onsemi NCL31010GEVK User manual

EVAL BOARD USER’S MANUAL
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©Semiconductor Components Industries, LLC, 2022
January, 2022 − Rev. 0 1Publication Order Number:
EVBUM2824/D
NCL31010 Evaluation Kit
User's Manual
IEEE 802.3bt Complete PoE Connected
LED Driver Power Solution Kit
NCL31010GEVK
General
The NCL31010GEVK kit allows easy implementation
and evaluation of a Power−over−Ethernet powered LED
Luminaire Controller that is able to operate with an assigned
power level up to 51 W.
The NCL31010REFGEVB evaluation board is based on
the Complete PoE Connected LED Driver Power Solution
NCL31010 (U2) with integrated PoE PD interface
controller, dual synchronous step−down DC/DC converters
for the main 3.3 V VDD system supply as well as an
auxiliary supply VDD2 and a current mode buck DC/DC
controller designed to operate as a LED driver.
Figure 1. Operational NCL31010GEVK Showing
Basic Interconnections
The NCL31010REFGEVB board is designed as a PoE
splitter: having a PoE−enabled Ethernet port (labeled “PoE
IN”) as input while passing through the data to another
Ethernet port (labeled “ETH OUT”).
The NCL31010REFGEVB reference design board is
Ethernet Alliance PoE Certified and YellowDottready.
Quick Start Guide
Step 1: Mount the Arduino®Adapter Shield on the
unpowered microcontroller board with Arduino UNO
compatible headers.
Step 2: Configure the jumpers on the Arduino Adapter
Shield. Figure 2 shows the jumper settings for a
microcontroller board with Arduino UNO R3 compatible
headers using PWM for Analog Dimming.
Figure 2. Jumper Settings
Step 3: Mount the NCL31010REFGEVB on the Arduino
Adapter Shield (NCL31010AASGEVB).
Step 4: Connect the black Ethernet patch cable to the
Ethernet connector J1 (labeled “ETH OUT”) and to the
Ethernet connector on the microcontroller board.
Step 5: Connect the LED load to connector J4 (labeled
“LED”) while observing the correct polarity (cf. black and
red wires in the picture on the left). Ideally, the LED load has
a 0.65 A to 1.4 A current rating with a 16 V to 38 V forward
voltage range.
Step 6: Insert the Ethernet cable (cf. blue cable in the picture
on the left) coming from the PSE in the Ethernet connector
J2 (labeled “PoE IN”).
If the PSE powers up the system, the green 3V3 VDD LED
should be ON and the orange MPS LED should be blinking.
The status of the remaining LEDs depends on the jumper
settings.

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Detection
During the detection phase, NCL31010 will connect the
detection resistor (R56) to VPORTP and VPORTN.
The detection process can be easily corrupted by
equipment − connected to the NCL31010GEVK kit or the
microcontroller board − that has a not high enough
impedance to earth.
If the computer system connected to the microcontroller
board is not fully floating with respect to earth, it might be
necessary to connect the USB cable between the computer
and the microcontroller board after NCL31010REFGEVB
has been detected and powered up by the PSE.
Also, when using an Electronic Load instead of a real LED
module, it is generally required to connect it to LED
connector J4 after NCL31010REFGEVB has been detected
and powered up by the PSE.
Assigned Power
The NCL31010REFGEVB will request Class 6 during
Physical Layer classification. Class 6 PDs need to take into
account that they can be underpowered and eventually be
assigned to Class 3 or 4.
The state of the CLASSEVENT bits in the Classification
Result Register (&CRR 0x03) provides information about
the power level that the PSE has assigned to the
NCL31010REFGEVB during classification. See Table 1 to
determine the assigned power based on the status of the
CLASSEVENT bits.
Table 1. CLASSIFICATION RESULT
CLASSEVENT
Bit [1:0]
Assigned
Class
Assigned Power
00
3
13 W
01
4
25.5 W
10
651 W
11
The application should always operate at or below the
assigned power limit. Failure to do so will result in the PSE
disconnecting the NCL31010REFGEVB !
