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UMTS/HSPA Module Series

UC20 Hardware Design

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3.9. RTC Backup

The RTC (Real Time Clock) can be powered by an external power source through the pin VRTC when the

module is powered down and there is no power supply for the VBAT. It is also available to charge the

battery on the VRTC when module is turned on. You can choose rechargeable battery, capacitor or

non-rechargeable battery depending on different applications.

The following figures show the various sample circuits for VRTC backup.

Module

RTC

Core

VRTC

Non-chargeable
Battery

Figure 16: RTC Supply from Non-chargeable Battery

Rechargeable
Battery

Module

RTC

Core

VRTC

Figure 17: RTC Supply from Rechargeable Battery

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Summary of Contents for UC20

Page 1: ...UC20 Hardware Design UMTS HSPA Module Series Rev UC20_Hardware_Design_V1 4 Date 2014 10 22 www quectel com Downloaded from Arrow com...

Page 2: ...MERS REQUIREMENTS QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN AND DOES NOT ACCEPT A...

Page 3: ...of transistor circuit on UART interface 5 Deleted debug function of Debug UART interface 6 Released AP_READY main UART upgrade function and Rx diversity function 7 Modified UC20 A frequency bands 8 M...

Page 4: ...USB driver 2 Updated VBAT input voltage range 3 Updated Chapter 3 6 2 and added VBAT drop figure 4 Updated antenna requirement in Chapter 5 3 1 5 Updated current consumption 6 Updated recommended foo...

Page 5: ...tion 26 3 5 1 3 USB Application without Suspend Function 26 3 5 2 Airplane Mode 27 3 6 Power Supply 28 3 6 1 Power Supply Pins 28 3 6 2 Decrease Voltage Drop 28 3 6 3 Reference Design for Power Supply...

Page 6: ...tenna with RF Connector 59 6 Electrical Reliability and Radio Characteristics 61 6 1 Absolute Maximum Ratings 61 6 2 Power Supply Ratings 61 6 3 Operating Temperature 62 6 4 Current Consumption 62 6 5...

Page 7: ...DICATOR 48 TABLE 19 PIN DEFINITION OF STATUS 49 TABLE 20 PIN DEFINITION OF SLEEP_IND 50 TABLE 21 BEHAVIOR OF THE RI 51 TABLE 22 GNSS PERFORMANCE 53 TABLE 23 PIN DEFINITION OF THE RF ANTENNA 55 TABLE 2...

Page 8: ...39 FIGURE 21 RS232 LEVEL MATCH CIRCUIT 40 FIGURE 22 REFERENCE CIRCUIT OF THE 8 PIN USIM CARD 41 FIGURE 23 REFERENCE CIRCUIT OF THE 6 PIN USIM CARD 42 FIGURE 24 REFERENCE CIRCUIT OF USB APPLICATION 43...

Page 9: ...IEW OF THE MODULE 72 FIGURE 44 BOTTOM VIEW OF THE MODULE 72 FIGURE 45 LIQUIDS TEMPERATURE 74 FIGURE 46 CARRIER TAPE 75 Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Dow...

Page 10: ...you quickly understand module interface specifications electrical and mechanical details Associated with application notes and user guide you can use UC20 module to design and set up mobile applicatio...

Page 11: ...wireless device when in hospitals or clinics or other health care facilities These requests are desinged to prevent possible interference with sentitive medical equipment Cellular terminals or mobiles...

Page 12: ...ation of UC20 series Table 1 UC20 Series Frequency Bands 1 UC20 series UC20 A UC20 E UC20 G includes Data only and Telematics versions Data only version does not support voice function Telematics vers...

Page 13: ...bps Transmitting Power Class 4 33dBm 2dB for GSM850 and EGSM900 Class 1 30dBm 2dB for DCS1800 and PCS1900 Class E2 27dBm 3dB for GSM850 and EGSM900 8 PSK Class E2 26dBm 3 4dB for DCS1800 and PCS1900 8...

Page 14: ...the master in long frame sync UART Interface Support two UART interfaces main UART interface and debug UART interface Main UART interface Seven lines on main UART interface Support RTS and CTS hardwar...

Page 15: ...k Implemented Network Indication Two pins including NET_MODE and NET_STATUS to indicate network connectivity status Antenna Interface Include main GSM UMTS antenna UMTS diversity antenna and GNSS ante...

Page 16: ...pplications with UC20 Quectel supplies an evaluation board EVB RS 232 to USB cable USB data cable power adapter earphone antenna and other peripherals to control or test the module For details please...

Page 17: ...rs Power supply UART interface USIM interface USB interface PCM interface ADC interface Status indication Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from...

Page 18: ...ADC1 RESERVED I2C_SDA I2C_SCL RESERVED RESERVED RESERVED RESERVED ADC0 GND GND GND 73 74 75 76 77 78 79 80 81 82 83 84 100 101 102 106 107 111 112 103 104 109 105 110 89 94 98 88 93 97 86 91 96 85 90...

Page 19: ...RF part Vmax 4 3V Vmin 3 3V Vnorm 3 8V It must be able to provide sufficient current in a transmitting burst which typically rises to 2 0A VRTC 18 IO Power supply for internal RTC circuit VOmax 3 25V...

Page 20: ...en NET_MODE 5 DO Indicate the module network registration mode VOHmin 1 35V VOLmax 0 45V 1 8V power domain If unused keep it open NET_ STATUS 6 DO Indicate the module network activity status VOHmin 1...

