SI4468-7 Datasheet, PDF (44/57 Pages) Silicon Laboratories – Highly configurable packet handler

Si4468/7
9. Standards Support
9.1. Wireless MBus Support
Wireless MBus is a widely accepted standard for smart meter communication in Europe. The radio supports all
WMBus modes per the latest draft specification of the EN13757-4 standard. This includes a much wider deviation
error tolerance of ±30% and frequency error tolerance of ±4 kHz, short preamble support (16-bit preamble for 2
and 4 level FSK modes), 3-of-6 encoding and decoding and 169 MHz N modes including N2g.
In addition, Silicon Labs has a production-ready wireless MBus stack available at no additional cost that supports
S, T, C, and N modes and runs on the EFM32 (32-bit ARM) family of energy friendly microcontrollers. This stack
and complete documentation including PHY configuration and test results are available for download from the
EZRadioPRO page at www.silabs.com.
9.2. ETSI EN300 220 Category 1
The radio is capable of supporting ETSI Category 1 applications (social alarms, healthcare applications, etc.) in the
169 MHz and 868 MHz bands under certain modem conditions. Blocking performance is improved at the 2 MHz
and 10 MHz offsets allowing for additional margin from the regulatory limits. The radio complies with ACS limits at
the 25 kHz offset in both, 169 MHz and 868 MHz bands. In the 169 MHz band, there is no need for an external
SAW filter for 2 MHz and 10 MHz blocking resulting in a lower system cost. In the 868 MHz band, an external SAW
filter is still required to meet the Cat 1 blocking limits. An RF Pico board is available for evaluation specifically for
ETSI Cat 1 applications.
Test conditions for ETSI Cat 1 specifications are different from the typical conditions and are stated below.
Data Rate: 3 kbps
Deviation: 2 kHz
Modulation: 2 GFSK
IF mode: Fixed and/or Scaled IF
RX bandwidth: 13 kHz
BER target: 0.1%
Blocker signal: CW
ETSI Cat 1 limits
±25 kHz ACS
±2 MHz blocking
±10 MHz blocking
RX sensitivity
Spurious response
54 dB
84 dB
84 dB
–107 dBm
35 dB
169 MHz band
(no SAW)
62 dB
88 dB
90 dB
–108 dBm
40 dB
868 MHz band
(no SAW)
58 dB
76 dB
82 dB
–108 dBm
40 dB
For further details on configuring the radio for ETSI Cat 1 applications, refer to the application notes available on
the Silicon Labs website.
44
Rev 1.0