Texas Instruments LM36923HEVM User manual

Using the LM36923HEVM Evaluation Module
User's Guide
Literature Number: SNVU509
January 2016

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Table of Contents
Contents
1 Introduction......................................................................................................................... 5
2 Setup.................................................................................................................................. 6
2.1 Input/Output Connector Description ................................................................................... 6
2.2 Setup....................................................................................................................... 7
2.3 Operation.................................................................................................................. 7
3 Board Layout....................................................................................................................... 8
4 Schematic ......................................................................................................................... 11
5 USB Interface Board and I2C-Compatible Interface Program.................................................... 13
5.1 User Interface ........................................................................................................... 13
5.2 LM36923H Software Reset............................................................................................ 14
5.3 LM36923H Fault Flags................................................................................................. 15
5.4 PWM Pin Control ....................................................................................................... 16
5.5 ASEL Pin Control....................................................................................................... 17
5.6 History & Macro Tab ................................................................................................... 18
5.7 Individual register read/write access ................................................................................. 19
5.8 Macro Example ......................................................................................................... 20
5.9 Updating USB2ANY Firmware........................................................................................ 23

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List of Figures
List of Figures
1 LM36923HEVM Photo ...................................................................................................... 5
2 VIO Jumper Settings ........................................................................................................ 6
3 ASEL Jumper Settings...................................................................................................... 6
4 OUT Jumper Settings ....................................................................................................... 7
5 HL1, HL2, HL3 star jumper configuration settings....................................................................... 7
6 Jumper Configuration ....................................................................................................... 8
7 Top Assembly Layer......................................................................................................... 9
8 Middle Layer 1 Routing ..................................................................................................... 9
9 Middle Layer 2 Routing.................................................................................................... 10
10 Bottom Assembly Layer (MIRRORED).................................................................................. 10
11 LM36923EVM Schematic ................................................................................................. 11
12 LM36923H General User Interface ...................................................................................... 13
13 LM36923H Software Reset .............................................................................................. 14
14 Fault Flags .................................................................................................................. 15
15 PWM Input Pin Control .................................................................................................... 16
16 ASEL Input Pin Control.................................................................................................... 17
17 GUI History following Read All button clicked.......................................................................... 18
18 Register read/write access................................................................................................ 19
19 Example macro............................................................................................................. 20
20 Example macro loaded (tool tip enabled)............................................................................... 21
21 Example macro message box............................................................................................ 22
22 USB2ANY firmware unknown update ................................................................................... 23
23 USB2ANY firmware update step 1....................................................................................... 23
24 USB2ANY firmware update step 2 ...................................................................................... 24
25 USB2ANY firmware update complete .................................................................................. 24

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List of Tables
List of Tables
1 Device and Package Configurations ...................................................................................... 5
2 Bill of Materials ............................................................................................................. 12
3 Macro commands .......................................................................................................... 20

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LM36923HEVM User's Guide
User's Guide
SNVU509–January 2016
LM36923HEVM User's Guide
1 Introduction
The Texas Instruments LM36923HEVM evaluation module (EVM) helps designers evaluate the operation
and performance of the LM36923H Highly Efficient Triple-String White LED driver. The device offers
configurability via I2C-compatible interface. The EVM contains six dual-LED and a single LED per string
which can be easily configured to support 1, 2 or 3 parallel LED strings with 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
or 13 series LEDs.
Notes:
1) Not all combinations of VIN, LED strings and Number of Series LEDs are supported by the
LM36923H. Refer to the data sheet to ensure the proper configuration.
2) The dual-LED are very bright, they are not diffused and are capable of ~21 lumens per package.
Appropriate LED light diffusion or eye protection must be provided by the user.
The EVM contains one LED Backlight Driver (See Table 1).
Table 1. Device and Package Configurations
LED DRIVER IC PACKAGE
U1 LM36923H 0.4 mm-pitch, 12-Bump DSBGA
Figure 1. LM36923HEVM Photo

