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2.3

Current consumption optimization

To optimize battery current consumption, it is possible to use a SMPS at 1.8 V to supply VCC.
Here is an application example with ST1S15J18R with an efficiency around 85%.

Figure 3. 

Example of SMPS to improve current consumption

1MΩ

4.7µF

V

IN

2.3V – 5.5V

470nH

ST1S15J18R

MODE

A1

SW

B1

FB

C1

V

IN

GND

C2

4.7µF

LQM21PNR47MC0D

B2

A2

EN

UM3004

Current consumption optimization

UM3004

 - 

Rev 1

page 4/17

Содержание Teseo-LIV4F

Страница 1: ...r which embeds the new ST GNSS positioning engine capable of receiving signals from multiple satellite dual bands L1 and L5 navigation systems including GPS Galileo and Glonass or BeiDou It embeds serial flash Teseo LIV4F Hardware documentation UM3004 User manual UM3004 Rev 1 March 2022 For further information contact your local STMicroelectronics sales office www st com ...

Страница 2: ... SCL PRTRG Main supply Reset GPIO General ground pin RF ground RF ground Antenna connexion 50 Ω Antenna supply I2C internal pull up Backup supply PPS UART Rx from MCU UART Tx to MCU 9 8 7 6 5 4 3 2 1 RESETn VCC VBATT EXTINT PPS UART_RX B0 UART_TX GND Reserved 10 11 12 13 14 15 16 17 18 Mode pin UM3004 Pin out UM3004 Rev 1 page 2 17 ...

Страница 3: ...can be either connected to VCC or it can be supply by a dedicated supply always ON VBAT supply can be kept ON during low power mode to allow fast recovery of GNSS fix If no backup supply is available leave VBAT pin floating 2 1 VCC_RF pin 14 VCC_RF is an output supply for external active antenna The current is limited below 35 mA 2 2 Power supply design reference For first PCB it is recommended to...

Страница 4: ... V to supply VCC Here is an application example with ST1S15J18R with an efficiency around 85 Figure 3 Example of SMPS to improve current consumption 1MΩ 4 7µF VIN 2 3V 5 5V 470nH ST1S15J18R MODE A1 SW B1 FB C1 VIN GND C2 4 7µF LQM21PNR47MC0D B2 A2 EN UM3004 Current consumption optimization UM3004 Rev 1 page 4 17 ...

Страница 5: ...3 Reserved pin 7 pin 13 and pin 15 In Teseo LIV4F pin 7 pin 13 and pin 15 are reserved Let the pin floating UM3004 Reserved pin 7 pin 13 and pin 15 UM3004 Rev 1 page 5 17 ...

Страница 6: ...nsmitter that supports much of the functionality of the industry standard 16C650 UART These UARTs vary from industry standard 16C650 on some minor points which are Receive FIFO trigger levels The internal register map address space and the bit function of each register differ The deltas of the modem status signals are not available 1 5 stop bits is not supported Independent receive clock feature i...

Страница 7: ...F under reset Reset signal is active low Host processor must have full control of this pin to guarantee the Teseo LIV4F s firmware upgrade support Do not use pull up or pull down when connecting to MCU 5 4 RF_IN pin 10 It is the RF input DC equals to VCC voltage is present Teseo LIV4F version 5 5 PRTRG pin 18 Keep PRTRG pin floating during system power up or the external reset RESETn from low to h...

Страница 8: ...t allows to have very low current consumption and fast GNSS reacquisition at the end of the standby time due to RTC Teseo LIV4F offers 1 way of standby HW standby As IO buffers are not supplied during standby mode it is important to keep all IO without external voltage to avoid any current leakage UM3004 Standby mode UM3004 Rev 1 page 8 17 ...

Страница 9: ...tching component must be necessary to match the antenna As RF_IN provides supply for antenna a DC cut capacitor could be necessary in case antenna presents a DC GND short cut Figure 4 Passive antenna LIV4F 10 11 12 13 14 15 16 17 18 9 8 7 6 5 4 3 2 1 RESETn VCC VBATT EXTINT PPS UART_RX B0 UART_TX GND GND RF RF IN GND RF Reserved VCC RF Reserved SDA SCL PRTRG Reserved 56pF UM3004 Front ends managem...

Страница 10: ...ed to use an LNA with gain less than 36 dB and noise figure less than 1 5 dB Here is a bloc diagram describing the connection Figure 5 External LNA control LNA VCC LIV4F 10 11 12 13 14 15 16 17 18 9 8 7 6 5 4 3 2 1 RESETn VCC VBATT EXTINT PPS UART_RX B0 UART_TX GND GND RF RF IN GND RF Reserved VCC RF Reserved SDA SCL PRTRG Reserved UM3004 External LNA UM3004 Rev 1 page 10 17 ...

Страница 11: ...gure less than 1 5 dB The active antenna can be supplied directly via RF_IN supply Figure 6 External antenna control Active Antenna LNA LIV4F 10 11 12 13 14 15 16 17 18 9 8 7 6 5 4 3 2 1 RESETn VCC VBATT EXTINT PPS UART_RX B0 UART_TX GND GND RF RF IN GND RF Reserved VCC RF Reserved SDA SCL PRTRG Reserved UM3004 Active antenna UM3004 Rev 1 page 11 17 ...

Страница 12: ...sing of 0402 1 x 0 5 mm components Please choose the RF ground layer to be able to get 50 Ω RF line width as close as possible to components pads On 50 Ω RF line it is important to avoid all possible stubs For parallel components place one pad on the RF line Figure 7 Parallel component pads position 50Ω line 50Ω line 50Ωline If a bypass is needed superimpose the two pads in one Figure 8 Bypass com...

Страница 13: ...Revision history Table 1 Document revision history Date Version Changes 22 Mar 2022 1 Initial release UM3004 UM3004 Rev 1 page 13 17 ...

Страница 14: ...5 4 Interfaces 6 4 1 I2C pin 16 pin 17 6 4 2 UART pin 2 pin 3 6 5 I O pins 7 5 1 PPS pin 4 7 5 2 EXTINT pin 5 7 5 3 RESETn pin 9 7 5 4 RF_IN pin 10 7 5 5 PRTRG pin 18 7 6 Standby mode 8 7 Front ends management 9 7 1 Passive antenna 9 7 2 External LNA 10 7 3 Active antenna 11 8 Layout recommendations 12 Revision history 13 UM3004 Contents UM3004 Rev 1 page 14 17 ...

Страница 15: ...List of tables Table 1 Document revision history 13 UM3004 List of tables UM3004 Rev 1 page 15 17 ...

Страница 16: ...xample of SMPS to improve current consumption 4 Figure 4 Passive antenna 9 Figure 5 External LNA control 10 Figure 6 External antenna control 11 Figure 7 Parallel component pads position 12 Figure 8 Bypass components pads position 12 UM3004 List of figures UM3004 Rev 1 page 16 17 ...

Страница 17: ...ts and ST assumes no liability for application assistance or the design of purchasers products No license express or implied to any intellectual property right is granted by ST herein Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product ST and the ST logo are trademarks of ST For additional information about ST...

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