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Phychips RED4S RFID Module User Manual

Phychips RED4S RFID Module featured

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Phychips RED4S RFID Module

Phychips RED4S RFID Module

About Phychips
In order to create ultra-small, low-power semiconductor chips (SoCs) for RFID readers, RFID modules, and antennas, Pychips, an RFID technology business, leverages its wireless communication core semiconductor source technology. It reduces the customer’s development time and costs by offering the turn-key supply of all the critical parts needed to build RFID solutions.

Pin Description

Phychips RED4S RFID Module fig-1

RED4S Pin Description






Pin Name




1 VCC36 DC Power for Reader SOC
2 GND Ground
3 P04_SPI_TXD Quasi-bi directional I/O port or SPI Output
4 P05_SPI_RXD Quasi-bi directional I/O port or SPI Input
5 P06_SPI_CLK Quasi-bi directional I/O port or SPI Clock
6 P07_SPI_CS Quasi-bi directional I/O port or SPI Chip Select












When ISP_MODEb is Logic ‘Low’, ISP mode is set as shown below the table








[CAUTION] Except ISP mode, ISP_MODEb should be set logic ‘High’ for robust stability for FLASH memory

8 CSE Chip Select enable / module power enable 0:Disable 1: Enable
9 NC Not Connection
10 P15 Quasi-bi directional I/O port


[NOTE] This pin is already used internally. So this pin should be only for ISP mode

11 P16 Quasi-bi directional I/O port or External Interrupt 4
12 P17 Quasi-bi directional I/O port or External Interrupt 5






Quasi-bi directional I/O port I2C Clock The pull-up resistor is always switched on.


Reserved Address: 0x70, 0x71







Quasi-bidirectional I/O port I2C Data In / Out The pull-up resistor is always switched on.


Reserved Address: 0x70, 0x71

15 GND Ground
16 GND Ground
17 GND Ground
18 RF IO Rx Input / Tx Output
19 GND Ground
20 VCC36P DC Power for Power Amp
21 VCC36P DC Power for Power Amp
22 GND Ground
23 GND Ground
24 GND Ground
25 GND Ground
26 GND Ground
27 GND Ground
28 SWDIO Serial Wire Debug data in out
29 SWCLK Serial Wire Debug Clock
30 RESETb Reader SOC Reset signal 0: reset
31 NC Not Connection
32 NC Not Connection
33 NC Not Connection
34 P01_TXD0 Quasi-bi directional I/O port or UART0 Output
35 P00_RXD0 Quasi-bi directional I/O port or UART0 Input


Operation Method (Installation guide for power supply)

Phychips RED4S RFID Module fig-2

Phychips RED4S RFID Module fig-3

Power Supply
DC power to operate RED4S is separated into 2 kinds. VCC36 is to supply PR9200 whose power range is 3.3 to 3.6 volts, and VCC36P is to supply for power amp whose power range is 3.3 to 4.2 volts.

In a mobile device with a battery, VCC36P can be connected to battery power directly. VCC36 pins need to external LDO (or another device). As the Host control the LDOs enable, the user controls the power-down mode of the module. If you do not control external LDO, you can control the CSE pin to enter power-down mode instead.

The serial interface is assigned two wires. RXD0, which pin is assigned to pin 35, is for receiving commands from the host, and TXD0, which pin is assigned to pin 34, is for transmitting responses to the host. The pin connection is shown in the below figure.Phychips RED4S RFID Module fig-4

The following configuration is used for interfacing with the USB transceiver.Phychips RED4S RFID Module fig-5

RF In/Out
RF I/O which is assigned to Pin 18 is optimized with a 50ohm impedance.

GUI Control
The RED Utility helps the user to start working with the RED DK RFID reader quickly. Follow the below steps to run GUI. Windows Start button – Program Menu – RED Utility_vX.X.XPhychips RED4S RFID Module fig-6

Mode Change

RED Utility provides two view modes. Users can select view mode depending on the purpose of use between Basic View Mode and Extended View Mode.Phychips RED4S RFID Module fig-7

To change View Mode, click the extension button marked red in Figure 7 above.Phychips RED4S RFID Module fig-8

Always use Extended View Mode for measurement.

RED4S Connection
If the hardware connection is valid, the RED utility connects module REDx automatically. If the utility cannot connect the hardware, please follow the below step Click “Connection->Connect” to connect to REDx-DK through USB-to-UART at the main window GUI will find the Device and synchronize parameters with the RED4S Connection module automatically. If the GUI cannot find the device automatically, Click “Connection->Port Setting” and select other Device. The Default Baud rate is 115200 bit/s.Phychips RED4S RFID Module fig-9

If the Device is connected successfully, the status bar will display the “OPEN” state and device number, and so on.Phychips RED4S RFID Module fig-10

Hardware Control
Click ‘H/W Control Tab.’ To control hardware.

