EA uniTFTs Series

Pin

Symbol

I/O

Description

1

GND

Ground 0 V

2

VDD

Power Supply 3.3 V

Power supply or 3.3V output at USB operation (max. 20mA)

3

RES

I

Reset

internal Pull-Up: (10..75 kΩ)

4

CS

I

SPI: Chip Select

internal Pull-Up: (1 MΩ)

5

MOSI

I

SPI: MOSI

6

MISO

O

SPI: MISO

7

CLK

I

SPI: CLK

internal Pull-Up: (1 MΩ)

8

RxD

I

RS232: Receive Data

internal Pull-Up: (1 MΩ)

9

TxD

O

RS232: Transmit Data

10

DE

O

RS485: Transmit Enable

11

SDA

I/O

I²C: Serial Data

internal Pull-Up: (10 kΩ); Pull-Up resistors can be changed for proper I²C connection

12

SCL

I

I²C: Serial Clock

internal Pull-Up: (10 kΩ´

13

SBUF

TESTMODE

I

Low: Data available in send buffer

PowerOn Low: Test mode

internal Pull-Up: (10 kΩ)

14

DPROT

I

High: Small-/Shortprotokoll active

Low:  deactivated

internal Pull-Up: (10 kΩ)

15

A/D 0

I

Analog Input 0

internal Pull-Down: (1 MΩ)

16

A/D 1

I

Analog Input 1

17

A/D 2

I

Analog Input 2

18

A/D 3

I

Analog Input 3

19

I/O 0.0

I/O

I/O 0.0 (Bit 0)

internal Pull-Up: (1 MΩ), Reset-state: Tri-State, default: input

20

I/O 0.1

I/O

I/O 0.1 (Bit 1)

21

I/O 0.2

I/O

I/O 0.2 (Bit 2)

22

I/O 0.3

I/O

I/O 0.3 (Bit 3)

23

I/O 0.4

I/O

I/O 0.4 (Bit 4)

24

I/O 0.5

I/O

I/O 0.5 (Bit 5)

25

I/O 0.6

I/O

I/O 0.6 (Bit 6)

26

I/O 0.7

I/O

I/O 0.7 (Bit 7)

27

PWM

O

PWM-Output

28

DNC

---

Do not connect

Reserved for future use

29

DNC

---

Do not connect

30

DNC

---

Do not connect

31

DNC

---

Do not connect

32

DNC

---

Do not connect

33

DNC/+5-28V=

Do not connect / Power Supply

uniTFTs020-ATC: Reserved / uniTFTs015, 028, 035 and 043-ATC Rev.C and later: Power supply input +5..28V=

34

BUZZER

O

Sound

PWM output for external speaker

35

IO SDA

I/O

I²C data to portexpander / RTC

Portexpander MCP23017-E can be connected here. For EA uniTFTs020-ATC and EA uniTFTs028-ATC RTC MCP7940N - SN can be connected, too

36

IO CLK

O

I²C clock to portexpander / RTC

If not used please leave open

37

IO INT

I

Interrupt portexpander

If not used please leave open

38

IO RTC

I

Interrupt RTC

For EA uniTFTs020 and EA uniTFTs028 only. If not used please leave open. EA uniTFTs035 and EA uniTFTs043: internaly connected

39

VDD

Power Supply 3.3 V

40

GND

Ground 0 V