ETRX2HR-PA Telegesis Ltd, ETRX2HR-PA Datasheet - Page 11

• Manufacturer Part Number: ETRX2HR-PA
• Description: MODULE
• Manufacturer: Telegesis Ltd

Specifications of ETRX2HR-PA

• Module Applications: AMR, Building Automation, Wireless Sensor Network, M2M Industrial Controls
• Mcu Supported Families: EM250
• Processor Type: EM250
• Wireless Protocol: IEEE 802.15.4
• Data Rate: 250Kbps
• Module Interface: I2C, SPI, UART
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4 Hardware Description
4.1 Hardware Options
Please contact the manufacturer if any of the options described below could be useful in your
product design. Please note that to include these options a high order quantity is required and
they are not available as standard products.
4.1.1
Although the EM250 already contains an internal LDO regulator, the module can be supplied with
an additional integrated onboard LDO regulator or DC/DC converter. Some applications could
benefit from this additional regulator in instances where:
(1) Further extension of the input voltage range is required
(2) Extended battery life is obtained by replacing the regulator within the EM250 with a special
(3) Operation is required using very noisy power supplies
Two different types of regulators are available, a linear low dropout (LDO) type or a high efficiency
switched buck regulator.
optimum regulator can be selected.
4.1.2
A second option which is available is an on board 32.768kHz crystal reference. This option can be
provided for applications which require a high precision reference clock.
4.1.3
Thirdly, the RF output can be connected to pad 2 for routing on to the underlying circuit board.
There is then no ceramic antenna nor U.FL connector.
©2009 Telegesis (UK) Ltd
Pad 2
U.FL socket
integrated
antenna
ultra-low quiescent current regulator
On-board DC Regulator
On-board Reference Crystal
RF output pad
terminal
selection,
filtering and
matching
circuitry
VBAT
rf
LDO
or
DC
converter
(optional)
PA
Rx/Tx
switch
Depending on the power supply conditions of the application the
VREG
BALUN
BALUN
Figure 2: Hardware Diagram
1,8Vdc
VBAT
Tx
Rx
- 11 -
LDO
24MHz
RF transceiver 2.4GHz
128kB flash / 5k RAM
16-bit XAP16b uC
EM250
32,768kHz
(optional)
ETRX2PA Product Manual (Rev 1.07)
GPIO16
RESET
4
GPIO0
SIF
programming
RESET
ETRX2PA
I / O