PSE Categorization
The state of the LCF bit 2 in the Classification Result
Register (&CRR 0x03) provides information (retrieved
during classification) about the type of PSE the
NCL31010REFGEVB is connected to. See Table 2 to
determine the PSE Generation based on the status of the LCF
bit 2.
Table 2. PSE GENERATION
LCF Bit 2
PSE Categorization
0
Gen 1 (802.3af/at) PSE
1
Gen 2 (802.3bt) PSE
The PSE Generation determines the MPS timing of the
Maintain Power timer. It also indicates to a PD requesting
Autoclass whether it makes sense to go to the maximum
power state according to its assigned Class.
System Startup
Once its port capacitance – mainly determined by the
56 mF aluminum capacitor C10 – can be considered fully
charged, the 3.3 V VDD Step−Down converter of
NCL31010 will start. When the 3.3 V VDD supply is
ramping up, the 4.6 V Step−Down converter on the Arduino
Adapter Shield powered from VPORTP will be
automatically enabled next if no jumper is mounted on
header P18.
The operation of the 3.3 V VDD Step−Down converter of
NCL31010 can be verified by the green LED (LED2) on
NCL31010REFGEVB. The operation of the 4.6 V
Step−Down converter can be verified by the red LED
(LED2) on the Arduino Adapter Shield
(NCL31010AASGEVB).
This 4.6 V supply is connected to the +5V with a series
diode, so it can power the microcontroller board when the
USB connection is not present. The operation of the +3.3V
LDO on the microcontroller board powered from +5V can
be verified by the green LED (LED1) on the Arduino
Adapter Shield.
The microcontroller can check if the NCL31010 is
powered by measuring the voltage on analog input pin A0,
which will be 2.4 V (i.e. the NCL31010 Reference Voltage
VREF) when NCL31010 is fully operational.
There is a 1k series resistor (R32) on the Arduino Adaptor
Shield to protect the NCL31010 VREF pin against an
overcurrent in case the microcontroller would use pin A0 as
a digital output. Eventually this series resistor can be shorted
by solder bridge SB2 on the top side of the Arduino Adapter
Shield.
Maintain Power Signature (MPS)
A PD should draw a minimum amount of current in order
to prevent the PSE from removing power. The load resistor
R63 – driven by the Maintain Power timer which is enabled
by default − was added on the bottom side of the board to
make sure the load current is always sufficient and the
NCL31010REFGEVB remains powered. The operation of
the Maintain Power timer can be observed by the blinking
of the orange MPS LED (LED4).
When the LED driver is enabled and delivers sufficient
power to the LED load (above 912 mW when assigned to
Class 6 or above 570 mW when underpowered), the
Maintain Power timer may be disabled in order not to waste
power unnecessarily. This is accomplished by writing a ‘0’
to the MPS_EN bit 7 in the Maintain Power Signature
Register (&MPS 0x50). In that case, don’t forget to
re−enable the Maintain Power timer when dimming the light
to a low power level or when turning off the LED driver.

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I2C
Communication with NCL31010 is performed via the
I2C−bus on digital I/O pins D19/SCL and D18/SDA at the
7−bit address 80 (0x50), due to the 0E resistors mounted on
JP13 and JP14 on NCL31010REFGEVB.
The Arduino Adapter Shield contains a Dual Supply I2C
Voltage Translator (U1): FXMA2102 or FXMAR2102.
When using an Arduino Uno R3 compatible
micro−controller board, the VCCA supply of FXMA(R)2102
– called VDDI2C – should be connected to the IOREF pin
by a jumper in the center position on header P14 on the
Arduino Adapter Shield. When using a microcontroller
board on which the VCCIO pin is not available, the user
should alter the position of the jumper on P14 and manually
select either the +3V3 pin or the +5V pin depending on the
operating voltage of the microcontroller.
