® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) 1.90 Features Follower or Opamp configuration Unity gain bandwidth > 3.0 MHz Input offset voltage 2.0 mV max Rail-to-rail inputs and output Output direct low resistance connection to pin 25-mA output current Programmable power and bandwidth Internal connection for follower (saves pin) General Description The Opamp component provides a low-voltage, low-power operational amplifier and may be internally connected as a voltage follower. The inputs and output may be connected to internal routing nodes, directly to pins, or a combination of internal and external signals. The Opamp is suitable for interfacing with high-impedance sensors, buffering the output of voltage DACs, driving up to 25 mA; and building active filters in any standard topology. Input/Output Connections This section describes the various input and output connections for the Opamp. An asterisk (*) in the list of I/Os indicates that the I/O may be hidden on the symbol under the conditions listed in the description of that I/O. Noninverting – Analog When the Opamp is configured as a follower, this I/O is the voltage input. If the Opamp is configured as an Opamp, this I/O acts as the standard Opamp noninverting input. Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600 Document Number: 001-84986 Rev. ** Revised December 3, 2012 Operational Amplifier (Opamp) ® PSoC Creator™ Component Datasheet Inverting – Analog * When the Opamp component is configured for Opamp mode, this I/O is the normal inverting input. When the Opamp is configured for Follower mode, this I/O is hard-connected to the output and the I/O is unavailable. Vout – Analog The output is directly connected to a pin. It can drive 25 mA and can be connected to internal loads using the analog routing fabric. When used for internal routing, the output remains connected to the pin. Schematic Macro Information The default Opamp in the Component Catalog is a schematic macro using an Opamp component with default settings. The Opamp component is connected to an analog Pin component named Vout_1. Page 2 of 17 Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) Component Parameters Drag an Opamp component onto your design and double-click it to open the Configure dialog. The Opamp has the following parameters: Mode This parameter allows you to select between two configurations: OpAmp and Follower. Opamp is the default configuration. In this mode, all three terminals are available for connection. In follower mode, the inverting input is internally connected to the output to create a voltage follower. Figure 1. Configuration Options Document Number: 001-84986 Rev. ** Page 3 of 17 ® Operational Amplifier (Opamp) PSoC Creator™ Component Datasheet Power The Opamp works over a wide range of operating currents. Higher operating current increases Opamp bandwidth. The Power parameter allows you to select the power level: In High Power and Med Power modes, the output is a class AB stage, enabling direct drive of high output currents. In Low Power mode, the output is a class A stage with limited current drive. In Low Power Over Compensated (LPOC) mode, the output is a class A stage. For PSoC 3 Production silicon, the LPOC mode is used for low-power transimpedance amplifiers (TIAs). This mode has the same drive capability as low power, but includes added compensation for circuit topologies with higher than normal input capacitance, as seen in photo sensors and other current-output sensors of various types. Wider-bandwidth TIAs can be implemented using the medium or high-power settings. In this case, exercise the usual care in dealing with compensation for capacitively loaded sources. Notes 1. The above description of LPOC mode is correct for PSoC 3 Production silicon only. 2. Only High Power mode is supported on PSoC 5 silicon. Placement Each Opamp is directly connected to specific GPIOs. Noninverting Input Inverting Input Output opamp_0 P0[2] P0[3] P0[1] opamp_1 