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ISL29120
Register Set
There are eight registers that are available in the ISL29120. Table 1 summarizes their functions.
TABLE 1. REGISTER SET
BIT
ADDR
00h
01h
02h
03h
04h
05h
06h
07h
REG NAME
COMMANDI
COMMANDII
DATA LSB
DATA MSB
INT_LT_LSB
INT_LT_MSB
INT_HT_LSB
INT_HT_MSB
7
OP2
0
D7
D15
TL7
TL15
TH7
TH15
6
OP1
0
D6
D14
TL6
TL14
TH6
TH14
5
OP0
0
D5
D13
TL5
TL13
TH5
TH13
4
0
0
D4
D12
TL4
TL12
TH4
TH12
3
0
RES1
D3
D11
TL3
TL11
TH3
TH11
2
IFLG
RES0
D2
D10
TL2
TL10
TH2
TH10
1
PRST1
0
D1
D9
TL1
TL9
TH1
TH9
0
PRST0
RANGE
D0
D8
TL0
TL8
TH0
TH8
DEFAULT
00h
00h
00h
00h
00h
00h
FFh
FFh
Command Register I 0x00
The first command register has the following functions:
Operation Mode: Bits[7:5]. These three bits determine the
operation mode of the device.
Interrupt persist: Bits[1:0]. The interrupt pin and the interrupt flag
are triggered/set when the data sensor reading is out of the
interrupt threshold window after m consecutive data conversion
cycles. The interrupt persist bits determine m.
TABLE 4. INTERRUPT PERSISTENCE
TABLE 2. OPERATION MODE
0x00[1:0]
NUMBER OF DATA CONVERSION CYCLES
0x00[7:5]
000
001
010
Power-down
Red Sensor once
Blue Sensor once
OPERATION
00
01
10
11
1
4
8
16
011
100
101
110
111
Green Sensor once
Reserved
Red Sensor continuous
Blue Sensor continuous
Green Sensor continuous
Command Register II 0x01
The second command register has the following functions:
Resolution: Bits[3:2] determine the ADC’s resolution and the
integration time. The integration time is the period the device’s
analog-to-digital (A/D) converter samples the photodiode current
for a measurement.
Interrupt flag: Bit[2]. This is the interrupt status bit. The bit is set
high when the interrupt thresholds have been triggered. Once
TABLE 5. ADC RESOLUTION DATA WIDTH
INTEGRATION TIME
triggered, the INT pin stays low and the status bit stays high. Both
the interrupt pin and the status bit are cleared at the end of
Command Register I read.
TABLE 3. INTERRUPT FLAG
0x01[3:2]
00
01
10
(ms)
90
5.6
0.35
RESOLUTION
16 Bits
12 Bits
8 Bits
0x00[2]
OPERATION
11
0.022
4 Bits
0
No Interrupt event
1
Interrupt event triggered
1. Range 0x01[0]: The Full Scale Optical Range (FSOR). Optical
sensitivity for the ‘Low’ range is 4.75 times the optical
sensitivity in ‘High’ range.
TABLE 6. RANGE
5
0x01[0]
0
1
FSR
Low
High
FN8314.0
May 29, 2012
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