Renesas RTK-251-1PowerBank3 R9A02G011 User manual

APPLICATION NOTE
R19AN0054EJ0100 Rev.1.0 Page 1 of 14
Nov 9, 2018
R9A02G011
RTK-251-1PowerBank3 Instruction Manual
Introduction
The RTK-251-1PowerBank3 is a 3cell (series connected) Li-ion battery power bank reference board having one USB
Type-CTM port. The USB Type-Cport supports the Dual Role Power (DRP) Feature. When the power bank is in Sink
mode, the power bank requests 5, 9, 15, 20V which is supported by a USB Power Delivery (USB PD) provider such as
a USB PD AC adapter. When the power bank is in Source mode, as long as an installed battery has enough power
budget, it will supply 5, 9, 12, 15, 20V which is requested by a USB PD consumer product such as a Tablet, PC, or
smartphone.
The RTK-251-1PowerBank3 works as DRP device and automatically detects Power provider such as a USB PD AC
adapter and Power consumer such as a Tablet, PC, and smartphone that is connected to this board. Also, it changes own
power role depending on the remaining battery capacities. The battery remaining capacities are always displayed on
LEDs.
The RTK-251-1PowerBank3 board is USB-IF PD3.0 certified and the functions and capabilities are fixed in the setting
at that time.
Target Device
USB Power Delivery Controller (PDC): R9A02G011
Buck-Boost Battery Charger (BB-Charger): ISL95538B
R19AN0054EJ0100
Rev.
1.0
Nov 9, 2018

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Contents
1. Features..........................................................................................................................3
1.1 USB-IF PD3.0 certified configurations......................................................................................5
2. Functions........................................................................................................................6
2.1 Battery charging.......................................................................................................................... 6
2.2 LED function................................................................................................................................7
2.3 Protection functions ................................................................................................................... 8
3. Board Setup and how to use.........................................................................................9
3.1 Required materials to use this board........................................................................................ 9
3.2 Board settings...........................................................................................................................10
3.3 Battery power connection........................................................................................................11
3.3.1 Operation example of Source mode. ................................................................................11
3.3.2 Operation example of Sink mode...................................................................................... 12
4. Optional functions........................................................................................................13

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1. Features
The RTK-251-1PowerBank3 supports the following features.
USB Power Delivery and USB Type-C
Having one USB Type-C port
Power Role: Dual Role (Supports Try.SRC mode)
Power Source voltage (no PPS): 5, 9, 12, 15, 20V
Power Sink: 5, 9, 15, 20V
Battery Charger
Battery type: Li-ion battery.
Number of cells: 3series cells
Trickle Charging
5 LED indicators
USB Type-C port status indicator (1 LED)
Battery remaining capacity indicator (4 LEDs)
Protections
Over Temperature Protection (USB Type-C Receptacle)
Over Voltage Protection (VBUS voltage)
Over Current Protection (VBUS current)
Figure 1-1 RTK-251-1PowerBank3 Block Diagram

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Figure 1-2 RTK-251-1PowerBank3 Board picture (Top View)
Figure 1-3 RTK-251-1PowerBank3 Board picture (Bottom View)
U1: PDC
U3: ISL95538B
U38-U39: DC-DC for VDD, Vconn
JP2: Switch pad
RT1: Thermistor

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1.1 USB-IF PD3.0 certified configurations
The RTK-251-1PowerBank3 board is USB-IF PD3.0 certified under the following configurations.
Category: Power Brick (no PPS)
Product Name: RTK-251-1PowerBank3
TID: 1090007
Power Role: Dual Role (Supports Try.SRC)
45W Power Source: 5, 9, 12, 15, 20V
60W Power Sink: 5, 9, 15, 20V
Supports BC1.2 DCP

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2. Functions
The RTK-251-1PowerBank3 board functions are described in this section.
2.1 Battery charging
The RTK-251-1PowerBank3 manages Battery Charging. it starts to charge the battery with charging current and stops
charging when the battery charging current is less than 200mA for 200ms in CV loop. The RTK-251-1PowerBank3
restarts charging when the battery voltage is decreased below “Max Voltage”. The RTK-251-1PowerBank3 also
supports trickle charging to an overly discharged battery. It can activate the trickle charging function when the battery
voltage is lower than “Min Voltage”. “Max Voltage” and “Min Voltage” are pre-programmed in PDC firmware.
Figure 2-1 Battery Charging Image.

