Rohm STEPMO_EVK_20x, Manual

Page: 14 / 21

14/20
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
STEPMO_EVK_20x Evaluation Board Manual
EUDC59-U-002 - Rev. 1.3
●
Connection to Microcontroller Motherboard
Since the EVK is designed as Arduino Shield it can be directly plugged into an Arduino microcontroller motherboard such as the
Arduino Uno. If the EVK is used with another microcontroller, all control signals and power supplies can be accessed / supplied via
the pin header row interfaces as documented in the tables below.
-Pin- Alias Function in EVK
All Model Versions except C, E
Models C, E
1 Shield 2 Shields 1 Shield 2 Shields
0 RX Reserved for Serial Communication via FTDI/USB
1 TX Reserved for Serial Communication via FTDI/USB
2 IRQ0 Free to use SH2_ENABLE Free to use SH2_I12
3 IRQ1 SH1_ENABLE SH1_I12
4 - Free to use SH2_MODE1 Free to use SH2_I02
5 - Free to use SH2_MODE0 Free to use SH2_PHASE2
6 - SH1_MODE0 SH1_PHASE2
7 - SH1_MODE1 SH1_I02
8 - Free to use Reserved Free to use SH2_I11
9 - Free to use SH2_CLK Free to use SH2_PHASE1
10 SS SH1_CLK SH1_PHASE1
11 MOSI Reserved SH1_I11
12 MISO Free to use SH2_CW_CCW Free to use SH2_I01
13 SCK SH1_CW_CCW SH1_I01
14 A0 SH1_PS
15 A1 Free to use SH2_PS Free to use SH2_PS
16 A2 Free to use
17 A3 Free to use
18 A4 Free to use
19 A5 Free to use
Table 8: Arduino IO Mapping to EVK Function
-Pin- Value Function in EVK
Vin 7V
This pin provides a supply voltage generated by EVK from the applied motor
voltage at screw terminal J6. This voltage is used as input voltage for the
Arduino motherboard or any other microcontroller board which may be used.
The maximum current drawn from this pin must not exceed 500mA (tbc).
5V 5V
This voltage is supplied by the Arduino motherboard to the EVK. In case of
using another microcontroller board, please supply a regulated 5V voltage to
this pin with a minimum current delivery capability of 10mA.
Gnd 0V
All pins
labelled “Gnd” are connected to the ground (0V) of the EVK and are
connected to the ground of the Arduino motherboard. In case of using another
microcontroller board, please connect these pins to its ground terminal.
Table 9: EVK power supply interface to microcontroller
In operation, the Arduino motherboard is supplied by the motor voltage connected to the EVK so no additional power supply to the
microcontroller board is necessary. However, in a typical lab set up the Arduino motherboard may be connected to the USB port of a
host while evaluating, testing and programming. The following table gives an overview about the allowed power supply connections
in this case if one or two EVKs are plugged into the microcontroller board.
EVK motor voltage Additional Arduino supply via
USB Vin DC Jack
Turned off / not
connected
Not recommended
Not allowed Not allowed
Turned on Allowed
Table 10: Matrix of allowed additional Arduino supplies while EVK(s) plugged in