ATMEGA128 Embedded Board Main Features Atmega128 8-bit RISC CPU (AVR family) Serial EEPROM (I2C), 24LC256 Real Time Clock, DS1307 3V lithium battery keeping time and date 2 channels RS485 2 channels RS232 10-bit 8 channels on MCU providing variable resistor for reference voltage 10-bit 2 channels digital to analog providing variable resistor for reference voltage 6-pin ISP connector for ISP loader cable JTAG connector Reset switch Diode protection for power supply and reset 1. Introduction The EMB128 is designed by ERE CO., LTD. for embedded applications and development board. It supports rapid or no mass development of applications for ATMEGA128 AVR microcontroller from ATMEL by providing a multi-function hardware features. Also it is a second generation of the MEGABRAIN128. But it has more features than. Such as serial EEPROM size is 32KB, diode protection both power supply and reset pin, smaller components, new 6-pin ISP connector and the PCB is new designed for improving noise cancel. However its PCB size and pin connector are same as the MEGABRAIN128 so that it can be used as a replacement of the MEGABRAIN128 for the old user of MEGABRAIN128. 1. Pin Description The CON1, CON2, CON3 and CON4 connectors in figure 2-1 are referred from the schematic. So the users need to see the schematic simultaneously when reading this user s manual for more understanding the pin connector and how the circuit work. ere co., ltd. www.ere.co.th
Figure 2-1 pin connector location (top view) The pin numbers in figure 2-2 are counted by rows and columns. The columns are counted as the characters A to N and the rows are counted as numeric 1 to 14. www.ere.co.th Page 2 of 17 EMB128_051101A
! " # $ % & ' ( ) * +, -. / '0 '' '( ') '* Figure 2-2 pin location (top view) The table 2-1 is details of pin signals of EMB128. The first column is pin number referred from figure 2-2. The second column is pin signal name referred from the schematic and the last column is description of each pin. PIN Name Description A1 TX1 TX of RS232 line driver channel1 B1 B1 B(-) of RS485 line driver channel1 A2 RX1 RX of RS232 line driver channel1 B2 A1 A(+) of RS485 line driver channel1 A3 RX0 RX of RS232 line driver channel0 B3 TX0 TX of RS232 line driver channel0 A4 PEN PEN of Atmega128 B4 PE0 PE0/RXD0/PDI of Atmega128 A5 PE1 PE1/TXD0/PD0 of Atmega128 B5 PE2 PE2/XCK0/AIN0 of Atmega128 A6 PE3 PE3/OC3A/AIN1 of Atmega128 B6 PE4 PE4/OC3B/INT4 of Atmega128 A7 PE5 PE5/OC3C/INT5 of Atmega128 B7 PE6 PE6/T3/INT6 of Atmega128 A8 PE7 PE7/IC3/INT7 of Atmega128 B8 PB0 PB0/SS of Atmega128 A9 PB1 PB1/SCK of Atmega128 B9 PB2 PB2/MOSI of Atmega128 A10 PB3 PB3/MISO of Atmega128 B10 PB4 PB4/OC0 of Atmega128 A11 PB5 PB5/OC1A of Atmega128 B11 PB6 PB6/OCB of Atmega128 A12 NC No connect www.ere.co.th Page 3 of 17 EMB128_051101A
B12 NC No connect A13 GND Digital Ground B13 GND Digital Ground A14 GND Digital Ground B14 GND Digital Ground C13 GND Digital Ground C14 GND Digital Ground D13 PG3 PG3/TOSC2 of Atmega128 D14 PB7 PB4/OC0 of Atmega128 E13 RESET Reset pin of Atmega128 E14 PG4 PG4/TOSC1 of Atmega128 F13 GND Digital Ground F14 +5V power supply G13 XTAL1 XTAL1 of Atmega128 G14 XTAL2 XTAL2 of Atmega128 H13 PD1 PD1/SDA/INT1 of Atmega128 H14 PD0 PD0/SCL/INT0 of Atmega128 I13 PD3 PD3/TXD1/INT3 of Atmega128 I14 PD2 PD2/RXD1/INT2 