UAA2022
UAA2022 is 16-Segment LED Driver manufactured by Motorola Semiconductor.
DESCRIPTION he -UAA2022 is intended to control mon anode ED’s and allows brightness Variation from an external ontrol voltage. Since it is not multiplexed it is particularly Jited for hi-fi applications etc. ‘he circuit receives 16 bit serial data by means of the igital inputs Vm (Chip select), Glock and Data (TTL:vels). The information is fed into a shift-register, and len is stored in latches which in turn control the output uffers. These output buffers (Segment driversl h a v e urrent Source characteristics (See figure 2a), thus no xternal resitors are needed to set up the Segment currents for 100 % luminosity). ‘igure 3 Shows the timing diagram of the circuit. On the negative going VOR-edge the latches are disconnected from the shift register and new information is shifted in. On the positive VDR-edge the latches are reconnected, thus transferring new...