USB2ANY
Control ASEL = VIN ASEL = GND
1
2
3
4
1
2
3
4
1
2
3
4
VUSB VIO VL
VUSB
Connection
VUSB VIO VL
VL
Connection
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2 Setup
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the LM36923HEVM.
2.1 Input/Output Connector Description
VL/GND-These are the power input terminals for the driver. The terminal block provides a power (VIN)
and ground (GND) connection to allow the user to attach the EVM to a cable harness.
VUSB VIO VL - This pin provides power for the I2C and HWEN pullup resistors (RSCL, RSDA, RHWEN).
It is recommended that this pin is connected to the VIN pin. If desired, it can be connected to the
USB2ANY 3.3-V line provided by the USB interface connector. When VIO is connected to VIN
communication via the I2C interface may not be possible if the supply voltage to the LED driver is below
approximately 3 V.
Figure 2. VIO Jumper Settings
SDA SCL - These connections allow the user to externally control the I2C lines. For independent control of
the I2C lines, do not connect the VIO jumper to either the 3.3 V or the VIN pin.
HWEN - This is the jumper used to enable the LED driver (HWEN pin). The driver will be enabled when
the HWEN pin is high (VIO) and disabled when it is low (GND).
VL VIN - The user can measure the Backlight Driver Input Current by omitting this jumper and inserting a
current meter between pins 1 (VIN) and 2 (VL).
ASEL - This connector provides a method for controlling the ASEL input to configure the I2C slave
address. A jumper is required to operate the EVM. The LM36923HEVM GUI provides a method for setting
ASEL when a jumper is inserted between pins 2 and 4. When a jumper is inserted between pins 1 and 2
ASEL is connected to VIO through a 4.7-kΩresistor (RA1). When a jumper is inserted between pins 2 and
3 ASEL is connected to GND through a 4.7-kΩresistor (RA0).
Figure 3. ASEL Jumper Settings
PWM - This pin provides a method for connecting either the USB2ANY or an external signal generator to
the PWM input. The PWM pin is connected to ground via a 4.7-kΩresistor (RPWM). The LM36923HEVM
GUI provides a method for generating a PWM signal when a jumper is placed between connector pins 1
and 2. When connecting an external signal generator remove the jumper between pins 1 and 2 and
connect the signal generator to pin 1 and GND.
OUT - This connector provides a way to disconnect the output voltage to each LED string and access to
the regulated output of the driver. The user can measure VOUT with reference to GND while connecting
and disconnecting the LED strings.

12 series LED 2 series LED 4 series LED 6 series LED 8 series LED 10 series LED 12 series LED
OUT
LED String
Disconnected
OUT
LED+ LED+
LED String
Connected
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Figure 4. OUT Jumper Settings
HL1, HL2, HL3 - This connector provides a star connection to the LED string allowing the user to
configure the LED string for 1, 2, 3, 4, 5 or 6 series dual-LEDs.
Figure 5. HL1, HL2, HL3 star jumper configuration settings
ODD1, ODD2, ODD3 - These connectors provide a method for inserting a single LED in each string.
When the jumper is removed from ODD1, ODD2 ,ODD3 the single LED D107, D207, D307 is part of the
respective LED string. When a jumper is inserted on ODD1, ODD2, ODD3 the single LED D107, D207,
D307 is bypassed in the respective LED string.
ILED1, ILED2, ILED3 -The LM36923HEVM provides a way to accurately measure the LED current
through each LED string on board. Resistors RL1 , RL2 and RL3 (10 Ω) are placed between the cathode
of last LED in each respective string and the LM36923H Current Sink Output.
2.2 Setup
The input voltage range for the backlight driver is 2.5 volts to 5.5 volts. The on-board LEDs or an LED
module should be connected for proper operation.
2.3 Operation
For proper operation of the LM36923HEVM, the jumpers should be properly configured. The
recommended setting, using shorting blocks is:
ASEL to USB2ANY: install jumper between pins 2 and 4
VIO to VIN: install jumper between pins 2 and 3
VL to VIN: jumper installed
OUT to LED+: install jumper between pins 2 and 3.
PWM from USB2ANY: jumper installed
HL1, HL2, HL3: install jumper in position 3 for each string
ODD1, ODD2, ODD3: jumper installed (odd LED bypassed)
Using these settings the device will be configured for USB2ANY control with 2 dual-led (4 LEDs) per
string.

