WeatherFlow WXFLW001 User Manual

User Manual

WF-RF915

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1 Description

The WF-RF915 SOC RF module contains a 32-but ARM® Cortex®-M4 core with 32 kB ram and
256 kB flash running at 38.4 Mhz. The built in 915Mhz @ 7.4dBm radio has the capability to
transmit over long distances using little power.

2 Application

Smart Weatherstation Control and Communications.

3 Features

● 32-bit ARM® Cortex®-M4 core

● Autonomous Hardware Crypto Accelerator and Random Number Generator

● Integrated balun for 7.4 dBm transmit power

4 Block Diagram

8 MiB Flash

(optional)

EFR32FG

OSC

38.4 Mhz

VCC
I2C (x1)

GPIO (x10)

RF Front End

External Antenna

5 Pin Description

Pin
No.

Signal Name

Type

Pin Name

Description

1

Ground

SIG

-

Ground

2

NC - -

3

I2C_SDA

IO

PD15

I2C #0 SDA

4

I2C_SCL

IO

PD14

I2C #0 SDC

5

Port A0

IO

PA0

GPIO 1

6

Port A1

IO

PA1

GPIO 2

7

Port B11

IO

PB11

GPIO 3

8

Port B12

IO

PB12

GPIO 4

9

Port B13

IO

PB13

GPIO 5

10

Ground

SIG

-

Ground

11

Ground

SIG

-

Ground

12

VCC 3.3

SIG

-

Power Supply 3.3v

13

Port C11

IO

PC11

GPIO 6

14

Port F0

IO

PF0

GPIO 7

15

Port F1

IO

PF1

GPIO 8

16

Port F2

IO

PF2

GPIO 9

17

Port F3

IO

PF3

GPIO 10

18

RESET

IO

NRST

RESET_N

19

NC - -

20

Ground

SIG

-

Ground

5.1 Pin Map

6 Electrical Specification

Parameter

Min Typ

Max

Storage Temperature Range

-

50 - 150

External main supply voltage

0 - 3.8

External main supply voltage ramp rate

- - 1

Voltage on any 5V tolerant GPIO pin

1

-

0.3

-

Min of 5.25 and

IOVDD + 2

Voltage on non-5V tolerant GPIO pins

-

0.3 - IOVDD + 0.3

V

Voltage on HFXO pins

-

0.3 - 1.4

V

Voltage differential between RF pins (2G4RF_IOP -

2G4RF_ION)

-50 - 50

mV

Absolute Voltage on RF pins 2G4RF_IOP and

2G4RF_ION

-0.3 - 3.3

V

Voltage differential between RF pins (SUBGRF_IP -

SUBGRF_IN)

-

50 - 50

mV

Absolute Voltage on RF pins SUBGRF_IP, SUBGRF_IN,

SUBGRF_OP, and SUBGRF_ON

-

0.3 - 3.3

V

Total current into VDD power lines (source)

- - 200

mA

Total current into VSS ground lines (sink)

- - 200

mA

Current per I/O pin (sink)

- -

50

mA

Current per I/O pin (source)

- - 50

Current for all I/O pins (sink)

- - 200

mA

6.1 Absolute Maximum Ratings

Stresses above those listed below may cause permanent damage to the device. This is a stress
rating only and functional operation of the devices at those or any other conditions above those
indicated in the operation listings of this specification is not implied. Exposure to maximum
rating conditions for extended periods may affect device reliability.

Table 6.0

Unit

°C

V

V / μs

V

mA