P3[5] P3[4] P3[6] opamp_2 P0[4] P0[5] P0[0] opamp_3 P3[3] P3[2] P3[7] Refer to the device datasheet for the part being used for the specific physical pin connections. Input signals may use the analog global routing buses in addition to the dedicated input pins. Using the direct connections uses fewer internal routing resources and results in lower route resistance and capacitance. The output pin associated with each specific location will always be driven by the Opamp, when enabled. Ports P0[3] and P3[2] are also used for connection to a capacitor for bypassing the bandgap reference supplied to the ADC, for a reference output, or for an input from an external reference. When these reference connections are used, routing to the Opamp inverting inputs must be done through the analog global routing buses. Page 4 of 17 Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) Figure 2 shows one example of how the Opamp may be connected using the Design-Wide Resources Pin Editor. Figure 2. Example Placement Application Programming Interface Application Programming Interface (API) routines allow you to configure the component using software. The following table lists and describes the interface to each function. The subsequent sections cover each function in more detail. By default, PSoC Creator assigns the instance name “Opamp_1” to the first instance of a component in a given design. You can rename it to any unique value that follows the syntactic rules for identifiers. The instance name becomes the prefix of every global function name, variable, and constant symbol. For readability, the instance name used in the following table is “Opamp.” Function Description Opamp_Start() Turns on the Opamp and sets the power level to the value chosen during the parameter selection. Opamp_Stop() Disables Opamp (power down). Opamp_SetPower() Sets the power level. Opamp_Sleep() Stops and saves the user configuration. Opamp_Wakeup() Restores and enables the user configuration. Opamp_Init() Initializes or restores default Opamp configuration. Opamp_Enable() Enables the Opamp. Document Number: 001-84986 Rev. ** Page 5 of 17 ® Operational Amplifier (Opamp) PSoC Creator™ Component Datasheet Function Description Opamp_SaveConfig() Empty function. Provided for future use. Opamp_RestoreConfig() Empty function. Provided for future use. Global Variables Variable Opamp_initVar Description Indicates whether the Opamp has been initialized. The variable is initialized to 0 and set to 1 the first time Opamp_Start() is called. This allows the component to restart without reinitialization after the first call to the Opamp_Start() routine. If reinitialization of the component is required, then the Opamp_Init() function can be called before the Opamp_Start() or Opamp_Enable() function. void Opamp_Start(void) Description: Turns on the Opamp and sets the power level to the value chosen during the parameter selection. Parameters: None Return Value: None Side Effects: None void Opamp_Stop(void) Description: Turns off the Opamp and enable its lowest power state. Parameters: None Return Value: None Side Effects: None Page 6 of 17 Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) void Opamp_SetPower(uint8 power) Description: Sets the power level. Note Only High Power mode is supported on PSoC 5 silicon. Parameters: uint8 power: Sets the power level to one of four settings: LPOC, Low, Medium, or High. Power Setting Notes Opamp_LPOCPOWER Least power, compensated for TIA Opamp_LOWPOWER Least power, reduced bandwidth Opamp_MEDPOWER Medium bandwidth Opamp_HIGHPOWER Highest bandwidth Return Value: None Side Effects: None void Opamp_Sleep(void) Description: This is the preferred routine to prepare the component for sleep. The Opamp_Sleep() routine saves the current component state. Then it calls the Opamp_Stop() function and calls Opamp_SaveConfig() to save the hardware configuration. Call the Opamp_Sleep() function before calling the CyPmSleep() or the