ALS-PDIC17-57B-TR8 Datasheet, PDF (5/19 Pages) Everlight Electronics Co., Ltd – Surface - Mount I2C Digital Ambient Light Sensor

Surface - Mount
I²C Digital Ambient Light Sensor
ALS-PDIC17-57B/TR8
Notes:
1.
2.
3.
Cb = capacitance of one bus line in pF
The maximum t_of for the I²C data and clock bus lines quoted in the AC table is longer
than the specified maximum t_of for the output stages (250nS). This allows series
protection resistors (R_S) to be connected between I²C data / clock pins and the I²C
≦ ^{data / clock bus lines without exceeding the maximum specified tof.}
The I²C bus operation voltage is 1.8V, The ALS-PDIC17-57B supply voltage must 3V
(3Vx0.6=1.8V)
AC Characteristics of I²C Signals in Standard and Fast Mode
Parameter
Symbol
I²C clock frequency
Hold time (repeated) START condition.
After this period, the first clock pulse is
generated.
Low period of I²C clock
High period of I²C clock
Set-up time for a repeated START
condition
Data hold time for I²C-bus devices
Data set-up time
Rise time of both I²C data and clock
signal’s
Fall time of both I²C data and clock
signal’s
Set-up time for STOP condition
Bus free time between STOP and
START condition
Capacitive load for each bus line
f_SCL
t_HD;STA
t_LOW
t_HIGH
t_SU;STA
t_HD;DAT
t_SU;DAT
t_r
t_f
t_SU;STO
t_BUF
C_b
Standard Mode
Min. Max.
0
100
4.0
4.7
4.0
4.7
0
3.45
250
-
-
1000
-
300
4.0
-
4.7
-
-
400
Fast Mode
Min. max.
0
400
0.6
-
1.3
0.6
0.6
0
0.9
100
-
5
300
0.1
300
0.6
-
1.3
-
-
400
Unit
KHz
us
us
us
us
us
ns
ns
ns
us
us
pF
Figure 2 I²C Timing Diagram
Everlight Electronics Co., Ltd.
Document No: DLS-00000xx Rev0.1
5
http://www.everlight.com
Jun. 22, 2011