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Cap CC1101 - Sub-GHz radio and NFC module for Cardputer Adv - CC1101 and ST25R3916 - M5Stack U219
Sub-GHz radio and NFC module for Cardputer Adv: CC1101 and ST25R3916 chips on the SPI bus.
- 315 MHz, 433 MHz, 868 MHz and 915 MHz bands with an RP-SMA antenna connector
- 13.56 MHz NFC with tag read, write and emulation
- Three RP-SMA antennas matched to the supported bands included in the set
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Sub-GHz radio and NFC for Cardputer Adv
M5Stack Cap CC1101 is an expansion module with a Sub-GHz radio and an NFC reader for the Cardputer Adv and CardputerZero. The radio is based on the CC1101 chip and the reader on the ST25R3916 chip. The whole module works in the 315 MHz, 433 MHz, 868 MHz and 915 MHz bands, and you connect the antennas to a shared RP-SMA connector.
The module communicates with the computer over the SPI bus and has its own DC-DC converter. The Grove HY2.0-4P port in the PORT.A standard lets you connect I2C sensors.
Module with an RP-SMA antenna connector and a Grove port
4 bands
Sub-GHz radio: 315 MHz, 433 MHz, 868 MHz and 915 MHz
+10 dBm
transmit power of the CC1101 radio chip
441 m
range in the 433 MHz band with FSK modulation at 58 kb/s
13.56 MHz
NFC with tag read, write and emulation
Three RP-SMA antennas in the set matched to the radio bands
Sub-GHz radio with band switching
The CC1101 chip supports 2-FSK, 4-FSK, GFSK, MSK, ASK and OOK modulation, and received and transmitted data go to separate 64 B FIFO buffers. The receiver has a sensitivity of up to -99.5 dBm, and the transmitter works at +10 dBm. With FSK at 58 kb/s you can reach up to 441 m.
Two RF switches with matching circuits route the signal of the selected band to a single RP-SMA connector. You select the band in software with the RF_SW0 and RF_SW1 lines, and in UiFlow2 switching happens automatically after you set the frequency. The antennas are 108 mm long.
NFC: tag read, write and emulation
The ST25R3916 chip works at a frequency of 13.56 MHz, has a 512 B FIFO buffer and connects to the computer over the SPI bus. As a reader and writer it supports the NFC-A and NFC-B standards compliant with ISO14443A/B, NFC-F, i.e. FeliCa, and NFC-V, i.e. ISO15693.
After switching to emulation mode, the module imitates an NFC-A or NFC-F card. The manufacturer's examples read the full data of an NFC-A tag and write an NDEF message with an address and text. You can check an emulated NDEF tag with a phone or NFC reader.
CC1101 and ST25R3916 chips marked on the module label
The expansion connector on the underside connects the module to the computer
Mounting on Cardputer Adv and the Grove port
You plug the module into the computer with the 14-pin connector on the underside, which carries the SPI and I2C buses and 5 V power. Two mounting holes fit both computers. The manufacturer recommends M2 x 4 mm screws, as longer ones may damage the board.
The Grove HY2.0-4P port in the PORT.A standard provides the I2C bus and 5 V power, so you can connect further sensors here. When working with the CardputerZero, attach and remove the module only with the device powered off, because it is not designed for hot swapping.
Programming in Arduino IDE and UiFlow2
In the Arduino IDE you program the radio with the RadioLib library and the NFC with the M5UnitUnifiedNFC library, together with the M5Cardputer, M5Unified and M5GFX libraries. The examples include both a transmitter and a receiver.
In UiFlow2 and MicroPython the CC1101Cap class is used for the radio and the NFCCap class for NFC. The ready-made programs send a packet every second, receive data together with RSSI, LQI and CRC status, and read the UID of an NFC card. You can find the full examples and a description of the libraries in the manufacturer's documentation.
Module with the Sub-GHz antenna screwed onto the SMA connector
Is it the right choice for you?
