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6 5 4 3 2 1 Power Suppply and UART Circuit D For 3.3V MCU Customer's MCU VCC_MCU_3.3V RXD RXD_MCU TXD TXD_MCU 10K Q102 MCU_ON/OFF R104 RXD_MCU For 5V MCU R103,R104 are resrved for debugging the waveform of UART, and they are also beneficial to ESD protection. DTC143ZEBTL RXD_MCU RXD GND XC6209E332MR MCU_ON/OFF 4 R106 4.7K 1K NC CE C106 MCU_ON/OFF GND R105 GPIO_X 3 MCU R108 4.7K RXD1_MODULE TXD_MCU B R110 4.7K R109 4.7K RXD_MCU TXD1_MODULE Q104 Q103 TXD_MCU TXD R107 4.7K VCC_MODULE_3.3V VCC_MODULE_3.3V 5 D102 FORCE_ON 100nF VOUT C105 GPIO_X 100uF 2 100nF GPIO_RESET C104 4.7uF GPIO_X + C103 U102 VIN VCC_MCU_5V U103 1 VCC_MCU_5V VCC_MODULE_3.3V VCC_MCU_5V Customer's MCU VCC C Level Shifting for UART LDO Circuit VCC_MCU_5V TXD1_MODULE Generally,100R for R103 and R104 is recommended,but 0R also works well. MCU B 100R 1K MCU_ON/OFF C102 GPIO_X R101 R102 FORCE_ON 100nF GPIO_X RXD1_MODULE 100R VCC_MODULE_3.3V SI2333DS D101 GPIO_RESET C101 GPIO_X GND C R103 TXD_MCU 4.7uF VCC UART Circuit Power ON/OFF Circuit Q101 U101 VCC_MCU_3.3V l e t l c a e i t u n Q ide f n o C D The transistor circuit will realize the voltage level shifting between VCC_MCU_5V and VCC_MODULE_3.3V, and block the leakage current from one power-on device to another power-off device. Quectel Wireless Solutions A DRAWN BY <King HAO> CHECKED BY <Ray XU> 6 5 4 3 2 PORJECT <L26> SIZE TITLE <L26_Reference_Design> VER <1.01> A2 SHEET 1 of 3 <2013.05> 1 A 6 5 4 3 2 1 l e t l c a e i t u n Q ide f n o C Module Interface D Module Interface Test Points U201 ANTON R203 R204 TXD1_MODULE RXD1_MODULE V_BCKP VCC_MODULE_3.3V C C201 C202 10uF 100nF NM NM 13 14 15 16 17 18 19 20 21 22 23 24 GND ANT_ON RESERVED RESERVED NC RESERVED RESERVED TXD1 RXD1 V_BCKP VCC GND GND RF_IN GND VCC_RF RESET NC V_ANT AADET_N RESERVED 1PPS NC FORCE_ON 12 11 10 9 8 7 6 5 4 3 2 1 RF_IN VCC_RF RESET L26_TXD1 TXD1_MODULE L26_RXD1 RXD1_MODULE L26_VCC GND V_ANT AADET_N VCC_MODULE_3.3V GND 1. UART1 can be used to output NMEA message as well as to upgrade firmware. 1PPS C 2. R203,R204 are reserved to modify baud rate for future. FORCE_ON Keep R203,R204 unmounted in L26 module. L26 3. The test points are reserved for module debugging. Indicating Circuit VCC_MODULE_3.3V D Charging Circuit for RTC logic Reset Circuit RESET D202 VCC_MODULE_3.3V B RB520S30T1G Schottky Diode D201 GPIO_RESET R201 1K 1PPS Q202 V_BCKP DTC143ZEBTL Q201 DTC143ZEBTL The 1PPS indicator will blink at 1Hz frequency after fixing the position. B 1K R202 B201 XH414 C203 4.7uF C204 100nF 1. If the reset function is unused, the RESET pin can be connected to the VCC directly. V_BCKP is designed to supply power for L26 RTC 2. RESET has been pulled up internally. logic circuit when VCC_MODULE_3.3V is powered off. Quectel Wireless Solutions A DRAWN BY <King HAO> CHECKED BY <Ray XU> 6 5 4 3 2 PORJECT <L26> SIZE A2 SHEET 2 of 3 TITLE <L26_Reference_Design> VER <1.01> <2013.05> 1 A 6 5 4 3 2 1 Antenna Interface D l e t l c a e i t u n Q ide f n o C Active Antenna Passive Antenna D Reference Design for Detection Circuit Active Antenna R301 J302 Passive Antenna RF_IN C304 R303 22R VCC_RF C305 NM NM C302 J301 0R R304 330R C306 V_ANT 2.2uF RF_IN Q301 56pF C301 C303 NM NM The most simplified power supply circuit is as follows: C VCC_RF R302 10R 2 1 2SA1037AKT146 2SA1037AKT146 R306 10K R305 10K Q302 C R307 1K AADET_N V_ANT 3 1. Fig.1 shows the passive antenna circuit, here, Pi circuit (C301,C302,C303) is reserved for impedance matching for antenna. Reference Design for ANTON Circuit By default, C301 and C303 are not mounted, C302 is 56pF. 2. Fig.2 shows the basic active antenna circuit, here, Pi circuit (C304,R301,C305) is reserved for impedance matching for antenna. By default, C304 and C305 are not mounted, R301 is 0R. A 10R resistor (R302) is needed between VCC_RF and V_ANT to supply Q303 R309 VCC_RF 10R B R308 10K SI2333 V_ANT power. When use active antenne, the R301 must not be capacitance, because the current flows through R301 to the antenna. 3. Fig.3 shows the reference design for detection circuit.When active antenna is removed or not connected well, AADET_N will keep B a high level to indicate the active antenna absent. AADET_N will change to a low level when active antenna is connected well. 4. Fig.4 shows the active antenna with ANTON circuit. The voltage level of ANTON will be pulled down in sleep mode. ANTON Q304 5. The typical value of VCC_RF is 3.3V, ranging from 2.8V to 4.3V. If it is not suitable for the active antenna, it can be replaced by an external LDO. DTC143ZEBTL 6. Impedance of RF trace should be controlled by 50 ohm and the length should be kept as short as possible. For more details, please refer to L26 Hardware Design. 4 Quectel Wireless Solutions A DRAWN BY <Rain Zhou> CHECKED BY <David WEI> 6 5 4 3 2 TITLE <L26_Reference_Design> PORJECT <L26> SIZE SHEET A2 3 of 3 VER <V1.01> <2013.05> 1 A