HS01-485-WBR3 Module Datasheet

Overview

HS01-485-WBR3 is a module that uses an RS-485 interface for transparent transmission over Wi-Fi. It consists of a highly integrated wireless RF chip RTL8720CF, RS-485 chip, and DC-DC power supply chip, with built-in Wi-Fi stacks and various library functions. This module combines a low-power KM4 microcontroller unit (MCU), WLAN MAC, and 1T1R (1 transmitter/1 receiver) design. It provides output frequency up to 100 MHz, 256 KB embedded SRAM, 2 MB flash memory, and configurable GPIOs that can function as digital peripherals for diverse applications.

Features

• Built-in low-power KM4 MCU that also acts as an application processor.

  • Clock rate of 100 MHz.

• Operating voltage: 5V.

• Peripheral: 1 universal asynchronous receiver/transmitter (UART).

• Wi-Fi connectivity

  • IEEE 802.11 b/g/n20.

  • Channels 1 to 14 at 2.4 GHz.

  • Support security protocols like WPA and WPA2.

  • The maximum output power is +20 dBm for IEEE 802.11b transmission.

  • Support access point (AP) mode.

  • Support Wi-Fi Easy Connect (EZ mode) pairing mode on Android and iOS devices.

  • Onboard PCB antenna.

  • Operating temperature range: -20°C to +85°C.

Applications

• Smart building
• Smart home and electrical appliance
• Healthcare
• Industrial wireless control
• Handheld device

Module interfaces

Dimensions and footprint

The electrical interface of the adapter board is a PH-4AW connector with a pin pitch of 2.54 mm.
The dimensions of the adapter board are 20 mm ± 0.35 mm (W) × 38 mm ± 0.35 mm (L) × 8.0 ± 0.15 mm (H). The figure below shows the dimensions and footprint design.

Pin definition

The following table lists the pin definitions.

Pin	Symbol	I/O type	Description
1	A	I/O	RS-485 communication port A
2	B	I/O	RS-485 communication port B
3	GND	P	Ground pin
4	5V	P	5V power input pin

Definitions of test points

The following table lists the test points.

Pin	Symbol	I/O type	Description
1	3V3	P	3.3V power pin on the module, used for flashing
2	GND	P	Ground pin
5	Rx	I/O	UART0_Rx used for authorization
6	Tx	I/O	UART0_Tx used for authorization
7	LOG_Tx	I/O	Serial port Tx for logging
8	LOG_Rx	I/O	Serial port Rx for logging

Electrical parameters

Absolute electrical parameters

Absolute parameters:

Parameter	Description	Min value	Max value	Unit
Ts	Storage temperature	-20	85	°C
VCC	Supply voltage	2.5	5.5	V
Electrostatic discharge voltage (human body model)	TAMB -25°C	-	2	kV
Electrostatic discharge voltage (machine model)	TAMB -25°C	-	0.5	kV

Operating conditions

Normal operating conditions:

Parameter	Description	Min value	Typical value	Max value	Unit
Ta	Operating temperature	-20	-	85	°C
VCC	Operating voltage	4.5	5	5.5	V
VIL	I/O low-level input	-0.3	-	VCC × 0.25	V
VIH	I/O high-level input	VCC × 0.75	-	VCC	V
VOL	I/O low-level output	-	-	VCC × 0.1	V
VOH	I/O high-level output	VCC × 0.8	-	VCC	V
Imax	I/O drive current	-	-	5	mA

Wi-Fi transmit power consumption

Power consumption during continuous transmission (TX)

Symbol	Mode	Power	Typical value	Unit
IRF	802.11b, 11 Mbit/s	18 dBm	231	mA
IRF	802.11g, 54 Mbit/s	15 dBm	159	mA
IRF	802.11n, MCS7 (20M)	13 dBm	145	mA

Wi-Fi receive power consumption

Power consumption during continuous reception (RX)

Symbol	Mode	Average value	Peak (Typical) value	Unit
IRF	802.11b, 11 Mbit/s	63	65	mA
IRF	802.11g, 54 Mbit/s	65	67	mA
IRF	802.11n HT20 MCS7	65	67	mA

RF features

Basic RF features

Basic RF features:

Parameter	Description
Operating frequency	2.400 to 2.4835 GHz
Wi-Fi standard	IEEE 802.11b/g/n (channels 1–14)
Data transmission rate	IEEE 802.11b: 1, 2, 5.5, and 11 Mbit/s IEEE 802.11g: 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s IEEE 802.11n: HT20 MCS0-7
Antenna type	PCB antenna

Wi-Fi output power

Power during continuous transmission (TX):

Parameter	Min value	Typical value	Max value	Unit
RF average output power, 802.11b CCK mode, 1 Mbit/s	-	17.5	-	dBm
RF average output power, 802.11g OFDM mode, 54 Mbit/s	-	14.5	-	dBm
RF average output power, 802.11n/n20 OFDM mode, MCS7	-	13.5	-	dBm
Frequency error	-20	-	20	ppm

Wi-Fi receiver (RX) sensitivity

RX sensitivity

Parameter	Min value	Typical value	Max value	Unit
PER < 8%, RX sensitivity, 802.11b CCK mode, 1 Mbit/s	-	-96	-	dBm
PER < 10%, RX sensitivity, 802.11g OFDM mode, 54 Mbit/s	-	-75	-	dBm
PER < 10%, RX sensitivity, 802.11n/n20 OFDM mode, MCS7	-	-72	-	dBm

Antenna information

Antenna type

There are two types of antennas: PCB antenna and external antenna. The PCB antenna is used by default. If you need to connect an external antenna, please contact Tuya sales personnel.

Antenna interference reduction

When a PCB antenna is used on a Wi-Fi module, we recommend that the module antenna is at least 15 mm away from other metal components. This can optimize the Wi-Fi performance. Traces and copper pour areas are not allowed in the antenna area of the PCB. Otherwise, antenna performance might be reduced.
Layout principles: Make sure that there is no substrate medium directly below or directly above the PCB antenna. Make sure that the printed antenna is away from the copper sheet. This maximizes the radiation performance of the antenna.

Packing and manufacturing

Mechanical dimensions

The dimensions of the adapter board are 20 mm ± 0.35 mm (W) × 38 mm ± 0.35 mm (L) × 8.0 mm ± 0.15 mm (H).

Production instructions

A delivered module must meet the following storage requirements:

• The moisture-proof bag must be placed in an environment where the temperature is below 30°C and the relative humidity is lower than 85%.
• The shelf life of a dry-packaged product is 6 months from the date when the product is packaged and sealed.