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AS3661-BWLT Datasheet(PDF) 11 Page - ams AG |
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AS3661-BWLT Datasheet(HTML) 11 Page - ams AG |
11 / 87 page www.austriamicrosystems.com Revision 1.3 10 - 85 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 2 C 1 Symbol Parameter Condition Min Typ Max Unit I 2C mode timings - see Figure 3 on page 10 fSCLK SCL Clock Frequency 0 400 kHz tBUF Bus Free Time Between a STOP and START Condition 1.3 µs tHD:STA Hold Time (Repeated) START Condition 2 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 tF tSU:DAT tHIGH tHD:DAT tR tLOW tHD:STA START STOP |
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