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Sim28 Reference Design With Passive Antenna(saw+lna+saw)

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5 6 4 1 2 3 D D SIM28 reference design with passive antenna for best performance and increased immunity to jammers such as GSM VCC_RF U101 RXD1 TXD NC1 RXD EINT0 GND GND 1 5 SHDN GND 2 Passive antenna 8 7 C1 6 1uF (2.3V--4.3V) 2 22 23 24 V_BACKUP TIMEMARK VCC SCS GND3 NC0 C 2 GND U102 6 RFOUT SAFEB1G57KE0F00R14 U103 SAFEB1G57KE0F00R14U104 10nF J102 4 VCC %,$6 RFIN 3 L101 5.6nH 4 OUT 5 IN 1 1 Optional SMA_A RF GND 5 GND 4 GND 3 GND 2 SCL C101 4 TVS6 3 2 C2 1 1uF R205 1K D203 2 VGPS_3V3 1 LED-1 3 B101 2 D201 4.7UF 1 1 2 TVS2 LED-1C104 TXD1 VCC_RF 9 1 2 21 D1 1 RB521S-30 VGPS_3V3 NC4 SDA 10 IN 5 R3 100R RXD NC5 OUT 1 20 VCC_RF 4 GND R2 100R TXD SCLK R1 0R GND 19 GND0 11 2 18 MISO BGU7005 12 GND 17 RF_IN 3 TVS4 TVS3 16 GND1 MOSI GND 15 SIM28 Module 3 C GND2 5 14 TVS5 13 SAFEB1G57KE0F00R14 U103 SAFEB1G57KE0F00R14U103 DTC143ZE 2 B R207 B Q201 1 1K Note: 1. SIM28 does not support charging function to the backup battery, if a rechargable backup battery used,customer should design the charge circuit. 2. The load-cap of TVS6 should be less than 5pF(Optional) SIM Technology A DRAWN BY PROJECT A TITLE SIM28 REF design CHECKED BY SIZE VER SHEET 6 5 4 3 2 1