S100 Slave - H Bridge
The S100 Slave - H Bridge is a certified Rhomb.io module suitable for small motor projects. This module uses two motor drivers which can control 2 DC motors with an operating Voltage from 2.5V up to 12V. As an extended function, the S100 Slave - H Bridge also includes a Watchdog to improve the versatility of the module.
The next figure shows a 3D view for the S100 Slave - H Bridge.
- Motor Control
The S100 Slave - H Bridge has been built around the motor control driver chip L9110. File:datasheet-l9110(5).pdf
The module includes two L9110 so it is posible to control two DC motors, one for each L9110.
This chip has two TTL / CMOS compatible with the level of the input, with good resistance; two output terminals can directly forward and reverse movement of the drive motor, it has a large current driving capability, each channel through 750 to 800 mA of continious current, peak current capability up to 1.5A to 2.0A; while it has a low output saturation voltage.
The module also includes a watchdog timer. The device selected is the 'STWD100YNYWY3F'. File:en.CD00176077.pdf
This device is used to prevent system failures.
The following figure identifies the main components onboard.
The next figure shows the Block Diagram for the S100 Slave - H Bridge:
|H BRIDGE Key Features|
|Low quiescent current|
|800 mA continious current output capability per channel|
|Op. Voltage: 2.5 V to 12V|
|Op. Temperature: 0 ºC to +80 ºC|
|Watchdog timer circuit|
The following table indicates the available serial interfaces of the Rhomb.io standard used in this module. This table relates the interfaces of the Rhomb.io standard with the net names of the schematic and with the components to which they are connected.
|Rhomb.io Interface||Schematic Signal||Component||Component Pin||Comment|
|I2C-A||I2C-A_SDA||Motor 1 L9110 (U3)||IB||SJ5 must be closed|
|I2C-A_SCL||IA||SJ6 must be closed|
|SPI-A||SPI-A_MISO||Motor 2 L9110 (U2)||IB||SJ7 must be closed|
|SPI-A_MOSI||IA||SJ8 must be closed|
|SPI-A_CLK||WatchDog (U4)||WDI||SJ10 must be closed|
|SPI-A_CS1||WDO||SJ11 must be closed|
- I2C-A: By default, this interface is disabled. SJ5 and SJ6 must be closed to use the I2C-A bus in the module.
- SPI-A: By default, this interface is disabled. SJ7, SJ8 and SJ10 must be closed to use SPI-A.
Please, pay attention to the previous table to avoid signal collisions.
GPIOs and Control Signals
The following table summarizes the GPIOs and Control Signals used on the S100 Slave - H Bridge. This table relates the signals of the Rhomb.io standard with the net names of the schematic and with the components to which they are connected.
|Rhomb.io Signal||Schematic Signal||Component||Component Pin||Comment|
|RST_OUT||RST_OUT||WatchDog (U4)||WDO||SJ13 must be closed|
|IO||IO0||Motor 1 L9110 (U3)||IB||Pay attention to SJ5|
|IO1||Motor 1 L9110 (U3)||IA||Pay attention to SJ6|
|IO2||Motor 2 L9110 (U2)||IB||Pay attention to SJ7|
|IO3||Motor 2 L9110 (U2)||IA||Pay attention to SJ8|
|IO4||WatchDog (U4)||EN!||R6 must be assembled|
|1Wire||1Wire||WDI||SJ9 must be closed|
|CAPT||CAPT1||WDO||SJ12 must be closed|
- Please, pay attention to the previous table to avoid signal collisions.
- By default, the Motor Driver 1(U3) is controlled by the S100 Rhomb.io GPIO-A. If you want to change the way to control it you can use the I2C-A by closing the Solder Jumpers mentioned before.
- By default, the Motor Driver 2(U2) is controlled by the S100 Rhomb.io GPIO-A. If you want to change the way to control it you can use the SPI-A by closing the Solder Jumpers mentioned before.
- The configuration of the Watchdog is not established by default.
The next table summarizes the posible configurations:
|Motor Driver 1||IB||GPIO-A_IO0||By default|
|Motor Driver 2||IB||GPIO-A_IO2||By default|
- The output signals of the L9110 motor drivers which are connected by the terminal blocks with the Motors are also connected to the S100 Rhomb.io Connectors.
The next table summarizes the posible configurations:
|Motor 1||OA_OUTPUT||J3||OA||Directly connected|
|J102||Pin 49||Directly connected|
|J102||Pin 2||Directly connected|
|Motor 2||OA_OUTPUT||J2||OA||Directly connected|
|J101||Pin 10||R7 must be assembled|
|J101||Pin 11||R8 must be assembled|
Please be careful with these connections. Some specific combinations of Modules may produce a collision between the Signals. Before connecting this Slave Module make sure the lines does not collide
The S100 Slave - H Bridge can use a wide range of Voltage supplies. Due to the Motor drivers' voltage range: 2.5V to 12V, there are a lot of power posibilities in this module.
It is posible to identify two main types of power supplies:
The external power supply is connected by the terminal block J1. It includes a voltage range from 2.5 V to 12V. It is important to mention that if the voltage needed is 2V8, 3V3 or 5V it is easier to use the internal Rhomb.io power rails.
The internal power supply is named as Vselect. These are the different posibilities:
-VIO_IN this is the Master Module Voltage
All of these power supplies come directly from the S100 Rhomb.io connectors. These power supplies come directly from the carrier board.
The next table summarizes the power supply:
|External||Vext||from 2.5V to 12V||Connected to J1(Terminal block)|
|Internal||Vselect||VSYS (5V)||SJ1 must be closed|
|3V3||SJ2 must be closed|
|2V8||SJ4 must be closed|
|VIO_IN (Master Module Voltage)||SJ3 must be closed|
Click the image below to download the schematic files.
Bill Of Materials
Click the image below to download the BOM files.
Click the image below to download the fabrication files.
Due to the components on the bottom side exceed the 0.8 mm height that the Rhomb.io standard defines between the Motherboard PCB and the Modules PCB for the correct connection between them, a stacked Adapter is required to use this module.
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- Equipment and work table must be earthed.
- Ionizer is recommended to remove electron charge.
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