FSC-CL4040 Wi-Fi 4 + BT 4.2 + 4G LTE-M Module (ESP32 & nRF9160)


FSC-CL4040 is a highly integrated single-chip modem that combines 2.4GHz wireless LAN (WLAN) 802.11b/g/n, Bluetooth low energy (V4.2) dual-mode, and 4G embedded cellular capabilities, featuring an Arm Cortex-M33 CPU with 256 KB of RAM and 1 MB of flash. It employs a 32-bit MCU single/dual-core processor with up to 600 MIPS, a WLAN baseband with 1T1R function, RF, Bluetooth, and peripheral devices. The modem supports low-power LTE and GPS connectivity and is compatible with most global LTE-M and NB-IoT cellular networks. It includes numerous serial and analog peripherals, such as UART, SPI, I²C, PWM, and a 14-bit ADC with up to eight input channels, and offers 29 GPIO pins with flexible peripheral mapping. The FSC-CL4040 can act as a client to accept AT commands and provide responses over the serial UART, making it ideal for designers aiming to add wireless capability and expand wireless coverage in their products, with support for external antennas.


  • NRF9160 Features - Microcontroller:
    • Up to 4× SPI master/slave with EasyDMA
    • Up to 4× I²C compatible two-wire master/slave with EasyDMA
    • Up to 3× UART (CTS/RTS) with EasyDMA
    • I²S with EasyDMA
    • Digital microphone interface (PDM) with EasyDMA
    • 4× pulse width modulator (PWM) unit with EasyDMA
    • 12-bit, 200 ksps ADC with EasyDMA – eight configurable channels with programmable gain
    • 3× 32-bit timer with counter mode
    • 2× real-time counter (RTC)
    • Programmable peripheral interconnect (PPI)
    • 29 general purpose I/O pins
    • All necessary clock sources integrated
  • nRF9160 Features - LTE modem:
    • Transceiver and baseband
    • 3GPP LTE release 13 Cat-M1 and Cat-NB1 compliant
    • 3GPP release 13 coverage enhancement
    • 3GPP LTE release 14 Cat-NB2 compliant
    • GPS receiver
      • GPS L1 C/A supported
      • QZSS L1 C/A supported
    • RF transceiver for global coverage
      • Up to +23 dBm output power
      • -108 dBm sensitivity (LTE-M) for low band, -107 dBm for mid band
      • Single 50 Ω antenna interface
    • LTE band support in hardware
      • Cat-M1: B1, B2, B3, B4, B5, B8, B12, B13, B14, B18, B19, B20, B25, B26, B28, B66
      • Cat-NB1/NB2: B1, B2, B3, B4, B5, B8, B12, B13, B17, B19, B20, B25, B26, B28, B66
    • Supports SIM and eSIM with an ETSI TS 102 221 compatible UICC interface
    • Power saving features: DRX, eDRX, PSM
    • IP v4/v6 stack
    • Secure socket (TLS/DTLS) API
  • nRF9160 Features - Current consumption @ 3.3 V:
    • Power saving mode (PSM) floor current: 2.8 μA
    • eDRX @ 82.91s: 19μA in Cat-M1, 38 μA in Cat-NB1 (UICC included)
  • ESP32 Wi-Fi Features
    • 802.11b/g/n
    • 802.11n (2.4GHz) speed up to 150 Mbps
    • Wireless Multimedia (WMM)
    • Frame aggregation (TX/RX A-MPDU, RX A-MSDU)
    • Immediate Block ACK
    • Reorganization (Defragmentation)
    • Beacon automatic monitoring (hardware TSF)
    • Antenna diversity
  • ESP32 Bluetooth Features
    • Bluetooth V4.2
    • Up to +9 dBm output power
    • NZIF receiver has BLE reception sensitivity of -94 dBm
    • Adaptive Frequency Hopping (AFH)
    • Standard HCI based on SDIO/SPI/UART interface
    • CVSD and SBC audio codec algorithms
    • Bluetooth Piconet and Scatternet
    • Multi-device connection supporting traditional Bluetooth and Bluetooth low energy
    • Support simultaneous broadcast and scan
    • Support SPI/I²S/I²C/UART/PWM/Ethernet MAC/ADC interface
    • Low power consumption
    • Support standard level 1, level 2 and level 3
    • The default UART baud rate is 115.2 Kbps, which can support 1200bps to 500 Kbps
    • Support air upgrade
    • Bluetooth profile support: SPP, HID, GATT, ATT, GAP
    • Support Apple MFi (iAP2), iBeacon
  • General Features
    • Stamp module suitable for Surface Mounted Technology (SMT)
    • Iron Shielding case (Optional)
    • Dimensions (Iron Shielding Case): 22.9 mm (L) × 21.9 mm (W) × 2.0 mm (H)
    • Operating Voltage:
      • VCC: 3.0V ~ 3.6V (Peak Current 1A)
      • VCC_GPIO: 1.8V ~ 3.6V
    • RoHS / REACH Compliant
    • External Antenna


  • Sensor networks
  • Logistics and asset tracking
  • Smart energy
  • Smart building automation
  • Smart agriculture
  • Industrial applications
  • Retail and monitoring devices
  • Medical devices
  • Wearables
  • Home automation
  • Automated industry
  • Wi-Fi toys
  • POS systems


