UT-L 7-SEG R click
PID: MIKROE-2743
Add a double 7 segment display to your next project.
UT‐L 7‐SEG R click carries two SMD ultra thin (3.1mm) 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 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.
Specifications
Type
Applications
Displays
LED Segment
Displaying digits and letters on two 7 segment displays
DSM Series Ultra Thin Surface Mount Single Digit 7‐Segment LED Display
On‐board modules MAX6969 6‐Port, 5.5V Constant‐Current LED Driver
Key Features
Interface
Input Voltage
Click board size
Excellent character appearance, low power consumption
GPIO,SPI
3.3V or 5V
L (57.15 x 25.4 mm)
Pinout diagram
This table shows how the pinout on
UT-L 7-SEG R click
corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
Pin
1
2
3
AN
RST
CS
SCK
MISO
MOSI
3.3V
GND
PWM
INT
TX
RX
SCL
SDA
5V
GND
16
15
14
13
12
11
10
9
OE
NC
NC
NC
NC
NC
+5V
GND
Notes
PWM control of light intensity
NC
NC
Load‐Enable input
LE
Clock input
SCK
4
Serial Data Output
SDO
5
Serial Data Input
SDI
Power supply
Ground
6
+3.3V
7
GND
8
Power supply
Ground
Jumpers and settings
Designator Name
Default
Position
Default
Option
3V3
Description
Power Supply Voltage Selection 3V3/5V, down
position 3V3, up position 5V
JP1
PRW.SEL. Down
Programming
Code examples for UT-L 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-L 7-SEG R
click.
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
sbit
sbit
MAX6969_LE_PIN
at RC2_bit;
MAX6969_LE_PIN_Direction
at
TRISC2_bit;
uint16_t
pwmPeriod;
static const uint8_t
minus_char
=
0x40;
void
systemInit()
{
AD1PCFG
=
0xFFFF;
MAX6969_LE_PIN_Direction
=
0;
SPI3_Init();
pwmPeriod
=
PWM_Init(5000,
1, 1, 2);
PWM_Start(1);
PWM_Set_Duty(pwmPeriod/10,
1);
}
void
MAX6969_Chip_Select()
{
MAX6969_LE_PIN
=
1;
asm
nop
asm
nop
asm
nop
24
MAX6969_LE_PIN
=
0;
25
}
26
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;
33
34
SPI_Wr_Ptr(numbers[ones]);
35
SPI_Wr_Ptr(numbers[tens]);
36
}
37
38
void
main()
39
{
40
uint8_t
counter;
41
42
systemInit();
43
counter
=
100;
44
45
while(counter--)
46
{
47
U7SEG_Write(counter);
48
MAX6969_Chip_Select();
49
Delay_ms(500);
50
}
51
52
SPI_Wr_Ptr(minus_char);
53
SPI_Wr_Ptr(minus_char);
54
MAX6969_Chip_Select();
55
}
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