EM2420-STR Ember, EM2420-STR Datasheet - Page 28

• Manufacturer Part Number: EM2420-STR
• Description: IC RF TXRX ZIGBEE 2.4GHZ 48-QLP
• Manufacturer: Ember

Specifications of EM2420-STR

• Mfg Application Notes: EM2420
• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: ZigBee™
• Power - Output: -3dBm
• Sensitivity: -94dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 19.7mA
• Current - Transmitting: 17.4mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-QLP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -

Microcontroller Interface and Pin Description
When used in a typical system, the
will interface to a microcontroller. This
microcontroller must be able to:
• Program the
• Interface to the receive and transmit
• Interface to the CCA pin for clear
• Interface to the SFD pin for timing
Configuration interface
An
example is shown in Figure 10. The
microcontroller uses 4 I/O pins for the SPI
Ember Part Number: 120-0049-000D
modes, read and write buffered data,
and read back status information via
the
interface (SI, SO, SCLK and CSn).
FIFOs using the FIFO and FIFOP
status pins.
channel assessment.
information (particularly for beaconing
networks).
EM2420
4-wire
CSn
-to-microcontroller
SO
SI
Command
SPI-bus
ADDR
Status
Strobe
EM2420
Figure 9. Multiple SPI Access Example
ADDR
Status
into different
configuration
Register
DATA
Read
interface
EM2420
-
8MSB
EM2420 Datasheet
DATA
-
8LSB
ADDR
Status
configuration interface (SI, SO, SCLK and
CSn). SO should be connected to an input
at the microcontroller. SI, SCLK and CSn
must
Preferably the microcontroller should have
a hardware SPI interface.
The microcontroller pins connected to SI,
SO and SCLK can be shared with other
SPI-interface devices. SO is a high
impedance output as long as CSn is not
activated (active low). An internal pull-up
on the SO pin may be enabled in the
IOCFG0.SO_PULLUP configuration bit.
CSn should have an external pull-up
resistor or be set to a high level when the
voltage regulator is turned off in order to
prevent the input from floating. SI and
SCLK should be set to a defined level to
prevent the inputs from floating.
For a more complete example, please
refer to Ember’s EM2420 Reference
Design
(www.ember.com).
TXFIFO
DATA
Status
be
ADDR
on
TXFIFO
Write
DATA
Status
microcontroller
the
ADDR+1
DATA
Status
EM2420
Ember
ADDR+2
Page 28 of 84
outputs.
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