MOD-WIFI-ESP8266-DEV, hardware revision B 1 3.3V 3.3V 3.3V R1 12k R13 12k L2 NA R14 12k U1 ESP8266 3.3V WIFI_ANT_ESP8266 R2 GPIO2 2 R12 NA(2k) R7 R8 R9 SDA 2k 2k 2k 3.3V 3.3V PWR R6 2k LED/Red/0603 R3 100k RXD SCL R17 R15 NA MTDO 2 1 3 5 7 9 2 4 6 8 10 SW1 SW-TAKTIT1185AU2 R11 3.3V R4 2k 200R U2 3.3V TXD LED/Green/0603 UEXT NA R10 2k 17 GPIO14 16 GPIO12 18 GPIO13 GPIO15 19 GPIO-2 20 GPIO-0 21 3.3V 1 0 22 GPIO4 GPIO4 GPIO0 GPIO2 MTDO 3 SCL 1 0 3.3V 3.3V GPIO16 15 GPIO0 3.3V SD_CMD SD_D3 SD_D2 3.3V D1 R16 NA SDA SJ1 1 NA(IDC10S/PCB) 2 TXD 8 200R C7 100nF SD_D3 3 DO/IO1 DI/IO0 GND CLK VCC /HOLD/IO3 /WP/IO2 /CS/ 5 SD_D1 6 SD_CLK 7 SD_D2 1 SD_CMD W25Q16BVSSIG close MOD-WIFI-ESP8266-DEV, hardware revision B OLIMEX LTD, PLOVDIV, BULGARIA www.OLIMEX.com 2 4 R5 NA(1N5819-S4) SD_D0 Revision changes in revision B: 1. 2. 3. 4. Default:1-2 SD_CLK 3 11 GPIO5 SD_D1 SD_D0 GPIO5 SD_D1 SD_D0 200R SD_CLK SD_CMD SD_D3 SD_D2 GPIO2 L1 NA 24 23 22 21 20 19 18 17 1 0 Default:1-2 14 CHIP_E NA 2 MTDO C6 GPIO0 6 10 8 5.6pF RTC GPIO5 SD_DATA_1 SD_DATA_0 SD_CLK SD_CMD SD_DATA_3 SD_DATA_2 VDDPST VDDA LNA VDD3P3 VDD3P3 VDD_RTC TOUT CHIP_EN XPD_DCDC MTMS MTDI VDDPST MTCK MTDO GPIO2 GPIO0 GPIO4 12 ADC 1 2 3 4 5 6 7 8 3.3V 9 10 11 12 13 14 15 16 RF_CON2 C5 EXT_RSTB RES12K VDDA VDDD XTAL_IN XTAL_OUT U0TXD U0RXD 2 open ANT 32 31 30 29 28 27 26 25 PAD GND SJ2 3 GPIO1 GPIO3 4 Added a button and filtering resistor R11 for easier acces to UART/bootloader mode Added pads for pull up resistor for GPIO4 that might be used as I2C, value of the resistor NA(2K). Improved jumper names. Added testpad for the RTC pin Default:2-3 TXD RXD 13 ANT_CON 1 MTDO GPIO0 GPIO2 1 X X 0 0 1 0 1 1 RSTB 1 100nF 1 10uF SDIO UART FLASH C2 10pF 3 C4 TSX-3225/26MHz/10PPM/7pF/3.2x2.5mm SMD 1 C3 GND GND 5 9 7 2 GND C1 10pF Q1 PAD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 PIN 3.3V GND GPIO1 GPIO3 SD_CLK SD_D2 SD_D1 SD_CMD SD_D0 SD_D3 GPIO5 ADC RSTB CHIP_E GPIO16 GPIO12 GPIO14 GPIO13 GPIO15 GPIO-2 GPIO-0 GPIO4