The Arduino Adapter Shield provides a 4.3k pull−up
resistor on both SDA (R1) and SCL (R3). Eventually these
pull−up resistors can be disabled by mounting a jumper on
header P8. If FXMAR2102 (Device Code ‘BU’) is mounted
as I2C Voltage Translator (U1) on the Arduino Adapter
Shield, it provides an additional internal 10k pull−up resistor
on both SDA and SCL, whereas FXMA2102 (Device Code
‘XN’) does not.
Data on the I2C−bus can be transferred at rates of up to
100 kbit/s in the Standard−mode or up to 400 kbit/s in the
Fast−mode.
Standby
As mentioned before, only the 3.3 V VDD Step−Down
converter of NCL31010 will start automatically.
The 5 V VDD2 regulator is enabled when the VDD2_EN
bit 0 in the Control Register (&CTRL 0x04) is set. The
operation of the 5 V VDD2 Step−Down converter can be
verified by the red LED (LED1) on the NCL31010
REFerence design board. The 5 V VDD2 supply is available
on the POWER_OUT connector/header P7 (labeled
‘VDD2’) on the Arduino Adapter Shield.
The Metrology block is enabled when the DIAG_EN bit 2
in the Control Register (&CTRL 0x04) is set.
Power Delay
Initially – i.e. during the first 80 ms – a PoE powered
system should operate with a power level below 13 W
regardless of the assigned power level. Therefore, it is
recommended not to enable the LED Driver too soon.
Note that it will typically take around 35 ms to charge the
port capacitance on NCL31010REFGEVB to the PSE
voltage. So, waiting at least 60 ms to enable the LED driver
should be sufficient.
LED Driver
The LED driver is enabled when the LED_EN bit 1 in the
Control Register (&CTRL 0x04) is set.
The LED driver will regulate the LED current based on
the voltage on its DIM pin when digital output pin ~D6
(leading to its PWM pin) is high and the IDIM_EN bit 7 in
the LED Internal DIM Control Register (&INTDIM 0x40)
is cleared.
The LED current sense resistor on NCL31010REFGEVB
is made by the parallel connection of 220 mW(R61) and 1 W
(R62), resulting in an equivalent LED current sense resistor
of 180.3 mW. Therefore, the relationship between the LED
current (in A) and the DIM pin voltage (in V) is given by the
formula below:
ILED +183
242 @ǒVDIM *0.201Ǔ
It is advised to keep the DIM pin voltage between 0.2 V
and 2.052 V for a dimming range from 0% to 100%. When
modulating the LED current at a frequency beyond human
perception, the range can be temporarily extended to around
2.33 V. Do NOT apply any voltages higher than VREF
(2.4 V) on the DIM pin of NCL31010 when the LED
driver is enabled and regulating the LED current based
on the DIM pin voltage.
In general, a microcontroller can use two types of
peripherals to generate an analog output to control the DIM
pin voltage for analog dimming:
•a Digital−to−Analog Converter (DAC)
•a Timer generating a PWM wave
These two analog dimming methods will be described in
further detail in the following two sections.
Analog Dimming – DAC to VDIM
If available within the microcontroller, the easiest way to
implement Analog Dimming is to use a Digital−to−Analog
Converter (DAC). When using the DAC for Analog
Dimming, put the jumper on header P15 in the right position.
The analog dimming voltage can be routed to
connector/header P13 (labeled “DAC”) on the Arduino
Adapter Shield with an additional wire. For some
microcontroller boards (e.g. STM32 Nucleo) it is also
possible to route the analog dimming voltage on pin D13 or
pin A2 of the Arduino Headers. The position of the jumper
on header P12 determines the selection of the analog input
on the Arduino Adapter Shield: the right position selects
D13, the left position selects A2 and the center position
selects connector/header P13.

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The table below shows the relationship between the DAC
value, the DIM voltage and the LED current when using a
12−Bit DAC with a 3.3 V Reference.