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Figure 6. Jumper Configuration
3 Board Layout
Figure 7,Figure 8,Figure 9 and Figure 10 show the board layout for the LM36923HEVM. The EVM offers
resistors, capacitors, and jumpers to enable the device and to configure it as desired.
The LM36923H will dissipate power, especially during high brightness maintained for a long duration.
Power will also be dissipated on the series LEDs in each LED strings. The EVM layout is designed to
minimize temperature rise during operation, however prolonged usage at high brightness should be
avoided.

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Figure 7. Top Assembly Layer
Figure 8. Middle Layer 1 Routing

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Figure 9. Middle Layer 2 Routing
Figure 10. Bottom Assembly Layer (MIRRORED)

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4 Schematic
Figure 11. LM36923EVM Schematic

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Table 2. Bill of Materials
DESIGNATOR DESCRIPTION MANUFACTURER PART NUMBER QTY
!PCB Printed Circuit Board Any SV601239 1
A1 Header, 100mil, 1pos, Gold, TH Samtec TSW-101-07-G-S 1
ASEL, OUT, SDA SCL, VUSB
VIO VL Header, TH, 100mil, 3x1, Gold plated, 230 mil above insulator Samtec TSW-103-07-G-S 4
CIN CAP, CERM, 2.2uF, 25V, +/-10%, X5R, 0402 TDK C1005X5R1E225K050BC 1
CL CAP, CERM, 22uF, 16V, +/-10%, X5R, 0805 TDK C2012X5R1C226K125AC 1
COUT CAP, CERM, 1uF, 50V, +/-10%, X7R, 0805 TDK C2012X7R1H105K125AB 1
D1 Diode, Schottky, 40V, 0.25A, SOD-523 ON Semiconductor NSR0240V2T1G 1
D101, D102, D103, D104,
D105, D106, D201, D202,
D203, D204, D205, D206,
D301, D302, D303, D304,
D305, D306
LED, White, SMD Samsung SPMWHT325AD5YBTMS0 18
D107, D207, D307 LED, White, SMD Rohm SML312WBCW1 3
GND Standard Banana Jack, Insulated, Black Keystone 6092 1
GND2, HWEN, ILED1, ILED2,
ILED3, J1A, J1C, J2A, J2C,
J3A, J3C, ODD1, ODD2
,ODD3, PWM, VL2, VL VIN
Header, TH, 100mil, 2x1, Gold plated, 230 mil above
insulator Samtec TSW-102-07-G-S 17
H1, H2, H3, H4 Bumpon, Cylindrical, 0.312 X 0.200, Black 3M SJ61A1 4
J1B, J2B, J3B Header, TH, 100mil, 4x1, Gold plated, 230 mil above
insulator Samtec TSW-104-07-G-S 3
L1 Inductor, Shielded, Ferrite, 4.7 µH, 1.83 A, 0.1 ohm, SMD TDK VLF504012MT-4R7M 1
RA0, RA1, RHWEN, RPWM,
RSCL, RSDA RES, 4.7k ohm, 5%, 0.1W, 0603 Vishay-Dale CRCW06034K70JNEA 6
RL1, RL2, RL3 RES, 10.0 ohm, 1%, 0.125W, 0805 Vishay-Dale CRCW080510R0FKEA 3
R1 RES, 0, 5%, 0.1 W, 0603 Vishay-Dale CRCW06030000Z0EA 0
SH-J1, SH-J2, SH-J3, SH-J4,
SH-J5, SH-J6, SH-J7, SH-J8,
SH-J9, SH-J10, SH-J11
Shunt, 100mil, Flash Gold, Black Sullins Connector
Solutions SPC02SYAN 11
U1 Highly Efficient Triple-String White LED Driver,
YFF0012AHAH Texas Instruments LM36923HYFFR 1
USB2ANY Header (shrouded), 100mil, 5x2, Gold, TH TE Connectivity 5103308-1 1
VL Standard Banana Jack, Insulated, Red Keystone 6091 1

