Description
TTGO T-call is a modified ESP32 (ESP-WROVER-B 8MB PSRAM) development board with an integrated SIM800L 2G/GPRS module. The USB Type C pluggable board includes an integrated LiPo Battery Charging Circuit & Connector and is an excellent solution for developing IoT applications. Aside from Wi-Fi and Bluetooth, you may use GSM/GPRS technology to communicate with this development board, and you can connect it to the internet using your SIM card data plan. This is ideal for IoT applications without access to a local router. The TTGO T-call kit comprises header pins, a battery connector, and an external PCB antenna that may be connected to your board.
Specifications
| Chipset | ESPRESSIF-ESP32 240MHz Xtensa® dual-core 32-bit LX6 microprocessor |
| FLASH | QSPI flash 4MB / PSRAM 8MB |
| SRAM | 520 kB SRAM |
| Button | Reset |
| USB to TTL | CP2104 |
| Modular interface | UART, SPI, SDIO, I2C, LED PWM, TV PWM, I2S, IRGPIO, capacitor touch sensor, ADC, DACLNA pre-amplifier |
| On-board clock | 40MHz crystal oscillator |
| Working voltage | 2.7V-3.6V |
| Working current | About 70mA |
| Sleep current | About 300uA |
| SIM card | Only supports Nano SIM card |
| Working temperature range | -40℃ ~ +85℃ |
| Size&Weight | 78.83mm*28.92mm*8.06mm(11.77g) |
| Power Supply Specifications | |
| Power Supply | USB 5V/1A |
| Charging current | 500mA |
| Battery | 3.7V lithium battery |
| JST Connector | 2Pin 1.25mm |
| USB | Type-C |
| Wi-Fi | |
| Standard | FCC/CE-RED/IC/TELEC/KCC/SRRC/NCC |
| Protocol |
802.11 b/g/n(802.11n, speed up to150Mbps)A-MPDU and A-MSDU polymerisation, support 0.4μS Protection interval
|
| Frequency range | 2.4GHz~2.5GHz(2400M~2483.5M) |
| Transmit Power | 22dBm |
| Communication distance | 300m |
| Bluetooth | |
| Protocol | meet Bluetooth v4.2BR/EDR and BLE standard |
| Radiofrequency | with -97dBm sensitivity NZIF receiver Class-1,Class-2&Class-3 emitter AFH |
| Audio frequency | CVSD&SBC audio frequency |
| Software specification | |
| Wi-Fi Mode | Station/SoftAP/SoftAP+Station/P2P |
| Security mechanism | WPA/WPA2/WPA2-Enterprise/WPS |
| Encryption Type | AES/RSA/ECC/SHA |
| Firmware upgrade | UART download/OTA(Through network/host to download and write firmware) |
| Software Development | Support cloud server development /SDK for user firmware development |
| Networking protocol | IPv4, IPv6, SSL, TCP/UDP/HTTP/FTP/MQTT |
| User Configuration | AT + Instruction set, cloud server, android/iOSapp |
| OS | FreeRTOS |
| Country of Origin | China |