Table 3. ANALOG DIMMING VIA A 12−BIT 3.3 V DAC
DAC Value Bit [11:0]
V
DIM
(V)
I
LED
(mA)
2547
2.052
1400
1891
1.524
1000
1398
1.126
700
1070
0.862
500
824
0.664
350
660
0.532
250
537
0.433
175
268
0.216
11.3
255
0.205
3.36
When modulating the DAC voltage at a frequency beyond
human perception, it is possible to transmit data using
visible light as a carrier. E.g. altering the DAC so that the
DIM voltage increases/decreases with 0.215 V will result in
a 163 mA increase/decrease of the LED current.
It is possible to adjust the DAC voltage with a resistor
divider by shorting solder bridge SB1 on the bottom side of
the Arduino Adaptor Shield. This resistor divider would
scale down the DAC voltage with a factor 26/33 (a 3.3 V
DAC range is converted into a 2.6 V range) and load the
DAC with 4.95 kW.
When developing your own system, it is recommended to
connect the VREF pin of NCL31010 to the Reference input
of the DAC.
Analog Dimming – PWM to VDIM
The most general way to implement Analog Dimming is
to use a lowpass filtered PWM wave as even the simplest
microcontrollers contain multiple timers. When using a
Timer generated PWM wave for Analog Dimming, put the
jumper on header P15 in the left position.
On the Arduino Adapter Shield, the PWM wave on digital
output pin ~D9 is first converted to a 2.4 V level digital
signal by buffer (U7) − supplied by the NCL31010
Reference Voltage VREF − and then filtered before it is
going to the NCL31010 DIM pin. The filter can be
approximated by a 7.23 Hz first order lowpass filter (time
constant R10⋅C1). It is advised to use a PWM frequency of
at least 1 kHz. The relationship between the DIM pin voltage
(in V) and the PWM Duty Cycle (in %) is given by the
formula below:
VDIM +DutyCycle%
100 @2.4
The table below shows the LED current and the DIM
voltage corresponding to some specific PWM duty cycle
values.
Table 4. ANALOG DIMMING VIA PWM
PWM Duty Cycle (%)
V
DIM
(V)
I
LED
(mA)
85.5
2.052
1400
63.48
1.524
1000
46.93
1.126
700
35.92
0.862
500
27.66
0.664
350
22.16
0.532
250
18.03
0.433
175
9
0.216
11.3
8.56
0.205
3.36
When modulating the duty cycle of a second Timer at a
frequency beyond human perception, it is also possible to
transmit data using visible light as a carrier. The PWM wave
generated by this second Timer is filtered and injected in the
DIM interface circuit through an AC−coupling capacitor
(C3) on the Arduino Adapter Shield. When using this second
Timer for transmitting data, make sure the jumper on header
P16 is in the right position.
On the Arduino Adapter Shield, the PWM wave on digital
output pin ~D5 is first converted to a 3.3 V level digital
signal by buffer (U9) and then bandpass filtered and scaled
down with a factor 0.261 before it is going to the NCL31010
DIM pin. It is advised to use a PWM frequency of at least
500 kHz on digital pin ~D5 to keep the ripple on the
NCL31010 DIM pin at a reasonable level.
The relationship between the AC DIM pin voltage (in V)
on NCL31010 and the AC PWM Duty Cycle (in %) on pin
~D5 is given by the formula below:
"DVDIM [" DDutyCycle%
100 @0.8613
So, a 25% increase in duty cycle (e.g. applying 75% while
the average is 50%), results in a 0.215 V DIM voltage
increase and a 163 mA LED current increase.
Likewise, a 25% decrease in duty cycle (e.g. applying
25% while the average is 50%), results in a 0.215 V DIM
voltage decrease and a 163 mA LED current decrease.
When not using any data transmission, it is possible to
disconnect the second timer from the Analog Dimming
circuit by putting the jumper on header P16 in the left
position.

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NTC
The temperature sensor on the LED module – if available
− can be connected to NCL31010REFGEVB on connector
J6 (labeled NTC).
Interrupt
When an interrupt is triggered in NCL31010, its INTB
will be pulled low. The microcontroller can read the status
of INTB on digital input pin D2 if it enables the internal
pull−up on this input.
