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WM0831LIP Datasheet(PDF) 10 Page - Wolfson Microelectronics plc |
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WM0831LIP Datasheet(HTML) 10 Page - Wolfson Microelectronics plc |
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10 / 14 page  Wolfson Microelectronics 10 WM0831, WM0832 Pin Descriptions WM0831 Pin Name Type Function 1 CS Digital Chip Select (active low) 2 IN+ Analogue input Positive differential input 3 IN- Analogue input Negative differential input 4 GND Supply Analogue and digital ground 5VREF Analogue input Voltage reference input 6 DO Digital input Data Output 7 CLK Digital input Clock input 8VCC Supply Positive supply voltage WM0832 Pin Name Type Function 1 CS Digital Chip Select (active low) 2 CH0 Analogue input Channel 0 input to multiplexer (MUX) 3 CH1 Analogue input Channel 1 input to multiplexer (MUX) 4 GND Supply Analogue and digital ground 5 DI Digital input Data input 6 DO Digital input Data Output 7 CLK Digital input Clock input 8VCC/VREF Supply/Analogue I/P Positive supply voltage and voltage(ratiometric) reference input Multiplexer / Package Options Device Number of Analogue Channels Number of No Single Ended Differential Package Pins WM0831 1 1 8 WM0832 2 1 8 Functional Description Input and Multiplexer Operation and Addressing WM0831 has two inputs IN+ and IN- configured for differential operation, single ended operation is achieved by grounding IN- to an analogue common or GND. WM0832 uses an input multiplexer scheme with two input channels, configurable for single-ended or differential operation. The single ended input uses the GND pin as its analogue ground reference. WM0831/2 uses a successive approximation routine to perform A/D conversion and employs a sample data comparator structure which always performs conversion on a differential voltage. Conversion takes place on the voltage difference between assigned “+” and “-” inputs and the converter expects the “+” input to be the most positive, if the “+” input is more negative than “-” then the converter gives an all zeros output. Assignment of WM0832 inputs is made for a single-ended signal between an “+” input and (analogue) ground (GND), or for a differential input between CH0 and CH1 inputs of either polarity. For WM0832 prior to the start of every conversion the input configuration is assigned during the MUX addressing sequence by serially shifting data into the Data Input (DI) on the second and third rising edges of the clock input. The MUX address selects which analogue inputs are enabled, either single-ended or differential. For differential inputs the polarity of the inputs are also assigned. The MUX addressing table gives full details of input assignments. Because WM0831 has only one differential input of fixed polarity it does not require addressing. WM0832 MUX Addressing MUX Address Channel Number SGL/DIF ODD/EVEN 0 1 Differential MUX Mode 00 +- 01 -+ Single Ended MUX Mode 10 + 11 + |
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