2003 Interfacing MAX1169 Microcontroller This application no

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2003 Interfacing MAX1169 Microcontroller This application no

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CONVERSION/SAMPLING CIRCUITS INTERFACE CIRCUITS MICROCONTROLLERS VOLTAGE REFERENCES
2003
Interfacing MAX1169 Microcontroller
This application note describes interface MAX1169 analog-to-digital converter (ADC) microcontroller. includes example circuit software PIC18F442. software contains function calls interface microcontroller using internal MSSP port 400kHz. MAX1169 16-bit, power featuring 2-Wire compatible serial interface. MAX1169's interface capable supporting both Fast Mode (400kHz) High Speed Mode 1.7MHz). This application note consists example application circuit software using PIC18F442. software contains function calls interface MAX1169 using internal MSSP port 400kHz. Since other microcontrollers have similar on-chip peripherals, example communication routines provided were purposely broken down into single function calls that code quickly implemented with other microcontrollers. Table shows single compatible function calls used assembly program example. application circuit uses MAX1169EVKIT, which consists MAX1169, input buffer (MAX4430) proven layout. RS232 transceiver (MAX3232) present MAX1169EVKIT. pads MAX1169EVKIT allow easy connection compatible serial interface. Install 1.5K pull-up resistors 400kHz operation. pinout MAX1169 allows easy isolation analog section from digital section. analog section grouped together pins 8-13 right side digital section located pins left side also part digital section easily grouped with left side optimum performance recommended separate analog digital supplies shown schematic Figure
Figure MAX1169 application schematic. Separate analog digital grounds shown Figure Connect both ground planes near MAX1169 through ferrite bead. Using ferrite bead such MMZ1608B601C connect both grounds prevents microcontroller's system clock harmonics from feeding into analog ground. MMZ1608B601C chosen specific impedance versus frequency characteristics knowing system clock PIC18F442 40MHz. Figure shows impedance versus frequency curve MMZ1608B601C.
Figure Separating analog digital grounds.
Figure Impedance versus frequency curve MMZ1608B601C ferrite bead. example assembly program reads continuous conversions from MAX1169 16-bit 2-Wire interface frequency 400kHz. Once digitized analog voltage representation data received PIC, immediately transmitted software UART 115kbps. RS232 transceiver allows data captured personal computer with standard serial port. Table Single compatible function calls.
Single compatible function calls
HWI2C_start
Description
Performs compatible start condition.
HWI2C_repeatedStart HWI2C_W_slaveAddr HWI2C_readMore_W HWI2C_readLast_W HWI2C_stop
Performs compatible repeated start condition. Performs compatible write operations including initial slave address write frame. Performs compatible read operation with Master ACK. Performs compatible read operation with Master NACK. Performs compatible stop condition.
Download assembly example program that interfaces MAX1169 PIC18F442's internal MSSP peripheral.
More Information MAX1169: QuickView Full (PDF) Data Sheet Free Samples MAX3232: QuickView Full (PDF) Data Sheet Free Samples MAX4430: QuickView Full (PDF) Data Sheet Free Samples

2003 Interfacing MAX1169 Microcontroller This application no

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