The occurrence of an interrupt can be verified by the red
LED (LED3) on the NCL31010REFGEVB. Whether this
LED remains on until the status transition registers have
been read or is only pulsed briefly depends on the INTCFG
bit 7 in the Control Register (&CTRL 0x04).
Warm Reboot
The NCL31010 has an internal DIM DAC that can be used
to maintain the programmed light output while updating the
microcontroller firmware. The LED Driver will regulate the
LED current based on the internal DIM DAC value when
digital output pin ~D6 (leading to its PWM pin) is kept high
and the IDIM_EN bit 7 in the LED Internal DIM Control
Register (&INTDIM 0x40) is set. The LED currents
corresponding to some internal 7−Bit DIM DAC values – set
by the lower 7 bits of the LED Internal DIM Control Register
(&INTDIM 0x40) − are given in Table 5.
Table 5. INTERNAL DIM
INTDIM Bit [6:0]
I
LED
(mA)
108
1393
80
996
59
699
45
500
34
344
27
245
22
174
11
18
10
4
Advanced Powering Options
As mentioned before, the Arduino Adapter Shield has an
on−board 4.6 V DC/DC converter that can be used to power
the microcontroller board if no jumper is mounted on header
P18. This allows the complete system to be powered by
Power−over−Ethernet.
This 4.6 V supply is connected to the +5V with a series
diode, so the USB voltage – if present as well − will have
higher priority.
If one prefers to only power the microcontroller board
over its USB port, one can disable the 4.6 V converter on the
Arduino Adapter Shield by placing a jumper on header P18
or by mounting a 0E jumper on position R53 on the bottom
side of the Arduino Adapter Shield.
If the microcontroller is programmed to enable the VDD2
regulator and if a jumper is placed header P17, it is possible
to power the microcontroller board from the 5 V VDD2
supply after it was powered from the 4.6 V supply initially
during system startup. Then initially no jumper should be
mounted on header P18, but − once the VDD2 regulator has
taken over − one can mount a jumper on header P18 to
disable the 4.6 V supply afterwards.
Instead of mounting a jumper on header P17 it is also
possible to short solder bridge SB3 on the bottom side of the
Arduino Adapter Shield.
Finally, microcontroller boards with 3.3 V operating
voltage that consume less than 125 mA on the 3.3 V supply
can be powered directly from the NCL31010 3.3V VDD
regulator by mounting a 0E jumper on position R41 on the
bottom side of the Arduino Adapter Shield. This will
generally require hardware modifications to be performed
on the microcontroller board as well.
When developing your own system, the microcontroller
as well as the Ethernet PHY incorporating a voltage mode
line driver should be powered from the NCL31010 3.3V
VDD regulator.
Requested Power
As mentioned before, the NCL31010REFGEVB will
request Class 6 during Physical Layer classification. If a
lower Class or power level is preferred, resistor R59
(“CLB”) and/or resistor R57 (“CLA”) should be changed;
both resistors are located on the bottom side. See the
NCL31010 datasheet for the nominal resistance values.
The Class the PD is actually assigned to is always limited
to the requested Class.
Autoclass
The NCL31010REFGEVB will by default not request
Autoclass during Physical Layer classification. If the PD
should request Autoclass, remove 0E resistor R60 on the top
side.
LED Current/Power
NCL31010REFGEVB is optimized for 0.65 A to 1.4 A
LED loads, but can easily support lower and higher current
LED loads when changing the LED current sense resistor
(R61//R62) and the LED Buck Inductor (L6).
For higher current LED loads, it might be necessary to
mount an additional input capacitor (C56), and to lower the
switching frequency through the LED Frequency Control
Register (&LEDFC 0x41) as well as to alter the Top Mosfet
(Q6).
The board facilitates the design of applications up to 90 W.

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ST NUCLEO−F207ZG – PWM to VDIM
The STM32 Nucleo−F207ZG development board − based
on the STM32F207 Cortex−M3 microcontroller with
10/100 Ethernet MAC − has a 3.3 V operating voltage and
an Arduino Uno R3 compatible interface.
