SPI FRAM MB85RS4 Schematic запрос

radarengineer

Create a top-level schematic for a wearable stress-monitoring device.

Use modules / blocks for:

Power
Respiration AFE
ADC
MCU
Light sensor
Temperature sensor
microSD logging

Project scope:

Consumer wearable for context-aware stress monitoring
Physiological sensing: respiration (primary), motion/body position
Environmental sensing: ambient light and temperature
Logging to microSD
Future BLE is allowed, but do not add extra sensors in this revision

Required parts / modules:

MCU: Seeed XIAO nRF52840 Sense
ADC: ADS1115
Light sensor: BH1750
Temperature sensor: MCP9808
Logging: microSD BFF for XIAO
Battery: 3.7V LiPo
Motion/body position uses the XIAO’s onboard IMU
Piezo respiration sensor: TE 1-1004696-0
Respiration analog front end will be a separate module named RESP_AFE_HIFI

Top-level connection intent:

Use the XIAO as the main controller
Put ADS1115, BH1750, and MCP9808 on the I2C bus
Put microSD BFF on the SPI bus
Use a filtered analog 3.3V rail for ADS1115 + RESP_AFE_HIFI
Connect RESP_AFE_HIFI output to ADS1115 AIN0
Connect RESP_AFE_HIFI reference / VBIAS to ADS1115 AIN1
Use differential ADC measurement for respiration
Keep schematic readable with named nets and modules
Do not add heart-rate or sound sensors in this revision

What I want you to do:

Find or suggest suitable library parts for the listed modules
Build the top-level schematic with readable modules and named nets
Use the attached datasheets as the source of pin mapping when needed
Ask me before making any ambiguous substitutions
Do not design the internal respiration AFE yet; leave it as RESP_AFE_HIFI

8 days

flux

1:36

Planning response to user inquiry.

Considering project setup options.

Deciding on project details.

Thinking deeply about your request.

Considering plan tool context.

Working on your request.

Creating a concise plan.

Your wearable stress-monitoring top-level schematic plan is ready. I’ll use the attached datasheets as the pin-mapping source of truth, which is the right workflow for attachment-driven design work and matches the rule to never guess pin assignments .

This page is read-only, so start it in a new editable project here: Create new project
After it opens, click Start on the plan bar.

Plan

#Goal

Design a wearable stress-monitoring device as a new top-level schematic project using Seeed XIAO nRF52840 Sense as the MCU. The schematic will include module blocks for power, a placeholder respiration AFE (RESP_AFE_HIFI), ADS1115 ADC, microSD logging (via a microSD BFF for XIAO on SPI), light sensor (BH1750), temperature sensor (MCP9808), and additional modules including the onboard IMU and a TE 1-1004696-0 piezo respiration sensor. ADS1115 will be used for differential measurement with its AIN0 connected to RESP_AFE_HIFI output and AIN1 connected to the RESP_AFE_HIFI reference/VBIAS. BH1750, MCP9808, and ADS1115 are to be connected on I2C, while the microSD module is to be connected on SPI. A filtered analog 3.3V rail is to be used to power ADS1115 and RESP_AFE_HIFI.

#Implementation plan

Create a new editable design project dedicated to the wearable stress-monitoring device.
1. Capture the system requirements and update the project description with the device functional goals.
Add and place major modules:
1. Add Seeed XIAO nRF52840 Sense as the MCU (using the attached datasheet for pin mapping).
2. Add ADS1115 ADC, BH1750 light sensor, MCP9808 temperature sensor, microSD BFF for XIAO, and the TE 1-1004696-0 piezo respiration sensor from the parts library.
3. Add a placeholder block labeled RESP_AFE_HIFI for the respiration analog front end.
Connect modules as per system requirements:
1. Connect ADS1115, BH1750, and MCP9808 on the I²C bus using named nets.
2. Connect the microSD BFF on the SPI bus using named nets.
3. Create a filtered analog 3.3V rail for powering the ADS1115 and RESP_AFE_HIFI modules.
4. Connect RESP_AFE_HIFI output to the ADS1115 AIN0 and its reference/VBIAS to the ADS1115 AIN1 to configure differential ADC measurement.
Clearly label all nets and modules to ensure readability and traceability in the schematic.
Verify that the design does not include any heart-rate or sound sensors and that any ambiguous substitutions are verified with the user before proceeding.

#Success criteria

A top-level schematic with all required module blocks is created as a new design project.
All I2C and SPI connections are properly routed between the designated modules with named nets.
Differential ADC measurement connections (AIN0 and AIN1) are correctly defined with RESP_AFE_HIFI.
The power module provides filtered analog 3.3V to ADS1115 and RESP_AFE_HIFI, and all components use datasheet-driven pin mapping.
The design is structured for readability and further development of the internal respiration AFE as needed.

Use generic RESP_AFE block

Keep I2C at 3.3V

Name key top nets

8 days

explain this project.

lvangelis

@copilot explain this project.

copilot

This project involves the Seeed Studio XIAO nRF52840 Sense board, a device that combines the nRF52840 microcontroller and some sensors, along with Bluetooth 5.0 wireless capability; it is primarily designed for low-power applications like Internet of Things (IoT) and embedded Machine Learning.