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2.2 LED function
Figure 2-2 LEDs on RTK-251-1PowerBank3.
USB Type-C port role
LED_Type-C behavior
Unplugged
OFF
Sink mode
Blinking (0.5 sec interval as default)
Sink mode (Fully-charged)
OFF
Source mode
Lighted
Source mode (Low Battery)
OFF
Table 2-1 USB Type-C Port role indicator (Blue LED: D16)

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Under charging RTK-251-1PowerBank3 from USB PD source device
Battery power
LED1
LED2
LED3
LED4
Low Battery - 0 %
OFF
OFF
OFF
OFF
0 % -30 %
OFF
OFF
OFF
OFF
30 % - 45 %
Lighted
OFF
OFF
OFF
45 % - 60 %
Lighted
Lighted
OFF
OFF
60 % -
Lighted
Lighted
Lighted
OFF
Fully-charged
Lighted
Lighted
Lighted
Lighted
Table 2-2 Battery remaining capacity indicator (Green LED: D15, D14, D13, D8)
Under discharging RTK-251-1PowerBank3 to other battery device or Unplugged
Battery power
LED1
LED2
LED3
LED4
Low Battery – 0 %
OFF
OFF
OFF
OFF
0 % - 30 %
Lighted
OFF
OFF
OFF
30 % - 45 %
Lighted
Lighted
OFF
OFF
45 % - 60 %
Lighted
Lighted
Lighted
OFF
60 % -
Lighted
Lighted
Lighted
Lighted
Fully-charged
Lighted
Lighted
Lighted
Lighted
Table 2-3 Battery remaining capacity indicator (Green LED: D15, D14, D13, D8)
2.3 Protection functions
The RTK-251-1PowerBank3 supports the protection functions.
Parameter
Description
Threshold value
OCP
When VBUS current is over 3.2A, ISL95538B will stop VBUS.
Then PDC detect VBUS drop as OCP.
Fixed
OVP
Over voltage protection value. Send Hard Reset command to
source when VBUS voltage is reaching the OVP value.
25V
OTP
Over temperature protection value.
For details, please refer to R9A02G011 User Manual.
Safe: 40 degrees C
Warning: 60 degrees C
Danger: 80 degrees C

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3. Board Setup and how to use
Prior to start using the board, please make sure if the jumpers settings are the same as the following instructions. Also,
please don’t try other settings, which all are reserved.
3.1 Required materials to use this board.
3 cells Li-ion battery pack having a battery protection function, the battery emulator or the two/four-quadrant
DC power supply: 1 unit
USB Type-C Cable: 1pcs
Caution:
Please use this board when you understand and agree that Renesas DOES NOT have any
responsibility, indemnification, or liability for use of this board. Especially, Li-ion batteries may
cause fire, injury, explosion, etc. if they are handled incorrectly. Please use the charge /
discharge of the battery at your own risk.
Item
Condition / Note
Specification
Nominal Voltage
Average
10.8V
Standard Charge
Constant current
Greater than 2000mA
Maximum Charge Voltage
12.6V
Standard Discharge
Cut off voltage
Lower than 8.25V
Constant current
Greater than 6000mA
Operating Temperature
Charge
0 ~ 45 degrees C at least.
Discharge
-20 ~ 60 degrees C at least.
Table 3-1 Requirements for 3 cells battery pack to be used.

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3.2 Board settings
The Jumper settings of RTK-251-1PowerBank3 board is described in this section. Other settings are reserved and please
DO NOT change them.
Caution:
Make sure the HW setting matches the battery pack configuration. Li-ion batteries may cause fire,
injury, explosion, etc. if this HW setting is different from an actual battery configuration.
Figure 3-1 JP32/JP33/JP34/JP38/JP39/JP40 jumpers on RTK-251-1PowerBank3.
JP32
JP33
JP34
JP38
JP39
JP40
3 cells
OFF
ON
OFF
OFF
ON
OFF
Table 3-2 JP32/33/34/38/39/40 settings.
JP2 (Switch Pad)
R114 mounted on 1-2 side
Table 3-3 JP2 setting.
Figure 3-2 JP44/JP45 jumpers on RTK-251-1PowerBank3.
JP44
JP45
Connected 1 and 2
Connected 1 and 2
Table 3-4 JP44/JP45 setting

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3.3 Battery power connection
Figure 3-3 shows the battery power connection to RTK-251-1PowerBank3 board.
- Battery V+ should be connected to J5 (Red Banana Jack)
- Battery V- should be connected to J6 (Black Banana Jack)
Figure 3-3 Battery power and USB device connection.
After installing the battery power, RTK-251-1PowerBank3 is ready to use.
3.3.1 Operation example of Source mode.
Figure 3-4 shows the connection example of charging device using RTK-251-1PowerBank3 board.
Figure 3-4 connection configuration of source mode.
When connecting a PD device to RTK-251-1PowerBank3 board via Type-C cable, RTK-251-1PowerBank3 detects it
and tries to be in Source mode so that power can be charged to an attached device as much as possible. If the RTK-251-
1PowerBank3 is in source mode, Lighting blue LED on RTK-251-1PowerBank3 and charging VBUS to an attached
device.
The RTK-251-1PowerBank3 does not operate as Source device when the power role of connected device is Source
only or RTK-251-1PowerBank3 is in the low battery status.
The RTK-251-1PowerBank3 operates only as Sink device when the Battery Level falls below the Low Battery
Detection Threshold. And Source operations resumes when the Battery Level exceeds the Low Battery Detection
Threshold.

