Data Sheet

LMR14203

U1 3.3V

GND

VIN

5V3.3V

VIN

5V3.3V

GND

SHDN

VIN

GND

OUT

485A

485B

CANHI

CANLO

CTS

D2/INT0/SCL

D3/INT1/SDA

D9 D10

DTR

GND1

GND2

GND3

GND4

MISO/D12

MOSI/D11

RAW

RESET1 RESET

RXI

RXI1

SCK/D13

TXO

TXO1

VCC

VCC1

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Design by:

PAGE 1
3.3V 5V 3.3V 5V 3.3V 5V 5V 3.3V U1 5 4 2 VIN CB SHDN SW GND FB 1 6 IN OUT 3 EN LMR14203 GND GND GND GND NC GND GND VIN 5V 5V GND4 CTS VCC1 RXI1 TXO1 DTR VIN TXO RAW RXI GND2 RESET1 RESET GND1 VCC D2/INT0/SCL A3 D3/INT1/SDA A2 A1 D4 A0 D5 D6 SCK/D13 D7 MISO/D12 D8 MOSI/D11 D9 D10 CANHI CANLO GND3 GND 6 5 4 3 2 1 1 2 3 4 GND GND Released under the Creative Commons Attribution Share-Alike 4.0 License https://creativecommons.org/licenses/by-sa/4.
PAGE 2
3.3V 3.3V 3.3V GND 3.3V U2 1 30 29 3 4 11 17 GND GND 5 27 28 GND VDDA VDDA VDDD VDD3P3 VDD3P3 VDDPST VDDPST CHIP_EN EXT_RSTB LNA SPICS0/SD_CMD SPICLK/SD_CLK SPIQ/SD_DATA_0 SPID/SD_DATA_1 SPIHD/SD_DATA_2 SPIWP/SD_DATA_3 VDD_RTC U0RXD U0TXD XTAL_OUT SPICS2/GPIO0 GPIO2 GPIO4 GPIO5 XTAL_IN GND 31 RES12K MTDI/SPIQ/GPIO12 MTCK/SPID/GPIO13 MTMS/SPICLK/GPIO14 MTDO/SPICS/GPIO15 XPD_DCDC/GPIO16 EP GND TOUT/ADC 7 32 2 20 21 22 23 18 19 GND 25 26 GND GND 15 14 16 24 3.3V 3.