STMicroelectronics L62 Series User manual
Introduction
The L62xx family evaluation environment is a fast, robust, and easy-to-use solution that allows to evaluate all the brush DC
and stepper motor drivers of the L62xx family in combination with a NUCLEO-F401RE control board and the STSPIN Studio
software.
The kit includes:
• a compact main board (EVL62XX-MAIN) compatible with the Arduino UNO R3 connector
• one plug-in board (EVL62XX-PLUG) based on the DMOS dual full-bridge driver for motor control of the STMicroelectronics
L62xx family. In particular:
L6205, L6225, L6206, L6226, L6207 and L6227 to drive from one to four DC motors
L6208 and L6228 DMOS to drive one bipolar stepper motor.
The maximum ratings of the plug-in boards are:
• power stage supply voltage (VS) from 8 V to 50 V
• motor phase current up to 1.4 A r.m.s. (L6225, L6226, L6227 and L6228)
• motor phase current up to 2.8 A r.m.s. (L6205, L6206, L6207 and L6208)
Figure 1. L62XX evaluation environment mounting L6205 driver board
Dual brush DC motor and stepper motor evaluation kit
UM2871
User manual
UM2871 - Rev 1 - July 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
1Getting started
The EVL62XX evaluation environment covers a wide range of applications and it is ready to be used in a few
steps.
Follow this procedure to start your evaluation:
1. Check the setting of the jumpers based on your configuration as described in Section 2: "Hardware
description and configuration".
2. Connect the plug-in board onto the main board.
3. Connect the main board with the STM32 Nucleo board through Arduino UNO R3.
4. Supply the board through the input 1 (VS) and 2 (ground) of the connector CN3.
Further support material is available on the respective product pages on www.st.com.
UM2871
Getting started
UM2871 - Rev 1 page 2/26
2Hardware description and configuration
Figure 2. EVL62XX-MAIN main board overview
CN1
Motor phases connector
CN2, CN3
Power connectors
50 V max
CN6
Arduino Uno R3 connector
CN5
Arduino Uno R3 connector
CN9
Arduino Uno R3 connector
CN6
Arduino Uno R3 connector
Plug-in board with selected device
R10
TOFF trimmer (Bridge B)
R8
OCD threshold trimmer (Bridge B)
R7
OCD threshold trimmer (Bridge A)
R9
TOFF trimmer (Bridge A)
The following tables provide the detailed pinout of the Arduino UNO R3 and ST Morpho connectors.
Table 1. Arduino UNO R3 connector table (L62x5, L62x6 and L62x7 devices)
Connector Pin(1) Signal Remarks
CN5
3 Fault B
4 Enable B
5 ADC-6
7 Ground
CN9
3 Enable A
4 Fault A
5 IN2B
6 IN1B
7 VREFA L6207/L6227 only
CN8
1 IN1A
2 IN2A
3 ADC-4
4 VREFB L6207/L6227 only
CN6
2 VDD
6 Ground
7 Ground
1. All non-listed pins are not connected.
UM2871
Hardware description and configuration
UM2871 - Rev 1 page 3/26
Table 2. Arduino UNO R3 connector table (L62x8 devices)
Connector Pin(1) Signal Remarks
CN5
1 Reset
3 Fault
4 Enable
5 ADC-6
7 Ground
CN9
5 HALF/FULL
6 CONTROL
7 VREFA
CN8
1 CLOCK
2 CW/CCW
3 ADC-4
4 VREFB
CN6
2 VDD
6 Ground
7 Ground
1. All non-listed pins are not connected.
2.1 Overcurrent (OCD) threshold setting (L6206 and L6226)
The plug-in boards based on L6206 and L6226 devices integrate two overcurrent protection circuits with
adjustable threshold, one for each full-bridge.
The overcurrent threshold is set by means of R7 (bridge A) and R8 (bridge B) resistors of the main board,
according to Figure 3.
Below the value of RCL = 5 kΩ the overcurrent threshold converges non-linearly to the maximum value of the
selected device, 5.6 A±30% for L6206 and 2.8 A±30% for L6226.