The connection to the on−board PHY LAN8742A is via
a Reduced Media−Independent Interface (RMII).
The Microchip LAN8742A is a 10BASE−T/100BASE−TX
Ethernet physical layer transceiver incorporating
current−mode transmit drivers.
Figure 3. Operational NCL31010GEVK on NUCLEO−F207ZG using PWM for Analog Dimming
The user can remove the jumper from JP3 on the
Nucleo−F207ZG to make sure the Nucleo−F207ZG only
gets powered from Power−over−Ethernet. Likewise, the
user could mount jumpers in the center position of JP3 on the
Nucleo−F207ZG and on P18 on the Arduino Adapter Shield
to make sure the Nucleo−F207ZG only gets powered from
the USB ST−Link.
Don’t forget to mount the jumpers on both JP6 (CRS_DV)
and JP7 (TXD1) of Nucleo−F207ZG when using Ethernet.
The timer(s) within STM32F207 that can be used to
control the NCL31010 DIM pin are listed in Table 6.
When using a second Timer for transmitting data, make
sure the jumper on header P16 is changed to the right
position.
Table 6. STM32F207 CONFIGURATION USING PWM FOR ANALOG DIMMING
UNO R3
Pin NCL31010 Pin Name
STM32F207ZG
Pin Name
Signal
Peripheral
Function
SCL
SCL
PB8
I2C1_SCL
I2C interface 1
Serial Clock Line
SDA
SDA
PB9
I2C1_SDA
Serial Data Line
~D9
DIM (DC)
PD15
TIM4_CH4 (OC4)
general purpose Timer 4
Output Compare channel 4
~D6
PWM
PE9
TIM1_CH1 (OC1)
advanced−control Timer 1
Output Compare channel 1
~D5
DIM (AC)
PE11
TIM1_CH2 (OC2)
advanced−control Timer 1
Output Compare channel 2
D2
INTB
PF15
EXTI15
(External Interrupt/event Controller)
EXTernal Interrupt line 15 interrupt
A0
VREF
PA3
ADC123_IN3
Analog−to−Digital Converter 1,2,3
analog INput channel 3

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ST NUCLEO−F207ZG – DAC to VDIM
The STM32 Nucleo−F207ZG development board − based
on the STM32F207 Cortex−M3 microcontroller with
10/100 Ethernet MAC − has a 3.3 V operating voltage and
an Arduino Uno R3 compatible interface.
The connection to the on−board PHY LAN8742A is via
a Reduced Media−Independent Interface (RMII).
The Microchip LAN8742A is a 10BASE−T/100BASE−TX
Ethernet physical layer transceiver incorporating
current−mode transmit drivers.
Figure 4. Operational NCL31010GEVK on NUCLEO−F207ZG using a DAC for Analog Dimming
The user can remove the jumper from JP3 on the
Nucleo−F207ZG to make sure the Nucleo−F207ZG only
gets powered from Power−over−Ethernet. Likewise, the
user could mount jumpers in the center position of JP3 on the
Nucleo−F207ZG and on P18 on the Arduino Adapter Shield
to make sure the Nucleo−F207ZG only gets powered from
the USB ST−Link.
Don’t forget to mount the jumpers on both JP6 (CRS_DV)
and JP7 (TXD1) of Nucleo−F207ZG when using Ethernet.
The reference input of the DAC is the VREF+ pin, which
is hard wired to the VDDA pin and connected to the +3.3V
supply through a bead on the Nucleo−F207ZG.
When developing your own system, it is recommended to
connect the VREF+ pin of STM32F207 to the VREF pin of
NCL31010.
