SRF - technical data

SRF: Surface Mount Wireless Serial Data Module

The SRF is designed for wireless transmission and reception of serial data in an easy to use surface mounted module. It has an on-board balun and chip antenna, which can be detached for applications where an external antenna is required.

The SRF makes use of Texas Instruments CC1110 or CC1111, a low-power System-on-Chip, which sports a micro-controller unit (MCU), memory, a sub-1GHz transceiver, an encryption engine and a USB controller (for the CC1111 based module). This chip has been pre-loaded with Ciseco firmware such that multiple SRF modules provide a wireless RF serial connection without any need for programmer or end-user configuration.

The SRF serial is a surface mount equivalent to the XRF, the SRF USB is a surface mount equivalent to the URF. The URF stick makes use of the SRF USB.

 

Technical specification

Operating Conditions

 

 

Parameter

Min

Max

Unit

Condition

 

Operating ambient temperature, TA

0

85

°C

USB (CC1111)

 Operating ambient temperature TA-4085°CSerial (CC1110)
 

Operating supply voltage (VVD)

2.0

3.6

V

All supply pins must have the same voltage

 

Electrical Specification

 

 

Parameter

Value

Unit

Condition

 

TX current consumption

36.2

mA

10 dBm (max power)

 

TX current consumption

21.0

mA

@ 0 dBm

 

TX current consumption

20

mA

@ -6 dBm

 

RX current consumption

23.8

mA

Max @ 868.3 MHz

 

Sleep mode current

123.2

μA

ATSM1 sleep pin low@ 2.6V

 

Deep sleep current

0.2

μA

ATSM2 sleep pin high @ 2.6V

 

Absolute Maximum Ratings

Under no circumstances must the absolute maximum ratings given in the table below be violated. Exceeding one or more of the limiting values may cause permanent damage to the device.

 

Parameter

Min

Max

Unit

Condition

 

Supply voltage (VVD)

-0.3

3.9

V

All supply pins must have the same voltage

 

Voltage on any digital pin

-0.3

VDD + 0.3, max 3.9

V

 

 

Voltage ramp-up rate

 

120

KV/μs

 

 

Input RF level

 

10

Dbm

 

 

Storage temperature range

-50

150

ºC

Device not programmed

 

Solder reflow temperature

 

260

ºC

According to IPC/JEDEC J-STD-020D

 

ESD

 

750

V

According to JEDEC STD 22 method A114, Human Body Model (HBM)

 

ESD

 

750

V

According to JEDEC STD 22, C101C, Charged Device Model (CDM)

 

Dimensions

The SRF measures

·         26.4 X 15.9 X 2.0 mm

 

 Pin and I/O Configuration

 

 

Pin

SRF Serial

SRF USB

 

1

Heartbeat

Heartbeat

 

2

DIN

DIN

 

3

DOUT

DOUT

 

4

DTR in

USB Enable

 

5

Remote Reset

 

 

6

LNA_EN

 

 

7

 

 

 

8

Antenna

Antenna

 

9

VVD

VVD

 

10

GND

GND

 

11

ON/-SLEEP Led

Remote Reset

 

12

Power on reset

USB Rx LED

 

13

Power on reset

USB Tx LED

 

14

SLEEP

 

 

15

RESET

RESET

 

16

RTS

 

 

17

 

USB/Serial

 

18

CTS in

CTS in

 

19

 

USB Data+

 

20

 

USB Data-

 

21

Tx LED/PAN_EN

 

 

 

 

Dimensional Drawings

 
 
 

Designing PCB's for the SRF

Eagle CAD Footprints for the SRF can be found in our Eagle Parts library 

https://github.com/CisecoPlc/Ciseco-Eagle-Library

 

We recommend including a 8 pin debuting/programming header in all design with the following layout

The numbers in green are the SRF pins to wire back to.

Pins 1 & 2 allow for external power to the SRF and GND matching for the signals

Pins 3, 4 & 5 allow for factor debugging and firmware restoration.

Pin 6 Mode pin, on SPI device this is needed to disable SPI and enable Serial Comms.

Pin 7 & 8 allows for Serial comms useful for user firmware upgrade's and setting changes.

If space is tight and you already have TX and RX available on other pins you can use the 6 pin verion of this lay out and omit 7 & 8 

You can see the 8 Pin version of this header on the Explorer Plus and the 6 pin version on the XinoRF and Slice or Radio

If space is realy tight we still recomend breaking out the pins to test pads, you can see an example of this on the underside of the RFµ-328