A good choice if:
- You are building a transmitter or receiver in the 433 MHz or 868 MHz band on Cardputer Adv
- You want to read and write NFC tags or emulate an NDEF tag
- You are prototyping radio communication between your own IoT devices
Consider another option if:
- You need LoRa connectivity and GNSS positioning: Cap LoRa 1262 - M5Stack U214
- You prefer a Unit NFC reader with ST25R3916: Unit NFC - M5Stack U216
Did you know?
Over 680 times lower current draw in sleep mode
With the CC1101 and ST25R3916 chips asleep, the module draws 140.87 µA at 5 V. With continuous transmission at maximum power and card reading, the draw rises to 96 mA, over 680 times higher.
Frequently asked questions
Which devices does the Cap CC1101 module work with?
The module works with the Cardputer Adv and CardputerZero computers. With the CardputerZero, attach and remove it only with the device powered off.
Which antennas come with the Cap CC1101 module?
The set includes three 108 mm RP-SMA antennas: for 315 MHz, 433 MHz, and 868 MHz (also 915 MHz).
Which NFC tag standards does the Cap CC1101 module support?
In reader and writer mode the module supports NFC-A, NFC-B, NFC-F and NFC-V, i.e. ISO14443A/B, FeliCa and ISO15693. It can emulate NFC-A and NFC-F cards.
Package contents
- 1 x Cap CC1101 module
- 1 x RP-SMA antenna 315 MHz
- 1 x RP-SMA antenna 433 MHz
- 1 x RP-SMA antenna 868 MHz and 915 MHz
Technical specification
| Parameter | Value |
|---|---|
| Manufacturer | M5Stack |
| Manufacturer code | U219 |
| Intended use | expansion module for Cardputer Adv and CardputerZero |
| Radio chip | CC1101, Sub-GHz |
| Radio bands | 315 MHz, 433 MHz, 868 MHz, 915 MHz |
| Modulations | 2-FSK, 4-FSK, GFSK, MSK, ASK, OOK |
| Transmit power | +10 dBm |
| Receiver sensitivity | down to -99.5 dBm |
| Range (FSK, 58 kb/s) | 315 MHz: 435 m; 433 MHz, 868 MHz and 915 MHz: 441 m |
| Antenna connector | RP-SMA female |
| Antennas in the set | 3 RP-SMA antennas 108 mm: 315 MHz, 433 MHz, 868 MHz and 915 MHz |
| NFC chip | ST25R3916, 13.56 MHz, 512 B FIFO |
| Reader and writer mode | NFC-A/B (ISO14443A/B), NFC-F (FeliCa), NFC-V (ISO15693) |
| Card emulation mode | NFC-A, NFC-F |
| Interface | SPI |
| Expansion port | Grove HY2.0-4P (PORT.A, I2C) |
| Sleep current draw | 140.87 µA at 5 V (CC1101 and NFC asleep) |
| Operating current draw | 96 mA at 5 V (transmitting at max. power and reading cards) |
| Software | Arduino IDE (RadioLib, M5UnitUnifiedNFC), UiFlow2, MicroPython |
| Dimensions | 84 x 24 x 19.7 mm |
| Package dimensions | 170 x 120 x 17 mm |
| Weight | 14.9 g |
| Weight with packaging | 37.5 g |
Useful links
| Name | Value |
|---|---|
| Width | 17 cm |
| Height | 12 cm |
| Depth | 1.7 cm |
| Weight | 0.038 kg |
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30 days to return, without giving a reason
If the product does not meet your expectations, you have 30 days from receiving the parcel to withdraw from the contract. The product only has to be complete. The right of return belongs to consumers (a purchase unrelated to business activity).
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If the product turns out to be faulty, you can make a claim under the guarantee or the statutory warranty. We handle claims without delay, at the latest within 14 working days of receiving the report together with the goods.
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Instructions and documents
GPSR data
Product information
This product is a component intended for further assembly or prototyping. It is not a finished product within the meaning of the product safety regulations.
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