TXM-900-HP-II Linx Technologies Inc, TXM-900-HP-II Datasheet - Page 8

• Manufacturer Part Number: TXM-900-HP-II
• Description: TRANSMITTER RF 900MHZ 8-CHANNEL
• Manufacturer: Linx Technologies Inc
• Series: HP2r

Specifications of TXM-900-HP-II

• Frequency: 902MHz ~ 928MHz
• Applications: ISM, RKE, Security and Fire Alarms
• Modulation Or Protocol: FM, FSK
• Data Rate - Maximum: 50 kbps
• Power - Output: -3dBm ~ 4dBm
• Data Interface: PCB, Through Hole
• Antenna Connector: Through Hole
• Voltage - Supply: 2.17 V ~ 16 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Current - Transmitting: -
• Other names: TXM-900-HP2; TXM-900-HP2

POWER CONSIDERAT I O N S
POWER-UP
Page 8
The user must provide a clean source of
power to the transmitter module in order to
ensure proper operation. The transmitter
i n c o rp o rates a precision Low - D r o p o u t
Regulator on-board which allows the
module to operate over an input voltage
range of 2.7 to 16 volts DC. The module’s
power-supply line should have low ESR
bypass capacitors configured as shown in
figure 15.
The HP-II-TXM is controlled by an on-
board microprocessor. When power is
applied, a start-up sequence is executed.
At the end of the start-up sequence, the
transmitter is ready to transmit data.
Figure 16 shows the start-up sequence.
This sequence is executed when power is
applied to the VCC pin or when the PDN
pin is cycled from low to high.
Once the initial power-on delay has been
executed, the on-board microprocessor
reads the external channel-selection lines
and sets the frequency synthesizer to the
a p p r o p riate channel. Figure 4 on p. 3
shows the typical turn-on response time for
an HP Series-II tra n s m i t t e r. When the
frequency synthesizer has locked on to the
proper channel frequency, the circuit is
ready to accept data.This is acknowledged
by the CTS line transitioning high.
The transmitter is then ready to accept
modulated data from a user’s circuit.
The HP-II-TXM can be put into an ultra-
low-current (50µA) power-down mode by
holding the PDN pin low. This removes all
power from the transmitter’s circuitry. If
PDN is left floating or held high, the
transmitter will wake up and begin normal
operation. No transmitter functions work
when PDN is low.
Figure 15: Suggested supply filter
Figure 16: Start-up sequence