gc

-- [[EYGC4-dat]] pins

-- [[]]

-# EYGC4-dat

-

-EYGC40 is a low-power Bluetooth (BLE) module based on a cost-effective System-on-Chip (SoC). It supports Bluetooth 4.0.

-

-## Overview

-

-- Voltage range: 2.0 V to 3.6 V (typical 3.3 V)

-- Frequency range: 2402 MHz to 2480 MHz (programmable)

-- Modulation: GFSK

-- Data rate: 1 Mbps

-- Operating temperature: -30 °C to 85 °C

-- Dimensions: 18.8 mm × 15.1 mm

-- Antenna impedance: 50 Ω

-- Antenna: PCB antenna (on-board)

-

-## Applications

-

-- 2.4 GHz low-power Bluetooth systems

-- Mobile phone accessories

-- Sports and leisure equipment

-- Consumer electronics

-- Human-computer interaction devices (keyboard, mouse, remote)

-- USB transceiver dongles

-- Healthcare and medical devices

-

-## Electrical and RF Specifications

-

-| Parameter | Value |

-|---|---:|

-| Supply voltage | 2.0 V – 3.6 V (typical 3.3 V) |

-| Operating frequency | 2402 MHz – 2480 MHz (programmable) |

-| Frequency accuracy | ±20 ppm |

-| Modulation | GFSK |

-| Data rate | 1 Mbps |

-| Max TX power | 7.9 dBm (programmable) |

-| RX sensitivity | -94 dBm |

-| Sleep current | 8 μA |

-| RX current | 12 mA |

-| TX current | 20 mA (at 7.9 dBm) |

-| Typical range | 100 m (open space) |

-| Operating temperature | -30 °C – 85 °C |

-| Size | 18.8 mm × 15.1 mm |

-

-## Pin Definitions

-

-| No. | Pin | Type | Description |

-|---:|---|---|---|

-| 1 | VCC | Power | Power input, 2.0 V – 3.6 V (typ. 3.3 V) |

-| 2 | GND | Ground | Connect to GND |

-| 3 | UART_RX | Digital I/O | UART receive |

-| 4 | UART_TX | Digital I/O | UART transmit |

-| 5 | OUTPUT_IND | Digital I/O | Data output indicator: outputs a 460 μs low pulse before UART data is sent |

-| 6 | CONN_IND | Digital I/O | Connection status indicator: HIGH after reset, LOW when a BLE connection is established |

-| 7 | WAKEUP | Digital I/O | WAKE pin: in low-power mode pull this low to enable UART communication (see note) |

-| 8 | GPIO0 | Digital I/O | Configurable as input or output |

-| 9 | GPIO1 | Digital I/O | Configurable as input or output |

-| 10 | GND | Ground | Connect to GND |

-| 11 | GND | Ground | Connect to GND |

-

-## Schematic

-

-

-

-

-

-

-

-

-## Indicator & Wake Behavior

-

-- After reset, the module's `CONN_IND` pin outputs a HIGH level. When a Bluetooth connection is established, `CONN_IND` goes LOW.

-- After a connection is established, when the module receives a BLE data packet, `OUTPUT_IND` will first output a 460 μs low pulse to notify the external MCU that data will be sent, and then the module transmits the data over UART.

-- In low-power mode the external MCU must pull `WAKEUP` low for at least 10 μs to wake the BLE module before sending UART data.

-

-

-## AT Commands

-

-Notes:

-- All commands and responses use ASCII.

-- Each command must end with <CR><LF> (carriage return + line feed) unless otherwise noted.

-- If a command is accepted the module responds with the appropriate reply (OK or the requested data); otherwise it responds with: ERROR<CR><LF>.

-

-1) Mode switch (command/transparent modes)

-

-- Default after power-up: transparent (data) mode. To enter command mode after power-up, send: AT+MODE=0<CR><LF>.

-

-Examples:

-- Query current mode: Send: AT+MODE<CR>

- - Response: +MODE:<para><CR><LF>

- - para = 0 (command mode) or 1 (transparent/data mode)

-- Query supported parameters: Send: AT+MODE?<CR>

- - Response: +MODE:<para><CR><LF>

- - para = 0,1

-- Set mode: Send: AT+MODE=<para><CR>

- - para = 0 or 1

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-2) Advertising (scan) enable

-

-- Default: advertising enabled.