CyPmHibernate() function. Refer to the PSoC Creator System Reference Guide for more information about power management functions. Parameters: None Return Value: None Side Effects: None void Opamp_Wakeup(void) Description: This is the preferred routine to restore the component to the state when Opamp_Sleep() was called. The Opamp_Wakeup() function calls the Opamp_RestoreConfig() function to restore the configuration. If the component was enabled before the Opamp_Sleep() function was called, the Opamp_Wakeup() function will also re-enable the component. Parameters: None Return Value: None Side Effects: Calling the Opamp_Wakeup() function without first calling the Opamp_Sleep() or Opamp_SaveConfig() function may produce unexpected behavior. Document Number: 001-84986 Rev. ** Page 7 of 17 Operational Amplifier (Opamp) ® PSoC Creator™ Component Datasheet void Opamp_Init(void) Description: Initializes or restores the component according to the customizer Configure dialog settings. It is not necessary to call Opamp_Init() because the Opamp_Start() routine calls this function and is the preferred method to begin component operation. Parameters: None Return Value: None Side Effects: All registers will be set to values according to the customizer Configure dialog. void Opamp_Enable(void) Description: Activates the hardware and begins component operation. It is not necessary to call Opamp_Enable() because the Opamp_Start() routine calls this function, which is the preferred method to begin component operation. Parameters: None Return Value: None Side Effects: If the initVar variable is already set, this function only calls the Opamp_Enable() function. void Opamp_SaveConfig(void) Description: Empty function. Provided for future use. Parameters: None Return Value: None Side Effects: None void Opamp_RestoreConfig(void) Description: Empty function. Provided for future use. Parameters: None Return Value: None Side Effects: None MISRA Compliance This section describes the MISRA-C:2004 compliance and deviations for the component. There are two types of deviations defined: project deviations – deviations that are applicable for all PSoC Creator components Page 8 of 17 Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) specific deviations – deviations that are applicable only for this component This section provides information on component-specific deviations. Project deviations are described in the MISRA Compliance section of the System Reference Guide along with information on the MISRA compliance verification environment. The OpAmp component does not have any specific deviations. Sample Firmware Source Code PSoC Creator provides many example projects that include schematics and example code in the Find Example Project dialog. For component-specific examples, open the dialog from the Component Catalog or an instance of the component in a schematic. For general examples, open the dialog from the Start Page or File menu. As needed, use the Filter Options in the dialog to narrow the list of projects available to select. Refer to the “Find Example Project” topic in the PSoC Creator Help for more information. Resources The Opamp component uses one Opamp Fixed block per instance. When used in the Opamp mode with external components (that is, not routing the output through the analog globals), no routing resources are used. API Memory Usage The component memory usage varies significantly, depending on the compiler, device, number of APIs used and component configuration. The following table provides the memory usage for all APIs available in the given component configuration. The measurements have been done with the associated compiler configured in Release mode with optimization set for Size. For a specific design the map file generated by the compiler can be analyzed to determine the memory usage. PSoC 3 (Keil_PK51) Configuration Default PSoC 5 (GCC) PSoC 5LP (GCC) Flash SRAM Flash SRAM Flash SRAM Bytes Bytes Bytes Bytes Bytes Bytes 130 2 198 5 198 5 