isl97635 Intersil Corporation, isl97635 Datasheet - Page 10

• Manufacturer Part Number: isl97635
• Description: Smbus 8-channel Led Driver
• Manufacturer: Intersil Corporation

Pinout
Pin Descriptions
17, 18
19, 20
PIN
10
12
13
14
15
16
21
11
1
2
3
4
5
6
7
8
9
PWMI/EN
SMBCLK
SMBDAT
PWMO
FPWM
NAME
FAULT
PGND
RSET
GND
OVP
IIN7
IIN6
IIN5
IIN4
IIN3
IIN2
IIN1
IIN0
LX
(I = Input, O = Output, S = Supply)
10
TYPE
I/O
I/O
O
S
S
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Dual Functions: Enable pin and PWM brightness control pin or DPST control input. DO NOT let
Resistor connection for setting LED current, (see Equation 1 for calculating the I
Overvoltage protection input
Power ground (LX Power return)
SMBus serial clock input
SMBus serial data input and output
Connect a capacitor between FPWM and GND to set the DPWM frequency. FPWM = 5.4µ/C
If SMBus PWM or DPST mode is used, connect C
connect C
connect C
PWMI buffered output. If one connects a capacitor between PWMO and GND, it forms a low pass filter
with an internal 40kΩ resistor, which filters the PWMI signal for DPST operation when Reg 0x01 = 0x01.
If one applies a 0.2V to 1.2V DC input voltage, the output will be PWM with duty cycle proportional to the
DC input.
Analog GND and LED power return
PWMI/EN floating. The device needs 4ms for initial power-up Enable, then this pin can be applied with
a PWM signal with off-time no longer than 28ms.
Input 7 to current source, FB, and monitoring
Input 6 to current source, FB, and monitoring
Input 5 to current source, FB, and monitoring
Input 4 to current source, FB, and monitoring
Input 3 to current source, FB, and monitoring
Input 2 to current source, FB, and monitoring
Input 1 to current source, FB, and monitoring
Input 0 to current source, FB, and monitoring
Input to boost switch
Fault disconnect switch
PWMI/EN
SMBCLK
SMBDAT
PWMO
FPWM
GND
PWMO
FPWM
1
2
3
4
5
6
24
to set the dimming frequency and apply a 0.21V to 1.21V at V
7
between V
ISL97635
23
8
(24 LD QFN)
TOP VIEW
ISL97635
22
9
PWMO
21
10
and GND pins for DPST operation. If DC-to-PWM mode is used,
11
20
12
19
DESCRIPTION
18
17
16
15
14
13
PGND
PGND
OVP
IIN0
IIN1
IIN2
FPWM
to GND to set the dimming frequency. Also,
PWMO
LEDmax
.
December 22, 2008
)
FPWM
FN6434.2