2 layers109.2 × 91.4 mm
FunctionGeneratorCortexM4
cracked-machine/FunctionGeneratorCortexM4_HW
A function generator powered by ARM Cortex M4
88 parts2MIT
2 layers109.2 × 91.4 mm
FunctionGeneratorCortexM4
cracked-machine/FunctionGeneratorCortexM4_HW2A function generator powered by ARM Cortex M4
- Size
- 109.2 × 91.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 119
- Nets
- 107
- Pads
- 372
- Tracks, vias
- 765, 103
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 27 Feb 2020
- Updated
- 18 Jun 2021
Overview
FunctionGeneratorCortexM4 is an open-source printed circuit board by cracked-machine, from the cracked-machine/FunctionGeneratorCortexM4_HW repository on GitHub, published under the MIT licence. It is a 2-layer board of 109.2 × 91.4 mm with 119 parts on 107 nets, routed with 765 tracks and 103 vias.
It is built around the STM32G474RET6, TL072 and TPS60400DBV, with the LM1117-5.0, LP3992-33B5F and TS5A3357DCU among its other parts. Its parts include 41 capacitors, 23 resistors, 14 ICs, 6 diodes and 6 connectors. It belongs with the STM32 boards of this library.
Main components
7
STM32G474RET6
LQFP-64(10x10)-40℃~+85℃ 1.71V~3.6V 128KB 12bit 12bit 170MHz 32 Bit 512KB 52 ARM Cortex-M4F Built-in FLASH LQFP-64(10x10) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
TPS60400DBV
SOT-23-5-40℃~+85℃ 1.6V~5.5V 15Ω 270uA 60mA 90% Inverted Support SOT-23-5 Charge Pumps ROHSTexas InstrumentsCharge Pumps
LM1117-5.0
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 5V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorisedLP3992-33B5F
SOT-23-5-40℃~+125℃@(Tj) 1 130uA 3.3V 300mA 300mV@(300mA) 300uVrms 5.5V 76dB@(1kHz) Fixed Over Current Protection、Enable、Thermal Shutdown Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSLOWPOWERVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TS5A3357DCU
VSSOP-8-0.5mm-40℃~+85℃ 1 1.65V~5.5V 17pF 3.7ns 334MHz 3:1 5Ω 6.5ns VSSOP-8-0.5mm Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches / Multiplexers
DMG2301L
SOT-23-55℃~+150℃ 1 P-Channel 1.2V 1.5W 150mΩ@2.5V 20V 3A 5.5nC@4.5V P-Channel SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
README
README.mdCortex M4-based Function Generator (Hardware)
A function generator powered by STM32 G4.
Required Kicad Hardware library: https://github.com/cracked-machine/KicadLibrary
For details of the MCU configuration and firmware refer to FunctionGeneratorCortexM4_SW
Note, RevB was the final design. RevC was not built and is an untested future proposal.
System Overview
Input signals can be used as a trigger, capturing on voltage level or edge detection.
DAC1 synthesises the main output signal waveform and sends it to a voltage gain amplifier (LTC6910-3). The signal is then mixed with the DC offset signal from DAC2. The signal is then passes through a lowpass filter to remove any high frequency noise.
DAC2 is a DC signal 0-3.3V. This is sent to a buffer and inverting buffer. Either output is selected using the MCU-controlled SPDT switch IC (TS12A12511DCNR). This applies a software configurable DC offset between +3.3V and -3.3V to the main output signal.
DAC3 is an output signal synchronised to DAC1 to be used for triggering purposes.
Daughter boards
The display, controls and i/o connectors are connected via daughter boards to the main board via ribbon cable. An example of the display daughter board and its ribbon cable can be seen in the video below:
https://www.instagram.com/p/CA5NSdBhmBY/?utm_source=ig_web_copy_link
Power supply
Current Consumption:
| Component | Type | Current |
|---|---|---|
| STM32G4 | MCU | 42mA (max) |
| TL972 | OPAMP | 3.2mA (per amplifier) |
| LTC6910-3 | PGA | 4.9mA |
| TS12A12511 | SPDT | 1uA |
| 74LVC1G3157 | SPDT | 35uA |
| LCD TFT | display | 60mA |
| Total | 120mA |
The 9V input is regulated down to 3.3V and 5V for the MCU and LCD display.
Dual supply for the VGA and opamps are provided using multiple TPS60400 charge pumps. TPS60400 are rated at 60mA output but in testing was found to be less. Therefore, multiple TPS60400 were required to provide "point-of-load" regulation.