Document Number: 001-84986 Rev. ** Page 9 of 17 ® Operational Amplifier (Opamp) PSoC Creator™ Component Datasheet DC and AC Electrical Characteristics for PSoC 3 Specifications are valid for –40 °C £ TA £ 85 °C and TJ £ 100 °C, except where noted. Specifications are valid for 1.71 V to 5.5 V, except where noted. DC Characteristics Parameter Description Conditions Min Typ VSSA [1] Max Units – VDDA V VI Input voltage range VIOFF Input offset voltage Temp = –40 °C to +70 °C – 0.5 2 mV TCVos Input offset voltage drift with temperature Power mode = high – ±12 ±30 µV/°C Avol Open-loop gain Power mode = high 90 – – dB Ge1 Gain error, unity gain buffer mode RLOAD = 1 k – – ±0.1 % RIN Input resistance Positive gain, noninverting input – – – M CIN Input capacitance Routing from pin – – 18 pF VO Output voltage range 1 mA, source or sink, power mode = high VSSA + 0.05 – VDDA – 0.05 V 100 K to VDDA/2, G = 1 – – – V VSSA + 500 mV VOUT VDDA – 500 mV, VDDA > 2.7 V 25 – – mA VSSA + 500 mV Vout VDDA – 500 mV, 1.7 V = VDDA 2.7 V 16 – – mA Power mode = min – 200 270 µA Power mode = low – 250 400 µA Power mode = med – 330 950 µA Power mode = high – 1000 2500 µA 80 – – dB VDDA ³ 2.7 V 85 – – dB VDDA £ 2.7 V 70 - - IOUT IDD Output current, source or sink Quiescent current CMRR Common mode rejection ratio PSRR Power supply rejection ratio 1. The values are for TA = 25 °C, VDDA = 5.0 V, Power = High, output referenced to analog ground, VSSA except where noted. Page 10 of 17 Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) Figures Histogram Input Offset Voltage T = 25 ° C, VDDA = 5.0 V Opamp Operating Current versus VDDA, and Power Mode 600 No. of Opamps 500 400 300 200 100 0.5 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 0 mV Operating Current versus Temperature, VDD = 5.0 V Operating Current versus Voltage T = 25 °C 1200 1200 1000 uA 800 1000 High uA 600 600 Medium 400 Medium 400 200 0 -60 High 800 Low , LPOC -40 -20 0 20 40 Temp degC Document Number: 001-84986 Rev. ** 60 80 200 100 120 Low , LPOC 0 0 1 2 Vdda 3 V 4 5 6 Page 11 of 17 ® Operational Amplifier (Opamp) PSoC Creator™ Component Datasheet 0.6 0.4 0.4 V 0.6 SINK 0.2 Diff from Vdda,Vss Output Voltage versus Load Current, VDDA = 5.0 V, Power = High -40 30 100 -40 30 100 0 -0.2 SOURCE Diff from Vdda -0.4 Diff from Vdda, Vss V Output Voltage versus Load Current, VDDA = 1.71 V, Power = High 0 5 10 15 I Load mA 20 25 10 15 I Load mA 20 25 30 0.2 V 0.1 0 -0.1 SINK 0 -0.1 SOURCE Diff from Vdda -0.2 Diff from Vdda, Vss V Diff from Vdda, Vss 5 Output Voltage versus Load Current VDDA = 5.0 V, Power = Medium SINK 0.1 -40 30 100 -40 30 100 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 SOURCE Diff from Vdda -0.2 -0.3 -40C 30C 100C -40C 30C 100C -0.4 -0.5 -0.6 -0.7 -0.8 0 0.5 1 I Load mA 1.5 2 Output Voltage versus Load Current, VDDA = 2.7 V, Power = Low 0 0.5 1 I Load mA 1.5 2 Output Voltage versus Load Current, VDDA = 5.0 V, Power = Low 0.4 0.4 -40 30 100 -40 30 100 SINK V 0.2 0 SOURCE Diff from Vdda -0.3 -0.4 0.00 Page 12 of 17 0.05 I Load mA 0.10 -40 30 100 -40 30 100 0.3 Diff from Vdda, Vss V 0.3 Diff from Vdda, Vss SOURCE Diff from Vdda -0.4 0 0.2 -0.2 -0.2 30 Output Voltage versus Load Current, VDDA = 2.7 V, Power = Med -0.1 -40 30 100 -40 30 100 0 -0.6 -0.6 0.1 SINK 0.2 0.15 0.2 0.1 SINK 0.0 -0.1 -0.2 SOURCE Diff from Vdda -0.3 -0.4 0.00 0.05 0.10 I Load 0.15 mA Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) Input Offset Voltage versus Temperature Power = High, VDDA = 5.0 V AC Characteristics Parameter GBW SR en Description Gain-bandwidth product Slew Rate Input noise density Document Number: 001-84986 Rev. ** Conditions Min Typ Max Units Power mode = minimum, 100 mV pk-pk, 15-pF load 1 5.4 – MHz Power mode = low, 100 mV pk-pk, 15-pF load 2 5.1 – MHz Power mode = medium, 100 mV pk-pk, 15-pF load 1 3.5 – MHz Power mode = high, 100 mV pk-pk, 200-pF load 3 8 – MHz Power mode = low, 15-pF load 1.1 2.4 – V/µs Power mode = medium, 15-pF load 0.9 1.4 – V/µs Power mode = high, 200-pF load 3 4.3 – V/µs Power mode = high, VDDA = 5 V, at 100 kHz – 45 – nV/sqrtHz Page 13 of 17 ® Operational Amplifier (Opamp) PSoC Creator™ Component Datasheet Figures Input Voltage Noise Density T = 25 °C, VDDA = 5.0 V, Power = high 1000 nV/rtHz 100 10 0.01 0.1 1 kHz 10 100 1000 DC and AC Electrical Characteristics for PSoC 5 Specifications are valid for –40 °C £ TA £ 85 °C and TJ £ 100 °C, except where noted. Specifications are valid for 1.71 V to 5.5 V, except where noted. DC Characteristics Parameter Description VI Input voltage range VOS Input offset voltage Conditions Min Typ Max Units VSSA – VDDA V Operating temperature > 70 °C – – 3 mV Operating temperature –40 °C to 70 °C – – 2 mV – ±12 ±30 µV/°C TCVos Input offset voltage drift with temperature Ge1 Gain error, unity gain buffer mode RLOAD = 1 k – – ±0.1 % CIN Input capacitance Routing from pin – – 18 pF VO Output voltage range 1 mA, source or sink VSSA + 0.05 – VDDA – 0.05 V IOUT Output current, source or sink VSSA + 500 mV Vout VDDA – 500 mV 10 – – mA IDD Quiescent current VSSA + 50 mV VOUT VDDA – 500 mV – 1 2.5 mA Page 14 of 17 Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Parameter Description Operational Amplifier (Opamp) Conditions Min Typ Max Units CMRR Common mode rejection ratio 80 – – dB PSRR Power supply rejection ratio 75 – – dB AC Characteristics Parameter Description Conditions Min Typ Max Units GBW Gain-bandwidth product 200 pF load 3 – – MHz SR Slew Rate 200 pF load 3 – – V/µs en Input noise density VDDA = 5 V, at 100 kHz – 45 – nV/sqrtHz Document Number: 001-84986 Rev. ** Page 15 of 17 ® Operational Amplifier (Opamp) PSoC Creator™ Component Datasheet Component Changes This section lists the major changes in the component from the previous version. Version Description of Changes 1.90 Added MISRA Compliance section. 1.80 Added PSoC 5LP support. Reason for Changes / Impact The component does not have any specific deviations. Added all APIs with the CYREENTRANT keyword when they are included in the .cyre file. Not all APIs are truly reentrant. Comments in the component API source files indicate which functions are candidates. Input offset voltage vs Temperature graph updated in the datasheet to include x and y axis labels. Labels needs to be added to the axes. Minor datasheet edits. Improve readability. 1.70.a Added PSoC 5 DC and AC characteristics 1.70 Removed Low Power mode DRC error for PSoC 3 Production This change is required to eliminate compiler warnings for functions that are not reentrant used in a safe way: protected from concurrent calls by flags or Critical Sections. Low power mode is supported in PSoC 3 Production Implemented DRC error to allow Only High Power mode is supported in PSoC 5 only High Power mode for PSoC 5 Edited Opamp_SetPower() API to allow only High Power mode for PSoC 5 1.60 Debug window support added New feature added Added a GUI Configuration Editor For easier use a GUI has been added to set the two parameters from a drop down Added characterization data to datasheet Minor datasheet edits and updates 1.50 Added Sleep/Wakeup and Init/Enable APIs. Page 16 of 17 To support low power modes, as well as to provide common interfaces to separate control of initialization and enabling of most components. Document Number: 001-84986 Rev. ** ® PSoC Creator™ Component Datasheet Operational Amplifier (Opamp) © Cypress Semiconductor Corporation, 2012. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in lifesupport systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. PSoC® is a registered trademark, and PSoC Creator™ and Programmable System-on-Chip™ are trademarks of Cypress Semiconductor Corp. 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Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in lifesupport systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. Use may be limited by and subject to the applicable Cypress software license agreement. Document Number: 001-84986 Rev. ** Page 17 of 17