ON Semiconductor SECO-NCV7685RGB-GEVB User manual

©Semiconductor Components Industries, LLC, 2020
May, 2020 −Rev. 1
1Publication Order Number:
EVBUM2713/D
SECO-NCV7685RGB-GEVB
NCV7685 RGB Lighting
Evaluation Board User's
Manuals
Description
SECO−NCV7685RGB−GEVB is an evaluation board for RGB
LEDs lighting application with BLE in automotive which driven by
NCV7685 and controlled by RSL10. It is also an interior or exterior
lighting reference design for tail or ambient lights to realize general
sequential or high end pixelated LEDs controlling in−vehicle network.
The user can set RGB LED’s color and intensity by mobile APP to
show customized information or animation.
In general, the user prefers to use fixed address in multiple
NCV7685 applications. It leads to additional procedure to
pre−program each chips’ address in mass production stage. In
addition, it is inconvenient for maintenance in the aftermarket. In
firmware of this evaluation board, it uses floating address setting
method, each time when power on the board, NCV7685 will be
assigned an address which is defined by user, but it’s not locked into
OTP registers. The user can realize this function by using either
RSL10’s GPIO or IO expender (PAC9655).
In firmware, the driver APIs are divided into four levels: Peripheral,
Chip, Board and customer application. User can directly include the
chips and board APIs in their own project, and modify the application
APIs according to their applications. This will accelerate developing
period to market.
The board conceived for use as a plug and play environment to
testing.
Nominal supply voltage is 12 V (Supply voltage range 12−24 V). In
switch mode, four fixed animations shown; the RGB LEDs’ color and
intensity setting by user mobile APP in BLE mode.
Features
•Plug and Play; Switch and BLE Mode to Show Animations
•16 RGB LEDs (48 Channels), each Current Programmable Sources
up to 60 mA
•Independent PWM Duty Cycle Control for each Channel
•On−Chip 150, 300, 600 and 1200 Hz PWM
•Logarithmic or linear independent PWM dimming
•Diagnostic and Protection against Open Load and Under−Voltage,
Over Temperature…
•Dynamic Addressing Method for No−Worries in mass production
•Bluetooth®5 Certified with LE 2M PHY Support
•Rx Sensitivity (Bluetooth Low Energy Mode, 1 Mbps): −94 dBm
•Transmitting Power: −17 to +6 dBm
•Arm Cortex−M3 Processor and LPDSP32
•AEC−Q100 Qualified and PPAP Capable
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Architecture and Key Parts
Figure 1. Board Architecture
KEY PARTS
Chip Part Description
NCV7685 12 Channels 60 mA LED Linear Current Driver I2C Controllable for Automotive
RSL10 SIP System−in−Package, Bluetooth 5 Certified
PCA9655 Remote 16−bit I/O Expander for I2C Bus with Interrupt
NCV8170 Ultra‐Low IQ 150 mA CMOS LDO Regulator
NCV891330 3 A, 2 MHz Low−IQ Dual−Mode Step−Down Regulator for Automotive

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Figure 2. Top and Bottom Layer and Key Components
Operations of NCV7685 RGB LEDs Board
After power on, the board shows the “Welcome”
animation, then according to the setting of the switch, the
board shows four kinds of fixed animations or turns into
BLE mode. The functions and operations descripted as
below figures:
Figure 3. Sequence after Power On

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Switch Setting:
Figure 4. Status Indicator Mode
Status Indicator Mode:
Keep all Switches off; the board comes into status
indicator mode. Green means good, orange means warning
and red means error. The color of LEDs changes in gradient
from green to orange, then to red; and goes back from red to
green. This can be used as the status indicator for dashboard.
Switch Setting:
Figure 5. Second Clock Mode
Second Clock
Keep Switch S1 on and S2, S3, S4 off, every second, only
one LED in blue lights up clockwise direction in turn.
Switch Setting:
Figure 6. Flash Mode
Flash Mode
Keep Switch S2 on and S1, S3, S4 off, all LEDs flash in
red.
Switch Setting:
Figure 7. Fading Mode
Fading Mode
Keep Switch S1, S2 on and S3, S4 off, all LEDs fade in
green.
Switch Setting:
Figure 8. BLE Mode
Figure 9. Standby interface in BLE Mode

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BLE Mode
Keep Switch S4 on and never mind of the setting of S2, S3,
S4, the board turns into BLE mode. User can use general
mobile App to control LED’s color and intensity for
individual or all LEDs. For example, using “Light Blue” in
iOS®; “BLE Scanner” or “nRF Connect” in Android®OS.
It shows a green “smile face” firstly, and then changes the
color and intensity according to the received five bytes data
through BLE. The first three bytes stand for R, G, B values
to mix the color, and the fourth data stands for intensity (4
level brightness For V1). The fifth byte stands for LED
number, if this value is greater than 0x0f, all LEDs response.
Here are several examples:
Examples: (R, G, B, I, LED_No)
(Four level of Intensity, Depends on Firmware)
800080FF00: LED0 in Purple
FF00003F01: LED1 in Red
XXXXXX0010: All LEDs turn off as the he intensity is 0
(Never mind RGB’s values)
00BFFFFF10: All LEDs in deep sky blue
Here is an example using “Light Blue” App to control
RGB lighting board:
1. Find and choose Peripheral of “NCV7685 RGB
Kit”
2. Tap “Send RGB Setting” character
3. Set RGB and Intensity values
4. The board change color, intensity and LED_No
Figure 10. Using ‘Light Blue’ App to Control the Board