Table 7. STM32F207 CONFIGURATION USING A DAC FOR ANALOG DIMMING
UNO R3
Pin NCL31010 Pin Name
STM32F207ZG
Pin Name
Signal
Peripheral
Function
SCL
SCL
PB8
I2C1_SCL
I2C interface 1
Serial Clock Line
SDA
SDA
PB9
I2C1_SDA
Serial Data Line
~D13
DIM
PA5
DAC_OUT2
Digital−to−Analog Converter
analog OUTput channel 2
~D6
PWM
PE9
TIM1_CH1 (OC1)
advanced−control Timer 1
Output Compare channel 1
D2
INTB
PF15
EXTI15
(External Interrupt/event Controller)
EXTernal Interrupt line 15 interrupt
A0
VREF
PA3
ADC123_IN3
Analog−to−Digital Converter 1,2,3
analog INput channel 3

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Microchip SAM E54 Curiosity Ultra − PWM to VDIM
The SAM E54 Curiosity Ultra development kit − based on
the ATSAME54P20A Cortex−M4F microcontroller with
10/100 Ethernet MAC − has a 3.3 V operating voltage and
an Arduino Uno R3 compatible interface.
The connection to the KSZ8061 PHY Daughter Board is
via a Reduced Media−Independent Interface (RMII).
The Microchip KSZ8061 is a 10BASE−T/100BASE−TX
Ethernet physical layer transceiver incorporating
voltage−mode transmit drivers and on−chip terminations.
Figure 5. Operational NCL31010GEVK on SAM E54 Curiosity Ultra using PWM for Analog Dimming
The development board has a Serial EEPROM and a
Temp Sensor connected to the I2C bus which is shared with
the MDC/MDIO Management Interface of the PHY.
The development kit provides a 1k pull−up resistor on
SCL and an equivalent 500 Wpull−up resistor on SDA.
Therefore, it is recommended to disable the pull−ups on the
Arduino Adapter Shield by mounting a jumper on P8. The
timer(s) within ATSAME54 that can be used to control the
NCL31010 DIM pin are listed in Table 8.
When using a second Timer for transmitting data, make
sure the jumper on header P16 is changed to the right
position.
Table 8. ATSAME54 CONFIGURATION USING PWM FOR ANALOG DIMMING
UNO R3
Pin NCL31010 Pin Name
ATSAME54P20A
Pin Name
Signal
Peripheral
Function
SCL
SCL
PD08
SERCOM6/PAD[1]
SERial COMmunication interface 6
Serial Clock Line
SDA
SDA
PD09
SERCOM6/PAD[0]
Serial Data Line
~D9 DIM (DC) PB16
TC6/WO[0]
basic Timer Counter 6
Waveform Output 0
TCC3/WO[0]
Timer Counter Control 3
compare channel 0 Waveform Output
~D6 PWM PB15
TC5/WO[1]
basic Timer Counter 5
Waveform Output 1
TCC4/WO[1]
Timer Counter Control 4
compare channel 1 Waveform Output
~D5 DIM (AC) PB14
TC5/WO[0]
basic Timer Counter 5
Waveform Output 0
TCC4/WO[0]
Timer Counter Control 4
compare channel 0 Waveform Output
D2
INTB
PD10
EIC/EXTINT[5]
External Interrupt Controller
External Interrupt pin 5
A0
VREF
PA03
ADC0/AIN[1]
Analog−to−Digital Converter 0
Analog INput channel 1

NCL31010GEVK
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9
Microchip SAM E54 Curiosity Ultra – DAC to VDIM
The SAM E54 Curiosity Ultra development kit − based on
the ATSAME54P20A Cortex−M4F microcontroller with
10/100 Ethernet MAC − has a 3.3 V operating voltage and
an Arduino Uno R3 compatible interface.
The connection to the KSZ8061 PHY Daughter Board is
via a Reduced Media−Independent Interface (RMII).
The Microchip KSZ8061 is a 10BASE−T/100BASE−TX
Ethernet physical layer transceiver incorporating
voltage−mode transmit drivers and on−chip terminations.
Figure 6. Operational NCL31010GEVK on SAM E54 Curiosity Ultra using a DAC for Analog Dimming
The development board has a Serial EEPROM and a
Temp Sensor connected to the I2C bus which is shared with
the MDC/MDIO Management Interface of the PHY.
The development kit provides a 1k pull−up resistor on
SCL and an equivalent 500 Wpull−up resistor on SDA.
