28031 Parallax Inc, 28031 Datasheet - Page 9

• Manufacturer Part Number: 28031
• Description: ADAPTER USB TO SRL RS232 W/CABLE
• Manufacturer: Parallax Inc

Specifications of 28031

• Accessory Type: USB to RS232 Adapter
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Parallax Motherboards
• For Use With: 28136 - KIT SCRIBBLER ROBOT28138 - BOARD DEV PROFESSIONAL
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

DS1307 Real-Time-Clock (X14)
The DS1307 is a real-time-clock that also contains 56 bytes of battery-backed RAM.
Data transfer
2
between the host micro and the DS1307 is with the Philips I
C protocol which is directly supported by the
BS2p-family (with I2CIN and I2COUT), as well as the SX/B compiler (with I2CSTART, I2CSEND, I2CRECV,
and I2CSTOP). For other BASIC Stamp 2 members as well as the Javelin Stamp, I2C routines can be
synthesized using other instructions.
In addition to the SDA (serial data) and SCL (serial clock) connections, the SQW (programmable square
wave output) is provided at X14.
Using a Ceramic Resonator with the SX28AC/DP (Y1)
When programming and debugging an SX28AC/DP project the clock for the SX28AC/DP will be provided
by the SX-Key. For stand-alone testing, remove the SX-Key and install an appropriate 3-pin ceramic
resonator into socket Y1.
Board Dimensions
9” W x 5-1/4” H x ¾” D (23 cm x 13.5 cm x 2 cm)
Copyright © Parallax, Inc.
Professional Development Board (#28138)
v2.0 9/3/2008 Page 9 of 10