table of Contents ........................................................................................................................ 3  1  I[...]

  • Page 4

    Operational Amplifier Version 1.0 Chapter 1 Introduction 1 Introduction In this document, we will introduce how to use the amplifier function on the MB95F430 series. Chapter 2 gives an overview on operational amplifier. Chapter 3 introduces the operations of operational amplifier. Chapter 4 introduces Operational Amplifier setting procedure. Chapte[...]

  • Page 5

    Operational Amplifier Version 1.0 Chapter 2 Amplifier Overview 2 Amplifier Overview Amplifier Overview The operational amplifier can be used to sense the ground current, and support front-end analog signal conditioning prior to A/D conversion. It can operate in either closed loo p mode or standalone open loop mode. The operational amplifier can be [...]

  • Page 6

    Operational Amplifier Version 1.0 Chapter 2 Amplifier Overview 2.1 Block Diagram of Operational Amplifier Figure 1 Block Diagram of Operational Amplifier 2.2 Pins of Operational Amplifier The OPAMP uses the OPAMP_P pin and the OPAMP_N pin as the analog input pins of the operational amplifier, and uses the OPAMP_O pin as the analog output pin of the[...]

  • Page 7

    Operational Amplifier Version 1.0 Chapter 2 Amplifier Overview 2.3 OPAMP Control Register The OPAMP control register (OPCR) is used to turn on and off the OPAMP, to enable and disable OPAMP analog output, and to enable and disable OPAMP analog input. The register can also be used to set the OPAMP to operate as a standalone open loop operational amp[...]

  • Page 8

    Operational Amplifier Version 1.0 Chapter 2 Amplifier Overview ■ Functions of Bits in OPAMP Control Register (OPCR) ■ OPAMP Operating Mode Settings Notes: • While the OPAMP is operating, modifying the settings of RES2, RES1 and RES0 is allowed, however, do not use the output signal of the OPAMP or execute A/D conversion until OPAMP output bec[...]

  • Page 9

    Operational Amplifier Version 1.0 Chapter 3 Operations of Operational Amplifie r 3 Operations of Operational Amplifier Operations of Operational Amplifier The operational amplifier can be activated by setting the PD bit in the OPCR register using the software. It can operate in closed loop mode or open loop mode, depending on the settings of the RE[...]

  • Page 10

    Operational Amplifier Version 1.0 Chapter 4 Amplifier setting procedure 4 Amplifier setting procedure Below is an example of procedure for setting the operational amplifier. ● Initial settings 1) Set both OPCR: OPID and OPCR: OPOD to "0" to enable both OPAMP analog input and OPAMP analog output. 2) Set the feedback resistor and RES [2:0[...]

  • Page 11

    Operational Amplifier Version 1.0 Chapter 5 Amplifier Driver 5 Amplifier Driver This is OPAMP driver description. 5.1 Peripheral Usage The MCU pins used as below: OPAMP_N,used as amplifier negative input; OPAMP_P,used as amplifier positive input; OPAMP_O,used as amplifier output; 5.2 Driver Code 5.2.1 General Definition typedef unsigned char BOOLEA[...]

  • Page 12

    Operational Amplifier Version 1.0 Chapter 5 Amplifier Driver 5.2.2 Amplifier Routine void AmpOpenLoop() Return : none. Parameters : none. Description : open-loop setting. Example : AmpOpenLoop(); void AmpOpenLoop() { DDR6_P60=0; DDR6_P61=0; DDR6_P62=1; OPCR=0x60; //Amplifier gain is R3/R1 } void AmpCloseLoop() Return : none. Parameters : none. Desc[...]

  • Page 13

    Operational Amplifier Version 1.0 Chapter 6 Typical Application 6 Typical Application This is the typical application introduction. 6.1 HW Design In this application, we will test the operational amplifier in the MB95F430K. The HW is designed as below. The R1, R2, R3 is used in open-loop amplifier. 6.2 Sample Code void main(void) Return : none. Par[...]

  • Page 14

    Operational Amplifier Version 1.0 Chapter 7 More Information 7 More Information For more Information on FUJITSU Semiconductor products, visit the following websites: English version: http://www.fujitsu.com/cn/fsp/serv ices/mcu/mb95/application_notes.html Simplified Chinese Version: http://www.fujitsu.com/cn/fss/servic es/mcu/mb95/application_notes.[...]

  • Page 15

    Operational Amplifier Version 1.0 Chapter 8 Appendix 8 Appendix Figure 1 Block Diagram of Operational Amplifier ................................................................................ 6  Figure 2 OPAMP Control Register ......................................................................................................... 7  Figure [...]

  • Page 16

    Operational Amplifier Version 1.0 Chapter 9 Sample Code 9 Sample Code main.c #include "mb95430.h" #include "TypeDef.h" /*---------------------------------------------------------------------------*/ /* Amplifier Setting /*---------------------------------------------------------------------------*/ void AmpOpenLoop() { DDR6_P60=[...]

  • Page 17

    Operational Amplifier Version 1.0 Chapter 9 Sample Code /* ILRx IRQs defined by ILRx */ ILR0 = 0xFF; // IRQ0: external interrupt ch0 | ch4 / / I R Q 1 : e x t e r n a l i n t e r r u p t c h 1 | c h 5 / / I R Q 2 : e x t e r n a l i n t e r r u p t c h 2 | c h 6 / / I R Q 3 : e x t e r n a l i n t e r r u p t c h 3 | c h 7 ILR1 = 0xFF; // IRQ4: UAR[...]

  • Page 18

    Operational Amplifier Version 1.0 Chapter 9 Sample Code MCU-AN-500080-E-10 - Page 18 #pragma intvect DefaultIRQHandler 6 // IRQ6: 8/16-bit timer ch0 (upper) #pragma intvect DefaultIRQHandler 7 // IRQ7: Output Compare ch0 #pragma intvect DefaultIRQHandler 8 // IRQ8: Output Compare ch1 #pragma intvect DefaultIRQHandler 9 // IRQ9: none #pragma intvect[...]