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Firmware Setting
Generally, floating address method is used in firmware;
the configurations can changed in the “ncv7685.h” file. Here
are options:
1. Floating Address method using SOC GPIO:
#define NCV7675_CHIPS_NUM 0x04 /* Chips number */
#define PCA9655_Address 0x22 /* PCA9655 I2C address */
#define BY_SOC 0 /* SOC or PCA9655 */
#define BY_PCA9655 1
#define ADDRESS_SETTING BY_SOC
#define Fix_Address 0
#define Address_Had_Set 0
2. Floating Address method using PCA9655:
#define NCV7675_CHIPS_NUM 0x04 /* Chips number */
#define PCA9655_Address 0x22 /* PCA9655 I2C address */
#define BY_SOC 0 /* SOC or PCA9655 */
#define BY_PCA9655 1
#define ADDRESS_SETTING BY_PCA9655
#define Fix_Address 0
#define Address_Had_Set 0
3. Fix Address method using PCA9655 or SOC GPIO:
#define NCV7675_CHIPS_NUM 0x04 /* Chips number */
#define PCA9655_Address 0x22 /* PCA9655 I2C address */
#define BY_SOC 0
#define BY_PCA9655 1
#define ADDRESS_SETTING BY_PCA9655 /* SOC or PCA9655 */
#define Fix_Address 1
#define Address_Had_Set 0
4. For the board which address had programmed, just set “Address_Had_Set” to 1, So it will skip address setting
function:
#define NCV7675_CHIPS_NUM 0x04 /* Chips number */
#define PCA9655_Address 0x22 /* PCA9655 I2C address */
#define BY_SOC 0
#define BY_PCA9655 1
#define ADDRESS_SETTING BY_PCA9655 /* SOC or PCA9655 */
#define Fix_Address 1
#define Address_Had_Set 1
Files Structure of Project
Figure 11. Files Structure of Project
·app_basc.c: Battery level indication handler
·app_bass.c: Battery Service code
·app_config.c: Application configuration source file
·app_customss.c: Bluetooth custom service
·app_msg_handler.c: Customer defined functions and data
·app_trace.c: Trace functions
·ncv7685.c: APIs of NCV7685 Chip and Board
·app.c: main function

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Flow Chart of App.c
Figure 12. Flow chart of App.c

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Schematic
Figure 13. Schematic of Board

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Assembly
Figure 14. Bottom Side Assembly

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Table 1. BILL OF MATERIALS
Item Designator Manufacturer Comment Description Quantity
1C1, C4, C5, C8, C9,
C10, C11, C12, C13,
C14, C15
−10 V, 100 nF WCAP−CSGP Ceramic
Capacitors, 0603
11
2 C2 −25 V, 10 mFWCAP−CSGP Ceramic
Capacitors, 1206
1
3 C3 −25 V, 4.7 mFWCAP−CSGP Ceramic
Capacitors, 1206
1
4 C6 −10 V, 10 mFWCAP−CSGP Ceramic
Capacitors, 1206
1
5 C7 −10 V, 100 nF WCAP−CSGP Ceramic
Capacitors, 1206
1
6 D1 ON Semiconductor BAS16H Schottky Barrier Diode, 1
7D3, D4 ON Semiconductor NTS560 Trench Schottky Rectifier,
Low Forward Voltage, 60 V,
5 A
2
8 J1 −694106106102 DC Power Jack Connector,
5 A, 24 V
1
9 J5 −1.27mm_SMD_Vertical_10 pin Pin Header WR−PHD,
pitch 1.27 mm,
1
10 L1 −2.2 mH, 4.7 A SMT Shielded Power
Inductor
1
11 LED11, LED12,
LED13, LED14,
LED21, LED22,
LED23, LED24,
LED31, LED32,
LED33, LED34,
LED41, LED42,
LED43, LED44
−LRTB GVSG −16
12 R1, R4, R5, R12,
R13, R14, R18, R20,
R21
−10 kW(1002) ±1% Chip Resistor 9
13 R2, R3 −0 W(0R0) ±1% ’Chip Resistor 2
14 R6, R7, R8, R9, R23,
R24
−68 W(68R0) ±1% ’Chip Resistor 6
15 R10 −2.7 kW(2701) ±1% ’Chip Resistor 1
16 R11 −10 W(10R0) ±1% ’Chip Resistor 1
17 R15, R22 −100 kW(1003) ±1% ’Chip Resistor 2
18 R16, R17 −1.5 kW(1501) ±1% ’Chip Resistor 2
19 R25, R26, R27, R28 −2 kW(2001) ±1% ’Chip Resistor 4
20 SW1 −434133025816 4.2x3.2 mm J−Bend SMD
Tact Switch
1
21 SW2 −416131160804 SMD Dip Switch 1
22 U1 ON Semiconductor NCV891330PD38R2G −1
23 U2 ON Semiconductor PCA9655EMTTXG −1
24 U3, U4, U5, U6 ON Semiconductor NCV7685G −4
25 U7 ON Semiconductor RSL10−SIP −1
25 U8 ON Semiconductor NCV8170BMX330TCG −1
Android is a registered trademark of Google LLC.
Bluetooth is a registered trademark of Bluetooth SIG.
iOS is a trademark or registered trademark of Cisco in the U.S. and other countries and is used under license by Apple Inc.