Calyx 4G / EBD021 - 4G HAT

Cellular HAT+ for compact embedded platforms

The Teltonika Calyx 4G / EBD021 adds integrated cellular connectivity to systems based on Raspberry Pi 4, Raspberry Pi 5, and Rubik Pi. Designed as a HAT+ expansion board, it enables direct mobile data integration on the host platform for embedded and technical integration projects.

Host connection and system integration

The board provides a 40-pin GPIO header and a USB Type-C interface for integration into existing hardware designs. Power can be supplied either through USB Type-C or through the 40-pin header, supporting flexible installation in compact systems where power input, data connection, and carrier board layout need to be closely aligned.

4G connectivity with GPIO-based modem control

The EBD021 variant supports 4G LTE Cat 4 and also provides fallback to 3G and 2G networks. GPIO access is available for modem PWR_KEY, wake-up, and reset functions, which is relevant for applications where modem behavior needs to be managed directly by the host system.

Built for compact and robust embedded designs

The board includes a 4FF Nano SIM slot, two SMA connectors for mobile antennas, and status LEDs for power and network indication. Its compact mechanical format and extended operating temperature range make it suitable for embedded designs that require direct, hardware-level cellular integration.

Technical Specifications

• Manufacturer: Teltonika Networks
• Product: Calyx 4G / EBD021
• Product type: Embedded Cellular Raspberry Pi HAT+
• Host platforms: Raspberry Pi 4, Raspberry Pi 5, Rubik Pi
• Cellular standards: 4G LTE-FDD Cat 4, 4G LTE-TDD Cat 4, DC-HSPA+, 3G, 2G EDGE, 2G GPRS
• Data rates: LTE-FDD up to 75 Mbps DL / 50 Mbps UL; LTE-TDD up to 65 Mbps DL / 35 Mbps UL; DC-HSPA+ up to 42 Mbps DL / 5.76 Mbps UL; 3G up to 384 kbps DL / 384 kbps UL; EDGE up to 236.8 kbps DL / 236.8 kbps UL; GPRS up to 85.6 kbps DL / 85.6 kbps UL
• 3GPP Release: Release 9
• Power supply: USB Type-C 5 VDC or via 40-pin header with 5 VDC and 3.3 VDC
• USB: USB 2.0
• GPIO: 40-pin GPIO header
• GPIO modem control: PWR_KEY, modem wakeup, modem reset
• PCM: PCM digital interface, 0 to 3.3 V logic level
• SIM: 1x Nano SIM slot (4FF), push-pull
• Antenna connectors: 2x SMA for mobile
• Status LEDs: 1x Power, NET IND, NET STAT
• Dimensions (W x H x D): 56 x 23.11 x 95.48 mm
• Weight: 57 g
• Operating temperature: -40 °C to 75 °C
• Approvals: CE, UKCA, EAC, UCRF, RCM, CB, WEEE
• Region / available version: EMEA, Thailand, Australia, New Zealand
• Supported bands: LTE-FDD B1, B3, B5, B7, B8, B20, B28; LTE-TDD B38, B40, B41; 3G B1, B8; 2G B3, B8
• Standard package: Calyx, Quick Start Guide, PCB Connector, USB Type-C to USB Type-A cable, Fasteners Kit
• HS Code: 851762
• HTS: 8517.62.00

Application Areas

• Cellular integration for Raspberry Pi and Rubik Pi based embedded systems.
• Embedded gateways and edge systems with Nano SIM based WAN connectivity.
• Industrial and automation solutions using GPIO-controlled modem logic.
• Telemetry and remote access applications with external mobile antennas.
• Compact system designs where cellular access, host connection, and power input must be combined directly on the carrier platform.
• Deployments in environments that require an extended operating temperature range.