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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LM36923HEVM User's Guide
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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LM36923HEVM User's Guide
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)