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LM36923HEVM User's Guide
5 USB Interface Board and I2C-Compatible Interface Program
Texas Instruments has created an I2C-compatible program and USB docking board (USB2ANY) that can
help exercise the part in a simple way. Contained in this document is a description of how to use the
USB2ANY interface box and interface software.
The LM36923HEVM has the means to “plug into” the USB docking board. The USB docking board
provides all the control signals for the simple interface. Power to the part must be provided externally. A
USB cable (provided) must be connected to the board from a PC.
The I2C-compatible interface program provides all of the control that the LM36923H part requires. For
proper operation, the USB docking board should be plugged into the PC before the interface program is
opened. Once connected, and the program is executed, a basic interface window will open. Figure 12
shows the default settings which are updated after the user clicks the Read All button.
5.1 User Interface
the LM36923H GUI provides the user with access to all of the registers found on the device. Through a
combination of buttons, drop-down boxes and sliders, the user can configure the LM36923H to perform in
the desired mode. Please note that each register is updated when the button, drop-down box, numeric
updown box or slider is changed. Individual register read is completed by clicking the Read button
associated with each register.
Figure 12. LM36923H General User Interface

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5.2 LM36923H Software Reset
Selecting the "Reset" button sends the I2C Software Reset command which sets all registers to their
default values and updates all GUI fields.
Figure 13. LM36923H Software Reset

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5.3 LM36923H Fault Flags
The contents of the LM36923H fault registers are read upon clicking the “Read” button. The registers are
cleared upon read back.
Figure 14. Fault Flags

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5.4 PWM Pin Control
The LM36923HEVM provides the user with the capability to control the PWM input without the need of an
external source. The PWM signal will be low until the "PWM Enable" button is clicked or whenever the
"Duty Cycle" value is set to 0. In order to change the PWM duty cycle the user can either type the desired
duty cycle in the "Duty Cycle" box or click on the up/down buttons associated with the numeric updown
box. The PWM frequency can be changed by selecting the desired setting via the Frequency drop-down
box.
Figure 15. PWM Input Pin Control

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5.5 ASEL Pin Control
The ASEL input to the LM36923HEVM is set via the GUI in the I2C options dialog. When unchecked ASEL
will be low and the I2C slave address used by the GUI is set to 0x36. When checked ASEL will be high
and the I2C slave address used by the GUI is set to 0x37. If the LM36923HEVM ASEL jumper is set to a
fixed setting the user will need to verify that the GUI Address Select setting matches the jumper on the
EVM.
Figure 16. ASEL Input Pin Control

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5.6 History & Macro Tab
The LM36923HEVM GUI provides history, register access and macro capability when the "History"
checkbox is checked. The history information can be cleared by clicking the "Clear" button or saved to file
by clicking the "Save to file ..." button. Clicking the "Save to file ..." button will open up a dialog box to
select the file location and file name.
Figure 17. GUI History following Read All button clicked

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5.7 Individual register read/write access
When the History & Macros tab is enabled the user can read or write to individual registers in the
LM36923H. Any read or write access is reflected in the history section in addition to the register box
located to the right of the "Read" and "Write" buttons.
Figure 18. Register read/write access

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5.8 Macro Example
The LM36923HEVM GUI provides the user with the ability to create custom macros to configure the
LM36923H with a single button click. Multiple macros can be created and saved in a single file as shown
in Figure 19.
Table 3. Macro commands
Macro command Macro function Syntax Description
rem Remark none Optional keyword, allows user to enter
comments which are not executed
RD read register two fields required, register hex
address and variable for return data Optional keyword, allows user to read any register, value appears in history section
WR write register two fields required, register hex
address and register hex data Optional keyword, allows user to write any
register, value written appears in history
section
MDLY millisecond delay one field, decimal delay Optional keyword. allows user to insert a
millisecond delay between commands
title macro title one field, macro title Required keyword to initiate macro, allows
user to set descriptive name to macro
end macro end all macro commands between "title"
and "end" included in macro Required keyword to terminate macro
OK pop up dialog box one field, text to appear in dialog
box Optional keyword, allows user prompt and halts macro execution until user response
Figure 19. Example macro