UG110
Rev 3.0, 11-Nov-2018
ACT2861EVK1-201Rev B User’s Guide
Description
This document describes the characteristic and operation of the Active Semi ACT2861EVK1-201evaluation kit
(EVK). It provides setup and operation instructions, schematic, layout, BOM, and test data. This EVK
demonstrates the ACT2861QI201 CMI version of the IC. Other ACT2861QIxxx options can be evaluated on
this EVK by replacing the IC and any other necessary components.
Features
The EVK can be used as a standalone board if desired. However, to access the internal registers and to take
full advantage of the IC’s capability, the user must connect the EVK kit to a PC with Active Semi’s USB-TO-I
2
C
interface dongle and use the GUI software. The EVK provides full access to each converter’s input and output
voltage, as well as all the digital control signals. This gives the user the flexibility to configure the EVK to
match their real world system.
Figure 1 – EVK Picture
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TM
ActiveSwitcher
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is a trademark of Active-Semi.
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UG110
Rev 3.0, 11-Nov-2018
EVK Contents
The ACT2861EVK1-201 evaluation kit comes with the following items:
1. EVK assembly
2. USB-TO-I2C dongle
a. Dongle
b. Custom 4-pin connector that connects the USB-TO-I2C dongle to the EVK assembly
Required Equipment
ACT2861EVK1-201
USB-TO-I2C Dongle
Power supply
4~30V
@ 6A for full power operation
Oscilloscope
100MHz,
4 channels
2-Serial Li-battery (or power supply capable of acting like a battery)
Digital Multi-meters (DMM)
Windows compatible PC with spare USB port.
Hardware Setup
Figure 2 – EVK Setup
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TM
ActiveSwitcher
TM
is a trademark of Active-Semi.
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Rev 3.0, 11-Nov-2018
Quick Start
Hardware Connections for Charge Mode
Refer to Figure 2 for hardware connections to quickly configure the EVK for Charging Mode.
1. Connect a DC power supply to J1. Please ensure the correct power supply polarity.
2. Connect a 2S Li-Battery to J8. Please make sure the correct battery polarity.
3. Connect Digital Multi-Meters to VIN and VBAT to monitor the input voltage and battery voltages.
4. Add a digital Multi-Meter in series with VIN and VBAT if want to observe input and output current.
5. Be careful to keep the input voltage and battery voltage within the specifications.
6. Optional – Connect the EVK to the PC with the USB dongle.
7. Add a jumper to J2 to connect EN_CHG to V_IO.
8. Add a jumper to J7 to connect INTBP to V_IO.
9. Apply 12V input power.
GUI Setup (optional)
1. Refer to the end of this document for detailed instructions to install the ACT2861 GUI.
2. Connect the USB-TO-I2C dongle to the computer.
3. Connect the USB-TO-I2C dongle to the EVK J5 connector. Refer to Figure 3 to ensure the correct
cable connector polarity. As a guide, use the “Active-Semi” logo on the top of the dongleto ensure the
black wire is connected to the Dongle GND pin.
Figure 3 – USB-TO-I2C Dongle Connection
Innovative Power
TM
ActiveSwitcher
TM
is a trademark of Active-Semi.
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UG110
Rev 3.0, 11-Nov-2018
Recommended Operating Conditions
The ACT2861EVK1-201is designed for a 4V-29V input voltage. The maximum operating voltage is determined
by the IC’s maximum input voltage rating. The minimum operating voltageis determined by the buck-boost
converter’s minimum input voltage. Maximum input and charging currents are determined by resistors and
IC’s CMI settings, which can be changed via I
2
C after startup.
Table1. Recommended Operating Conditions
Parameter
VIN
VBAT
I
VIN_max
I
VBAT_max
I
VREG_max
Description
Charger input voltage
Charger output voltage
Maximum input current
Maximum charge current
Maximum LDO VREG load current
Min
4
0
Typ
-
-
3
3
0.1
Max
29
8.4
Unit
V
V
A
A
A
EVK Operation
The ACT2861EVK1-201 operates in two different modes: Charger Mode and OTG Mode. The EVK hardware
setup is different for each of these two modes.
ChargerMode Configuration:
1. Connect INTBP and V_IO together with a jumper on J7.
2. Connect EN_CHG and V_IO together with a jumper on J2.
3. Leave the nOTG pin on J3 open.
4. In Charge mode, both an input supply and a battery are required. The EVK can be operated in Charge
mode without a battery, but needs the battery to perform actual charging.
Figure 4 – Jumper Settings for Charge Mode
OTG Mode Configuration:
1. Connect INTBP and V_IO together with a jumper on J7.
2. ConnectnOTGto GND with a jumper on J3.
3. Connect EN_CHG to GND with a jumper on J2.
4. Connect a load to VIN (J1). This is the OTG output.
5. In OTG mode, either a battery or a power supply must be connected to VBAT (J8). Do not connect a
power supply to VIN (J1).
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ActiveSwitcher
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UG110
Rev 3.0, 11-Nov-2018
Figure 5 – Jumper Settings for OTG Mode
Turn On the Evaluation Board
Before applying the input voltage, please make sure the jumper (J7) is installed. Connect V_IO to INTBP or
VREG. INTBP is the typical connection.
After power source and battery are connected to the evaluation board per the required connections for either
Charge mode or OTG mode, the EVK can be powered for operation.Perform the following steps to turn on the
board.
1.In Charge mode, ensure that the power supply connected to VIN (J1) is >4V and <29V.
2.In OTG mode, ensure that the power supply or battery connected to VBAT is >5V and <22.5V.
3. Turn on power supply.
4. Apply the load.
5. If the EVK is configured for OTG mode, the IC automatically goes into SHIP mode when power is applied to
VBAT. Push the SW1 button to exit SHIP MODE. When the IC exits SHIP MODE, it goes to HIZ MODE and
then OTG mode. Note that I
2
C communication will not work when the IC is in SHIP MODE.
Charge Current and Current Limit Configuration
The ACT2861 features configurable input current limit, charge current, OTG input current, and OTG output
current. These four features are programmed with a combination of an external resistor and an internal
I
2
Cregister. Refer to the ACT2861 datasheet for programming details.
Input Current Limit
– The ACT2861EVK1-201 EVKinput current limit is set to 3.03A. This is a function of the
10mΩ current sense resister, R6, the 33kΩ RILIM resistor, R15, and the I
2
C Input Current Limit bits, INLIMIT,
which are set to 67% by default. The input current limit is easily changed by modifying any of these three
parameters. The easiest way to change the input current limit is with the Input Current Limit field in the GUI.
Charge Current Configuration -
The ACT2861EVK1-201 EVK charge current is set to 1.505A. This is a
function of the 10mΩ current sense resister, R21, the 33kΩ ROLIM resistor, R14, and the I
2
C Fast Charge bits,
IFCHG, which are set to 50% by default. The charge current is easily changed by modifying any of these three
parameters. The easiest way to change the charge current limit is with the Fast Charge field in the GUI.
Innovative Power
TM
ActiveSwitcher
TM
is a trademark of Active-Semi.
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