Datasheet

Rev B Shield Pinouts

ICSP SCK - SPI clock

ICSP MISO - SPI MISO

ICSP MOSI - SPI MOSI

Digital #10 - SD Card chip select (can cut a trace to re-assign)

SDA not connected to A4

SCL not connected to A5

The RTC (PCF8523) logic level can be 3V or 5V

On an UNO, note that Digital #13 is the same as ICSP SCK, #12 is ICSP MISO, #11 is

ICSP MOSI, SDA is tied to A4 and SCL is A5. However, that is only true on the UNO! Other

Arduino's have different connections. Since the shield no longer makes the assumption it's

on an UNO, it is the most cross-compatible shield.

On the bottom of the Rev B shield, you can see that if you have an older Arduino where

there is no ICSP 2x3 header, and no SDA/SCL pins, you can short the solder jumpers

closed.