AS3661 datasheet(11/87 Pages) AMSCO

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AS3661

Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s

Figure 3. I

2C mode Timing Diagram

3. Output current accuracy is the difference between actual value of the output current and programmed value of

this current. IMATCH is determined as follows:

For the constant current D1 to D9, the following are determined: The maximum current (max) and the minimum

current (min), then the IMATCH is calculated with: IMATCH = 100*(((max-min)/2)+((max+min)/2))/((max+min)/2)-

100

4. Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured

at VCP - 1V.

5. Total unadjusted error includes offset, full-scale and linearity errors.

6. The I2C host should allow at least 500µs before sending data the AS3661after the rising edge of the enable

line.

Table 4. Electrical Characteristics I

Symbol

Parameter

Condition

Min

Typ

Max

Unit

2C mode timings - see Figure 3 on page 10

fSCLK

SCL Clock Frequency

400

kHz

tBUF

Bus Free Time

Between a STOP and

START Condition

1.3

µs

tHD:STA

Hold Time (Repeated)

START Condition

0.6

µs

tLOW

LOW Period of SCL

Clock

1.3

µs

tHIGH

HIGH Period of SCL

Clock

0.6

µs

SCL

SDA

tBUF

tHD:STA

tSU:STA

REPEATED

START

tSU:STO

tSU:DAT

tHIGH

tHD:DAT

tLOW

tHD:STA

START

STOP

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