ISL97632IRT26Z-TK Intersil, ISL97632IRT26Z-TK Datasheet - Page 4

• Manufacturer Part Number: ISL97632IRT26Z-TK
• Description: IC LED DRIVR WHITE BCKLGT 8-TDFN
• Manufacturer: Intersil
• Type: Backlight, White LEDr

Specifications of ISL97632IRT26Z-TK

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: White LED
• Frequency: 1.3MHz ~ 1.6MHz
• Voltage - Supply: 2.4 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Efficiency: 86%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: ISL97632IRT26Z-TK

Single-Wire Serial Interface
The ISL97632 uses a simple single-wire serial interface for
programming the output brightness of the LEDs. A 5-bit
interface is used to give a total of 32 levels of output
brightness. The interface uses a normally high connection
for use with open-drain driving schemes and Intersil’s
proprietary 1-Wire XSD bus. When held low for between
15µs and 45µs, the interface registers a logic 1. When held
low for between 90µs and 120µs the interface registers a
logic 0. When held low for greater that 215µs, the interface
loads the last 5 bits into the brightness control register and
updates the brightness level. The required minimum high
time is 3µs. This simple single-wire programming is
summarized as follows:
• Logic 0 = Negative pulse >90µs and <120µs
• Logic 1 = Negative pulse >15µs and <45µs
• Load = Negative pulse >215µs
Figure 1 shows an example of programming a binary code of
10100 and load it in to the device serial register.
The serial interface is automatically reset to 0 when the
device is disabled, or enters UVLO. Therefore, when the part
is enabled, the output brightness is automatically set to the
minimum level.
30µs
0
'1'
4
200
'0'
FIGURE 1. 1-WIRE XSD INTERFACE
400
'1'
ISL97632
600
100µs
'0'
800
'0'
1000
'LOAD'
220µs
1200
µs
March 22, 2010
FN9239.3