#1 - Do not reference datasheets from 3rd party site. Always go to manufacturers web page for datasheet to ensure you have the very latest. The datasheet at SparkFun is not the latest. Use **broken link removed**
#2 Per above datasheet, if you don't have a battery on pin3, VBAT, then it MUST be GROUNDED. See page 6, "If a backup supply is not required, VBAT must be grounded".
#3 Per above datasheet, I don't think that you need external capacitors. See page 6, "The internal oscillator circuitry is designed for operation with a crystal having a specified load capacitance (CL) of 12.5pF". See Figure 2 on page 7, it doesn't show any capacitors attached to the crystal.
#4 VCC must be 4.5 to 5.5 volt.
#5 My comments in previous post was generic thoughts about crystals and batteries instead of targeting this specific chip.