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ACT2861EVK1-201 Rev B User’s Guide
Description
This document describes the characteristic and operation of the Active Semi ACT2861EVK1-201 evaluation 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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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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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 dongle to ensure the black
wire is connected to the Dongle GND pin.
Figure 3 – USB-TO-I2C Dongle Connection
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Recommended Operating Conditions
The ACT2861EVK1-201 is designed for a 4V-29V input voltage. The maximum operating voltage is determined
by the IC’s maximum input voltage rating. The minimum operating voltage is 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.
Table 1. Recommended Operating Conditions
Parameter Description Min Typ Max Unit
VIN Charger input voltage 4 - 29 V
VBAT Charger output voltage 0 - 8.4 V
I
VIN_max
Maximum input current 3 A
I
VBAT_max
Maximum charge current 3 A
I
VREG_max
Maximum LDO VREG load current 0.1 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.
Charger Mode 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. Connect nOTG to 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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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
C
register. Refer to the ACT2861 datasheet for programming details.
Input Current Limit – The ACT2861EVK1-201 EVK input current limit is set to 3.03A. This is a function of the
10mΩ current sense resister, R6, the 20kΩ 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 20kΩ 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.
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In addition, short current, pre-charge current, termination detection current can also be modified by the ACT2816
GUI.
OTG Input Current Limit Configuration -
The ACT2861EVK1-201 EVK OTG current limit is set to 6.06A.
This is a function of the 10mΩ current sense resister, R21, the 20kΩ ROLIM resistor, R14, and the I
2
C OTG
Battery Ilim bits, OTG_BAT_ILIM, which are set to 200% by default. The OTG 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 OTG Battery Ilim field in the GUI.
OTG Output Current Limit Configuration -
The ACT2861EVK1-201 EVK OTG output current limit is set
to 3.03A. This is a function of the 10mΩ current sense resister, R6, the 20kΩ RILIM resistor, R15, and the I
2
C
OTG Current Limit bits, OTC_CC, which are set to 100% by default. The OTG output current limit is easily
changed by modifying any of these three parameters. The easiest way to change the input current limit is with
the OTG Current Limit field in the GUI.
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Additional Programmable Functionality
The ACT2861 contains many additional programmable parameters. Refer to the ACT2861 datasheet for
additional functionality and default I
2
C register values.
Test Results
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Schematic
10mR6
20k
R15
35V
47n
C9
35V
47n
C10
30R
R10
30R
R11
30R
R18
30R
R19
10V470n
C7
35V
470n
C11
10k
R20
10k
R16
1
2
J3 10k
R5
V_IO
nOTG
TH
NP
R1
NP
R2
VIN
EN_CHG nIRQ
SCL
SDA
20k
R13
22n
C5
2.2n
C3
V_IO
NP
R8
NP
R3
NP
R4
10k
R7
DNI
R9
DNI
R12
V_IO
GND
GND
AGND
GND
TP1
TP2
10V
0.1u
C12
10V
1u
C14
10m
R21
2
1
J8
3.5mm
TP9
TP10
GND
GND GND
20k
R14
GND
BLUE
D1
VREG
ISRP
ISRN
INPUT
nOTG
EN_CHG
SCL
SDA
A2D/IFB
GPIO/ICOMP
SHIPM
OLIM
ILIM
HSB1
SW1
SW2
HSB2
OSRN
OSRP
VBAT_OUT
VBAT
nIRQ
nCHG
VREG
INTBP
VIN
A2D/IFB
1
2
3
J5
J4
35V
10u
C8
35V
10u
C1
Active-Semi
SHIPM
GND
VBAT
VIN
470u
C2
0R
R17
1
2
3
J7
INTBP
V_IO
VREG
470u
C17
TP4
TP5
GND
35V
10u
C6
25V
22u
C15
25V
22u
C16
22u
C18
0R
R22
GND GND
AGNDAGND
AGND
J6
AGND
22u
C19
GND
ACT2861 EVK Schematic (PCB-0301-01-00)
ACT2861
AGND
1
TH
2
INTBP 3
VREG 4
PGND
5
SDA
6SCL
7
nOTG
8
SHIPM
9
nIRQ 10
OILIM
11
VBATS 12
OSRN 13
OSRP 14
HSB2 15
VBAT 16
VBAT 17
SW2 18
SW2 19
PGND
20
SW1 21
SW1 22
VIN
23
VIN
24
HSB1 25
ISRP
26
ISRN
27
nCHG 28
ILIM
29
A2D/IFB
30
GPIO/ICOMP
31
EN-CHG
32
U1
HP21
GND
GND
GNDGND GND
0.1u
C4
0.1u
C13
GND
TP3
BLK
TP6
BLK
TP7
BLK
SW1
1
2
J1
3.5mm
10u
L1
GND
TP8
BLK
DNI
C20 DNI
C21
AGND AGND
1
2
3
J2
V_IO
GND
TP11
BLK
GND
TP13
TP14
TP12
BLK
AGNDGND
DNI
R23 DNI
R24
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Layout
Figure 5 – Layout Top Layer
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Figure 6 – Layout Layer GND
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Figure 7 – Layout Layer VCC
