UT-M 7-SEG R click

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  • MIKROE-2746
  • MIKROE-2746
UT-M 7-SEG R click  carries two SMD ultra thin LED 7-SEG  displays  and... more
Product information "UT-M 7-SEG R click"

UT-M 7-SEG R click carries two SMD ultra thin LED 7-SEG displays and the MAX6969 constant-current LED driver from Maxim Integrated. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over SPI interface.

Display features

How the click works

The 7 segment displays are interfaced to the MCU over the MAX6969 16-port, constant-current LED driver IC.

It uses the common 4-wire serial bus for communication with the MCU itself (LE, SCK, SDO, SDI on mikroBUS™ pin socket).

There is an additional OE (output enable) pin which is used to control the output driver state (enabled/disabled). Since it is the PWM output pin on the mikroBUS™ by default, the LED segments light intensity could be controlled by software too.

MAX6969 driver features

The MAX6969 uses the industry-standard, shift-register-plus-latch-type serial interface.

The driver accepts data shifted into a 16-bit shift register using data input DIN and clock input CLK. Input data appears at the DOUT output 16 clock cycles later to allow cascading of multiple MAX6969s. So, the IC allows you to connect multiple click boards™ - for applications that require more than two seven segment displays, such as digital clocks, temperature sensors, etc.


Type LED Segment
Applications Displaying digits and letters on two 7 segment displays
Displays Ultra thin (3.1mm) LED 7-SEG displays in RED emitting color
On-board modules MAX6969 6-Port, 5.5V Constant-Current LED Driver
Key Features Excellent character appearance, low power consumption
Interface SPI
Input Voltage 3.3V or 5V
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on UT-M 7-SEG R click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
  NC 1 AN PWM 16 OE PWM control of light intensity
  NC 2 RST INT 15 NC  
Load-Enable input LE 3 CS TX 14 NC  
Clock input SCK 4 SCK RX 13 NC  
Serial Data Output SDO 5 MISO SCL 12 NC  
Serial Data Input SDI 6 MOSI SDA 11 NC  
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground

Jumpers and settings

DesignatorNameDefault PositionDefault OptionDescription
JP1 PRW.SEL. Left 3V3 Power Supply Voltage Selection 3V3/5V, left position 3V3, right position 5V


Code examples for UT-M 7-SEG R click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet counts down from 99 to 0 on the displays of the UT-M 7-SEG R click.

01 sbit   MAX6969_LE_PIN   at  RC2_bit;
02 sbit   MAX6969_LE_PIN_Direction   at  TRISC2_bit;
04 uint16_t pwmPeriod;
05 static const uint8_t minus_char = 0x40;
07 void systemInit()
08 {
09     AD1PCFG = 0xFFFF;
10     MAX6969_LE_PIN_Direction = 0;
11     SPI3_Init();
12     pwmPeriod = PWM_Init(5000, 1, 1, 2);
13     PWM_Start(1);
14     PWM_Set_Duty(pwmPeriod/10, 1);
16 }
18 void MAX6969_Chip_Select()
19 {
20     MAX6969_LE_PIN = 1;
21     asm nop
22     asm nop
23     asm nop
24     MAX6969_LE_PIN = 0;
25 }
27 static void U7SEG_Write(uint8_t number)
28 {
29     char numbers[10] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F};
30     uint8_t tens = number / 10;
31     uint8_t ones = number % 10;
32     if (number > 99) return;
34    SPI_Wr_Ptr(numbers[ones]);
35     SPI_Wr_Ptr(numbers[tens]);
36 }
38 void main()
39 {
40     uint8_t counter;
42    systemInit();
43     counter = 100;
45    while(counter--)
46     {
47         U7SEG_Write(counter);
48         MAX6969_Chip_Select();
49         Delay_ms(500);
50     }
52    SPI_Wr_Ptr(minus_char);
53     SPI_Wr_Ptr(minus_char);
54     MAX6969_Chip_Select();
55 }


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