SM6453AB Datasheet, PDF (9/12 Pages) Nippon Precision Circuits Inc – 3-wire Serial Data Volume Control for Headphone Amplifiers IC

SM6453AB
FUNCTIONAL DESCRIPTION
Microcontroller Interface
The SM6453AB uses a serial microcontroller interface comprising MDT (data), MCK (clock), MLEN (latch
enable).
Data format
The data transfer format is shown in figure 1.
MDT
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
MCK
MLEN
Figure 1. Microcontroller data input timing
The internal shift register shifts data on the rising edge of MCK, and the data is loaded and updated on the ris-
ing edge of MLEN (the dotted lines are all valid data timing). Each cycle is completed by 16 or more MCK
input cycles, even if there are unused data bits.
NIPPON PRECISION CIRCUITS—9