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MAX518ACSA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX518ACSA Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 16 page 2-Wire Serial 8-Bit DACs with Rail-to-Rail Outputs _______________________________________________________________________________________ 7 Figure 1. MAX517/MAX519 Functional Diagram _______________Detailed Description Serial Interface The MAX517/MAX518/MAX519 use a simple 2-wire serial interface requiring only two I/O lines (2-wire bus) of a standard microprocessor (µP) port. Figure 2 shows the timing diagram for signals on the 2-wire bus. Figure 3 shows a typical application. The 2-wire bus can have several devices (in addition to the MAX517/ MAX518/MAX519) attached. The two bus lines (SDA and SCL) must be high when the bus is not in use. When in use, the port bits are toggled to generate the appropriate signals for SDA and SCL. External pull-up resistors are not required on these lines. The MAX517/MAX518/ MAX519 can be used in applications where pull-up resis- tors are required (such as in I2C systems) to maintain compatibility with existing circuitry. The MAX517/MAX518/MAX519 are receive-only devices and must be controlled by a bus master device. They operate at SCL rates up to 400kHz. A master device sends information to the devices by transmitting their address over the bus and then transmitting the desired information. Each transmission consists of a START condition, the MAX517/MAX518/MAX519’s programm- able slave-address, one or more command-byte/out- put-byte pairs (or a command byte alone, if it is the last byte in the transmission), and finally, a STOP condition (Figure 4). ______________________________________________________________Pin Description PIN MAX517 MAX518 MAX519 NAME FUNCTION 1 1 1 OUT0 DAC0 Voltage Output 2 2 4 GND Ground — — 5 AD3 Address Input 3; sets IC’s slave address 3 3 6 SCL Serial Clock Input 4 4 8 SDA Serial Data Input — — 9 AD2 Address Input 2; sets IC’s slave address 5 5 10 AD1 Address Input 1; sets IC’s slave address 6 6 11 AD0 Address Input 0; sets IC’s slave address 7 7 12 VDD Power Supply, +5V; used as reference for MAX518 — — 13 REF1 Reference Voltage Input for DAC1 8 — 15 REF0 Reference Voltage Input for DAC0 — 8 16 OUT1 DAC1 Voltage Output — — 2, 3, 7, 14 N.C. No Connect—not internally connected. INPUT LATCH 0 OUTPUT LATCH 0 START/STOP DETECTOR DAC0 INPUT LATCH 1 8-BIT SHIFT REGISTER OUT0 REF0 (REF1) (OUT1) MAX517/MAX519 DECODE ADDRESS COMPARATOR DAC1 OUTPUT LATCH 1 VDD SCL SDA AD0 (AD2) AD1 (AD3) GND MAX519 ONLY ( ) ARE FOR MAX519 |
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