As per the information provided, it appears that there are no nets currently in this project - it's a list of the board's pin designator names along with their corresponding pin numbers:

P0.02_A0_D0 (Pin Number: 1)
P0.03_A1_D1 (Pin Number: 2)
P0.28_A2_D2 (Pin Number: 3)
P0.29_A3_D3 (Pin Number: 4)
P0.04_SDA_A4_D4 (Pin Number: 5)
P0.05_SCL_A5_D5 (Pin Number: 6)
P1.11_TX_D6 (Pin Number: 7)
D7_RX_P1.12 (Pin Number: 8)
D8_SCK_P1.13 (Pin Number: 9)
D9_MISO_P1.14 (Pin Number: 10)
D10_MOSI_P1.15 (Pin Number: 11)
3V3 (Power source; 3.3V - Pin Number: 12)
GND (Ground reference - Pin Number: 13)
5V (Power source; 5V - Pin Number: 14)

Given that structuring of the nodes' naming implies these pins might be variously configured as digital input/output, analog input, SPI (Serial Peripheral Interface), and I2C (Inter-Integrated Circuit) data and clock pins.

Based on this information, this project seems to be in the preliminary stages, with no circuits connected to the board yet. Should you plan to design connections, consider refering to these pin designator names for specificity.

lvangelis

can you add the LDC1312 component with the SD pin on pin number 2 and the Interrupt on pin number 1?

copilot

For adding the LDC1312 Inductive Touch Sensor to the project, you would first add the component to your design and set up the part properties accordingly.

After that, you would need to connect it to the XIAO nRF52840 Sense board. Unfortunately, the current pinout of the XIAO nRF52840 Sense board does not clearly define an interrupt or SD pin. However, if we treat digital pins as general-purpose, the pins can likely be assigned as per your need.

You can try the following steps:

Connect the SD (Shutdown Pin) of the LDC1312 to the P0.03_A1_D1 (Pin number 2 of XIAO).
Connect the Interrupt pin of the LDC1312 to the P0.02_A0_D0 (Pin number 1 of XIAO).

For a precise and successful design, it's recommended to verify the pin configurations based on both LDC1312 and XIAO nRF52840 datasheets as well as your application requirements.

Note: Make sure that the voltage levels match between the components to prevent damage - you might need to use a level shifter if necessary.

Someone is typing...

please explain what 3V3 does.

taffy.white632224

@copilot please explain what 3V3 does.

Someone is typing...

create a high level mermaid block diagram of this project. Include key component...

alexrandall

@copilot create a high level mermaid block diagram of this project. Include key component's manufacturer part number in each block whenever possible.

copilot

Here's a high-level mermaid block diagram for your project. This schematic includes the key components of the Seeed Studio XIAO nRF52840 Sense module with the manufacturer part number mentioned in the block.

graph TD;
    A[Seeed Studio XIAO nRF52840 Sense\nPart Number: 102010469]
    B[Bluetooth 5.0 Capability]
    C[Onboard IMU]
    D[PDM]
    E[A0-D0\nP0.02_A0_D0]
    F[A1-D1\nP0.03_A1_D1]
    G[A2-D2\nP0.28_A2_D2]
    H[A3-D3\nP0.29_A3_D3]
    I["A4-D4 (SDA)\nP0.04_SDA_A4_D4"]
    J["A5-D5 (SCL)\nP0.05_SCL_A5_D5"]
    K[TX\nP1.11_TX_D6]
    L[RX\nD7_RX_P1.12]
    M[SCK\nD8_SCK_P1.13]
    N[MISO\nD9_MISO_P1.14]
    O[MOSI\nD10_MOSI_P1.15]
    P[3V3\n3V3]
    Q[GND\nGND]
    R[5V\n5V]

    A --> B
    A --> C
    A --> D
    A --> E
    A --> F
    A --> G
    A --> H
    A --> I
    A --> J
    A --> K
    A --> L
    A --> M
    A --> N
    A --> O
    A --> P
    A --> Q
    A --> R

This diagram provides a simplified view of your project, showing the internal components and their connections. Let me know if there's anything else you'd like to add or modify!

Someone is typing...

create a detailed step by step plan table for P0.02\_A0\_D0 to verify its functi...

darcey_pink437329

@copilot create a detailed step by step plan table for P0.02_A0_D0 to verify its functionality.

Someone is typing...

How to access solder points for XIAO on back of board for battery

tpboyce

How to access solder points for XIAO on back of board for battery

Someone is typing...

D9_MISO_P1.14

P1.11_TX_D6

P0.29_A3_D3

D8_SCK_P1.13

P0.04_SDA_A4_D4

D7_RX_P1.12

P0.05_SCL_A5_D5

3V3

P0.28_A2_D2

P0.03_A1_D1

P0.02_A0_D0

GND

D10_MOSI_P1.15

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Project Name

Seeed Studio XIAO nRF52840 Sense

Description

Seeed Studio XIAO nRF52840 Sense is carrying Bluetooth 5.0 wireless capability and is able to operate with low power consumption. Featuring onboard IMU and PDM, it can be your best tool for embedded Machine Learning projects. #SeeedStudio #xiao

Properties

Part Type

Microcontroller

Manufac… Number

102010469

Manufac…er Name

seeed studio

Datasheet URL

files.seeedstudio.com/wiki/XIAO-BLE/nRF52840_PS_v1.5.pdf

Purchase Url

seeedstudio.com/Seeed-XIAO-BLE-Sense-nRF52840-p-5253.html

Designator Prefix

Pricing & Availability

Distributor	Qty 1

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