User Manual

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3.0.9 Inputs: Every bitSnap input must have a series 10K current
limiting resistor on the SIG line (see Figure 2).
3.0.10 Inputs: Every bitSnap input must have a shunt TVS diode, or
equivalent ESD countermeasures (see Figure 2).
3.0.11 Inputs: Floating bitSnap inputs are not permitted. For this reason,
every input needs to have a pull-down, pull-up, or reference
network. To maintain high input impedance, this network must
usually be greater or equal to 1 M. In most cases, this will
consist of a single 1 M pull-down resistor, which keeps the input
at ground potential if the input is not connected. The second most
common configuration will have a 1 M pull-up.
3.0.12 Preferred Parts. littleBits recommends the use of specific part
numbers for typical functions such as opamps, switches,
potentiometers, and others. A list of these preferred parts can be
found in libraries/lbPreferredParts.xlsx
4.0.0 Preparations
4.0.1 Download and install the following from the HDK-eagle-templates-
libraries repository
Parts Libraries:
libraries/LITTLEBITS140915.lbr
Design Rules Files:
libraries/littleBitsDRC_140813.dru //for 2-layer boards
libraries/littleBits4-LAYERDRC_140813.dru //for 4-layer