Categories Features Implementation
ESP32 Bluetooth & Wi-Fi
Wireless Specification Bluetooth Version: V4.2
Frequency: 2.412 ~ 2.484 GHz
Transmit Power: +9 dBm (Max.)
Wi-Fi 802.11b/g/n 1×1, 2.4GHz
Frequency: 2.412 ~ 2.484 GHz
Transmit Power (2.4GHz): +20.5 dBm (11b), +18 dBm (11n)
MCS0-7 supports 20MHz and 40MHz bandwidth
Adjustable transmit power
Host Interface and Peripherals UART Interface TX, RX (Auto Flow Control)
General Purpose I/O
Default 115200, N, 8, 1
Baudrate support from 1200 to 5000000 bps
7, 8 data bit character
GPIO 18 (maximum – configurable) lines
O/P drive strength (4 mA)
Pull-up resistor (45 KΩ) control
Read pin-level
I²C Interface 1 (configurable from GPIO total).
SPI Interface Support Master/Slave mode
PWM 16-bit resolution
Accurately capture external timed events
Supports PWM interrupts
Profiles Classic Bluetooth Support
Bluetooth Low Energy Support
Wi-Fi Wi-Fi-AP (access point), Wi-Fi-Station
FW upgrade   UART
Power Consumption Bluetooth Send BT/BLE, POUT = 0 dBm, power consumption is 130 mA
Receive BT/BLE, power consumption is 95 ~ 100 mA
Wi-Fi Send 802.11b, DSSS 1 Mbps, POUT = +19.5 dBm, power consumption is 240 mA
Send 802.11g, OFDM 54 Mbps, POUT = +16 dBm, power consumption is 190 mA
Send 802.11n, OFDM MCS7, POUT = +14 dBm, power consumption is 180 mA
Receive 802.11b/g/n, power consumption is 95 ~ 100 mA
nRF9160 Feature/Specification
Application Processor Peripherals   Serial Peripherals: 4× SPI, 3× UART, 4× Two Wire Interface(TWI), I²C, I²S
Analog Peripherals: PDM, PWM, 8/10/12-bit ADC with 8 input channels and 200kHz sampling rate (up to 14-bit resolution when oversampling)
Timers: 3× Timers, 2× RTC Watchdog Timers
I/O Pins   GPIO: 29× VCC_GPIO ref'd with flexible peripheral mapping
MAGPIO: 3× 1.8V ref'd GPIO for antenna tuning
COEX: 3× VCC_GPIO ref'd GPIO for Coexistence interface
Internet Protocols   Application Layer Protocols: HTTP/HTTPS, TLS/DTLS, MQTT
Transport Layer Protocols: TCP/UDP
Cellular Capabilities   Cellular Technologies: LTE-M, LTE CAT-NB1, and LTE, CAT-NB2
Internet Protocols: IPv4, IPv6
Low Power Modes: PSM, eDRX
Operating Frequency Range: 699 MHz to 1980 MHz
Cellular Operation Mode: HD-FDD
RF Output Power: -40 dBm to +23 dBm
LTE-M Specifications   LTE-M Bands: B1, B2, B3, B4, B5, B8, B12, B13, B14, B17, B18,B19, B20, B25, B26, B28, B66
Low Band RX Sensitivity: -108 dBm
Middle band Rx Sensitivity: -107 dBm
Uplink Speed: 300 Kbps
Downlink Speed: 375 Kbps
LTE CAT-NB1 and LTE CAT-NB2 Specifications   LTE CAT-NB1 and LTE CAT-NB2 Bands: B1, B2, B3, B4, B5, B8,
B12, B13, B17, B19, B20, B25, B26, B28, B66
RX Sensitivity: -114 dBm
Uplink Speed: 30 Kbps
Downlink Speed: 60 Kbps
SIM Specification   Soldered-Down SIM: No Support
External Sim Interface: Support for an external SIM interface
Cellular Certifications   Verizon ODI: TBD
GPS Specifications   GPS Band: GPS L1 C/A
GPS Center Frequency: 1575.42 MHz
Sensitivity, Cold Start: -142dBm
Sensitivity, Hot Start: -145dBm
Sensitivity, Tracking: -151dBm
Cold Start TTFF: 40 seconds
Hot Start TTFF: 1.5 seconds
Typical Power Consumption


(VCC = 3.3V, VCC_GPIO = 3.3V,


  Socket Dial, Good Signal Strength: Avg: 24 mA, Max: 46 mA
Socket Dial, Fair Signal Strength: Avg: 25 mA, Max: 108 mA
Socket Dial, Poor Signal Strength: Avg: 27 mA, Max: 344 mA
Registered Idle: Average: 3.58 mA, Max: 36 mA
Unregistered Idle: Average: 533 uA, Max: 7.5mA
Powered Off: Average: 2.4 uA, Max: 71 uA
GPS: Average: 43 mA, Max: 59 mA
Dimensions (mm)   22.9 × 21.9 × 2.0
Power Supply Inputs   Supply Voltage (VCC): 3.0V to 3.6V
GPIO Reference Voltage (VCC_GPIO): 1.8V to 3.6V
Antenna   External (BT/Wi-Fi 2.4GHz, GPS 1575.42 MHz, LTE CAT 699 ~ 1980 MHz)
Operating Temperature   -40°C ~+85°C
Storage Temperature   -40°C ~ +85°C
Miscellaneous Lead Free Lead-free and RoHS compliant
Warranty One Year
Humidity   20% ~ 90% non-condensing
MSL grade:   MSL 3
ESD grade:   Human Body Model: ±1500V
Human Body Model Class: 1C
Charge device model: ±250V
Scroll to Top

Send Inquiry