Severson-Group · noguchi-takahiro · Jan 22, 2022 · Jan 24, 2022 · Feb 10, 2023 · Feb 10, 2023
@@ -0,0 +1,22 @@
+Comment,Designator,Supplier Part Number 1,Supplier order Quantity
+BNC,BNC1,A33798-ND,1
+C0603C104Z3VACTU,"C1, C2, C3, C4, C9",399-1100-1-ND,5
+GRM1885C1H102JA01D,C5,490-1451-1-ND,1
+Capacitor,"C6, C7, C8, C10, C11",1276-2890-1-ND,5
+LTST-C193KGKT-5A,DS1,160-1828-1-ND,1
+LTST-C193TBKT-5A,DS2,160-1827-1-ND,1
+742792609,"L1, L2, L3, L4",732-1591-1-ND,4
+HDR1x3,P1,A98334-ND,1
+HDR1X7,P2,A32908-ND,1
+HDR1x3,P3,A106650-ND,1
+Screw terminal,"P5, P6",36-8196-ND,2
+ERJ-3GEYJ302V,"R1, R3",P3.0KGCT-ND,2
+RC0603FR-07470RL,R2,311-470HRCT-ND,1
+ERA3AEB103V,R4,P10KDBCT-ND,1
+Burden resistor,R5,RK73H3ATTE28R0F,1
+ERA3AEB1072V,R6,P10.7KDBCT-ND,1
+ERA3AEB4121V,R8,P4.12KDBCT-ND,1
+5004,"TP1, TP2, TP3, TP4, TP5, TP6, TP7",36-5004-ND,7
+ADC,U1,296-47183-ND,1
+OPA320AIDBVR,U2,296-29480-1-ND,1
+REF5045IDGKT,U3,296-24505-1-ND,1
@@ -13,7 +13,7 @@ REV C
 
 The current measurement card was designed to the following specifications:
 
-1. Current measurement range of +/- 55A (rms)
+1. Current measurement range of +/- 55A or +/- 150A (rms)
 2. Noise immunity
 3. Quick adjustment of the sensing range
 4. High sensor bandwidth
@@ -25,13 +25,13 @@ The high level block diagram of the current sensor card is shown below:
 <img src="images/current-sensor-blockdiagram.svg" width="500%" />
 
 ### Current Sensor
-LEM LA 55-P current sensor is selected for this design, as it is the only sensor available from LEM with an open aperture and PC pins that can measure +/-55A. 
+LEM LA 55-P or LA 100-P current sensors are selected and can be used for this design based on the sensing range desired. They are available from LEM with an open aperture and PC pins. LEM LA 55-P and LA 100-P can measure +/-55A and +/-150A, respectively. Note that the LA100 series also has these variants, LA100-P/SP13 and LA100-TP, which have different gains that users must be careful about when ordering.
 The open aperture was a requirement as it allows for the range to be easily scaled down just by adding turns to the primary. 
-The LA 55-P is a closed loop compensated hall effect transducer that has an accuracy of +/-0.65% and linearity of <0.15% which is quite good compared to other sensors from LEM. 
-It has an excellent bandwidth of 200khz and a low impedance current output that is inherently more immune to noise than a high impedance voltage output. 
+The LA 55-P is a closed loop compensated hall effect transducers that has an accuracy of +/-0.65% and linearity of <0.15% which is quite good compared to other sensors from LEM. The LA 100-P has an accuracy of +/-0.45% and linearity of <0.15%.
+They have an excellent bandwidth of 200khz and a low impedance current output that is inherently more immune to noise than a high impedance voltage output. 
 
 
-### Burden Resistor (_R_<sub>_BURDEN_</sub>)
+### Burden Resistor (_R_<sub>_BURDEN_</sub>) for LA 55-P
 A burden resistor (`R5`) is used to convert the current output of the sensor to a voltage. For a sensing range of 70A, the burden resistance, _R_<sub>_BURDEN_</sub> was calculated using the following equation
 
 _V_<sub>_BURDEN_</sub>  = _I_<sub>_PRIMARY_</sub>(_N_<sub>2</sub>/_N_<sub>1</sub>)_R_<sub>_BURDEN_</sub>
@@ -40,10 +40,19 @@ _R_<sub>_BURDEN_</sub>  = (10 V/70 A)*(1000/1) = 143Ω
 
 The LA 55-P datasheet specifies the burden resistor value must be between 135Ω and 155Ω so a 150Ω resistor was selected.
 