-

-Examples:

-- Query current advertising state: Send: AT+SCAN<CR>

- - Response: +SCAN:<para><CR><LF>

- - para = 0 (advertising disabled) or 1 (advertising enabled)

-- Query supported parameters: Send: AT+SCAN?<CR>

- - Response: +SCAN:0,1<CR><LF>

- - (0 = disable advertising; 1 = enable advertising). This setting only applies when the module is not connected.

-- Set advertising state: Send: AT+SCAN=<para><CR>

- - para = 0 or 1

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-3) Connection interval (link interval)

-

-- Supported range: 10 ms to 2000 ms, in 10 ms increments. Changes take effect immediately.

-

-Examples:

-- Query current interval: Send: AT+LINKINV<CR>

- - Response: +LINKINV:<para><CR><LF> (current interval in ms)

-- Query supported parameters: Send: AT+LINKINV?<CR>

- - Response: +LINKINV:<para><CR><LF>

-- Set interval: Send: AT+LINKINV=<para><CR>

- - para = multiple of 10 (ms)

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-4) UART baud rate

-

-- Default: 9600, 8N1.

-- Supported baud rates: 9600, 19200, 38400, 57600, 115200.

-

-Examples:

-- Query current baud: Send: AT+UART<CR>

- - Response: +UART:<para><CR><LF> (current baud)

-- Query supported rates: Send: AT+UART?<CR>

- - Response: +UART:<para><CR><LF>

-- Set baud: Send: AT+UART=<para><CR>

- - para = 9600,19200,38400,57600,115200

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-5) TX power configuration

-

-- Ten levels available:

-

-| Level | TX Power (dBm) |

-|---:|---:|

-| 0 | -19.5 dBm |

-| 1 | -16.0 dBm |

-| 2 | -13.3 dBm |

-| 3 | -9.6 dBm |

-| 4 | -5.0 dBm |

-| 5 | -3.1 dBm |

-| 6 | 0.0 dBm |

-| 7 | 3.3 dBm |

-| 8 | 6.3 dBm |

-| 9 | 7.9 dBm (default) |

-

-Examples:

-- Query current power: Send: AT+RFPW<CR>

- - Response: +RFPW:<para><CR><LF>

-- Query supported values: Send: AT+RFPW?<CR>

- - Response: +RFPW:<para><CR><LF>

-- Set power level: Send: AT+RFPW=<para><CR>

- - para = 0..9

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-6) Module name

-

-- Default name: GCBT40. Maximum length: 18 bytes. Changes take effect after reboot.

-

-Examples:

-- Query name: Send: AT+NAME<CR>

- - Response: +NAME:<para><CR><LF>

-- Set name: Send: AT+NAME=<para><CR>

- - para = new name (up to 18 bytes)

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-7) Advertising interval

-

-- Supported values: 100, 200, 500, 1000, 2000 (ms). Range: 100 ms to 2000 ms. Changes while advertising take effect immediately.

-

-Examples:

-- Query current advertising interval: Send: AT+ADVT<CR>

- - Response: +ADVT:<para><CR><LF>

-- Query supported values: Send: AT+ADVT?<CR>

- - Response: +ADVT:<para><CR><LF>

-- Set advertising interval: Send: AT+ADVT=<para><CR>

- - para = 100,200,500,1000,2000

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-8) Query MAC address

-

-- Send: AT+GMAC<CR>

- - Response: +GMAC:<para><CR><LF> (MAC address)

-

-9) Low-power (standby) modes

-

-- Default: normal mode.

-

-Examples:

-- Query standby mode: Send: AT+STBY<CR>

- - Response: +MODE:<para><CR><LF>

- - 0 = normal mode

- - 1 = low-power mode

-- Query supported parameters: Send: AT+STBY?<CR>

- - Response: +MODE:<para><CR><LF> (para = 0,1,2)

-- Set standby mode: Send: AT+STBY=<para><CR>

- - para = 0,1,2

- - Mode 2 = deep sleep: after wake the module auto-resets and mode returns to the previous 0 or 1

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-10) RF test (single-carrier transmit)

-

-- Send: AT+TEST=P,C<CR>

- - P = TX power level (0..9)

- - C = channel index; frequency = 2402 + C*2 MHz

- - OK<CR><LF> on success; ERROR<CR><LF> on failure

-

-11) Restore factory defaults

-

-- Send: AT+DEFA<CR>

- - Response: OK<CR><LF>

- - The module will automatically reboot after this command

-

-

-## BLE Services and Characteristics (Commands)

-

-Below is a concise, developer-friendly summary of the module's BLE services and characteristics. All UUIDs are 16-bit.

