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AS3642 데이터시트(PDF) 7 Page - ams AG

부품명 AS3642
상세설명  Ultra Small 500mA Inductive White LED Flash Driver
PDF  27 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS3642 데이터시트(HTML) 7 Page - ams AG

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AS3642
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
Timing Diagrams
Figure 3. I
2C interface Timing Diagram
CI/O
I/O Capacitance
(SDA, SCL)
10
pF
1. Limited to max. 5V due to overvoltage protection circuit on pin VOUT
2. Due to slope compensation of the current limit, ILIMIT changes with duty cycle - see Figure 16 on page 9.
3. Due to the architecture (the supply of the AS3642 is connected to the output VOUT), the undervoltage lockout
is only detected when the DCDC converter is not switching
4. The logic input levels VIH and VIL allow for 1.8V supplied driving circuit (70%/30% of 1.8V)
5. After this period, the first clock pulse is generated.
6. A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIHMIN of the
SCL signal) to bridge the undefined region of the falling edge of SCL.
7. A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT = to 250ns must then
be met. This is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a
device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line tR max +
tSU:DAT = 1000 + 250 = 1250ns before the SCL line is released.
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min
Typ
Max
Unit
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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