-### Current Sensor Gain
-The LA 55P has a conversion ratio of _N_<sub>1</sub>:_N_<sub>2</sub> = 1:1000, where _N_<sub>1</sub> is the primary turns (user configurable) and _N_<sub>2</sub> is the secondary turns. With the chosen _R_<sub>_BURDEN_</sub> and _N_<sub>1</sub> = 1, the current sense circuitry has a current - voltage gain of 1/7 [V/A]. 
+### Burden Resistor (_R_<sub>_BURDEN_</sub>) for LA 100-P
+For a sensing range of 150A, the burden resistance, _R_<sub>_BURDEN_</sub> was calculated using the following equation
+
+_R_<sub>_BURDEN_</sub>  = (2 V/150 A)*(2000/1) = 26.7Ω 
+
+The LA 100-P datasheet specifies the burden resistor value must be between 0Ω and 33Ω so a 28Ω resistor was selected.
+
+### Current Sensor Gain for LA 55-P
+The LA 55-P has a conversion ratio of _N_<sub>1</sub>:_N_<sub>2</sub> = 1:1000, where _N_<sub>1</sub> is the primary turns (user configurable) and _N_<sub>2</sub> is the secondary turns. With the chosen _R_<sub>_BURDEN_</sub> and _N_<sub>1</sub> = 1, the current sense circuitry has a current - voltage gain of 0.15 [V/A]. 
 To sense lower current, multiple number of primary turns can be added, without the need to modify any other parts of the circuit. As an example, to sense currents in the range of +/- 7 A, _N_<sub>1</sub> = 10 can be used, without modifying rest of the circuit.
 
+### Current Sensor Gain for LA 100-P
+The LA 100-P has a conversion ratio of _N_<sub>1</sub>:_N_<sub>2</sub> = 1:2000. With the chosen _R_<sub>_BURDEN_</sub> and _N_<sub>1</sub> = 1, the current sense circuitry has a current - voltage gain of 0.014 [V/A]. 
 
 ### Op Amp Stage
 The voltage across the burden resistor is a bipolar signal (voltage span includes both positive and negative voltages).
@@ -91,7 +100,8 @@ A user may want to change some of the passive components based on the range requ
 
 
 ## Datasheets
-- [Current Sensor](../datasheets/LA55P_Current%20Sensor.pdf)
+- [Current Sensor (LA55-P)](../datasheets/LA55P_Current%20Sensor.pdf)
+- [Current Sensor (LA100-P)](../datasheets/LA100P_Current%20Sensor.pdf)
 - [Op Amp](../datasheets/OPA320_OpAmp.pdf)
 - [Voltage Reference (LDO)](../datasheets/REF5045_LDO.pdf)
 - [Analog to Digital Converter](../datasheets/ADS_8860_ADC.pdf)

@@ -46,3 +46,34 @@ NOTE: The STM32 devices are typically programmed into non-volatile memory. There
 The mainboard firmware is fairly simple, yet very specialized for the application. Before changing *anything* in the code, make sure you understand how it works. Practically every line of the code is optimized for speed and efficiency! Using a multi-channel logic analyzer / oscilloscope is absolutely required when updating the mainboard firmware to validate code timing.
 
 **Do not blindly change the code.**
+
+## Flashing Firmware to Mainboards with Alternative STM32F745ZG Processors
+
+The firmware project provided in this repository is configured for a mainboard populated with a STM32F**765**ZG processor. This project configuration is incompatible with the alternative STM32F**745**ZG chip that is populated on some mainboard PCBs. Creating a new project targeting the alternative STM32F**745**ZG processor and loading in the provided source files is required. Here's how that's done.
+
+### Create a new STM32 Project
+1. Within STM32CubeIDE create a new `STM32 project` targeting the `STM32F745ZG` device with the following settings:
+    - Targeted Language: `C`
+    - Targeted Binary Type: `Executable`
+    - Targeted Project Type: `STM32Cube`
+
+### Replace Source Code
+2. Open the file folder location of the newly created project 
+3. Navigate to the `\Core\` directory and replace the `\Src` & `\Inc` folders with the ones provided in the AMDS repository
+4. Navigate to the `\Drivers\STM32F7xx_HAL_Driver` directory and replace the `\Src` & `\Inc` folders with the ones provided in the AMDS repository
+5. Within STM32CubeIDE refresh & build the project, no errors should be present
+
+### Increase Compiler Optimization
+6. In the `Project Explorer` pane on the left, right-click on the STM32Cube Project you created, and click on Properties
+7. Expand `C/C++ Build` and click `Settings`
+8. Find and click on `MCU GCC Compiler` > `Optimization`
+9. Select the dropdown next for `Optimization Level` and change to `Optimize more (-O2)`
+10. Select `Apply and Close`
+
+### Flash Firmware to Mainboard
+11. Select `Debug Configurations` under the `Run` menu at the top
+12. Select the `Debugger` tab in the pop-up window
+13. Change the `Frequency (kHz)` setting from `Auto` to `140`
+14. Select `Apply` 
+
+You are now ready to connect & flash the firmware to the STM32F**745**ZG processor equiped Mainboard!