Band(Region) Setting
To select an operating band, a band setting should be required. Select the band in the combo box and click the Set button to set the operating band in the group box ‘Frequency Control.’Phychips RED4S RFID Module fig-11


Power Class Setting
Some countries classify channel numbers by power class. Click the Get button and choose the required power class. And then click the Set button to set finally.Phychips RED4S RFID Module fig-12

Output Power setting
To set RED output power, select the Output Power combo box and click the Set button.Phychips RED4S RFID Module fig-13

CW (Continuous Wave) setting
It is only used for hardware debugging. To set CW on, click Turn Tx CW on the button. To set CW off, click Tx CW off button.Phychips RED4S RFID Module fig-14

Tag Inventory Procedure
Click the Start button in Tag Information Tab to read the UHF RFID tag with RED Utility.Phychips RED4S RFID Module fig-15

Click the Start button and Tag’s EPC information is displayed.Phychips RED4S RFID Module fig-16


No. Item Unit Test Condition Specification Remark
min Typ. max
1 Frequency Range MHz   917.1   926.9  
2 Tx Power dBm     26 27 PEAK
3 Spurious dBm   US (FCC 15C)  
4 Impedance Ω     50   RF I/O
5 DC Power VCC36P V   3.3 3.6 4.2  
VCC36 3.3   3.6
6 Operating Temperature °C   -20   70  
7 Operating Humidity %   0   90  






Power Down uA Active current is measured at 25dBm with 50ohm load     20  
Idle mA     20
9 Size mm 24.0 * 24.0 * 3.0  
10 Weight g 3  


  • Device Name(Model Name) : RED4S
  • Name of Grantee: PHYCHIPS Inc.
  • Production year, month, and date
  • Manufacturer/Country: Korea

FCC Information to User

This device complies with Part 15 of FCC Rules. Operation is subject to the following two conditions:

  1. The device may not cause interference, and
  2. The device must accept any interference, including interference that may cause undesired operation of this device.

Caution: Any changes or modifications in the construction of this device that are not expressly approved by the party responsible for semiconductor chips could void the user’s authority to operate the equipment This device generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and the receiver.
  • Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technical for help.

End Product Labeling
The module is labeled with its own FCC. If the FCC ID is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. In that case, the final end product must be labeled in a visible area with the following:

“Contains FCC ID: Y3D-RED4S”
OEM Responsibilities to comply with FCC The module has been certified for integration into products only by OEM integrators under the following condition:

  • The antenna(s) must be installed such that a minimum separation distance of at least 20 cm is maintained between the radiator (antenna) and all persons at all times.
  • The module is limited to installation in mobile or fixed applications.
  • The transmitter module must not be co-located or operating in conjunction with any other antenna or transmitter except in accordance with FCC multi-transmitter product procedures.
  • Separate approval will be required for all other operating configurations, including portable configurations with respect to Part 2.1093 and different antenna configurations other than supplied antennas.
  • The end product must have a power supply regulation circuit. The supply voltage for this module is 3.3~3.6V. Please refer to the installation guide. (on page 5)

As long as the condition above is met, further transmitter testing will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.).

In the event that these conditions cannot be met, then the FCC authorizations are no longer considered valid and the FCC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product including this module, and obtaining separate FCC authorizations.

  • This device is intended only for OEM integrators
  • For OEM integration only – the device cannot be sold to the general public.
  • Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module.

This device may only operate using an antenna of a type and maximum (or lesser) gain approved by Phychips. Antenna types not included in the list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this transmitter.


  Peak Gain Part Name
ANT 3.72 dBi KSA 921A6015B100B

FAQs Phychips RED4S RFID Module

What is the Phychips RED4S RFID module used for?

The Phychips RED4S RFID module is a compact, high-performance module for Near Field Communication (NFC) and Radio Frequency Identification (RFID) applications. It supports ISO14443A/B, ISO15693, and ISO18000-3 protocols and can be used for a variety of applications such as access control, inventory management, and payment systems.

How does the Phychips RED4S module work?

The Phychips RED4S module works by emitting a radio frequency signal that can be received by an RFID reader or an NFC-enabled device. The module can also receive signals from RFID tags and NFC devices, allowing it to read the data stored on them.

What is the communication range of the Phychips RED4S module?

The communication range of the Phychips RED4S module depends on the specific application and environment in which it is used. In general, the module has a range of up to 10 cm for NFC applications and up to several meters for RFID applications.

Is the Phychips RED4S module compatible with different operating systems?

The Phychips RED4S module is compatible with a variety of operating systems, including Windows, Linux, and Android. The module comes with a software development kit (SDK) that includes drivers and sample code for different operating systems, allowing developers to easily integrate the module into their applications.

What are the technical specifications of the Phychips RED4S module?

Some of the technical specifications of the Phychips RED4S module include an operating frequency range of 13.56 MHz, a communication speed of up to 848 kbps, a built-in antenna, and support for multiple RFID protocols. For a full list of technical specifications, you can refer to the product datasheet available on the Phychips website.

Can the Phychips RED4S module be used for multiple RFID applications?

Yes, the Phychips RED4S module is a versatile module that can be used for multiple RFID applications, including access control, inventory management, and payment systems. It supports multiple RFID protocols, making it suitable for a wide range of applications.

How do I integrate the Phychips RED4S module into my system?

The Phychips RED4S module can be easily integrated into your system through the use of its software development kit (SDK). The SDK includes drivers and sample code for different operating systems, allowing developers to easily interface with the module and implement their desired applications.

Is the Phychips RED4S module easy to use?

Yes, the Phychips RED4S module is designed to be user-friendly and easy to use. It comes with a comprehensive SDK and detailed documentation, making it straightforward for developers to integrate the module into their systems and implement their desired applications.

How does the Phychips RED4S module compare to other RFID modules in terms of performance and features?

The Phychips RED4S RFID module is a high-performance module that offers a number of advanced features and capabilities. It supports multiple RFID protocols, has a high communication speed, and is designed to be user-friendly and easy to use. When compared to other RFID modules, the Phychips RED4S module offers a high level of performance and versatility.

Where can I purchase the Phychips RED4S RFID module?

The Phychips RED4S RFID module can be purchased from authorized distributors and resellers of Phychips products. You can find a list of authorized distributors on the Phychips website.

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