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NOA1305CUTAG Datasheet(PDF) 8 Page - ON Semiconductor

Part # NOA1305CUTAG
Description  Ambient Light Sensor
Download  13 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NOA1305CUTAG Datasheet(HTML) 8 Page - ON Semiconductor

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NOA1305
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8
Figure 17 shows the most basic I2C read command
sequence sent by the master to the slave device. The
sequence consists of a complete I2C write command which
sets the address pointer in preparation for the I2C read
command since the read command itself does not include a
register address. When reading from a read only data register
in the NOA1305 it is acceptable to write a 0 to the register
in order to update the address pointer, but the 0 does not
actually over−write the value in the data register.
78
8
A[6:0]
D[7:0]
D[7:0]
WRITE ACK
ACK
ACK
Device
Address
Register
Address
Register
Data
Start
Condition
Condition
011 1001 0
0
00000000
0000 0110 00
0x72
78
8
A[6:0]
D[7:0]
D[7:0]
READ
ACK
ACK
NACK
Device
Address
Register
Data [A]
Register
Data [A+1]
Start
Condition
Stop
Condition
011 1001 1
0
bbbbbbbb
bbbbbbbb 01
0x73
Stop
D[7:0] ACK
D[7:0] ACK
Figure 17. I2C Read Command
Once the I2C write command is completed, the master
sends an I2C start sequence followed by the seven bit slave
address (NOA1305 = 0x39) and the read (1) command bit.
The NOA1305 will acknowledge this byte transfer with an
appropriate ACK. The NOA1305 will then begin shifting
out data from the register just addressed. If the master wishes
to receive more data (next register address), it will ACK the
slave at the end of the 8 bit data transmission, and the slave
will respond by sending the next byte, and so on. To signal
the end of the read transaction, the master will send a NACK
bit at the end of a transmission followed by an I2C STOP.
Rise and Fall Time of SDA (Output)
Proper operation of the I2C bus depends on keeping the
bus capacitance low and selecting suitable pull−up resistor
values. Figure 15 shows the fall time on SDA in output mode
under maximum load conditions. The measurement set−up
is shown in Figure 18. Figure 14 shows the maximum value
of the pull−up resistor (RP) as a function of the I2C data bus
capacitance.
NOA1305
LED
Pulse
Generator
ADC
SDA
SCL
16−bits
Control
INT
ADC
Control
Figure 18. Measurement Set−up
hn
I2C Serial
Interface


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