Page 21: ...VOLmax 0 45V VOHmin 1 35V For 3 0V USIM VILmax 1 0V VIHmin 1 95V VOLmax 0 45V VOHmin 2 55V Pull up to USIM_VDD with 15k resistor internally USIM_CLK 16 DO Clock signal of USIM card For 1 8V USIM VOLma...

Page 22: ...keep it open RTS 65 DI Request to send VILmin 0 3V VILmax 0 6V VIHmin 1 2V VIHmax 2 0V 1 8V power domain If unused keep it open DTR 66 DI Data terminal ready sleep mode control VILmin 0 3V VILmax 0 6V...

Page 23: ...8V power domain If unused keep it open PCM_SYNC 26 IO PCM data frame sync signal VOLmax 0 45V VOHmin 1 35V VILmin 0 3V VILmax 0 6V VIHmin 1 2V VIHmax 2 0V 1 8V power domain In master mode it is an ou...

Page 24: ...default In low level voltage module can enter into airplane mode If unused keep it open AP_READY 2 DI Application processor sleep state detection VILmin 0 3V VILmax 0 6V VIHmin 1 2V VIHmax 2 0V 1 8V p...

Page 25: ...as registered to the UMTS network and the module is ready to send and receive data UMTS Talk Data UMTS connection is ongoing In this mode the power consumption is decided by network setting e g TPC pa...

Page 26: ...and AT QSCLK 1 to enable the sleep mode Drive DTR to high level The following figure shows the connection between the module and application processor RXD TXD RI DTR AP_READY TXD RXD EINT GPIO GPIO Mo...

Page 27: ...l be woken up 3 5 1 3 USB Application without Suspend Function If application processor communicates with module via USB interface and processor does not support USB suspend function you should discon...

Page 28: ...e The W_DISABLE pin is pulled up by default drive it to low level will let the module enter into airplane mode Software Command AT CFUN provides the choice of the functionality level fun 0 1 4 AT CFUN...

Page 29: ...9 36 46 48 50 54 56 72 85 112 Ground 0 V 3 6 2 Decrease Voltage Drop The power supply range of the module is 3 3V 4 3V Make sure the input voltage will never drop below 3 3V If the voltage drops below...

Page 30: ...ar structure of the power supply Module VBAT_RF VBAT_BB VBAT C1 100uF C6 100nF C7 33pF C8 10pF C2 100nF C5 100uF C3 33pF C4 10pF D1 5 1V Figure 7 Star Structure of the Power Supply 3 6 3 Reference Des...

Page 31: ...ristics Comment PWRKEY 21 Turn on off the module VIHmax 2 1V VIHmin 1 3V VILmax 500mV Pull up to 1 8V internally with 200k resistor When UC20 is in power down mode it can be turned on to normal mode b...

Page 32: ...re Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from...

Page 33: ...will execute power down procedure after PWRKEY is released The power down scenario is illustrated as the following figure NOTE Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow...

Page 34: ...document 1 for details about the AT command of AT QPOWD 3 7 2 3 Automatic Shutdown The module will constantly monitor the voltage applied on the VBAT if the voltage 3 5V the following URC will be pres...

Page 35: ...mmended circuit is similar to the PWRKEY control circuit You can use open drain collector driver or button to control the RESET_N NOTE Downloaded from Arrow com Downloaded from Arrow com Downloaded fr...

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Page 38: ...n No I O Description Comment RI 62 DO Ring indicator 1 8V power domain DCD 63 DO Data carrier detection 1 8V power domain CTS 64 DO Clear to send 1 8V power domain NOTE Downloaded from Arrow com Downl...

Page 39: ...e shows the reference design Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from...

Page 40: ...slator and a RS 232 level translator chip must be inserted between module and PC since these two UART interfaces do not support the RS 232 level while support the 1 8V CMOS level only Downloaded from...

Page 41: ...SIM interface requirements Both 1 8V and 3 0V USIM cards are supported Table 12 Pin Definition of the USIM Interface Pin Name Pin No I O Description Comment USIM_VDD 14 PO Power supply for USIM card E...

Page 42: ...ed as the following figure NOTE Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded f...

Page 43: ...rs are used for filtering interference of EGSM900 Please note that the USIM peripheral circuit should be close to the USIM connector The pull up resistor on USIM_DATA line can improve anti jamming cap...

Page 44: ...re 24 Reference Circuit of USB Application In order to ensure the USB interface design corresponding with the USB 2 0 specification please comply with the following principles Downloaded from Arrow co...

Page 45: ...o design which supports the following modes Primary mode short sync works as both master and slave Auxiliary mode long sync works as master only NOTE Downloaded from Arrow com Downloaded from Arrow co...

Page 46: ...27 Auxiliary Mode Timing Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arr...

Page 47: ...FS DACIN ADCOUT SCLK SDIN BIAS MIC_BIAS MIC MIC SPKOUT SPKOUT Figure 28 Reference Circuit of PCM Application with Audio Codec Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow...

Page 48: ...Offset Error 3 5 Gain Error 2 5 NOTES Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downl...

Page 49: ...ndicator Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloade...

Page 50: ...of SLEEP_IND Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Down...

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Page 53: ...nces with 1Hz via USB interface by default By default UC20 GNSS engine is switched off it has to be switched on with AT command For more details about GNSS engine technology and configurations refer t...

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