AN1476: ISL97635 SMBus LED Driver Programming Instruction

ISL97635 SMBus LED Driver Programming
Instruction
®
Application Note
1. Copy the ISL97635-20080614.zip file into hard drive,
then unzip it. Once the file is unzipped, run setup.exe
under the Package directory for s/w installation.
2. Connect the USB connector to the PC, or use USB
extension cable (not included).
3. Refer to “ISL97635EVALZ Evaluation Board Schematic”
on page 3.
4. Ensure JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9,
JP23, and JP26 are ON.
5. If the eval board does not have enough LED strings,
users can connect external LED strings between VOUT
(Anode) and IINx (Cathode) pins for the specific
configurations.
6. Apply 0.6V to 21V at VIN and PGND.
November 5, 2009
AN1476.0
8. Open the program at Start -> All Programs -> Intersil
ISL97635 Eval Kit -> Intersil IS635 Eval Kit. Click
ISL97636 instead (This is a programming error that will
be corrected in the next revision), the GUI is shown in
Figure 1.
9. To program ISL97635 GUI, enter the data in Hex (0x00 to
0xFF) in registers 0x00 and 0x07. Other registers enter
binary data. One example for checking the Backlight
Control is to change bit 0 in register 0x01 to 1, then click
the Write button. The LEDs should be on. Table 1 shows
the Register map. For the complete command and data
descriptions, see ISL97635 Table 2A and the associated
sections.
(Note: Sometimes the USB driver needs to be reset; for
normal operation, just cycle the VIN power).
7. Apply 0.2V to 5.5V at PWMI/EN and GND. Optional PWM
signal can be applied to the same pin for PWM dimming.
FIGURE 1. ISL97635 GUI
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1476
TABLE 1. REGISTER MAP
ADDRESS
REGISTER
BIT 7
BIT 6
BRT6
BIT 5
BRT5
BIT 4
0x00
PWM
Brightness
Control
BRT7
0x01
Device
Control
Reserved Reserved Reserved Reserved
0x02
Fault/Status
Reserved Reserved 2_CH_SD 1_CH_SD BL_STAT
0x03
Identification
LED
Panel
MFG3
0x07
DC
Brightness
Control
BRTDC7
BRTDC6 BRTDC5
BIT 2
BIT 1
BIT 0
DEFAULT
SMBUS
VALUE PROTOCOL
BRT3
BRT2
BRT1
BRT0
0XFF
Read and
Write
Reserved
PWM_MD
PWM_SEL
BL_cTL
0X00
Read and
Write
OV_CURR THRM_SHDN FAULT
0x00
Read Only
MFG1
MFG0
REV2
REV1
REV0
0xC8
Read Only
BRTDC4
BRTDC3
BRTDC2
BRTDC1
BRTDC0
0xFF
Read and
Write
0x08
Configuration Reserved Reserved Reserved Reserved
Reserved
FSW
VSC1
VSC0
0xXF
Read and
Write
0x09
Output
Channel
CH3
CH2
CH1
CH0
0xFF
Read and
Write
CH 7
CH6
MFG2
BRT4
BIT 3
CH5
CH4
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to
verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
2
AN1476.0
November 5, 2009
ISL97635EVALZ Evaluation Board Schematic
Notes
L1 choices :
1st - IHLP-2525BD-01 Vishay Inductor,8.2uH/3A/2.4mm
2nd- RLF7030TDKInductor 6.8uH/2.8A/3.2mm
3rd- IHLP-2525AH-01 Vishay Inductor, 4.7uH/3A/1.8mm (LowestProfile)
TP28
TP27
D1choices:
1st - SS15 - Vishay Schottky Diode, 50V/1A/SMA/2.3mm
2nd- ZHCS500 - Zetex Schottky Diode, 40V/0.5A/SOT-23/1mm
J4
JP23
4
3
2
1
(C19 & C20 not populated)
J1
J6
3
C15
47uF
SGND
(D2& C21 not populated)
C16
0.1uF
C1
4
C21
R1
open
3
open
D1
TP9
JP8
L1
1
2
5
6
D2
C2
10u/25V 0.1u/25V
PGND
TP10
Q1
VIN
VIN
