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EA9777-2USB Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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7 / 33 page EAeDIPTFT32-A Page 7 ELECTRONIC ASSEMBLY reserves the right to change specifications without prior notice. Printing and typographical errors reserved. application example I²C-BUS INTERFACE If the display is wired as shown below, it can be operated directly on an I²C bus. 8 different base addresses and 8 slave addresses can be selected on the display. Data transfer is possible at up to 100 kHz. However, if pauses of at least 100 µs are maintained between the individual bytes during transfer, a byte can be transferred at up to 400 kHz. DATA TRANSFER I²C INTERFACE principle I2C-bus transfer: - I²C-Start - Master-Transmit: EA eDIP-I²C-address (e.g. $DE), send smallprotocol package (data) - I²C-Stop - I²C-Start - Master-Read: EA eDIP-I²C-Address (e.g. $DF), read ACK-byte and opt. smallprotocoll package (data) - I²C-Stop Read operation: for internal operation the EA eDIP does need a short time before providing the data; therefore a short pause of min. 6µs is needed for each byte (no activity of SCL line). Note: The pins DORD, CPOL, CPHA, DPOM, DPROT and TEST/SBUF have an internal pullup, which is why only the LO level (0=GND) is to be actively applied. These pins must be left open for a Hi level. On pin 20 (SBUF) the display indicates with a low level that data is ready to be retrieved from the internal send buffer. The line can be connected to an interrupt input of the host system, for example. Pinout eDIPTFT32-A: I2C mode Pin Symbol In/Out Function Pin Symbol In/Out Function 1 GND Ground Potential for logic (0V) 21 GND Ground (=Pin 1) 2 VDD Power supply for logic (+3,3V ... +5V) 22 VDD Power supply (=Pin 2) 3 NC do not connect 23 AIN1 In analogue input 0..VDD DC impedance 1MOhm 4 NC do not connect 24 AIN2 5 RESET In L: Reset 25 OUT1 / MO8 Out 8 digital outputs maximum current: IOL = IOH = 10mA alternativ up to 8 matrix keyboard output lines (reduces the digital output lines, see chapter external keyboard) 6 BA0 In Basic Address 0 26 OUT2 / MO7 7 BA1 In Basic Address 1 27 OUT3 / MO6 8 SA0 In Slave Address 0 28 OUT4 / MO5 9 SA1 In Slave Address 1 29 OUT5 / MO4 10 SA2 In Slave Address 2 30 OUT6 / MO3 11 BA2 In Basic Address 2 31 OUT7 / MO2 12 I2CMO In connect to GND for I²C interface 32 OUT8 / MO1 13 DPOM In L: disable PowerOnMacro do not connect for normal operation 33 IN1 / MI8 In 8 digital inputs open-drain with internal pullup 20..50k alternativ up to 8 matrix keyboard input lines (reduces the digital input lines, see chapter external keyboard) 14 SDA Bidir. Serial Data Line 34 IN2 / MI7 15 SCL In Serial Clock Line 35 IN3 / MI6 16 BUZZ Out Buzzer output 36 IN4 / MI5 17 DPROT In L: Disable Smallprotokoll do not connect for normal operation 37 IN5 / MI4 18 DNC Out L: internal, do not connect 38 IN6 / MI3 19 WP In L: Writeprotect for DataFlash 39 IN7 / MI2 20 TEST SBUF IN Out open-drain with internal pullup 20..50k IN (Power-On) L: Testmode OUT L: data in sendbuffer 40 IN8 / MI1 all pins open: Write $DE Read $DF I²C - Address Pin 11,7,6 Base address I²C address BA2 BA1 BA0 D7 D6 D5 D4 D3 D2 D1 D0 L LL $10 0 00 1 S A 2 S A 1 S A 0 R W L L H $20 0 0 1 0 L H L $30 0 0 1 1 L H H $40 0 1 0 0 H L L $70 0 1 1 1 H LH $90 1 00 1 H H L $B0 1 0 1 1 H H H $D0 1 1 0 1 |
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