PIXIE-SLLS-DIL Flexipanel, PIXIE-SLLS-DIL Datasheet - Page 5

• Manufacturer Part Number: PIXIE-SLLS-DIL
• Description: Zigbee / 802.15.4 Modules & Development Tools PixieMAC Sleepy End Device DIL
• Manufacturer: Flexipanel

Specifications of PIXIE-SLLS-DIL

• Wireless Frequency: 2.4 GHz to 2.5 GHz
• Modulation: DSSS OQPSK
• Output Power: 1 mW
• Antenna: G-Antenna
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The IEEE 802.15.4 communications protocol is packet-based, so the serial data is divided into
packets. StarLite packets contain of up to 64 bytes of data. A packet is transmitted whenever a total
of 64 bytes is received or if there is a gap of more than ReleaseTime between serial data bytes. In
Addressed mode, the first two bytes after a ReleaseTime delay are interpreted as an address and all
further data will be sent to that address until a further gap in transmission of at least ReleaseTime.
(Refer to the ReleaseTime in the device configuration section, and the Addressing section below.)
If data is received on the RxD pin but transmission to the remote device is not successful, the status
indicator on the packet transmitting device will go high for approximately a quarter of a second.
Flow control does not account for the possibility that so many data packets are received than can be
buffered and output on the TxD pin. If this condition occurs, the status indicator on the packet
receiving device will go high for approximately a quarter of a second. To avoid this possibility, it is
recommended that the 115200 baud rate is used, since this is well above the over-the-air data
transfer rate. (For watertight flow control, the PixieCOM firmware must be used.)
Addressing
Devices are configured to communicate in Broadcast, Star or Addressed Packet modes.
If a device is operating in Broadcast mode, all data input to it is sent to all StarLite devices in the
network. Broadcast transmissions are not acknowledged and are only transmitted once. Sleepy
devices cannot receive broadcast transmissions while sleeping.
If an end device is operating in Star mode, all data input to it are sent to the coordinator only. If the
coordinator is operating in Star mode, all data are sent to the last end device to transmit to it (or the
first device to connect, if no device has transmitted data to the coordinator yet).
If a device is operating in Addressed mode, the first two bytes in a ReleaseTime-delineated data
packet are interpreted as an IEEE 802.15.4 short address rather than data, i.e.:
Non-broadcast transmissions are acknowledged. If transmission fails, three further attempts will be
made to transmit the data. If all four attempts fail, the data is discarded and the Status LED will light
for approximately one second.
It is permissible to mix and match device modes, for example having the end devices operating in
star mode and the coordinator operating in broadcast mode. For point-to-point communications, use
a coordinator and an end device in star mode; broadcast mode is less desirable because it is not
acknowledged.
Sleep Management
The SLLS version is allowed to sleep. It goes into sleep mode when the sleep pin goes high; during
sleep, the RTS pin will output high.
Page 5
14-Jan-08
First byte
0x00
0x00
0x01
0xFF
n
StarLite DS505-4
Second byte
0x00
0x01
0x01
0x01
0xFF
Destination
Coordinator
1
2
n
Broadcast
FlexiPanel Ltd
st
nd
th
device to be bound
device to be bound
device to be bound
Patents may apply and/or pending
www.FlexiPanel.com