of Atmega128 J13 PD5 PE5/XCK1 of Atmega128 J14 PD4 PD4/IC1 of Atmega128 K13 PD7 PD7/T2 of Atmega128 K14 PD6 PD6/T1 of Atmega128 L13 GND Digital Ground L14 GND Digital Ground M13 GND Digital Ground M14 GND Digital Ground N13 GND Digital Ground N14 GND Digital Ground M12 NC No Connect N12 NC No Connect M11 PG11 PG1/RD of Atmega128 N11 PG0 PG0/WR of Atmega128 M10 PC1 PC1/A9 of Atmega128 N10 PC0 PC0/A8 of Atmega128 M9 PC3 PC3/A11 of Atmega128 N9 PC2 PC2/A10 of Atmega128 M8 PC5 PC5/A13 of Atmega128 N8 PC4 PC4/A12 of Atmega128 M7 PC7 PC7/A15 of Atmega128 N7 PC6 PC6/A14 of Atmega128 M6 PA7 PA7/AD7 of Atmega128 N6 PG2 PG2/ALE of Atmega128 M5 PA5 PA5/AD5 of Atmega128 N5 PA6 PA6/AD6 of Atmega128 M4 PA3 PA3/AD3 of Atmega128 N4 PA4 PA4/AD4 of Atmega128 M3 GND Digital ground N3 GND Digital ground M2 AGND Analog ground for DAC N2 OUTA Analog output A of DAC M1 AGND Analog ground for DAC N1 OUTB Analog output B of DAC L1 NC No connect L2 NC No connect K1 PA2 PA2/AD2 of Atmega128 K2 PA1 PA1/AD1 of Atmega128 J1 PA0 PA0/AD0 of Atmega128 www.ere.co.th Page 4 of 17 EMB128_051101A
J2 +5V power supply I1 GND Digital ground I2 PF7 PF7/ADC7/TDI of Atmega128 H1 PF6 PF6/ADC6/TD0 of Atmega128 H2 PF5 PC0/ADC5/TMS of Atmega128 G1 PF4 PF4/ADC4/TCK of Atmega128 G2 PF3 PF3/ADC3 of Atmega128 F1 PF2 PF2/ADC2 of Atmega128 F2 PF1 PF1/ADC1 of Atmega128 E1 PF0 PF0/ADC0 of Atmega128 E2 AREF Analog voltage for referent voltage of ADC on Atmega128 D1 AGND Analog ground of Atmega128 D2 +5V power supply C1 B0 B(-) of RS485 line driver channel0 C2 A0 B(+) of RS485 line driver channel0 Table 2-1 pin description 2. Real Time Clock The real time clock in this board is driven by DS1307, 3V lithium battery and 32.768 KHz crystal. Also the board has a jumper for linking the SQW/OUT signal on DS1307 to interrupt pin on the Atmega128. The SQW/OUT signal is linked to the interrupt pin on the MCU where the JP8 is closed. That the users can control frequency of the SQW/OUT signal by sending some command into the DS1037. However the interrupt pin on the MCU can be used for other work where the JP8 is opened. Figure 3-1 RTC interrupt jumper 3. Serial EEPROM (I2C) In the MEGABRAIN128, the external EEPROM is 24LC16 that is not enough for a large data. So, in the EMB128, we provide the 24LC256 for external EEPROM that can store data up to 32 KB. Also we have added a jumper, JP7 for memory protection. Where the JP7 is close the WP pin of 24LC256 is connected to GND, which the 24LC256 allows both read and write operation. In opposite the write operation doesn t where the JP7 is opened. www.ere.co.th Page 5 of 17 EMB128_051101A
1 23 Figure 3-2 EEPROM jumper 4. RS232 Two channels RS232 are built in this board same as the MEGABRAIN128. Pin signals and jumpers about RS232 are compatible to the MEGABRAIN128 so the old user of MEGABRAIN128 can used RS232 on this board same as the RS232 on the MEGABRAIN128. The figure 5-1 shows pin signals of both channels RS232. www.ere.co.th Page 6 of 17 EMB128_051101A
! " # $ % & ' 45 ( 65 ) 65 45 * +, -. / '0 '' '( ') '* Figure 5-1 RS232 pin location (top view) Where the RS232 are used the user need to select the jumpers accordingly. The jumpers for RS232 are JP1 to JP5 which these jumpers are used both RS323 and RS485. Use these jumpers for RS232 see in figure5-3 and figure5-4. Select JP2 and JP5 same as in figure5-3 where channel0 of RS232 is used. Also in figure 5-4 shows the jumper selection of JP1 and JP4 for channel1 of RS232. 7 89 7 8: 7 8; 7 8< Figure 5-2 RS232 jumper location www.ere.co.th Page 7 of 17 EMB128_051101A