-

-### 1. Data Services (Service UUID: 0xFF10)

-

-| Characteristic | UUID | Properties | Length | Function |

-|---|---:|---|---:|---|

-| Bluetooth data channel | 0xFF11 | Write | 20 bytes | Data written here is forwarded to the UART output |

-| UART data channel | 0xFF12 | Notify | 20 bytes | Data from UART is sent to the connected mobile device via notifications |

-

-### 2. Configuration Service (Service UUID: 0xFF20)

-

-| Characteristic | UUID | Properties | Function / Notes |

-|---|---:|---|---|

-| Connection interval config | 0xFF21 | Write | Configure connection interval; supported in multiples of 10 ms. Write the corresponding value to set. On success the status channel returns OK; otherwise ERROR. Query: send '=' to read current config (reply via status channel). Send '?' to query supported values. |

-| Rename module | 0xFF22 | Write | Set module name (max 18 characters). Reboot required to apply. |

-| UART baud rate config | 0xFF23 | Write | Supported baud rates: 9600, 19200, 38400, 57600, 115200. Query: send '=' to read current value; send '?' to read supported values. |

-| TX power config | 0xFF24 | Write | Power levels 0–9 (see table below). Default is level 9 (7.9 dBm). Query: '=' current, '?' supported. |

-| Low-power mode enable | 0xFF25 | Write | 0 = normal mode, 1 = low-power mode. Query supported values with '?'. |

-| Advertising/connection interval | 0xFF26 | Write | Supports multiples of 10 ms. Write value to set. Query: '=' current, '?' supported. |

-| Status reply (operation result) | 0xFF2F | Notify | Returns status for configuration operations. Query replies return the requested data; config operations return OK or ERROR. |

-

-TX power levels mapping (level -> dBm):

-

-| Level | TX Power (dBm) |

-|---:|---:|

-| 0 | -19.5 dBm |

-| 1 | -16.0 dBm |

-| 2 | -13.3 dBm |

-| 3 | -9.6 dBm |

-| 4 | -5.0 dBm |

-| 5 | -3.1 dBm |

-| 6 | 0.0 dBm |

-| 7 | 3.3 dBm |

-| 8 | 6.3 dBm |

-| 9 | 7.9 dBm (default) |

-

-### 3. GPIO Control Service (Service UUID: 0xFF50)

-

-| Characteristic | UUID | Properties | Function |

-|---|---:|---|---|

-| GPIO0 output control | 0xFF51 | Write | Write 0 or 1 to set GPIO0 output |

-| GPIO0 mode control | 0xFF52 | Write | 0 = input mode, 1 = output mode |

-| GPIO0 status | 0xFF53 | Read | Read GPIO0 state: 0 = low, 1 = high |

-| GPIO1 output control | 0xFF54 | Write | Write 0 or 1 to set GPIO1 output |

-| GPIO1 mode control | 0xFF55 | Write | 0 = input mode, 1 = output mode |

-| GPIO1 status | 0xFF56 | Read | Read GPIO1 state: 0 = low, 1 = high |

-| Data storage | 0xFF58 | Read/Write | Read or write up to 18 bytes for persistent storage (retained after power loss) |

-| GPIO status notification | 0xFF5F | Notify | Notifies external device of GPIO status changes |

-

-## 4. Device Information Service (Service UUID: 0x180A)

-

-| Characteristic | UUID | Properties | Length | Default / Notes |

-|---|---:|---|---:|---|

-| Module MAC address | 0x2A23 | Read | 8 bytes | Default: 0000xxxxxxxxxxxx (hex); physical address of the module |

-| Module model | 0x2A24 | Read | 15 bytes | Default: EYGC40 |

-| Software version | 0x2A28 | Read | 4 bytes | Software/firmware version |

-| Manufacturer | 0x2A29 | Read | 10 bytes | Default: "BLE Module" |

-

-

-## Notes and Usage Tips

-

-- Use the `OUTPUT_IND` pulse to synchronize reads from UART if the host MCU sleeps or polls.

-- Before sending UART data while the module is in low-power mode, pull `WAKEUP` low for at least 10 μs.

-- After changing configuration values that require a reboot (for example the module name), cycle power or issue a software reboot to apply changes.