TRM-915-R250-CFT datasheet(5/39 Pages) LINX

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Figure 4: Electrical Specifications

250 Series Transceiver Specifications

Parameter

Symbol

Min.

Typ.

Max.

Units

Notes

Interface Section

Input Logic Low

I L

0.8

VDC

Input Logic High

I H

2.0

VDC

Output Logic Low

OL = 8.5mA

0.6

VDC

OL = 10µA

0.1

VDC

OL = 25mA

1.0

VDC

Output Logic High

OH = -3mA

CC–0.7

VDC

OH = -10µA

CC–0.1

OH = -10mA

CC-0.8

Flash Specifications (Non-Volatile Registers)

Flash Write Duration

Flash Write Cycles

20k

100k

cycles

CC = 3.3V

Into a 50-ohm load

At 25ºC

26 channels each

At 10-3 BER

in = -20dBm, 2 CW interferers, FRF =

915MHz, F

1 = FRF + 3MHz, F2 = FRF +

6MHz, max gain, high-sensitivity

Desired signal 3dB above input

sensitivity level, CW interferer power

level increased until BER = 10-2,

+/–1MHz

Pin Assignments

PR_PKT

TXD

CMD_RSP

C2D

RESET

GND

ANT

GND

RXD

RSSI

CMD

CTS

Figure 5: 250 Series Transceiver Pin Assignments (Top View)

Pin Descriptions

Pin Number

Name

I/O Description

PR_PKT

Processing Packet Indicator. This line goes

high when the module is processing a valid

or potentially valid packet.

TXD

UART Transmit Data Output. This is the

output line for the configuration command

responses as well as the data received over

the air.

3, 4, 5, 8, 17,

—

No Electrical Connection. Do not connect

any traces to these lines.

RESET

I/O

Reset line. This line is normally an input that

acts as an active low hardware reset line.

It does occasionally act as an output, so

please see the Reset section for details.

C2D

—

Reserved

CMD_RSP

Command Response. This line is low when

the data on the TXD line is a response to a

command and not data received over the

air.

Exception Output. A mask can be set

to take this line high when an exception

occurs. The line is lowered when the

exception register is read (regEXCEPTION)

11, 12, 13, 23

GND

—

Ground

RSSI

This line outputs an analog voltage that is

proportional to the strength of the incoming

signal.

CMD

Command Input. This line sets the serial

data as either command data to configure

the module or packet data to be sent over

the air. Pull low for command data; pull high

for packet data.

Buffer Empty. This line goes high when the

UART input buffer is empty, indicating that

all data has been transmitted.

CTS

UART Clear To Send, active low. This line

indicates to the host microcontroller when

the module is ready to accept data. When

CTS is high, the module is busy. When CTS

is low, the module is ready for data.

RXD

UART Receive Data Input. This is the input

line for the configuration commands as well

as data to be sent over the air.

ANT

—

50-ohm RF Antenna Port

24, 25, 26

VCC

—

Supply Voltage

Figure 6: 250 Series Transceiver Pin Descriptions

Pin Descriptions

TRM-915-R250-CFT Datasheet(PDF) 5 Page - Linx Technologies

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