7 89 7 8: 7 8; 7 8< Figure 5-3 RS232 channel 0 Figure 5-4 RS232 channel 1 5. RS485 Pin signals of RS485 are shown in figure 6-1 that same as the MEGABRAIN128 s RS485 pins. Then the old users of MEGABRAIN128 can use this board instead of the MEGABRAIN128 same as the RS232. Where they are using this board the jumpers need to select accordingly. In figure 6-2 shows a method for select the jumper JP2 and JP5 for use channel0 of RS485. And in figure 6-3 shows JP1 and JP4 for use channel1 of RS485. www.ere.co.th Page 8 of 17 EMB128_051101A
! " # $ % & ' ( ) * +, -. / '0 '' '( ') '* Figure 6-1 RS485 pin location (top view) 7 89 7 8: 7 8; 7 8< Figure 6-2 channel0 of RS485 (top view) www.ere.co.th Page 9 of 17 EMB128_051101A
7 89 7 8: 7 8; 7 8< Figure 6-3 channel1 of RS485 (top view) Although this board is same as the MEGABRAIN128 but in this board it has a difference in RS485. It is JP3 and JP6 which are added in this board. Please simultaneously view the schematic where the JP3 and JP6 are used. These jumpers will short the RS485 direction lines to pull-low resistors when these jumpers are soldered. The figure 6-4 shows bottom view of the EMB128, showing the JP3 and JP6. Figure 6-4 RS485 jumper (bottom view) www.ere.co.th Page 10 of 17 EMB128_051101A
7. Digital To Analog The EMB128 is designed supports both digital and analog applications so the digital to analog is build on this board. The DAC on this board is 10-bit 2 channels, LTC1661 from Linear Technology. It is a serial DAC use only 3 wires for control. In figure 7-1 shows pin signals of DAC and its ground, AGND. The DAC has a pin for reference voltage that the user can adjust this voltage by trimming the VR on this board as shown in figure 7-2. Figure 7-1 DAC pin location www.ere.co.th Page 11 of 17 EMB128_051101A
Figure 7-2 VR for adjusting DAC VREF 8. In-System Programming Figure 8-1 ISP connector location www.ere.co.th Page 12 of 17 EMB128_051101A
The ISP connector on this board uses 6-pin connector, which compatible to ATMEL AVR programmer. In figure8-1 shows ISP connector on this board also in figure8-2 shows pin signals of ISP programming system. 9. JTAG Debugging Figure 8-2 ISP pin signals (top view) ABC D E F?? GE B F H = >? @ Figure 9-1 JTAG connector location Figure 9-2 JTAG pin signals (top view) www.ere.co.th Page 13 of 17 EMB128_051101A
10. Analog to Digital The analog to digital on this module is built in the MCU. It can be used up to 8 channels. Each channel has 10 bits for resolution. They can be adjusted the maximum voltage range by VR in figure10-2. Also in figure 10-1 shows necessary pins for using of the ADC, analog input pins, analog referent voltage pin and analog ground pin. Figure 10-1 ADC pin signals www.ere.co.th Page 14 of 17 EMB128_051101A
Figure 10-2 VR for adjustable ADC VREF 11. Reset The EMB128 provides a reset switch that the users can use this switch for manual reset. I JK JL M NL L O P Figure 11-1 reset button www.ere.co.th Page 15 of 17 EMB128_051101A