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3.3.2 Operation example of Sink mode.
Figure 3-5 shows the connection example of charging RTK-251-1PowerBank3 using PD source device.
Figure 3-5 connection configuration of sink mode.
When the RTK-251-1PowerBank3 is connected to Source only device such as USB PD AC adapter via USB Type-C
cable, it automatically detects the device and always becomes Sink mode. If the RTK-251-1PowerBank3 is connected
to the Legacy USB downstream port using USB A to C cable, RTK-251-1PowerBank3 also becomes Sink mode
automatically by detecting VBUS power.
When DRP device is connected, the RTK-251-1PowerBank3 tries to become Source mode as much as possible. If
RTK-251-1PowerBank3 detects the low battery status, RTK-251-1PowerBank3 is fixed to Sink mode until battery is
charged enough. When RTK-251-1PowerBank3 is in Sink mode, LED (Blue) is blinking.

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4. Optional functions
The RTK-251-1PowerBank3 board is not possible to change parameters by using the Renesas ROM Image Generator.
The RTK-251-1PowerBank3 supports any other optional functions as following. They are disabled in this kit. For
changes in these functions, please contact Renesas local sales offices.
Customize USB Type-C output power (Up to 60W PDPNote, supported optional capabilities such as 12V or
14.8V, supported PPS)
Customize Battery power (Number of cells, Battery capabilities)
Customize LED behavior
Switch function
Deep Sleep mode
Note: Maximum PDP is depended on Battery power.

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Website and Support
Renesas Electronics Website
http://www.renesas.com/
Inquiries
http://www.renesas.com/contact/
All trademarks and registered trademarks are the property of their respective owners.

A-1
Revision History
Rev.
Date
Description
Page
Summary
1.0
Nov 9, 2018
—
Initial Release

General Precautions in the Handling of Microprocessing Unit and Microcontroller Unit Products
The following usage notes are applicable to all Microprocessing unit and Microcontroller unit products from Renesas.
For detailed usage notes on the products covered by this document, refer to the relevant sections of the document as
well as any technical updates that have been issued for the products.
1. Handling of Unused Pins
Handle unused pins in accordance with the directions given under Handling of Unused Pins in the
manual.
The input pins of CMOS products are generally in the high-impedance state. In operation with
an unused pin in the open-circuit state, extra electromagnetic noise is induced in the vicinity of
LSI, and an associated shoot-through current flows internally; malfunctions can occur due to
the false recognition of the pin state as an input signal. Unused pins should be handled as
described under Handling of Unused Pins in the manual.
2. Processing at Power-on
The state of the product is undefined at the moment when power is supplied.
The states of internal circuits in the LSI are indeterminate and the states of register settings and
pins are undefined at the moment when power is supplied.
In a finished product where the reset signal is applied to the external reset pin, the states of
pins are not guaranteed from the moment when power is supplied until the reset process is
completed.
In a similar way, the states of pins in a product that is reset by an on-chip power-on reset
function are not guaranteed from the moment when power is supplied until the power reaches
the level at which resetting has been specified.
3. Prohibition of Access to Reserved Addresses
Access to reserved addresses is prohibited.
The reserved addresses are provided for the possible future expansion of functions. Do not
access these addresses; the correct operation of LSI is not guaranteed if they are accessed.
4. Clock Signals
After applying a reset, only release the reset line after the operating clock signal has become
stable. When switching the clock signal during program execution, wait until the target clock signal
has stabilized.
When the clock signal is generated with an external resonator (or from an external oscillator)
during a reset, ensure that the reset line is only released after full stabilization of the clock
signal. Moreover, when switching to a clock signal produced with an external resonator (or by
an external oscillator) while program execution is in progress, wait until the target clock signal is
stable.
5. Differences between Products
Before changing from one product to another, i.e. to a product with a different part number, confirm
that the change will not lead to problems.
The characteristics of Microprocessing unit or Microcontroller unit products in the same group
but having a different part number may differ in terms of the internal memory capacity, layout
pattern, and other factors, which can affect the ranges of electrical characteristics, such as
characteristic values, operating margins, immunity to noise, and amount of radiated noise.
When changing to a product with a different part number, implement a system-evaluation test
for the given product.

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