MAX192 Low-Power, 8-Channel, Serial 10-Bit ADC - Robotics UWA

Low-Power, 8-Channel,Serial 10-Bit ADCMAX192ANALOG INPUTS1 CH0V 20 DD2 CH13 CH24 CH35 CH4MAX192SCLK 19CS 18DIN 17SSTRB 160.1µF4.7µF+5VV DDI , V DDE , V DDSYN , V STBYSCKPCS0 MC68HC16MOSI6CH5DOUT15MISO7CH6DGND148CH7AGND139AGNDREFADJ1210SHDNVREF110.1µF+ 4.7µF0.01µFV SSIV SSE* CLOCK CONNECTIONS NOT SHOWNFigure 19. MAX192 QSPI ConnectionTMS320 to MAX192 InterfaceFigure 22 shows an application circuit to interface theMAX192 to the TMS320 in external clock mode. Thetiming diagram for this interface circuit is shown inFigure 23.Use the following steps to initiate a conversion in theMAX192 and to read the results:1) The TMS320 should be configured with CLKX(transmit clock) as an active-high output clock andCLKR (TMS320 receive clock) as an active-highinput clock. CLKX and CLKR of the TMS320 aretied together with the SCLK input of the MAX192.2) The MAX192 – C — S – is driven low by the XF_ I/O portof the TMS320 to enable data to be clocked intoDIN of the MAX192.3) An 8-bit word (1XXXXX11) should be written to theMAX192 to initiate a conversion and place thedevice into external clock mode. Refer to Table 3to select the proper XXXXX bit values for your specificapplication.4) The SSTRB output of the MAX192 is monitored viathe FSR input of the TMS320. A falling edge onthe SSTRB output indicates that the conversion isin progress and data is ready to be received fromthe MAX192.5) The TMS320 reads in one data bit on each of thenext 16 rising edges of SCLK. These data bitsrepresent the 10-bit conversion result and twosub-LSBs, followed by four trailing bits, whichshould be ignored.6) Pull – C — S – high to disable the MAX192 until the nextconversion is initiated.20 ______________________________________________________________________________________