Therefore, it is recommended to disable the pull−ups on the
Arduino Adapter Shield by mounting a jumper on P8.
An additional wire is required to connect the DAC output
on DAC_OUT to P13 on the Arduino Adapter Shield.
The reference input of the DAC can be either the
VDDANA pin, which is connected to the +3.3V supply
through a bead, or the 2.4 V or 2.5 V INTREF.
When developing your own system, it is recommended to
connect the VREF pin of NCL31010 to an Ext ref input.
Table 9. ATSAME54 CONFIGURATION USING A DAC FOR ANALOG DIMMING
UNO R3
Pin DAC_OUT Pin NCL31010 Pin Name
ATSAME54P20A
Pin
Name
Signal
Peripheral
Function
SCL
—
SCL
PD08
SERCOM6/PAD[1]
SERial COMmunication interface 6
Serial Clock Line
SDA
—
SDA
PD09
SERCOM6/PAD[0]
Serial Data Line
~D6
—
PWM PB15
TC5/WO[1]
basic Timer Counter 5
Waveform Output 1
—
TCC4/WO[1]
Timer Counter Control 4
compare channel 1 Waveform Output
D2
—
INTB
PD10
EIC/EXTINT[5]
External Interrupt Controller
External Interrupt pin 5
A0
—
VREF
PA03
ADC0/AIN[1]
Analog−to−Digital Converter 0
Analog INput channel 1
—
DAC0
DIM
PA02
DAC/VOUT[0]
Digital−to−Analog Converter
analog Voltage OUTput 0
—
DAC1
PA05
DAC/VOUT[1]
Digital−to−Analog Converter
analog Voltage OUTput 1

NCL31010GEVK
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10
Arduino Uno − PWM to VDIM
Both the Arduino Uno Rev3 SMD and the Arduino Uno
Rev3 boards are based on the ATmega328P AVR
microcontroller and have a 5 V operating voltage.
The connection to the Arduino Ethernet Shield 2 is via the
Serial Peripheral Interface (SPI) over the ICSP Header
(Clock and Data) and the Arduino Interface (/SS).
The Arduino Ethernet Shield 2 is based on the WIZnet
W5500 Ethernet chip that incorporates current−mode
transmit drivers and provides a network (IP) stack capable
of both TCP and UDP.
Figure 7. Operational NCL31010GEVK on Arduino UNO R3 and Arduino Ethernet Shield 2
The Arduino Ethernet Shield 2 generates an internal +3V3
supply from +5V with NX1117CE33Z (IC2) to power the
W5500 Ethernet chip (IC6). The dropout voltage of this
regulator is rather high (around 1 V Typ). When the system
is powered by the converter on the Arduino Adaptor Shield,
the voltage on the +5V rail will be around 4.3 V and it is
recommended to check to if the +3V3 supply on Arduino
Ethernet Shield 2 doesn’t drop below the W5500 Minimum
Supply Voltage: i.e. 2.93 V. The timer(s) within
ATmega328P that can be used to control the NCL31010
DIM pin are listed in Table 10.
When using a second Timer for transmitting data, make
sure the jumper on header P16 is changed to the right
position.
Table 10. ATmega328P CONFIGURATION
UNO R3
Pin NCL31010 Pin Name
ATmega328P
Pin Name
Signal
Peripheral
Function
SCL
SCL
PC5
SCL
2−wire Serial Interface (TWI)
Serial Clock Line
SDA
SDA
PC4
SDA
Serial Data Line
~D9
DIM (DC)
PB1
OC1A
16−bit Timer/Counter1
Output Compare match A output
~D6
PWM
PD6
OC0A
8−bit Timer/Counter0
Output Compare match A output
~D5
DIM (AC)
PD5
OC0B
8−bit Timer/Counter0
Output Compare match B output
D2 INTB PD2
INT0
external INTerrupt 0 input
PCINT18
Pin Change INTerrupt 18
A0
VREF
PC0
ADC0
Analog−to−Digital Converter
input channel 0