12. Power Supply The supply on this board used 5V. So the users need to supply 5V only. The board is damaged where the power supply is excess 5V supplies into the board. The board provides power supply pin as shows in figure 12-1. T P U T P U! " # $ % & ' ( ) * Q RS QRS +, -. / '0 '' T P U '( ') '* Q RS Figure 12-1 power supply pin www.ere.co.th Page 16 of 17 EMB128_051101A
1 2 3 4 5 6 D C PE0 PD2 PE1 PD3 JP1 JP2 JP4 JP5 PE6 PE5 U1 1 C1+ C1 3 C1-4 C2+ C3 5 C2-12 11 9 10 ROUT1 DIN1 ROUT2 DIN2 MAX232 JP6 R2 1 2 3 4 JP3 1 2 3 4 U3 RO RE DE DI SN75176 U2 RO RE DE DI SN75176 V+ V- RIN1 DOUT1 RIN2 DOUT2 B A B A 2 6 13 14 8 7 7 6 7 6 C5 C6 RX1 TX1 RX0 TX0 B0 A0 B1 A1 PF4 PF6 PF5 PF7 PE1 PB1 RESET TCK TDO TMS TDI MISO SCK AREF C15 10n J6 1 2 3 4 5 6 7 8 9 10 JTAG J1 1 2 3 4 5 6 ISP R5 MOSI C9 1u RESET PE0 R3 2.2 PG3 PG4 C12 10n PF0 PF1 PF2 PF3 PF4 PF5 PF6 PF7 PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 PD0 PD1 PD2 PD3 PD4 PD5 PD6 PD7 PE0 PE1 PE2 PE3 PE4 PE5 PE6 PE7 62 64 63 61 60 59 58 57 56 55 54 10 11 12 13 14 15 16 17 25 26 27 28 29 30 31 32 2 3 4 5 6 7 8 9 18 U4 AREF A AGND PF0 ( ADC0 ) PF1 ( ADC1 ) PF2 ( ADC2 ) PF3 ( ADC3 ) PF4 ( ADC4 / TCK) PF5 ( ADC5 / TMS ) PF6 ( ADC6 / TDO ) PF7 ( ADC7 / TDI ) PB0 ( SS ) PB1 ( SCK ) PB2 ( MOSI ) PB3 ( MISO ) PB4 ( OC0 ) PB5 ( OC1A ) PB6 ( OC1B ) PB7 ( OC2 / OC1C ) PD0 ( SCL / INT0 ) PD1 ( SDA / INT1 ) PD2 ( RXD1 / INT2 ) PD3 ( TXD1 / INT3 ) PD4 ( IC1 ) PD5 ( XCK1 / TXCAN) PD6 ( T1 / RXCAN ) PD7 ( T2 ) PE0 ( RXD0 / PDI ) PE1 ( TXD0 / PDO ) PE2 ( XCK0 / AIN0 ) PE3 ( OC3A / AIN1 ) PE4 ( OC3B / INT4 ) PE5 ( OC3C / INT5 ) PE6 (T3 / INT6 ) PE7 ( IC3 / INT7 ) PG3( TOSC2 ) Y3 32K768 19 PG4 ( TOSC1 ) PA0 ( AD0 ) PA1 ( AD1 ) PA2 ( AD2 ) PA3 ( AD3 ) PA4 ( AD4 ) PA5 ( AD5 ) PA6 ( AD6 ) PA7 ( AD7 ) PC0 ( A8 ) PC1 ( A9 ) PC2 ( A10 ) PC3 ( A11 ) PC4 ( A12 ) PC5 ( A13 ) PC6 ( A14 ) PC7 ( A15 ) PG2 ( ALE ) PG1 ( RD ) PG0 ( WR ) RESET 51 50 49 48 47 46 45 44 35 36 37 38 39 40 41 42 43 34 33 20 PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 PG2 PG1 PG0 R4 C10 10n D2 S1G RESET SW1 RX1 A1 A0 AREF PF1 PF3 PF5 PF7 PA1 RX0 PEN PE1 PE3 PE5 PE7 PB1 PB3 PB5 PA3 PA5 PA7 PC7 PC5 PC3 PC1 PG1 A2 B2 C2 E2 F2 G2 H2 I2 K2 L2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 M4 M5 M6 M7 M8 M9 M10 M11 M12 J3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 CON1 J2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 CON2 J5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 CON3 A1 B1 C1 E1 F1 G1 H1 J1 K1 L1 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 N1 N2 N4 N5 N6 N7 N8 N9 N10 N11 N12 TX1 B1 B0 PF0 PF2 PF4 PF6 PA0 PA2 TX0 PE0 PE2 PE4 PE6 PB0 PB2 PB4 PB6 OUTB OUTA PA4 PA6 PG2 PC6 PC4 PC2 PC0 PG0 D C B A 1 Y2 32K768 2 3 BT1 3V 1 2 3 U7 X1 X2 VBAT DS1307 U6 A0 A1 A2 24LC256 SQW/OUT SCL SDA WP SCL SDA 7 6 5 7 6 5 R1 R11 R10 JP7 R9 R8 JP8 D1 S1G PE7 PD0 PD1 C8 10u R6 C18 1u C19 10n PE4 PE2 PE3 4 1 2 3 C11 U5 REF CS/LD CLK DIN LTC1661 C14 1u 6 GND 7 C16 C20 VOUTA VOUTB C2 XTAL1 XTAL2 8 5 OUTA OUTB C4 C17 18p C13 18p C7 24 Y1 16MHz C21 23 R7 0 C22 XTAL1 XTAL2 ATMEGA128 PEN 1 PEN ERE CO., LTD. www.ere.co.th info@ere.co.th EMB128 PB7 PG4 XTAL2 PD0 PD2 PD4 PD6 D14 E14 G14 H14 I14 J14 K14 J4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 CON4 D13 E13 G13 H13 I13 J13 K13 PG3 RESET XTAL1 PD1 PD3 PD5 PD7 Size FCSM No. DWG No. Rev B EMB128_050915A A B A Scale Sheet 1 of 1 1 2 3 4 5 6 ere co., ltd. www.ere.co.th