Additional filtering is provided at the MCU supply pins with L1 and L2 ferrite beads and C1-C12 bypass capacitors.
A midpoint reference 2.5V voltage is provided to the LTC6910-3 VGA using a TL431DBZ precision programmable reference.
Limitations
The power supply limits the output to 9Vp-p. The output swing of the VGA limits this further.
The VGA output current is limited to ~25mA. This is also limited by the power supply.
Due to the settling time of the VGA, smooth sweeps between output amplitude levels using this IC was not possible. As such, the output is fixed to the maximum VGA level. Output amplitude control was handled by the firmware instead.
See LTC6910-3 datasheet for more information.
Parts
119| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 100nF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C1, C5, C6, C7, C12, C16, C21, C22, C31, C33, C34, C35, C36, C37, C38, C39 +1 |
| 15 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12, TP13, TP16, TP17 |
| 9 | 1K | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R9, R10, R14, R15, R16, R17, R18, R19, R22 |
| 7 | 1nF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C15, C17, C18, C19, C20, C23, C24 |
| 6 | 10Uf | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C13, C14, C25, C27, C28, C29 |
| 6 | 1uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C2, C4, C10, C11, C30, C41 |
| 5 | 4K7 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R5, R6, R20, R23, R24 |
| 5 | LED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D2, D3, D4, D5, D6 |
| 4 | 10K | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R2, R3, R7, R12 |
| 3 | Jumper_NO_Small | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP2, JP4, JP15 |
| 3 | TPS60400 | Package_TO_SOT_SMD:SOT-23-5_HandSoldering | U4, U5, U14 |
| 2 | 10uF | Capacitor_SMD:CP_Elec_4x5.7 | C9, C26 |
| 2 | 50R | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R4, R21 |
| 2 | 600R@100MHz | Inductor_SMD:L_1206_3216Metric_Pad1.42x1.75mm_HandSolder | L1, L2 |
| 2 | Jumper_NC_Small | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP1, JP3 |
| 2 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U12, U13 |
| 1 | 100K | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R8 |
| 1 | 100R | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R11 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C40 |
| 1 | 10V | Diode_SMD:D_SOD-123F | D1 |
| 1 | 10uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C32 |
| 1 | 4.7uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C3 |
| 1 | 560R | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4 |
| 1 | Conn_02x04_Odd_Even | Connector_IDC:IDC-Header_2x04_P2.54mm_Vertical | J6 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J1 |
| 1 | Conn_02x06_Odd_Even | Connector_IDC:IDC-Header_2x06_P2.54mm_Vertical | J3 |
| 1 | Conn_02x07_Odd_Even | Connector_PinHeader_1.27mm:PinHeader_2x07_P1.27mm_Vertical_SMD | J7 |
| 1 | DMG2301L | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Jumper_NC_Small | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP10 |
| 1 | LM1117-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U8 |
| 1 | LP3992-33B5F | Package_TO_SOT_SMD:TSOT-23-5 | U3 |
| 1 | LTC6910 | Package_TO_SOT_SMD:TSOT-23-8 | U11 |
| 1 | MCP601-xOT | Package_TO_SOT_SMD:SOT-23-5 | U7 |
| 1 | NCP51460SN33T1G | Package_TO_SOT_SMD:SOT-23 | U1 |
| 1 | R_POT_TRIM | Potentiometer_SMD:Potentiometer_Bourns_3314J_Vertical | RV1 |
| 1 | STM32G474RET | Package_QFP:LQFP-64_10x10mm_P0.5mm | U6 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J2 |
| 1 | TL431DBZ | Package_TO_SOT_SMD:SOT-23 | U10 |
| 1 | TS12A12511DCNR | Package_TO_SOT_SMD:SOT-23-8_Handsoldering | U9 |
| 1 | TS5A3357 | Package_SO:VSSOP-8_2.4x2.1mm_P0.5mm | U2 |
The 115 most common of 119 parts.
Questions
How big is the FunctionGeneratorCortexM4 PCB?
It measures 109.2 × 91.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the FunctionGeneratorCortexM4 use?
119 parts, built around the STM32G474RET6, TL072, TPS60400DBV and LM1117-5.0. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the FunctionGeneratorCortexM4 KiCad files?
From the cracked-machine/FunctionGeneratorCortexM4_HW repository on GitHub, at the commit this page was made from: the board is HW/MainBoard/RevB/FunctionGeneratorCortexM4/FunctionGeneratorCortexM4.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the FunctionGeneratorCortexM4 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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