User's Manual

MPQ Test Radio Z
2005-10-03
LOGITECH CONFIDENTIAL
(Printed on 10/3/2005 ) page 18 of 19
to insert as much ground cobber below the L-ZM2102 Z-Wave Module as possible on the Application
PCB.
2.9.3 Antenna Interconnection
As the RF signal (EP18) is 50ohm the trace from the EP18 to the matching circuitry (see 1.3.2) must be 50ohm.
The Application PCB designer must therefore take the PCB layer structure and thickness into account when
designing the 50ohm trace (either Microstrip or Stripline).
3 SOFTWARE
3.1 SPI Interface
The signals ‘P1.2/MISO’, ‘P1.4/SCK’ and ‘P1.3/MOSI’ signals are in some SW API’s used by the protocol to
store Routing Tables and HomeID in an external EEPROM. When these SW API’s are used, the Application SW
must not
use these three signals. Table 9 shows the available SW API’s and in which the SPI interface is used by
the protocol.
SW API SPI interface used by Protocol
Slave No
Routing Slave No
Enhanced Slave Yes
Controller
Yes
Static Controller Yes
Installer Yes
Bridge Yes
Table 9 SW API / SPI availability
3.2 EEPROM
Some SW API’s require an external EEPROM to be implemented on the Application PCB for protocol information
storage (like routing table, HomeID etc.). The SPI interface is used to access the EEPROM and the ‘P1.5’ signal
(EP5) is used by the Z-Wave Protocol as EEPROM Chip Select. To assure proper control of the EEPROM chip
select signal during reset and power-up a pull up resistor on the P1.5 should be implemented as shown in Figure 8.