Figure 3. L6206: Overcurrent threshold vs. resistor value (no paralleling)
0
1
2
3
4
5
6
5 6 7 8 9 10
ISOVER
[A]
RCL [Ω]
UM2871
Overcurrent (OCD) threshold setting (L6206 and L6226)
UM2871 - Rev 1 page 4/26
Figure 4. L6226: Overcurrent threshold vs. resistor value (no paralleling)
0
0.5
1
1.5
2
2.5
3
5 6 7 8 9 10
ISOVER
[A]
RCL [Ω]
When one of the paralleling modes is used, the actual OCD threshold value is scaled as indicated in Table 3.
Further details are available in the application note AN1762, “L6205, L6206, L6207 DUAL FULL-BRIDGE
DRIVERS”, on the st.com website.
2.2 TOFF setting (L6207, L6208, L227 and L6228)
The plug-in boards based on L6207, L6227, L6208 and L6228 devices integrate a variable TOFF time, one for
each full-bridge, that can be set by means of ROFF, R9 (bridge A) and R10 (bridge B) resistors of the main board,
according to Figure 5.
Further details are available in the application note AN1762, “L6205, L6206, L6207 DUAL FULL-BRIDGE
DRIVERS”, on the st.com website.
Figure 5. tOFF vs. ROFF
1
10
100
1000
1 10 100 1000
tOFF [µs]
ROFF [kΩ]
2.3 Driving mode selection (L6205, L6225, L6206 and L6226)
Plug-in boards mounting the L62x5 or L62x6 devices can drive from 1 to 4 DC motors at the same time.
UM2871
TOFF setting (L6207, L6208, L227 and L6228)
UM2871 - Rev 1 page 5/26
The driving mode selection is done by properly setting J5, J6, J7 and J8 solder jumpers on the top of the boards.
By default, all solder jumpers are open (two bidirectional DC motor driving configuration).
The table below briefly summarizes the possible configurations:
Table 3. Hardware configurations
Mode Max. output current Output
RDS(ON)
OCD threshold
scaling J5 J6 J7 J8
2-bidirectional - default
(Figure 6)
L6205, L6206
2.8 Arms
0.3Ω x1
L6225, L6226
1.4 Arms
4-unidirectional
(Figure 7)
L6205, L6206
2.8 Arms
0.3Ω x1 (1)
L6225, L6226
1.4 Arms
1-bidirectional
High current parallel
(Figure 8)
L6205, L6206
5.6 Arms
0.15Ω x2 X X
L6225, L6226
2.8 Arms
2-unidirectional
High current parallel
(Figure 9)
L6205, L6206
5.6 Arms
0.15Ω x2 X X
L6225, L6226
2.8 Arms
1-bidirectional
Low overcurrent parallel
(Figure 10)
L6205, L6206
2.8 Arms
0.15Ω x1 X X
L6225, L6226
1.4 Arms
2-bidirectional
Low overcurrent parallel
(Figure 11)
L6205, L6206
2.8 Arms
0.15Ω x1 X X
L6225, L6226
1.4 Arms
1-unidirection
All bridges parallel
(Figure 12)
L6205, L6206
11.2 Arms
0.075Ω x4 X X X X
L6225, L6226
5.6 Arms
1. The current limit is shared between the two motors connected on the same full-bridge (A or B).
UM2871
Driving mode selection (L6205, L6225, L6206 and L6226)
UM2871 - Rev 1 page 6/26
Figure 6. Two bidirectional DC motors
Figure 7. Four unidirectional DC motors
UM2871
Driving mode selection (L6205, L6225, L6206 and L6226)
UM2871 - Rev 1 page 7/26
Figure 8. One bidirectional DC motor – higher current
B-
B+
A+
A-
M
M
VVS
GND
+
Figure 9. Two unidirectional DC motors – higher current
B-
B+
A+
A-
M
VVS
GND
M
+
UM2871
Driving mode selection (L6205, L6225, L6206 and L6226)
UM2871 - Rev 1 page 8/26
Figure 10. One bidirectional DC motor – lower overcurrent
B-
B+
A+
A-
VVS
GND
M
+
Figure 11. Two unidirectional DC motors – lower overcurrent
B-
B+
A+
A-
M
VVS
GND
M
+
UM2871
Driving mode selection (L6205, L6225, L6206 and L6226)
UM2871 - Rev 1 page 9/26
Figure 12. One unidirectional DC motor – all bridges parallel
B-
B+
A+
A-
VVS
GND
M
+
UM2871
Driving mode selection (L6205, L6225, L6206 and L6226)
UM2871 - Rev 1 page 10/26
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