USBCON
C4
C5
8.2uH
VOUT
C6
C7
C8
C9
4.7u/50V 4.7u/50V 4.7u/50V 4.7u/50V
SS15
JP1
JP2
JP3
JP4
JP5
JP6
JP7
FDMA530PZ
SGNDC17
10u/25V
R12
2.49
R13
2.49
Q2
U2
Q3
10u/25V
U3
XT1
33pF
C18
TP11
1.5k
Vlogic
TP25
JP28
SGNDR14
100
R6
C10
R7
500
20n/50V
JP26
R5
C11 C12
1u/50V 0.1u/16V
10k
TP12
JP27
R3
270k
19L X
10k
JP9
R10
20LX
SGND
TP26
JP29
UMT1N
LED1
LED10
JP10
R15
1
SMBCLK
PGND
SMBDAT
PGND
C13
27nF/50V
C14
220nF/50V
ST7263B
3
FPWM
4
LED2
16
ISL97635
PWMO
IIN0
GND
IIN1
PWMI/EN
IIN2
15
5
JP14
LED46
JP15
LED55
JP16
LED64
LED73
JP17
JP18
LED11
LED20
LED29
LED38
LED47
LED56
LED65
LED74
LED3
LED12
LED21
LED30
LED39
LED48
LED57
LED66
LED75
LED4
LED13
LED22
LED31
LED40
LED49
LED58
LED67
LED76
LED5
LED14
LED23
LED32
LED41
LED50
LED59
LED68
LED77
LED6
JP19
LED15
LED24
LED33
LED42
LED51
LED60
LED69
LED78
LED7
JP20
LED16
LED25
LED34
LED43
LED52
LED61
LED70
LED79
LED8
JP21
LED17
LED26
LED35
LED44
LED53
LED62
LED71
LED80
LED18
LED27
LED36
LED45
LED54
LED63
LED72
LED81
R4
10k
J3
SGND
JP13
LED37
17
OVP
TP21
JP12
LED28
18
100
2
TP22
JP11
LED19
14
J2
PWMI/EN
6
13
1
3
5
7
9
IIN312
RSET
11
IIN410
IIN5 9
IIN68
U1
IIN77
SGND
J5
HE10_CON_MALE
2
4
6
8
10
JP24
SGND
R2
34.8K
Connectone point at PCB
LED9
JP22
SGND
TP1
TP2
TP3
TP4
R11
4
TP5
TP6
TP7
TP8
FIGURE 2. EVALUATION BOARD SCHEMATIC
Application Note 1476
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
COM
22 P
R9
SGND
SGND
VDDA
USBVCC
USBDM
USBDP
VSSA
PA0/MCO
PA1/SDA/ICCDATA
NC
NC
NC
PA2/SCL/ICCCLK
PA3/EXTCLK
PA4/ICAP1/IT1
PA5/ICAP2/IT2
PA6/OCMP1/IT3
PA7/OCMP2/IT4
PB0/AIN0
V DC
24
C20
0.1uF
33pF
VDD
OSCOUT
OSCIN
VSS
PC2/USBOE
PC1/TDO
PC0/RDI
/RESET
NC
PB7/AIN7/IT8
PB6/AIN6/IT7
VPP/TEST
PB5/AIN5/IT6
PB4/AIN4/IT5
PB3/AIN3
PB2/AIN2
PB1/AIN1
V IN
23
SGND
R8
4.7k
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
FAULTFAULT
21
OSC
C19
0.1uF
AN1476.0
November 5, 2009
LED Driver Circuit
VIN
Q1
4
C2
0.1µ/25V
C1
10µ/25V
3
D1
L1
1
2
5
6
8.2µH
C4
10µ/25V
L1 : IHLP-2525BD-01 Vishay Inductor
D1 : SS15 - Vishay Schottky Diode, 5
C6
4.7µ/50V
SS15
C7
4.7µ/50V
FDMA530PZ
SMBDAT
2
SMBDAT
3
FPWM
27n/6.3V
220n/6.3V
C13
C14 4
SMBCLK
19
PGND
18
PGND
17
OVP
16
ISL97635
PWMO
R3
1M
IIN0
15
6
PWMI/EN
IIN2
13
OVP
IIN3
R4
39k
12
11
10
9
8
RSET
PWMI/EN
IIN4
14
IIN5
IIN1
NC
GND
NC
5
7
LED10
LED19
LED28
LED37
LED46
LED2
LED11
LED20
LED29
LED38
LED47
LED3
LED12
LED21
LED30
LED39
LED48
LED4
LED13
LED22
LED31
LED40
LED49
LED5
LED14
LED23
LED32
LED41
LED50
LED6
LED15
LED24
LED33
LED42
LED51
R2
36.6k
LED7
LED16
LED25
LED34
LED43
LED52
LED8
LED17
LED26
LED35
LED44
LED53
LED9
LED18
LED27
LED36
LED45
LED54
NOTES:
1. For two layer board, layout PGND (Noisy Ground) Top Layer and AGND (Quiet Ground) on Bottom Layer.
2. Tie PGND and AGND at one point only by doing the following: Bridge U1 PGND (Pins 18 and 19) and AGND (Pin 5)
to the package thermal pad.
3. Put multiple vias on the thermal pad that connects to the bottom side AGND.
AN1476.0
November 5, 2009
FIGURE 3. LED DRIVER CIRCUIT
Application Note 1476
GND
U1
LED1
LX
FAULT 21
20
LX
1
COMP
SMBCLK
VIN
VDC
4
C11
1µ/10V
23
C12
0.1µ/10V
R5
10k
24
R6
10k
22
C10
33n
R7
500
JP26
VLOGIC
C20
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