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Figure 8 – Layout Bottom Layer
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Bill of Materials
Table 2. ACT2861EVK1-201 BOM
Item Ref Des QTY Description Package MFR Part Number
1
C1, C6, C8,
C15, C16, C18,
C19
7 Cap, Ceramic, 22uF,
35V, 10%, X7R 1206 TDK C3216X5R1V226M160AC
2 C2 2 ELCap, 470uF, 25V 8mmx11mm Wurth El-
ektronik 860010675020
3 C3 1 Cap, Ceramic, 2.2nF,
35V, 10%, X7R 0603 std std
4 C4, C13, C12 3 Cap, Ceramic, 0.1uF,
35V, 10%, X7R 0603 Wurth El-
ektronik 885012206020
5 C5, 2 Cap, Ceramic, 22nF,
35V, 10%, X7R 0603 std std
6 C7, C11 2 Cap, Ceramic, 470nF,
10V, 10%, X7R 0603 Wurth El-
ektronik 885012206014
7 C9, C10 2 Cap, Ceramic, 47nF,
35V, 10%, X7R 0603 Wurth El-
ektronik 885012206093
8 C14 1 Cap, Ceramic, 1uF, 10V,
10%, X7R 0603 Wurth El-
ektronik 885012206026
9 C17 1 ELCap, 470uF, 16V 8mmx11mm Wurth El-
ektronik 860020374012
10 C20, C21 2 DNI 0603 std std
11 D1 1 LED, Blue 0603 Wurth El-
ektronik 150060VS75000
12 J1, J8 2 Connector, 2 pin Wurth El-
ektronik 691214110002S
13 J2 1 Header, 2 pin, 100mil Wurth El-
ektronik 61300211121
14 J4, J6 2 Header, 1pin, 100mil Wurth El-
ektronik 61300111121
15 J3, J5, J7 3 Header, 3 pin, 100mil Wurth El-
ektronik 61300311121
16 L1 1 Wurth inductor 10uH 6mmx6mmx6
mm
Wurth El-
ektronik 74439346100
17 R1, R2 ,R3, R4,
R8, R23, R24, 7 DNI 0603 std std
18 R5, R7, R9,
R12, R16, R20 6 Res, 10kΩ, 1% 0603 std std
19 R6, R21 2 Res, 10mΩ, 1% 1206
SART
std
20 R10, R11, R18,
R19 4 Res, 30Ω, 1% 0603 std std
21 R13 1 Res,20kΩ, 1% 0603 std std
22 R14, R15 2 Res, 33kΩ, 1% 0603 std std
23 R17, R22 2 Res, 0Ω, 1% 0603 std std
24 SW1 1 SMT Tact switch
4mmx4mmx1.5mm
4mmx4mmx1.
5mm
Wurth El-
ektronik 430481035816
25
TP1, TP4, TP5,
TP9, TP13,
TP14
4 Test Point, Red, Through
Hole, 1mm 0.040" Keystone 5000
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26
TP2, TP3, TP6,
TP7, TP8,
TP10, TP11,
TP12
6 Test Point, Black,
Through Hole, 1mm 0.040" Keystone 5000
27 U1 1 ACT2861QI201 4mm×4mm
QFN
Active
Semi ACT2861QI201
28 -- 1 PCB, ACT2861EVK1
REVB n/a n/a PCB-0309-02
29 -- 3 Shunt, 100mil, Black n/a n/a 60900213421
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GUI Installation
1. Get GUI files from the Active Semi website
2. Plug the USB-TO-I2C dongle into a free USB port.
3. Follow the instructions in the “How to install driver for dongle” folder.
4. Double click on the ACT2861 GUI.exe to start the ACT2861 GUI.
GUI Overview
The GUI has 2 basic function buttons allocated in top-left of the Tool Bar which are Read and Write I
2
C. The
GUI contains 2 setting modes: Basic Mode and Advanced Mode. In Basic Mode screen it displays basic user
programmable configuration options are programmed using the drop-down boxes or check boxes. Advanced
Mode contain the button text for changing setting for every single bit.
Basic Mode
The following figure show the GUI in basic mode. This mode allows the user to easily change one or more IC
settings.
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Advanced Mode
Click the “Advanced Mode” button in the left of the GUI screen to see all available user programmable options.
With Advanced Mode, additional user programmable features can be selected using the button text. In the left
side of the Advanced Mode Screen, click on the Tiles Selector to display the register to view or change. Then
change a register one bit at a time by clicking on the desired bit. The value of the bit is display right next to the
bit-name button.
Note that the far right side of the screen contains a scroll down button to scroll down to additional registers since
the Tile Screen can only display up to 8 bytes at once.
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Button Descriptions
Read: Clicking on this button reads the ACT2861 registers and displays them in the GUI. Note that this reads
all registers. Active-Semi recommends reading registers each time the ACT2861 powers-up to acquire the initial
register settings. Active-semi also recommends reading registers after making changes to them. Immediately
reading the registers after a write confirms the changes were properly stored.
Read Button
Write: Clicking on this button writes the GUI settings to the ACT2861’s registers. All registers are written,
regardless of whether or not they were changed.
Write Button
Dongle Connection Status: The GUI also contains a dongle connection status that indicates Active-Semi’s
USB-TO-I2C dongle is connected to the USB port. The figure below shows the two possible indication status
graphics.
Dongle connected
Dongle Disconnected
