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NOA1302
Table 7. INTEGRATION TIME REGISTER
EC[2,1,0] Operation Integration Time
000 Normal mode of operation 400 ms
1. Send write command 0x1Dh to set EC[0] = 0.
2. Send write command 0x88h to set EC[1] = 1, now
EC[2:0] = 010.
001
010
011
100
101
110
111
Normal mode of operation
Normal mode of operation
Test mode
Simulation test mode use
only
Reserved for future use
Reserved for future use
Reserved for future use
200 ms (Default)
100 ms
16.7 ms
1.0 ms
Rise and Fall Time of SDA (Output)
Proper operation of the I 2 C bus depends on keeping the
bus capacitance low and selecting suitable pull ? up resistor
values. Figure 17 and Figure 18 show the rise and fall time
on SDA in output mode under maximum load conditions.
The measurement set ? up is shown in Figure 19. Figure 14
shows the maximum value of the pull ? up resistor (R P ) as a
function of the I 2 C data bus capacitance.
Programming Sequence and Command Summary
This section describes supported commands and
programming sequence. The NOA1302 only supports single
byte write and a single byte read I 2 C commands. Ambient
light intensity count is 16 bits wide, thus two I 2 C read
commands are needed.
Table 8 describes supported commands. All of these
commands have to be sent to the fixed address (0x39).
Table 8. DEVICE COMMANDS
Command Function
0x00h Start reading ADC data
0x03h Complete reading ADC data
R P = 1 k W
C L = 250 pF (including all parasitic caps)
t r = 530 ns
Figure 17. SDA Rise Time (t r )
0x1Dh
0x18h
0x43h
0x83h
0x88h
0x90h
Change EC[0] to 0
Reset EC[2:0] to default value (001)
Prepare ADC LS byte for reading
Prepare ADC MS byte for reading
Change EC[1] to 1
Change EC[2] to 1
Programming Sequence
To read 16 bits wide ambient light intensity count, the
following commands must be issued in sequence:
1. Send write command 0x00h to start the ADC
conversion cycle.
2. Send write command 0x03h to complete the ADC
cycle.
3. Send write command 0x43h to prepare the LS byte
for reading.
R P = 1 k W
C L = 250 pF (including all parasitic caps)
t f = 21 ns
Figure 18. SDA Fall Time (t f )
4. Send read byte command, returns LS byte of
count.
5. Send write command 0x83h to prepare the MS
byte for reading.
6. Send read byte command, returns MS byte of
count.
Pulse
Generator
LED
h n
NOA1302
ADC
16 ? bits
Control
I 2 C Serial
Interface
SCL
SDA
To change the integration time, for example to 100 ms, the
following commands must be used in sequence:
http://onsemi.com
8
Figure 19. Measurement Set ? up
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