I just finished my NB1A board which has a DS1337 RTC (two time-of-day
interrupts and a battery backup) and a TI TLV5620 quad 8-bit DAC.
The schematics and board layout are in the datasheet. Also on the
website are four Arduino libraries and three application examples.
The libraries are
TWI ... code from AVR315 (cosmetic modifications)
SPI ... SPI interface
RTC ... code for the DS1337
DAC ... code for the TI TLV5620 DAC.
The examples are --
nb1a_dac_r0 ... initializes the TLV5620 and sets
nb1a_rtc_r0 ... setup for the DS1337 and outputs
date and time to the serial port
nb1a_rtc_alarm_r0 ... sets up alarm1 interrupt
on the DS1337. Outputs the string
"*** ALARM ***" when the interrupt
The documentation is sparse but I will be updating it over the next month.
(* jcl *)